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path: root/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
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Diffstat (limited to 'drivers/gpu/drm/rcar-du/rcar_du_crtc.c')
-rw-r--r--drivers/gpu/drm/rcar-du/rcar_du_crtc.c189
1 files changed, 138 insertions, 51 deletions
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
index f131fc68cc46..301ea1a8018e 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
@@ -13,6 +13,7 @@
#include <linux/clk.h>
#include <linux/mutex.h>
+#include <linux/sys_soc.h>
#include <drm/drmP.h>
#include <drm/drm_atomic.h>
@@ -129,10 +130,8 @@ static void rcar_du_dpll_divider(struct rcar_du_crtc *rcrtc,
for (fdpll = 1; fdpll < 32; fdpll++) {
unsigned long output;
- /* 1/2 (FRQSEL=1) for duty rate 50% */
output = input * (n + 1) / (m + 1)
- / (fdpll + 1) / 2;
-
+ / (fdpll + 1);
if (output >= 400000000)
continue;
@@ -158,6 +157,11 @@ done:
best_diff);
}
+static const struct soc_device_attribute rcar_du_r8a7795_es1[] = {
+ { .soc_id = "r8a7795", .revision = "ES1.*" },
+ { /* sentinel */ }
+};
+
static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc)
{
const struct drm_display_mode *mode = &rcrtc->crtc.state->adjusted_mode;
@@ -168,7 +172,8 @@ static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc)
u32 escr;
u32 div;
- /* Compute the clock divisor and select the internal or external dot
+ /*
+ * Compute the clock divisor and select the internal or external dot
* clock based on the requested frequency.
*/
clk = clk_get_rate(rcrtc->clock);
@@ -185,7 +190,20 @@ static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc)
extclk = clk_get_rate(rcrtc->extclock);
if (rcdu->info->dpll_ch & (1 << rcrtc->index)) {
- rcar_du_dpll_divider(rcrtc, &dpll, extclk, mode_clock);
+ unsigned long target = mode_clock;
+
+ /*
+ * The H3 ES1.x exhibits dot clock duty cycle stability
+ * issues. We can work around them by configuring the
+ * DPLL to twice the desired frequency, coupled with a
+ * /2 post-divider. This isn't needed on other SoCs and
+ * breaks HDMI output on M3-W for a currently unknown
+ * reason, so restrict the workaround to H3 ES1.x.
+ */
+ if (soc_device_match(rcar_du_r8a7795_es1))
+ target *= 2;
+
+ rcar_du_dpll_divider(rcrtc, &dpll, extclk, target);
extclk = dpll.output;
}
@@ -197,8 +215,6 @@ static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc)
if (abs((long)extrate - (long)mode_clock) <
abs((long)rate - (long)mode_clock)) {
- dev_dbg(rcrtc->group->dev->dev,
- "crtc%u: using external clock\n", rcrtc->index);
if (rcdu->info->dpll_ch & (1 << rcrtc->index)) {
u32 dpllcr = DPLLCR_CODE | DPLLCR_CLKE
@@ -215,12 +231,14 @@ static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc)
rcar_du_group_write(rcrtc->group, DPLLCR,
dpllcr);
-
- escr = ESCR_DCLKSEL_DCLKIN | 1;
- } else {
- escr = ESCR_DCLKSEL_DCLKIN | extdiv;
}
+
+ escr = ESCR_DCLKSEL_DCLKIN | extdiv;
}
+
+ dev_dbg(rcrtc->group->dev->dev,
+ "mode clock %lu extrate %lu rate %lu ESCR 0x%08x\n",
+ mode_clock, extrate, rate, escr);
}
rcar_du_group_write(rcrtc->group, rcrtc->index % 2 ? ESCR2 : ESCR,
@@ -261,12 +279,14 @@ void rcar_du_crtc_route_output(struct drm_crtc *crtc,
struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
struct rcar_du_device *rcdu = rcrtc->group->dev;
- /* Store the route from the CRTC output to the DU output. The DU will be
+ /*
+ * Store the route from the CRTC output to the DU output. The DU will be
* configured when starting the CRTC.
