summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/bridge/ti-sn65dsi86.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/gpu/drm/bridge/ti-sn65dsi86.c')
-rw-r--r--drivers/gpu/drm/bridge/ti-sn65dsi86.c529
1 files changed, 356 insertions, 173 deletions
diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index 3c3561942eb6..276d05d25ad8 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -21,7 +21,7 @@
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
-#include <asm/unaligned.h>
+#include <linux/unaligned.h>
#include <drm/display/drm_dp_aux_bus.h>
#include <drm/display/drm_dp_helper.h>
@@ -32,10 +32,10 @@
#include <drm/drm_edid.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_of.h>
-#include <drm/drm_panel.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>
+#define SN_DEVICE_ID_REGS 0x00 /* up to 0x07 */
#define SN_DEVICE_REV_REG 0x08
#define SN_DPPLL_SRC_REG 0x0A
#define DPPLL_CLK_SRC_DSICLK BIT(0)
@@ -106,10 +106,21 @@
#define SN_PWM_EN_INV_REG 0xA5
#define SN_PWM_INV_MASK BIT(0)
#define SN_PWM_EN_MASK BIT(1)
+
+#define SN_IRQ_EN_REG 0xE0
+#define IRQ_EN BIT(0)
+
+#define SN_IRQ_EVENTS_EN_REG 0xE6
+#define HPD_INSERTION_EN BIT(1)
+#define HPD_REMOVAL_EN BIT(2)
+
#define SN_AUX_CMD_STATUS_REG 0xF4
#define AUX_IRQ_STATUS_AUX_RPLY_TOUT BIT(3)
#define AUX_IRQ_STATUS_AUX_SHORT BIT(5)
#define AUX_IRQ_STATUS_NAT_I2C_FAIL BIT(6)
+#define SN_IRQ_STATUS_REG 0xF5
+#define HPD_REMOVAL_STATUS BIT(2)
+#define HPD_INSERTION_STATUS BIT(1)
#define MIN_DSI_CLK_FREQ_MHZ 40
@@ -152,7 +163,9 @@
* @ln_assign: Value to program to the LN_ASSIGN register.
* @ln_polrs: Value for the 4-bit LN_POLRS field of SN_ENH_FRAME_REG.
* @comms_enabled: If true then communication over the aux channel is enabled.
+ * @hpd_enabled: If true then HPD events are enabled.
* @comms_mutex: Protects modification of comms_enabled.
+ * @hpd_mutex: Protects modification of hpd_enabled.
*
* @gchip: If we expose our GPIOs, this is used.
* @gchip_output: A cache of whether we've set GPIOs to output. This
@@ -170,10 +183,10 @@
* @pwm_refclk_freq: Cache for the reference clock input to the PWM.
*/
struct ti_sn65dsi86 {
- struct auxiliary_device bridge_aux;
- struct auxiliary_device gpio_aux;
- struct auxiliary_device aux_aux;
- struct auxiliary_device pwm_aux;
+ struct auxiliary_device *bridge_aux;
+ struct auxiliary_device *gpio_aux;
+ struct auxiliary_device *aux_aux;
+ struct auxiliary_device *pwm_aux;
struct device *dev;
struct regmap *regmap;
@@ -190,14 +203,16 @@ struct ti_sn65dsi86 {
u8 ln_assign;
u8 ln_polrs;
bool comms_enabled;
+ bool hpd_enabled;
struct mutex comms_mutex;
+ struct mutex hpd_mutex;
#if defined(CONFIG_OF_GPIO)
struct gpio_chip gchip;
DECLARE_BITMAP(gchip_output, SN_NUM_GPIOS);
#endif
-#if defined(CONFIG_PWM)
- struct pwm_chip pchip;
+#if IS_REACHABLE(CONFIG_PWM)
+ struct pwm_chip *pchip;
bool pwm_enabled;
atomic_t pwm_pin_busy;
#endif
@@ -221,6 +236,23 @@ static const struct regmap_config ti_sn65dsi86_regmap_config = {
.max_register = 0xFF,
};
+static int ti_sn65dsi86_read_u8(struct ti_sn65dsi86 *pdata, unsigned int reg,
+ u8 *val)
+{
+ int ret;
+ unsigned int reg_val;
+
+ ret = regmap_read(pdata->regmap, reg, &reg_val);
+ if (ret) {
+ dev_err(pdata->dev, "fail to read raw reg %#x: %d\n",
+ reg, ret);
+ return ret;
+ }
+ *val = (u8)reg_val;
+
+ return 0;
+}
+
static int __maybe_unused ti_sn65dsi86_read_u16(struct ti_sn65dsi86 *pdata,
unsigned int reg, u16 *val)
{
@@ -244,11 +276,26 @@ static void ti_sn65dsi86_write_u16(struct ti_sn65dsi86 *pdata,
regmap_bulk_write(pdata->regmap, reg, buf, ARRAY_SIZE(buf));
}
-static u32 ti_sn_bridge_get_dsi_freq(struct ti_sn65dsi86 *pdata)
+static struct drm_display_mode *
+get_new_adjusted_display_mode(struct drm_bridge *bridge,
+ struct drm_atomic_state *state)
+{
+ struct drm_connector *connector =
+ drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
+ struct drm_connector_state *conn_state =
+ drm_atomic_get_new_connector_state(state, connector);
+ struct drm_crtc_state *crtc_state =
+ drm_atomic_get_new_crtc_state(state, conn_state->crtc);
+
+ return &crtc_state->adjusted_mode;
+}
+
+static u32 ti_sn_bridge_get_dsi_freq(struct ti_sn65dsi86 *pdata,
+ struct drm_atomic_state *state)
