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drm/i915: wait for actual vblank, not just 20ms 

Waiting for a hard coded 20ms isn't always enough to make sure a vblank
period has actually occurred, so add code to make sure we really have
passed through a vblank period (or that the pipe is off when disabling).

This prevents problems with mode setting and link training, and seems to
fix a bug like https://bugs.freedesktop.org/show_bug.cgi?id=29278, but
on an HP 8440p instead.  Hopefully also fixes
https://bugs.freedesktop.org/show_bug.cgi?id=29141.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
hifive-unleashed-5.1
Jesse Barnes 2010-08-18 13:20:54 -07:00 committed by Eric Anholt
parent d240f20f54
commit 9d0498a2bf
7 changed files with 69 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/i915/i915_reg.h
View File

@ -2081,6 +2081,7 @@
#define PIPE_DITHER_TYPE_ST01 (1 << 2)
/* Pipe A */
#define PIPEADSL 0x70000
#define DSL_LINEMASK 0x00000fff
#define PIPEACONF 0x70008
#define PIPEACONF_ENABLE (1<<31)
#define PIPEACONF_DISABLE 0

2
drivers/gpu/drm/i915/intel_crt.c
View File

@ -328,7 +328,7 @@ intel_crt_load_detect(struct drm_crtc *crtc, struct intel_encoder *intel_encoder
I915_WRITE(pipeconf_reg, pipeconf | PIPECONF_FORCE_BORDER);
/* Wait for next Vblank to substitue
* border color for Color info */
intel_wait_for_vblank(dev);
intel_wait_for_vblank(dev, pipe);
st00 = I915_READ8(VGA_MSR_WRITE);
status = ((st00 & (1 << 4)) != 0) ?
connector_status_connected :

78
drivers/gpu/drm/i915/intel_display.c
View File

@ -977,14 +977,54 @@ intel_find_pll_g4x_dp(const intel_limit_t *limit, struct drm_crtc *crtc,
return true;
}
void
intel_wait_for_vblank(struct drm_device *dev)
/**
* intel_wait_for_vblank - wait for vblank on a given pipe
* @dev: drm device
* @pipe: pipe to wait for
*
* Wait for vblank to occur on a given pipe. Needed for various bits of
* mode setting code.
*/
void intel_wait_for_vblank(struct drm_device *dev, int pipe)
{
/* Wait for 20ms, i.e. one cycle at 50hz. */
if (in_dbg_master())
mdelay(20); /* The kernel debugger cannot call msleep() */
else
msleep(20);
struct drm_i915_private *dev_priv = dev->dev_private;
int pipestat_reg = (pipe == 0 ? PIPEASTAT : PIPEBSTAT);
/* Wait for vblank interrupt bit to set */
if (wait_for((I915_READ(pipestat_reg) &
PIPE_VBLANK_INTERRUPT_STATUS) == 0,
50, 0))
DRM_DEBUG_KMS("vblank wait timed out\n");
}
/**
* intel_wait_for_vblank_off - wait for vblank after disabling a pipe
* @dev: drm device
* @pipe: pipe to wait for
*
* After disabling a pipe, we can't wait for vblank in the usual way,
* spinning on the vblank interrupt status bit, since we won't actually
* see an interrupt when the pipe is disabled.
*
* So this function waits for the display line value to settle (it
* usually ends up stopping at the start of the next frame).
*/
void intel_wait_for_vblank_off(struct drm_device *dev, int pipe)
{
struct drm_i915_private *dev_priv = dev->dev_private;
int pipedsl_reg = (pipe == 0 ? PIPEADSL : PIPEBDSL);
unsigned long timeout = jiffies + msecs_to_jiffies(100);
u32 last_line;
/* Wait for the display line to settle */
do {
last_line = I915_READ(pipedsl_reg) & DSL_LINEMASK;
mdelay(5);
} while (((I915_READ(pipedsl_reg) & DSL_LINEMASK) != last_line) &&
time_after(timeout, jiffies));
if (time_after(jiffies, timeout))
DRM_DEBUG_KMS("vblank wait timed out\n");
}
/* Parameters have changed, update FBC info */
@ -1057,8 +1097,6 @@ void i8xx_disable_fbc(struct drm_device *dev)
return;
}
intel_wait_for_vblank(dev);
DRM_DEBUG_KMS("disabled FBC\n");
}
@ -1115,7 +1153,6 @@ void g4x_disable_fbc(struct drm_device *dev)
dpfc_ctl = I915_READ(DPFC_CONTROL);
dpfc_ctl &= ~DPFC_CTL_EN;
I915_WRITE(DPFC_CONTROL, dpfc_ctl);
intel_wait_for_vblank(dev);
DRM_DEBUG_KMS("disabled FBC\n");
}
@ -1176,7 +1213,6 @@ void ironlake_disable_fbc(struct drm_device *dev)
dpfc_ctl = I915_READ(ILK_DPFC_CONTROL);
dpfc_ctl &= ~DPFC_CTL_EN;
I915_WRITE(ILK_DPFC_CONTROL, dpfc_ctl);
intel_wait_for_vblank(dev);
DRM_DEBUG_KMS("disabled FBC\n");
}
@ -1475,7 +1511,7 @@ intel_pipe_set_base_atomic(struct drm_crtc *crtc, struct drm_framebuffer *fb,
if ((IS_I965G(dev) || plane == 0))
intel_update_fbc(crtc, &crtc->mode);
intel_wait_for_vblank(dev);
intel_wait_for_vblank(dev, intel_crtc->pipe);
intel_increase_pllclock(crtc, true);
return 0;
@ -1593,7 +1629,7 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
if ((IS_I965G(dev) || plane == 0))
intel_update_fbc(crtc, &crtc->mode);
intel_wait_for_vblank(dev);
intel_wait_for_vblank(dev, pipe);
if (old_fb) {
intel_fb = to_intel_framebuffer(old_fb);
@ -2343,10 +2379,8 @@ static void i9xx_crtc_dpms(struct drm_crtc *crtc, int mode)
I915_READ(dspbase_reg);
}
if (!IS_I9XX(dev)) {
/* Wait for vblank for the disable to take effect */
intel_wait_for_vblank(dev);
}
/* Wait for vblank for the disable to take effect */
intel_wait_for_vblank_off(dev, pipe);
/* Don't disable pipe A or pipe A PLLs if needed */
if (pipeconf_reg == PIPEACONF &&
@ -2361,7 +2395,7 @@ static void i9xx_crtc_dpms(struct drm_crtc *crtc, int mode)
}
/* Wait for vblank for the disable to take effect. */
intel_wait_for_vblank(dev);
intel_wait_for_vblank_off(dev, pipe);
temp = I915_READ(dpll_reg);
if ((temp & DPLL_VCO_ENABLE) != 0) {
@ -4096,7 +4130,7 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
I915_WRITE(pipeconf_reg, pipeconf);
I915_READ(pipeconf_reg);
intel_wait_for_vblank(dev);
intel_wait_for_vblank(dev, pipe);
if (IS_IRONLAKE(dev)) {
/* enable address swizzle for tiling buffer */
@ -4508,7 +4542,7 @@ struct drm_crtc *intel_get_load_detect_pipe(struct intel_encoder *intel_encoder,
encoder_funcs->commit(encoder);
}
/* let the connector get through one full cycle before testing */
intel_wait_for_vblank(dev);
intel_wait_for_vblank(dev, intel_crtc->pipe);
return crtc;
}
@ -4713,7 +4747,7 @@ static void intel_increase_pllclock(struct drm_crtc *crtc, bool schedule)
dpll &= ~DISPLAY_RATE_SELECT_FPA1;
I915_WRITE(dpll_reg, dpll);
dpll = I915_READ(dpll_reg);
intel_wait_for_vblank(dev);
intel_wait_for_vblank(dev, pipe);
dpll = I915_READ(dpll_reg);
if (dpll & DISPLAY_RATE_SELECT_FPA1)
DRM_DEBUG_DRIVER("failed to upclock LVDS!\n");
@ -4757,7 +4791,7 @@ static void intel_decrease_pllclock(struct drm_crtc *crtc)
dpll |= DISPLAY_RATE_SELECT_FPA1;
I915_WRITE(dpll_reg, dpll);
dpll = I915_READ(dpll_reg);
intel_wait_for_vblank(dev);
intel_wait_for_vblank(dev, pipe);
dpll = I915_READ(dpll_reg);
if (!(dpll & DISPLAY_RATE_SELECT_FPA1))
DRM_DEBUG_DRIVER("failed to downclock LVDS!\n");