*/
rcrtc->outputs |= BIT(output);
- /* Store RGB routing to DPAD0, the hardware will be configured when
+ /*
+ * Store RGB routing to DPAD0, the hardware will be configured when
* starting the CRTC.
*/
if (output == RCAR_DU_OUTPUT_DPAD0)
@@ -342,7 +362,8 @@ static void rcar_du_crtc_update_planes(struct rcar_du_crtc *rcrtc)
}
}
- /* Update the planes to display timing and dot clock generator
+ /*
+ * Update the planes to display timing and dot clock generator
* associations.
*
* Updating the DPTSR register requires restarting the CRTC group,
@@ -431,14 +452,8 @@ static void rcar_du_crtc_wait_page_flip(struct rcar_du_crtc *rcrtc)
* Start/Stop and Suspend/Resume
*/
-static void rcar_du_crtc_start(struct rcar_du_crtc *rcrtc)
+static void rcar_du_crtc_setup(struct rcar_du_crtc *rcrtc)
{
- struct drm_crtc *crtc = &rcrtc->crtc;
- bool interlaced;
-
- if (rcrtc->started)
- return;
-
/* Set display off and background to black */
rcar_du_crtc_write(rcrtc, DOOR, DOOR_RGB(0, 0, 0));
rcar_du_crtc_write(rcrtc, BPOR, BPOR_RGB(0, 0, 0));
@@ -450,7 +465,20 @@ static void rcar_du_crtc_start(struct rcar_du_crtc *rcrtc)
/* Start with all planes disabled. */
rcar_du_group_write(rcrtc->group, rcrtc->index % 2 ? DS2PR : DS1PR, 0);
- /* Select master sync mode. This enables display operation in master
+ /* Enable the VSP compositor. */
+ if (rcar_du_has(rcrtc->group->dev, RCAR_DU_FEATURE_VSP1_SOURCE))
+ rcar_du_vsp_enable(rcrtc);
+
+ /* Turn vertical blanking interrupt reporting on. */
+ drm_crtc_vblank_on(&rcrtc->crtc);
+}
+
+static void rcar_du_crtc_start(struct rcar_du_crtc *rcrtc)
+{
+ bool interlaced;
+
+ /*
+ * Select master sync mode. This enables display operation in master
* sync mode (with the HSYNC and VSYNC signals configured as outputs and
* actively driven).
*/
@@ -460,38 +488,56 @@ static void rcar_du_crtc_start(struct rcar_du_crtc *rcrtc)
DSYSR_TVM_MASTER);
rcar_du_group_start_stop(rcrtc->group, true);
+}
- /* Enable the VSP compositor. */
- if (rcar_du_has(rcrtc->group->dev, RCAR_DU_FEATURE_VSP1_SOURCE))
- rcar_du_vsp_enable(rcrtc);
+static void rcar_du_crtc_disable_planes(struct rcar_du_crtc *rcrtc)
+{
+ struct rcar_du_device *rcdu = rcrtc->group->dev;
+ struct drm_crtc *crtc = &rcrtc->crtc;
+ u32 status;
- /* Turn vertical blanking interrupt reporting back on. */
- drm_crtc_vblank_on(crtc);
+ /* Make sure vblank interrupts are enabled. */
+ drm_crtc_vblank_get(crtc);
- rcrtc->started = true;
+ /*
+ * Disable planes and calculate how many vertical blanking interrupts we
+ * have to wait for. If a vertical blanking interrupt has been triggered
+ * but not processed yet, we don't know whether it occurred before or
+ * after the planes got disabled. We thus have to wait for two vblank
+ * interrupts in that case.