{
u32 bit_rate_khz, clk_freq_khz;
struct drm_display_mode *mode =
- &pdata->bridge.encoder->crtc->state->adjusted_mode;
+ get_new_adjusted_display_mode(&pdata->bridge, state);
bit_rate_khz = mode->clock *
mipi_dsi_pixel_format_to_bpp(pdata->dsi->format);
@@ -275,7 +322,8 @@ static const u32 ti_sn_bridge_dsiclk_lut[] = {
460800000,
};
-static void ti_sn_bridge_set_refclk_freq(struct ti_sn65dsi86 *pdata)
+static void ti_sn_bridge_set_refclk_freq(struct ti_sn65dsi86 *pdata,
+ struct drm_atomic_state *state)
{
int i;
u32 refclk_rate;
@@ -288,7 +336,7 @@ static void ti_sn_bridge_set_refclk_freq(struct ti_sn65dsi86 *pdata)
refclk_lut_size = ARRAY_SIZE(ti_sn_bridge_refclk_lut);
clk_prepare_enable(pdata->refclk);
} else {
- refclk_rate = ti_sn_bridge_get_dsi_freq(pdata) * 1000;
+ refclk_rate = ti_sn_bridge_get_dsi_freq(pdata, state) * 1000;
refclk_lut = ti_sn_bridge_dsiclk_lut;
refclk_lut_size = ARRAY_SIZE(ti_sn_bridge_dsiclk_lut);
}
@@ -298,6 +346,10 @@ static void ti_sn_bridge_set_refclk_freq(struct ti_sn65dsi86 *pdata)
if (refclk_lut[i] == refclk_rate)
break;
+ /* avoid buffer overflow and "1" is the default rate in the datasheet. */
+ if (i >= refclk_lut_size)
+ i = 1;
+
regmap_update_bits(pdata->regmap, SN_DPPLL_SRC_REG, REFCLK_FREQ_MASK,
REFCLK_FREQ(i));
@@ -308,12 +360,13 @@ static void ti_sn_bridge_set_refclk_freq(struct ti_sn65dsi86 *pdata)
pdata->pwm_refclk_freq = ti_sn_bridge_refclk_lut[i];
}
-static void ti_sn65dsi86_enable_comms(struct ti_sn65dsi86 *pdata)
+static void ti_sn65dsi86_enable_comms(struct ti_sn65dsi86 *pdata,
+ struct drm_atomic_state *state)
{
mutex_lock(&pdata->comms_mutex);
/* configure bridge ref_clk */
- ti_sn_bridge_set_refclk_freq(pdata);
+ ti_sn_bridge_set_refclk_freq(pdata, state);
/*
* HPD on this bridge chip is a bit useless. This is an eDP bridge
@@ -327,12 +380,18 @@ static void ti_sn65dsi86_enable_comms(struct ti_sn65dsi86 *pdata)
* 200 ms. We'll assume that the panel driver will have the hardcoded
* delay in its prepare and always disable HPD.
*
- * If HPD somehow makes sense on some future panel we'll have to
- * change this to be conditional on someone specifying that HPD should
- * be used.
+ * For DisplayPort bridge type, we need HPD. So we use the bridge type
+ * to conditionally disable HPD.
+ * NOTE: The bridge type is set in ti_sn_bridge_probe() but enable_comms()
+ * can be called before. So for DisplayPort, HPD will be enabled once
+ * bridge type is set. We are using bridge type instead of "no-hpd"
+ * property because it is not used properly in devicetree description
+ * and hence is unreliable.
*/
- regmap_update_bits(pdata->regmap, SN_HPD_DISABLE_REG, HPD_DISABLE,
- HPD_DISABLE);
+
+ if (pdata->bridge.type != DRM_MODE_CONNECTOR_DisplayPort)
+ regmap_update_bits(pdata->regmap, SN_HPD_DISABLE_REG, HPD_DISABLE,
+ HPD_DISABLE);
pdata->comms_enabled = true;
@@ -352,6 +411,7 @@ static void ti_sn65dsi86_disable_comms(struct ti_sn65dsi86 *pdata)
static int __maybe_unused ti_sn65dsi86_resume(struct device *dev)
{
struct ti_sn65dsi86 *pdata = dev_get_drvdata(dev);
+ const struct i2c_client *client = to_i2c_client(pdata->dev);
int ret;
ret = regulator_bulk_enable(SN_REGULATOR_SUPPLY_NUM, pdata->supplies);
@@ -363,7 +423,18 @@ static int __maybe_unused ti_sn65dsi86_resume(struct device *dev)
/* td2: min 100 us after regulators before enabling the GPIO */
usleep_range(100, 110);
- gpiod_set_value(pdata->enable_gpio, 1);
+ gpiod_set_value_cansleep(pdata->enable_gpio, 1);
+
+ /*
+ * After EN is deasserted and an external clock is detected, the bridge
+ * will sample GPIO3:1 to determine its frequency. The driver will
+ * overwrite this setting in ti_sn_bridge_set_refclk_freq(). But this is
+ * racy. Thus we have to wait a couple of us. According to the datasheet
+ * the GPIO lines has to be stable at least 5 us (td5) but it seems that
+ * is not enough and the refclk frequency value is still lost or
+ * overwritten by the bridge itself. Waiting for 20us seems to work.
+ */
+ usleep_range(20, 30);
/*
* If we have a reference clock we can enable communication w/ the
@@ -373,7 +444,14 @@ static int __maybe_unused ti_sn65dsi86_resume(struct device *dev)
* clock so reading early doesn't work.
