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path: root/drivers/gpu/drm/i915/intel_i2c.c
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Diffstat (limited to 'drivers/gpu/drm/i915/intel_i2c.c')
-rw-r--r--drivers/gpu/drm/i915/intel_i2c.c98
1 files changed, 79 insertions, 19 deletions
diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c
index ef9f91a0b0c9..e6875509bcd9 100644
--- a/drivers/gpu/drm/i915/intel_i2c.c
+++ b/drivers/gpu/drm/i915/intel_i2c.c
@@ -30,6 +30,7 @@
#include <linux/i2c-algo-bit.h>
#include <linux/export.h>
#include <drm/drmP.h>
+#include <drm/drm_hdcp.h>
#include "intel_drv.h"
#include <drm/i915_drm.h>
#include "i915_drv.h"
@@ -75,11 +76,22 @@ static const struct gmbus_pin gmbus_pins_cnp[] = {
[GMBUS_PIN_4_CNP] = { "dpd", GPIOE },
};
+static const struct gmbus_pin gmbus_pins_icp[] = {
+ [GMBUS_PIN_1_BXT] = { "dpa", GPIOA },
+ [GMBUS_PIN_2_BXT] = { "dpb", GPIOB },
+ [GMBUS_PIN_9_TC1_ICP] = { "tc1", GPIOC },
+ [GMBUS_PIN_10_TC2_ICP] = { "tc2", GPIOD },
+ [GMBUS_PIN_11_TC3_ICP] = { "tc3", GPIOE },
+ [GMBUS_PIN_12_TC4_ICP] = { "tc4", GPIOF },
+};
+
/* pin is expected to be valid */
static const struct gmbus_pin *get_gmbus_pin(struct drm_i915_private *dev_priv,
unsigned int pin)
{
- if (HAS_PCH_CNP(dev_priv))
+ if (HAS_PCH_ICP(dev_priv))
+ return &gmbus_pins_icp[pin];
+ else if (HAS_PCH_CNP(dev_priv))
return &gmbus_pins_cnp[pin];
else if (IS_GEN9_LP(dev_priv))
return &gmbus_pins_bxt[pin];
@@ -96,7 +108,9 @@ bool intel_gmbus_is_valid_pin(struct drm_i915_private *dev_priv,
{
unsigned int size;
- if (HAS_PCH_CNP(dev_priv))
+ if (HAS_PCH_ICP(dev_priv))
+ size = ARRAY_SIZE(gmbus_pins_icp);
+ else if (HAS_PCH_CNP(dev_priv))
size = ARRAY_SIZE(gmbus_pins_cnp);
else if (IS_GEN9_LP(dev_priv))
size = ARRAY_SIZE(gmbus_pins_bxt);
@@ -402,7 +416,8 @@ gmbus_xfer_read(struct drm_i915_private *dev_priv, struct i2c_msg *msg,
static int
gmbus_xfer_write_chunk(struct drm_i915_private *dev_priv,
- unsigned short addr, u8 *buf, unsigned int len)
+ unsigned short addr, u8 *buf, unsigned int len,
+ u32 gmbus1_index)
{
unsigned int chunk_size = len;
u32 val, loop;
@@ -415,7 +430,7 @@ gmbus_xfer_write_chunk(struct drm_i915_private *dev_priv,
I915_WRITE_FW(GMBUS3, val);
I915_WRITE_FW(GMBUS1,
- GMBUS_CYCLE_WAIT |
+ gmbus1_index | GMBUS_CYCLE_WAIT |
(chunk_size << GMBUS_BYTE_COUNT_SHIFT) |
(addr << GMBUS_SLAVE_ADDR_SHIFT) |
GMBUS_SLAVE_WRITE | GMBUS_SW_RDY);
@@ -438,7 +453,8 @@ gmbus_xfer_write_chunk(struct drm_i915_private *dev_priv,
}
static int
-gmbus_xfer_write(struct drm_i915_private *dev_priv, struct i2c_msg *msg)
+gmbus_xfer_write(struct drm_i915_private *dev_priv, struct i2c_msg *msg,
+ u32 gmbus1_index)
{
u8 *buf = msg->buf;
unsigned int tx_size = msg->len;
@@ -448,7 +464,8 @@ gmbus_xfer_write(struct drm_i915_private *dev_priv, struct i2c_msg *msg)
do {
len = min(tx_size, GMBUS_BYTE_COUNT_MAX);
- ret = gmbus_xfer_write_chunk(dev_priv, msg->addr, buf, len);
+ ret = gmbus_xfer_write_chunk(dev_priv, msg->addr, buf, len,
+ gmbus1_index);
if (ret)
return ret;
@@ -460,21 +477,21 @@ gmbus_xfer_write(struct drm_i915_private *dev_priv, struct i2c_msg *msg)
}
/*
- * The gmbus controller can combine a 1 or 2 byte write with a read that
- * immediately follows it by using an "INDEX" cycle.
+ * The gmbus controller can combine a 1 or 2 byte write with another read/write
+ * that immediately follows it by using an "INDEX" cycle.