+ */
+ spin_lock_irq(&rcrtc->vblank_lock);
+ rcar_du_group_write(rcrtc->group, rcrtc->index % 2 ? DS2PR : DS1PR, 0);
+ status = rcar_du_crtc_read(rcrtc, DSSR);
+ rcrtc->vblank_count = status & DSSR_VBK ? 2 : 1;
+ spin_unlock_irq(&rcrtc->vblank_lock);
+
+ if (!wait_event_timeout(rcrtc->vblank_wait, rcrtc->vblank_count == 0,
+ msecs_to_jiffies(100)))
+ dev_warn(rcdu->dev, "vertical blanking timeout\n");
+
+ drm_crtc_vblank_put(crtc);
}
static void rcar_du_crtc_stop(struct rcar_du_crtc *rcrtc)
{
struct drm_crtc *crtc = &rcrtc->crtc;
- if (!rcrtc->started)
- return;
-
- /* Disable all planes and wait for the change to take effect. This is
- * required as the DSnPR registers are updated on vblank, and no vblank
- * will occur once the CRTC is stopped. Disabling planes when starting
- * the CRTC thus wouldn't be enough as it would start scanning out
- * immediately from old frame buffers until the next vblank.
+ /*
+ * Disable all planes and wait for the change to take effect. This is
+ * required as the plane enable registers are updated on vblank, and no
+ * vblank will occur once the CRTC is stopped. Disabling planes when
+ * starting the CRTC thus wouldn't be enough as it would start scanning
+ * out immediately from old frame buffers until the next vblank.
*
* This increases the CRTC stop delay, especially when multiple CRTCs
* are stopped in one operation as we now wait for one vblank per CRTC.
* Whether this can be improved needs to be researched.
*/
- rcar_du_group_write(rcrtc->group, rcrtc->index % 2 ? DS2PR : DS1PR, 0);
- drm_crtc_wait_one_vblank(crtc);
+ rcar_du_crtc_disable_planes(rcrtc);
- /* Disable vertical blanking interrupt reporting. We first need to wait
+ /*
+ * Disable vertical blanking interrupt reporting. We first need to wait
* for page flip completion before stopping the CRTC as userspace
* expects page flips to eventually complete.
*/
@@ -502,14 +548,13 @@ static void rcar_du_crtc_stop(struct rcar_du_crtc *rcrtc)
if (rcar_du_has(rcrtc->group->dev, RCAR_DU_FEATURE_VSP1_SOURCE))
rcar_du_vsp_disable(rcrtc);
- /* Select switch sync mode. This stops display operation and configures
+ /*
+ * Select switch sync mode. This stops display operation and configures
* the HSYNC and VSYNC signals as inputs.
*/
rcar_du_crtc_clr_set(rcrtc, DSYSR, DSYSR_TVM_MASK, DSYSR_TVM_SWITCH);
rcar_du_group_start_stop(rcrtc->group, false);
-
- rcrtc->started = false;
}
void rcar_du_crtc_suspend(struct rcar_du_crtc *rcrtc)
@@ -529,12 +574,10 @@ void rcar_du_crtc_resume(struct rcar_du_crtc *rcrtc)
return;
rcar_du_crtc_get(rcrtc);
- rcar_du_crtc_start(rcrtc);
+ rcar_du_crtc_setup(rcrtc);
/* Commit the planes state. */
- if (rcar_du_has(rcrtc->group->dev, RCAR_DU_FEATURE_VSP1_SOURCE)) {
- rcar_du_vsp_enable(rcrtc);
- } else {
+ if (!rcar_du_has(rcrtc->group->dev, RCAR_DU_FEATURE_VSP1_SOURCE)) {
for (i = 0; i < rcrtc->group->num_planes; ++i) {
struct rcar_du_plane *plane = &rcrtc->group->planes[i];
@@ -546,6 +589,7 @@ void rcar_du_crtc_resume(struct rcar_du_crtc *rcrtc)
}
rcar_du_crtc_update_planes(rcrtc);
+ rcar_du_crtc_start(rcrtc);
}
/* -----------------------------------------------------------------------------
@@ -557,7 +601,16 @@ static void rcar_du_crtc_atomic_enable(struct drm_crtc *crtc,
{
struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
- rcar_du_crtc_get(rcrtc);
+ /*
+ * If the CRTC has already been setup by the .atomic_begin() handler we
+ * can skip the setup stage.