*/
if (pdata->refclk)
- ti_sn65dsi86_enable_comms(pdata);
+ ti_sn65dsi86_enable_comms(pdata, NULL);
+
+ if (client->irq) {
+ ret = regmap_update_bits(pdata->regmap, SN_IRQ_EN_REG, IRQ_EN,
+ IRQ_EN);
+ if (ret)
+ dev_err(pdata->dev, "Failed to enable IRQ events: %d\n", ret);
+ }
return ret;
}
@@ -386,7 +464,7 @@ static int __maybe_unused ti_sn65dsi86_suspend(struct device *dev)
if (pdata->refclk)
ti_sn65dsi86_disable_comms(pdata);
- gpiod_set_value(pdata->enable_gpio, 0);
+ gpiod_set_value_cansleep(pdata->enable_gpio, 0);
ret = regulator_bulk_disable(SN_REGULATOR_SUPPLY_NUM, pdata->supplies);
if (ret)
@@ -420,81 +498,29 @@ static int status_show(struct seq_file *s, void *data)
return 0;
}
-
DEFINE_SHOW_ATTRIBUTE(status);
-static void ti_sn65dsi86_debugfs_remove(void *data)
-{
- debugfs_remove_recursive(data);
-}
-
-static void ti_sn65dsi86_debugfs_init(struct ti_sn65dsi86 *pdata)
-{
- struct device *dev = pdata->dev;
- struct dentry *debugfs;
- int ret;
-
- debugfs = debugfs_create_dir(dev_name(dev), NULL);
-
- /*
- * We might get an error back if debugfs wasn't enabled in the kernel
- * so let's just silently return upon failure.
- */
- if (IS_ERR_OR_NULL(debugfs))
- return;
-
- ret = devm_add_action_or_reset(dev, ti_sn65dsi86_debugfs_remove, debugfs);
- if (ret)
- return;
-
- debugfs_create_file("status", 0600, debugfs, pdata, &status_fops);
-}
-
/* -----------------------------------------------------------------------------
* Auxiliary Devices (*not* AUX)
*/
-static void ti_sn65dsi86_uninit_aux(void *data)
-{
- auxiliary_device_uninit(data);
-}
-
-static void ti_sn65dsi86_delete_aux(void *data)
-{
- auxiliary_device_delete(data);
-}
-
-/*
- * AUX bus docs say that a non-NULL release is mandatory, but it makes no
- * sense for the model used here where all of the aux devices are allocated
- * in the single shared structure. We'll use this noop as a workaround.
- */
-static void ti_sn65dsi86_noop(struct device *dev) {}
-
static int ti_sn65dsi86_add_aux_device(struct ti_sn65dsi86 *pdata,
- struct auxiliary_device *aux,
+ struct auxiliary_device **aux_out,
const char *name)
{
struct device *dev = pdata->dev;
- int ret;
-
- aux->name = name;
- aux->dev.parent = dev;
- aux->dev.release = ti_sn65dsi86_noop;
- device_set_of_node_from_dev(&aux->dev, dev);
- ret = auxiliary_device_init(aux);
- if (ret)
- return ret;
- ret = devm_add_action_or_reset(dev, ti_sn65dsi86_uninit_aux, aux);
- if (ret)
- return ret;
-
- ret = auxiliary_device_add(aux);
- if (ret)
- return ret;
- ret = devm_add_action_or_reset(dev, ti_sn65dsi86_delete_aux, aux);
+ const struct i2c_client *client = to_i2c_client(dev);
+ struct auxiliary_device *aux;
+ int id;
+
+ id = (client->adapter->nr << 10) | client->addr;
+ aux = __devm_auxiliary_device_create(dev, KBUILD_MODNAME, name,
+ NULL, id);
+ if (!aux)
+ return -ENODEV;
- return ret;
+ *aux_out = aux;
+ return 0;
}
/* -----------------------------------------------------------------------------
@@ -514,6 +540,7 @@ static ssize_t ti_sn_aux_transfer(struct drm_dp_aux *aux,
u32 request_val = AUX_CMD_REQ(msg->request);
u8 *buf = msg->buffer;
unsigned int len = msg->size;
+ unsigned int short_len;
unsigned int val;
int ret;
u8 addr_len[SN_AUX_LENGTH_REG + 1 - SN_AUX_ADDR_19_16_REG];
@@ -587,7 +614,8 @@ static ssize_t ti_sn_aux_transfer(struct drm_dp_aux *aux,
}
if (val & AUX_IRQ_STATUS_AUX_SHORT) {
- ret = regmap_read(pdata->regmap, SN_AUX_LENGTH_REG, &len);
+ ret = regmap_read(pdata->regmap, SN_AUX_LENGTH_REG, &short_len);
+ len = min(len, short_len);
if (ret)
goto exit;
} else if (val & AUX_IRQ_STATUS_NAT_I2C_FAIL) {
@@ -618,6 +646,24 @@ exit:
return len;
}
+static int ti_sn_aux_wait_hpd_asserted(struct drm_dp_aux *aux, unsigned long wait_us)
+{
+ /*
+ * The HPD in this chip is a bit useless (See comment in
+ * ti_sn65dsi86_enable_comms) so if our driver is expected to wait
+ * for HPD, we just assume it's asserted after the wait_us delay.
+ *
+ * In case we are asked to wait forever (wait_us=0) take conservative
+ * 500ms delay.