*/
static bool
-gmbus_is_index_read(struct i2c_msg *msgs, int i, int num)
+gmbus_is_index_xfer(struct i2c_msg *msgs, int i, int num)
{
return (i + 1 < num &&
msgs[i].addr == msgs[i + 1].addr &&
!(msgs[i].flags & I2C_M_RD) &&
(msgs[i].len == 1 || msgs[i].len == 2) &&
- (msgs[i + 1].flags & I2C_M_RD));
+ msgs[i + 1].len > 0);
}
static int
-gmbus_xfer_index_read(struct drm_i915_private *dev_priv, struct i2c_msg *msgs)
+gmbus_index_xfer(struct drm_i915_private *dev_priv, struct i2c_msg *msgs)
{
u32 gmbus1_index = 0;
u32 gmbus5 = 0;
@@ -491,7 +508,10 @@ gmbus_xfer_index_read(struct drm_i915_private *dev_priv, struct i2c_msg *msgs)
if (gmbus5)
I915_WRITE_FW(GMBUS5, gmbus5);
- ret = gmbus_xfer_read(dev_priv, &msgs[1], gmbus1_index);
+ if (msgs[1].flags & I2C_M_RD)
+ ret = gmbus_xfer_read(dev_priv, &msgs[1], gmbus1_index);
+ else
+ ret = gmbus_xfer_write(dev_priv, &msgs[1], gmbus1_index);
/* Clear GMBUS5 after each index transfer */
if (gmbus5)
@@ -501,7 +521,8 @@ gmbus_xfer_index_read(struct drm_i915_private *dev_priv, struct i2c_msg *msgs)
}
static int
-do_gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
+do_gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num,
+ u32 gmbus0_source)
{
struct intel_gmbus *bus = container_of(adapter,
struct intel_gmbus,
@@ -518,17 +539,17 @@ do_gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
pch_gmbus_clock_gating(dev_priv, false);
retry:
- I915_WRITE_FW(GMBUS0, bus->reg0);
+ I915_WRITE_FW(GMBUS0, gmbus0_source | bus->reg0);
for (; i < num; i += inc) {
inc = 1;
- if (gmbus_is_index_read(msgs, i, num)) {
- ret = gmbus_xfer_index_read(dev_priv, &msgs[i]);
- inc = 2; /* an index read is two msgs */
+ if (gmbus_is_index_xfer(msgs, i, num)) {
+ ret = gmbus_index_xfer(dev_priv, &msgs[i]);
+ inc = 2; /* an index transmission is two msgs */
} else if (msgs[i].flags & I2C_M_RD) {
ret = gmbus_xfer_read(dev_priv, &msgs[i], 0);
} else {
- ret = gmbus_xfer_write(dev_priv, &msgs[i]);
+ ret = gmbus_xfer_write(dev_priv, &msgs[i], 0);
}
if (!ret)
@@ -643,7 +664,7 @@ gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
if (ret < 0)
bus->force_bit &= ~GMBUS_FORCE_BIT_RETRY;
} else {
- ret = do_gmbus_xfer(adapter, msgs, num);
+ ret = do_gmbus_xfer(adapter, msgs, num, 0);
if (ret == -EAGAIN)
bus->force_bit |= GMBUS_FORCE_BIT_RETRY;
}
@@ -653,6 +674,45 @@ gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
return ret;
}
+int intel_gmbus_output_aksv(struct i2c_adapter *adapter)
+{
+ struct intel_gmbus *bus = container_of(adapter, struct intel_gmbus,
+ adapter);
+ struct drm_i915_private *dev_priv = bus->dev_priv;
+ int ret;
+ u8 cmd = DRM_HDCP_DDC_AKSV;
+ u8 buf[DRM_HDCP_KSV_LEN] = { 0 };
+ struct i2c_msg msgs[] = {
+ {
+ .addr = DRM_HDCP_DDC_ADDR,
+ .flags = 0,
+ .len = sizeof(cmd),
+ .buf = &cmd,
+ },
+ {
+ .addr = DRM_HDCP_DDC_ADDR,
+ .flags = 0,
+ .len = sizeof(buf),
+ .buf = buf,
+ }
+ };
+
+ intel_display_power_get(dev_priv, POWER_DOMAIN_GMBUS);
+ mutex_lock(&dev_priv->gmbus_mutex);
+
+ /*
+ * In order to output Aksv to the receiver, use an indexed write to
+ * pass the i2c command, and tell GMBUS to use the HW-provided value
+ * instead of sourcing GMBUS3 for the data.
+ */
+ ret = do_gmbus_xfer(adapter, msgs, ARRAY_SIZE(msgs), GMBUS_AKSV_SELECT);
+
+ mutex_unlock(&dev_priv->gmbus_mutex);
+ intel_display_power_put(dev_priv, POWER_DOMAIN_GMBUS);
+
+ return ret;
+}
+
static u32 gmbus_func(struct i2c_adapter *adapter)
{
return i2c_bit_algo.functionality(adapter) &
generated by cgit (git 2.34.1) at 2024-06-14 04:33:40 +0000