+ */
+ if (!rcrtc->initialized) {
+ rcar_du_crtc_get(rcrtc);
+ rcar_du_crtc_setup(rcrtc);
+ rcrtc->initialized = true;
+ }
+
rcar_du_crtc_start(rcrtc);
}
@@ -576,6 +629,7 @@ static void rcar_du_crtc_atomic_disable(struct drm_crtc *crtc,
}
spin_unlock_irq(&crtc->dev->event_lock);
+ rcrtc->initialized = false;
rcrtc->outputs = 0;
}
@@ -584,6 +638,19 @@ static void rcar_du_crtc_atomic_begin(struct drm_crtc *crtc,
{
struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
+ WARN_ON(!crtc->state->enable);
+
+ /*
+ * If a mode set is in progress we can be called with the CRTC disabled.
+ * We then need to first setup the CRTC in order to configure planes.
+ * The .atomic_enable() handler will notice and skip the CRTC setup.
+ */
+ if (!rcrtc->initialized) {
+ rcar_du_crtc_get(rcrtc);
+ rcar_du_crtc_setup(rcrtc);
+ rcrtc->initialized = true;
+ }
+
if (rcar_du_has(rcrtc->group->dev, RCAR_DU_FEATURE_VSP1_SOURCE))
rcar_du_vsp_atomic_begin(rcrtc);
}
@@ -623,6 +690,7 @@ static int rcar_du_crtc_enable_vblank(struct drm_crtc *crtc)
rcar_du_crtc_write(rcrtc, DSRCR, DSRCR_VBCL);
rcar_du_crtc_set(rcrtc, DIER, DIER_VBE);
+ rcrtc->vblank_enable = true;
return 0;
}
@@ -632,6 +700,7 @@ static void rcar_du_crtc_disable_vblank(struct drm_crtc *crtc)
struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
rcar_du_crtc_clr(rcrtc, DIER, DIER_VBE);
+ rcrtc->vblank_enable = false;
}
static const struct drm_crtc_funcs crtc_funcs = {
@@ -656,14 +725,30 @@ static irqreturn_t rcar_du_crtc_irq(int irq, void *arg)
irqreturn_t ret = IRQ_NONE;
u32 status;
+ spin_lock(&rcrtc->vblank_lock);
+
status = rcar_du_crtc_read(rcrtc, DSSR);
rcar_du_crtc_write(rcrtc, DSRCR, status & DSRCR_MASK);
- if (status & DSSR_FRM) {
- drm_crtc_handle_vblank(&rcrtc->crtc);
+ if (status & DSSR_VBK) {
+ /*
+ * Wake up the vblank wait if the counter reaches 0. This must
+ * be protected by the vblank_lock to avoid races in
+ * rcar_du_crtc_disable_planes().
+ */
+ if (rcrtc->vblank_count) {
+ if (--rcrtc->vblank_count == 0)
+ wake_up(&rcrtc->vblank_wait);
+ }
+ }
- if (rcdu->info->gen < 3)
+ spin_unlock(&rcrtc->vblank_lock);
+
+ if (status & DSSR_VBK) {
+ if (rcdu->info->gen < 3) {
+ drm_crtc_handle_vblank(&rcrtc->crtc);
rcar_du_crtc_finish_page_flip(rcrtc);
+ }
ret = IRQ_HANDLED;
}
@@ -717,13 +802,15 @@ int rcar_du_crtc_create(struct rcar_du_group *rgrp, unsigned int index)
}
init_waitqueue_head(&rcrtc->flip_wait);
+ init_waitqueue_head(&rcrtc->vblank_wait);
+ spin_lock_init(&rcrtc->vblank_lock);
rcrtc->group = rgrp;
rcrtc->mmio_offset = mmio_offsets[index];
rcrtc->index = index;
if (rcar_du_has(rcdu, RCAR_DU_FEATURE_VSP1_SOURCE))
- primary = &rcrtc->vsp->planes[0].plane;
+ primary = &rcrtc->vsp->planes[rcrtc->vsp_pipe].plane;
else
primary = &rgrp->planes[index % 2].plane;