+ */
+ if (wait_us == 0)
+ wait_us = 500000;
+
+ usleep_range(wait_us, wait_us + 1000);
+
+ return 0;
+}
+
static int ti_sn_aux_probe(struct auxiliary_device *adev,
const struct auxiliary_device_id *id)
{
@@ -627,6 +673,7 @@ static int ti_sn_aux_probe(struct auxiliary_device *adev,
pdata->aux.name = "ti-sn65dsi86-aux";
pdata->aux.dev = &adev->dev;
pdata->aux.transfer = ti_sn_aux_transfer;
+ pdata->aux.wait_hpd_asserted = ti_sn_aux_wait_hpd_asserted;
drm_dp_aux_init(&pdata->aux);
ret = devm_of_dp_aux_populate_ep_devices(&pdata->aux);
@@ -660,7 +707,7 @@ static struct ti_sn65dsi86 *bridge_to_ti_sn65dsi86(struct drm_bridge *bridge)
return container_of(bridge, struct ti_sn65dsi86, bridge);
}
-static int ti_sn_attach_host(struct ti_sn65dsi86 *pdata)
+static int ti_sn_attach_host(struct auxiliary_device *adev, struct ti_sn65dsi86 *pdata)
{
int val;
struct mipi_dsi_host *host;
@@ -675,7 +722,7 @@ static int ti_sn_attach_host(struct ti_sn65dsi86 *pdata)
if (!host)
return -EPROBE_DEFER;
- dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
+ dsi = devm_mipi_dsi_device_register_full(&adev->dev, host, &info);
if (IS_ERR(dsi))
return PTR_ERR(dsi);
@@ -693,10 +740,11 @@ static int ti_sn_attach_host(struct ti_sn65dsi86 *pdata)
pdata->dsi = dsi;
- return devm_mipi_dsi_attach(dev, dsi);
+ return devm_mipi_dsi_attach(&adev->dev, dsi);
}
static int ti_sn_bridge_attach(struct drm_bridge *bridge,
+ struct drm_encoder *encoder,
enum drm_bridge_attach_flags flags)
{
struct ti_sn65dsi86 *pdata = bridge_to_ti_sn65dsi86(bridge);
@@ -713,7 +761,7 @@ static int ti_sn_bridge_attach(struct drm_bridge *bridge,
* Attach the next bridge.
* We never want the next bridge to *also* create a connector.
*/
- ret = drm_bridge_attach(bridge->encoder, pdata->next_bridge,
+ ret = drm_bridge_attach(encoder, pdata->next_bridge,
&pdata->bridge, flags | DRM_BRIDGE_ATTACH_NO_CONNECTOR);
if (ret < 0)
goto err_initted_aux;
@@ -778,7 +826,7 @@ ti_sn_bridge_mode_valid(struct drm_bridge *bridge,
}
static void ti_sn_bridge_atomic_disable(struct drm_bridge *bridge,
- struct drm_bridge_state *old_bridge_state)
+ struct drm_atomic_state *state)
{
struct ti_sn65dsi86 *pdata = bridge_to_ti_sn65dsi86(bridge);
@@ -786,12 +834,13 @@ static void ti_sn_bridge_atomic_disable(struct drm_bridge *bridge,
regmap_update_bits(pdata->regmap, SN_ENH_FRAME_REG, VSTREAM_ENABLE, 0);
}
-static void ti_sn_bridge_set_dsi_rate(struct ti_sn65dsi86 *pdata)
+static void ti_sn_bridge_set_dsi_rate(struct ti_sn65dsi86 *pdata,
+ struct drm_atomic_state *state)
{
unsigned int bit_rate_mhz, clk_freq_mhz;
unsigned int val;
struct drm_display_mode *mode =
- &pdata->bridge.encoder->crtc->state->adjusted_mode;
+ get_new_adjusted_display_mode(&pdata->bridge, state);
/* set DSIA clk frequency */
bit_rate_mhz = (mode->clock / 1000) *
@@ -821,12 +870,14 @@ static const unsigned int ti_sn_bridge_dp_rate_lut[] = {
0, 1620, 2160, 2430, 2700, 3240, 4320, 5400
};
-static int ti_sn_bridge_calc_min_dp_rate_idx(struct ti_sn65dsi86 *pdata, unsigned int bpp)
+static int ti_sn_bridge_calc_min_dp_rate_idx(struct ti_sn65dsi86 *pdata,
+ struct drm_atomic_state *state,
+ unsigned int bpp)
{
unsigned int bit_rate_khz, dp_rate_mhz;
unsigned int i;
struct drm_display_mode *mode =
- &pdata->bridge.encoder->crtc->state->adjusted_mode;
+ get_new_adjusted_display_mode(&pdata->bridge, state);
/* Calculate minimum bit rate based on our pixel clock. */
bit_rate_khz = mode->clock * bpp;
@@ -925,15 +976,16 @@ static unsigned int ti_sn_bridge_read_valid_rates(struct ti_sn65dsi86 *pdata)
return valid_rates;
}
-static void ti_sn_bridge_set_video_timings(struct ti_sn65dsi86 *pdata)
+static void ti_sn_bridge_set_video_timings(struct ti_sn65dsi86 *pdata,
+ struct drm_atomic_state *state)
{
struct drm_display_mode *mode =
- &pdata->bridge.encoder->crtc->state->adjusted_mode;
+ get_new_adjusted_display_mode(&pdata->bridge, state);
u8 hsync_polarity = 0, vsync_polarity = 0;
- if (mode->flags & DRM_MODE_FLAG_PHSYNC)
+ if (mode->flags & DRM_MODE_FLAG_NHSYNC)
hsync_polarity = CHA_HSYNC_POLARITY;
- if (mode->flags & DRM_MODE_FLAG_PVSYNC)
+ if (mode->flags & DRM_MODE_FLAG_NVSYNC)
vsync_polarity = CHA_VSYNC_POLARITY;
ti_sn65dsi86_write_u16(pdata, SN_CHA_ACTIVE_LINE_LENGTH_LOW_REG,
@@ -1038,7 +1090,7 @@ exit:
}
static void ti_sn_bridge_atomic_enable(struct drm_bridge *bridge,
- struct drm_bridge_state *old_bridge_state)
+ struct drm_atomic_state *state)
{
struct ti_sn65dsi86 *pdata = bridge_to_ti_sn65dsi86(bridge);
struct drm_connector *connector;
@@ -1050,7 +1102,7 @@ static void ti_sn_bridge_atomic_enable(struct drm_bridge *bridge,
int max_dp_lanes;
unsigned int bpp;
- connector = drm_atomic_get_new_connector_for_encoder(old_bridge_state->base.state,
+ connector = drm_atomic_get_new_connector_for_encoder(state,
bridge->encoder);
if (!connector) {
dev_err_ratelimited(pdata->dev, "Could not get the connector\n");
@@ -1070,7 +1122,7 @@ static void ti_sn_bridge_atomic_enable(struct drm_bridge *bridge,
pdata->ln_polrs << LN_POLRS_OFFSET);
/* set dsi clk frequency value */
- ti_sn_bridge_set_dsi_rate(pdata);
+ ti_sn_bridge_set_dsi_rate(pdata, state);
/*
* The SN65DSI86 only supports ASSR Display Authentication method and
@@ -1105,7 +1157,7 @@ static void ti_sn_bridge_atomic_enable(struct drm_bridge *bridge,
valid_rates = ti_sn_bridge_read_valid_rates(pdata);
/* Train until we run out of rates */
- for (dp_rate_idx = ti_sn_bridge_calc_min_dp_rate_idx(pdata, bpp);
+ for (dp_rate_idx = ti_sn_bridge_calc_min_dp_rate_idx(pdata, state, bpp);
dp_rate_idx < ARRAY_SIZE(ti_sn_bridge_dp_rate_lut);
dp_rate_idx++) {
if (!(valid_rates & BIT(dp_rate_idx)))
@@ -1121,7 +1173,7 @@ static void ti_sn_bridge_atomic_enable(struct drm_bridge *bridge,
}
/* config video parameters */
- ti_sn_bridge_set_video_timings(pdata);
+ ti_sn_bridge_set_video_timings(pdata, state);
/* enable video stream */
regmap_update_bits(pdata->regmap, SN_ENH_FRAME_REG, VSTREAM_ENABLE,
@@ -1129,21 +1181,21 @@ static void ti_sn_bridge_atomic_enable(struct drm_bridge *bridge,
}
static void ti_sn_bridge_atomic_pre_enable(struct drm_bridge *bridge,
- struct drm_bridge_state *old_bridge_state)
+ struct drm_atomic_state *state)
{
struct ti_sn65dsi86 *pdata = bridge_to_ti_sn65dsi86(bridge);
pm_runtime_get_sync(pdata->dev);
if (!pdata->refclk)
- ti_sn65dsi86_enable_comms(pdata);
+ ti_sn65dsi86_enable_comms(pdata, state);
/* td7: min 100 us after enable before DSI data */
usleep_range(100, 110);
}
static void ti_sn_bridge_atomic_post_disable(struct drm_bridge *bridge,
- struct drm_bridge_state *old_bridge_state)
+ struct drm_atomic_state *state)
{
struct ti_sn65dsi86 *pdata = bridge_to_ti_sn65dsi86(bridge);
@@ -1160,32 +1212,93 @@ static void ti_sn_bridge_atomic_post_disable(struct drm_bridge *bridge,
pm_runtime_put_sync(pdata->dev);
}
-static enum drm_connector_status ti_sn_bridge_detect(struct drm_bridge *bridge)
+static enum drm_connector_status
+ti_sn_bridge_detect(struct drm_bridge *bridge, struct drm_connector *connector)
{
struct ti_sn65dsi86 *pdata = bridge_to_ti_sn65dsi86(bridge);
int val = 0;
- pm_runtime_get_sync(pdata->dev);
+ /*
+ * Runtime reference is grabbed in ti_sn_bridge_hpd_enable()
+ * as the chip won't report HPD just after being powered on.
+ * HPD_DEBOUNCED_STATE reflects correct state only after the
+ * debounce time (~100-400 ms).
+ */
+
regmap_read(pdata->regmap, SN_HPD_DISABLE_REG, &val);
- pm_runtime_put_autosuspend(pdata->dev);
return val & HPD_DEBOUNCED_STATE ? connector_status_connected
: connector_status_disconnected;
}
-static struct edid *ti_sn_bridge_get_edid(struct drm_bridge *bridge,
- struct drm_connector *connector)
+static const struct drm_edid *ti_sn_bridge_edid_read(struct drm_bridge *bridge,
+ struct drm_connector *connector)
+{
+ struct ti_sn65dsi86 *pdata = bridge_to_ti_sn65dsi86(bridge);
+
+ return drm_edid_read_ddc(connector, &pdata->aux.ddc);
+}
+
+static void ti_sn65dsi86_debugfs_init(struct drm_bridge *bridge, struct dentry *root)
+{
+ struct ti_sn65dsi86 *pdata = bridge_to_ti_sn65dsi86(bridge);
+ struct dentry *debugfs;
+
+ debugfs = debugfs_create_dir(dev_name(pdata->dev), root);
+ debugfs_create_file("status", 0600, debugfs, pdata, &status_fops);
+}
+
+static void ti_sn_bridge_hpd_enable(struct drm_bridge *bridge)
+{
+ struct ti_sn65dsi86 *pdata = bridge_to_ti_sn65dsi86(bridge);
+ const struct i2c_client *client = to_i2c_client(pdata->dev);
+ int ret;
+
+ /*
+ * Device needs to be powered on before reading the HPD state
+ * for reliable hpd detection in ti_sn_bridge_detect() due to
+ * the high debounce time.
+ */
+
+ pm_runtime_get_sync(pdata->dev);
+
+ mutex_lock(&pdata->hpd_mutex);
+ pdata->hpd_enabled = true;
+ mutex_unlock(&pdata->hpd_mutex);
+
+ if (client->irq) {
+ ret = regmap_set_bits(pdata->regmap, SN_IRQ_EVENTS_EN_REG,
+ HPD_REMOVAL_EN | HPD_INSERTION_EN);
+ if (ret)
+ dev_err(pdata->dev, "Failed to enable HPD events: %d\n", ret);
+ }
+}
+
+static void ti_sn_bridge_hpd_disable(struct drm_bridge *bridge)
{
struct ti_sn65dsi86 *pdata = bridge_to_ti_sn65dsi86(bridge);
+ const struct i2c_client *client = to_i2c_client(pdata->dev);
+ int ret;
+
+ if (client->irq) {
+ ret = regmap_clear_bits(pdata->regmap, SN_IRQ_EVENTS_EN_REG,
+ HPD_REMOVAL_EN | HPD_INSERTION_EN);
+ if (ret)
+ dev_err(pdata->dev, "Failed to disable HPD events: %d\n", ret);
+ }
+
+ mutex_lock(&pdata->hpd_mutex);
+ pdata->hpd_enabled = false;
+ mutex_unlock(&pdata->hpd_mutex);
- return drm_get_edid(connector, &pdata->aux.ddc);
+ pm_runtime_put_autosuspend(pdata->dev);
}
static const struct drm_bridge_funcs ti_sn_bridge_funcs = {
.attach = ti_sn_bridge_attach,
.detach = ti_sn_bridge_detach,
.mode_valid = ti_sn_bridge_mode_valid,
- .get_edid = ti_sn_bridge_get_edid,
+ .edid_read = ti_sn_bridge_edid_read,
.detect = ti_sn_bridge_detect,
.atomic_pre_enable = ti_sn_bridge_atomic_pre_enable,
.atomic_enable = ti_sn_bridge_atomic_enable,
@@ -1194,6 +1307,9 @@ static const struct drm_bridge_funcs ti_sn_bridge_funcs = {
.atomic_reset = drm_atomic_helper_bridge_reset,
.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
+ .debugfs_init = ti_sn65dsi86_debugfs_init,
+ .hpd_enable = ti_sn_bridge_hpd_enable,
+ .hpd_disable = ti_sn_bridge_hpd_disable,
};
static void ti_sn_bridge_parse_lanes(struct ti_sn65dsi86 *pdata,
@@ -1259,6 +1375,41 @@ static int ti_sn_bridge_parse_dsi_host(struct ti_sn65dsi86 *pdata)
return 0;
}
+static irqreturn_t ti_sn_bridge_interrupt(int irq, void *private)
+{
+ struct ti_sn65dsi86 *pdata = private;
+ struct drm_device *dev = pdata->bridge.dev;
+ u8 status;
+ int ret;
+ bool hpd_event;
+
+ ret = ti_sn65dsi86_read_u8(pdata, SN_IRQ_STATUS_REG, &status);
+ if (ret) {
+ dev_err(pdata->dev, "Failed to read IRQ status: %d\n", ret);
+ return IRQ_NONE;
+ }
+
+ hpd_event = status & (HPD_REMOVAL_STATUS | HPD_INSERTION_STATUS);
+
+ dev_dbg(pdata->dev, "(SN_IRQ_STATUS_REG = %#x)\n", status);
+ if (!status)
+ return IRQ_NONE;
+
+ ret = regmap_write(pdata->regmap, SN_IRQ_STATUS_REG, status);
+ if (ret) {
+ dev_err(pdata->dev, "Failed to clear IRQ status: %d\n", ret);
+ return IRQ_NONE;
+ }
+
+ /* Only send the HPD event if we are bound with a device. */
+ mutex_lock(&pdata->hpd_mutex);
+ if (pdata->hpd_enabled && hpd_event)
+ drm_kms_helper_hotplug_event(dev);
+ mutex_unlock(&pdata->hpd_mutex);
+
+ return IRQ_HANDLED;
+}
+
static int ti_sn_bridge_probe(struct auxiliary_device *adev,
const struct auxiliary_device_id *id)
{
@@ -1266,9 +1417,9 @@ static int ti_sn_bridge_probe(struct auxiliary_device *adev,
struct device_node *np = pdata->dev->of_node;
int ret;
- pdata->next_bridge = devm_drm_of_get_bridge(pdata->dev, np, 1, 0);
+ pdata->next_bridge = devm_drm_of_get_bridge(&adev->dev, np, 1, 0);
if (IS_ERR(pdata->next_bridge))
- return dev_err_probe(pdata->dev, PTR_ERR(pdata->next_bridge),
+ return dev_err_probe(&adev->dev, PTR_ERR(pdata->next_bridge),
"failed to create panel bridge\n");
ti_sn_bridge_parse_lanes(pdata, np);
@@ -1277,19 +1428,36 @@ static int ti_sn_bridge_probe(struct auxiliary_device *adev,
if (ret)
return ret;
- pdata->bridge.funcs = &ti_sn_bridge_funcs;
pdata->bridge.of_node = np;
pdata->bridge.type = pdata->next_bridge->type == DRM_MODE_CONNECTOR_DisplayPort
? DRM_MODE_CONNECTOR_DisplayPort : DRM_MODE_CONNECTOR_eDP;
- if (pdata->bridge.type == DRM_MODE_CONNECTOR_DisplayPort)
- pdata->bridge.ops = DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_DETECT;
+ if (pdata->bridge.type == DRM_MODE_CONNECTOR_DisplayPort) {
+ pdata->bridge.ops = DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_DETECT |
+ DRM_BRIDGE_OP_HPD;
+ /*
+ * If comms were already enabled they would have been enabled
+ * with the wrong value of HPD_DISABLE. Update it now. Comms
+ * could be enabled if anyone is holding a pm_runtime reference
+ * (like if a GPIO is in use). Note that in most cases nobody
+ * is doing AUX channel xfers before the bridge is added so
+ * HPD doesn't _really_ matter then. The only exception is in
+ * the eDP case where the panel wants to read the EDID before
+ * the bridge is added. We always consistently have HPD disabled
+ * for eDP.
+ */
+ mutex_lock(&pdata->comms_mutex);
+ if (pdata->comms_enabled)
+ regmap_update_bits(pdata->regmap, SN_HPD_DISABLE_REG,
+ HPD_DISABLE, 0);
+ mutex_unlock(&pdata->comms_mutex);
+ }
drm_bridge_add(&pdata->bridge);
- ret = ti_sn_attach_host(pdata);
+ ret = ti_sn_attach_host(adev, pdata);
if (ret) {
- dev_err_probe(pdata->dev, ret, "failed to attach dsi host\n");
+ dev_err_probe(&adev->dev, ret, "failed to attach dsi host\n");
goto err_remove_bridge;
}
@@ -1327,7 +1495,7 @@ static struct auxiliary_driver ti_sn_bridge_driver = {
/* -----------------------------------------------------------------------------
* PWM Controller
*/
-#if defined(CONFIG_PWM)
+#if IS_REACHABLE(CONFIG_PWM)
static int ti_sn_pwm_pin_request(struct ti_sn65dsi86 *pdata)
{
return atomic_xchg(&pdata->pwm_pin_busy, 1) ? -EBUSY : 0;
@@ -1340,7 +1508,7 @@ static void ti_sn_pwm_pin_release(struct ti_sn65dsi86 *pdata)
static struct ti_sn65dsi86 *pwm_chip_to_ti_sn_bridge(struct pwm_chip *chip)
{
- return container_of(chip, struct ti_sn65dsi86, pchip);
+ return pwmchip_get_drvdata(chip);
}
static int ti_sn_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
@@ -1381,11 +1549,9 @@ static int ti_sn_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
int ret;
if (!pdata->pwm_enabled) {
- ret = pm_runtime_get_sync(pdata->dev);
- if (ret < 0) {
- pm_runtime_put_sync(pdata->dev);
+ ret = pm_runtime_resume_and_get(pwmchip_parent(chip));
+ if (ret < 0)
return ret;
- }
}
if (state->enabled) {
@@ -1399,7 +1565,7 @@ static int ti_sn_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
SN_GPIO_MUX_MASK << (2 * SN_PWM_GPIO_IDX),
SN_GPIO_MUX_SPECIAL << (2 * SN_PWM_GPIO_IDX));
if (ret) {
- dev_err(pdata->dev, "failed to mux in PWM function\n");
+ dev_err(pwmchip_parent(chip), "failed to mux in PWM function\n");
goto out;
}
}
@@ -1475,7 +1641,7 @@ static int ti_sn_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
ret = regmap_write(pdata->regmap, SN_PWM_PRE_DIV_REG, pre_div);
if (ret) {
- dev_err(pdata->dev, "failed to update PWM_PRE_DIV\n");
+ dev_err(pwmchip_parent(chip), "failed to update PWM_PRE_DIV\n");
goto out;
}
@@ -1487,7 +1653,7 @@ static int ti_sn_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
FIELD_PREP(SN_PWM_INV_MASK, state->polarity == PWM_POLARITY_INVERSED);
ret = regmap_write(pdata->regmap, SN_PWM_EN_INV_REG, pwm_en_inv);
if (ret) {
- dev_err(pdata->dev, "failed to update PWM_EN/PWM_INV\n");
+ dev_err(pwmchip_parent(chip), "failed to update PWM_EN/PWM_INV\n");
goto out;
}
@@ -1495,13 +1661,13 @@ static int ti_sn_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
out:
if (!pdata->pwm_enabled)
- pm_runtime_put_sync(pdata->dev);
+ pm_runtime_put_sync(pwmchip_parent(chip));
return ret;
}
-static void ti_sn_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
- struct pwm_state *state)
+static int ti_sn_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
+ struct pwm_state *state)
{
struct ti_sn65dsi86 *pdata = pwm_chip_to_ti_sn_bridge(chip);
unsigned int pwm_en_inv;
@@ -1512,19 +1678,19 @@ static void ti_sn_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
ret = regmap_read(pdata->regmap, SN_PWM_EN_INV_REG, &pwm_en_inv);
if (ret)
- return;
+ return ret;
ret = ti_sn65dsi86_read_u16(pdata, SN_BACKLIGHT_SCALE_REG, &scale);
if (ret)
- return;
+ return ret;
ret = ti_sn65dsi86_read_u16(pdata, SN_BACKLIGHT_REG, &backlight);
if (ret)
- return;
+ return ret;
ret = regmap_read(pdata->regmap, SN_PWM_PRE_DIV_REG, &pre_div);
if (ret)
- return;
+ return ret;
state->enabled = FIELD_GET(SN_PWM_EN_MASK, pwm_en_inv);
if (FIELD_GET(SN_PWM_INV_MASK, pwm_en_inv))
@@ -1539,6 +1705,8 @@ static void ti_sn_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
if (state->duty_cycle > state->period)
state->duty_cycle = state->period;
+
+ return 0;
}
static const struct pwm_ops ti_sn_pwm_ops = {
@@ -1546,31 +1714,36 @@ static const struct pwm_ops ti_sn_pwm_ops = {
.free = ti_sn_pwm_free,
.apply = ti_sn_pwm_apply,
.get_state = ti_sn_pwm_get_state,
- .owner = THIS_MODULE,
};
static int ti_sn_pwm_probe(struct auxiliary_device *adev,
const struct auxiliary_device_id *id)
{
+ struct pwm_chip *chip;
struct ti_sn65dsi86 *pdata = dev_get_drvdata(adev->dev.parent);
- pdata->pchip.dev = pdata->dev;
- pdata->pchip.ops = &ti_sn_pwm_ops;
- pdata->pchip.npwm = 1;
- pdata->pchip.of_xlate = of_pwm_single_xlate;
- pdata->pchip.of_pwm_n_cells = 1;
+ pdata->pchip = chip = devm_pwmchip_alloc(&adev->dev, 1, 0);
+ if (IS_ERR(chip))
+ return PTR_ERR(chip);
+
+ pwmchip_set_drvdata(chip, pdata);
+
+ chip->ops = &ti_sn_pwm_ops;
+ chip->of_xlate = of_pwm_single_xlate;
- return pwmchip_add(&pdata->pchip);
+ devm_pm_runtime_enable(&adev->dev);
+
+ return pwmchip_add(chip);
}
static void ti_sn_pwm_remove(struct auxiliary_device *adev)
{
struct ti_sn65dsi86 *pdata = dev_get_drvdata(adev->dev.parent);
- pwmchip_remove(&pdata->pchip);
+ pwmchip_remove(pdata->pchip);
if (pdata->pwm_enabled)
- pm_runtime_put_sync(pdata->dev);
+ pm_runtime_put_sync(&adev->dev);
}
static const struct auxiliary_device_id ti_sn_pwm_id_table[] = {
@@ -1596,8 +1769,8 @@ static void ti_sn_pwm_unregister(void)
}
#else
-static inline int ti_sn_pwm_pin_request(struct ti_sn65dsi86 *pdata) { return 0; }
-static inline void ti_sn_pwm_pin_release(struct ti_sn65dsi86 *pdata) {}
+static inline int __maybe_unused ti_sn_pwm_pin_request(struct ti_sn65dsi86 *pdata) { return 0; }
+static inline void __maybe_unused ti_sn_pwm_pin_release(struct ti_sn65dsi86 *pdata) {}
static inline int ti_sn_pwm_register(void) { return 0; }
static inline void ti_sn_pwm_unregister(void) {}
@@ -1663,24 +1836,15 @@ static int ti_sn_bridge_gpio_get(struct gpio_chip *chip, unsigned int offset)
return !!(val & BIT(SN_GPIO_INPUT_SHIFT + offset));
}
-static void ti_sn_bridge_gpio_set(struct gpio_chip *chip, unsigned int offset,
- int val)
+static int ti_sn_bridge_gpio_set(struct gpio_chip *chip, unsigned int offset,
+ int val)
{
struct ti_sn65dsi86 *pdata = gpiochip_get_data(chip);
- int ret;
-
- if (!test_bit(offset, pdata->gchip_output)) {
- dev_err(pdata->dev, "Ignoring GPIO set while input\n");
- return;
- }
val &= 1;
- ret = regmap_update_bits(pdata->regmap, SN_GPIO_IO_REG,
- BIT(SN_GPIO_OUTPUT_SHIFT + offset),
- val << (SN_GPIO_OUTPUT_SHIFT + offset));
- if (ret)
- dev_warn(pdata->dev,
- "Failed to set bridge GPIO %u: %d\n", offset, ret);
+ return regmap_update_bits(pdata->regmap, SN_GPIO_IO_REG,
+ BIT(SN_GPIO_OUTPUT_SHIFT + offset),
+ val << (SN_GPIO_OUTPUT_SHIFT + offset));
}
static int ti_sn_bridge_gpio_direction_input(struct gpio_chip *chip,
@@ -1850,11 +2014,11 @@ static int ti_sn65dsi86_parse_regulators(struct ti_sn65dsi86 *pdata)
pdata->supplies);
}
-static int ti_sn65dsi86_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
+static int ti_sn65dsi86_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct ti_sn65dsi86 *pdata;
+ u8 id_buf[8];
int ret;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
@@ -1862,12 +2026,13 @@ static int ti_sn65dsi86_probe(struct i2c_client *client,
return -ENODEV;
}
- pdata = devm_kzalloc(dev, sizeof(struct ti_sn65dsi86), GFP_KERNEL);
- if (!pdata)
- return -ENOMEM;
+ pdata = devm_drm_bridge_alloc(dev, struct ti_sn65dsi86, bridge, &ti_sn_bridge_funcs);
+ if (IS_ERR(pdata))
+ return PTR_ERR(pdata);
dev_set_drvdata(dev, pdata);
pdata->dev = dev;
+ mutex_init(&pdata->hpd_mutex);
mutex_init(&pdata->comms_mutex);
pdata->regmap = devm_regmap_init_i2c(client,
@@ -1898,7 +2063,25 @@ static int ti_sn65dsi86_probe(struct i2c_client *client,
if (ret)
return ret;
- ti_sn65dsi86_debugfs_init(pdata);
+ pm_runtime_get_sync(dev);
+ ret = regmap_bulk_read(pdata->regmap, SN_DEVICE_ID_REGS, id_buf, ARRAY_SIZE(id_buf));
+ pm_runtime_put_autosuspend(dev);
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to read device id\n");
+
+ /* The ID string is stored backwards */
+ if (strncmp(id_buf, "68ISD ", ARRAY_SIZE(id_buf)))
+ return dev_err_probe(dev, -EOPNOTSUPP, "unsupported device id\n");
+
+ if (client->irq) {
+ ret = devm_request_threaded_irq(pdata->dev, client->irq, NULL,
+ ti_sn_bridge_interrupt,
+ IRQF_ONESHOT,
+ dev_name(pdata->dev), pdata);
+
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to request interrupt\n");
+ }
/*
* Break ourselves up into a collection of aux devices. The only real
@@ -1917,7 +2100,7 @@ static int ti_sn65dsi86_probe(struct i2c_client *client,
return ret;
}
- if (IS_ENABLED(CONFIG_PWM)) {
+ if (IS_REACHABLE(CONFIG_PWM)) {
ret = ti_sn65dsi86_add_aux_device(pdata, &pdata->pwm_aux, "pwm");
if (ret)
return ret;
@@ -1932,9 +2115,9 @@ static int ti_sn65dsi86_probe(struct i2c_client *client,
return ti_sn65dsi86_add_aux_device(pdata, &pdata->aux_aux, "aux");
}
-static struct i2c_device_id ti_sn65dsi86_id[] = {
- { "ti,sn65dsi86", 0},
- {},
+static const struct i2c_device_id ti_sn65dsi86_id[] = {
+ { "ti,sn65dsi86" },
+ {}
};
MODULE_DEVICE_TABLE(i2c, ti_sn65dsi86_id);
generated by cgit (git 2.34.1) at 2025-12-25 01:52:21 +0000