3
drivers/gpu/drm/i915/intel_dp.c
View File

@ -1145,12 +1145,13 @@ intel_dp_set_link_train(struct intel_dp *intel_dp,
{
struct drm_device *dev = intel_dp->base.enc.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *intel_crtc = to_intel_crtc(intel_dp->base.enc.crtc);
int ret;
I915_WRITE(intel_dp->output_reg, dp_reg_value);
POSTING_READ(intel_dp->output_reg);
if (first)
intel_wait_for_vblank(dev);
intel_wait_for_vblank(dev, intel_crtc->pipe);
intel_dp_aux_native_write_1(intel_dp,
DP_TRAINING_PATTERN_SET,

3
drivers/gpu/drm/i915/intel_drv.h
View File

@ -219,7 +219,8 @@ extern struct drm_display_mode *intel_crtc_mode_get(struct drm_device *dev,
struct drm_crtc *crtc);
int intel_get_pipe_from_crtc_id(struct drm_device *dev, void *data,
struct drm_file *file_priv);
extern void intel_wait_for_vblank(struct drm_device *dev);
extern void intel_wait_for_vblank_off(struct drm_device *dev, int pipe);
extern void intel_wait_for_vblank(struct drm_device *dev, int pipe);
extern struct drm_crtc *intel_get_crtc_from_pipe(struct drm_device *dev, int pipe);
extern struct drm_crtc *intel_get_load_detect_pipe(struct intel_encoder *intel_encoder,
struct drm_connector *connector,

3
drivers/gpu/drm/i915/intel_sdvo.c
View File

@ -1218,6 +1218,7 @@ static void intel_sdvo_dpms(struct drm_encoder *encoder, int mode)
struct drm_device *dev = encoder->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_sdvo *intel_sdvo = enc_to_intel_sdvo(encoder);
struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
u32 temp;
if (mode != DRM_MODE_DPMS_ON) {
@ -1240,7 +1241,7 @@ static void intel_sdvo_dpms(struct drm_encoder *encoder, int mode)
if ((temp & SDVO_ENABLE) == 0)
intel_sdvo_write_sdvox(intel_sdvo, temp | SDVO_ENABLE);
for (i = 0; i < 2; i++)
intel_wait_for_vblank(dev);
intel_wait_for_vblank(dev, intel_crtc->pipe);
status = intel_sdvo_get_trained_inputs(intel_sdvo, &input1, &input2);
/* Warn if the device reported failure to sync.

9
drivers/gpu/drm/i915/intel_tv.c
View File

@ -1158,11 +1158,11 @@ intel_tv_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode,
/* Wait for vblank for the disable to take effect */
if (!IS_I9XX(dev))
intel_wait_for_vblank(dev);
intel_wait_for_vblank(dev, intel_crtc->pipe);
I915_WRITE(pipeconf_reg, pipeconf & ~PIPEACONF_ENABLE);
/* Wait for vblank for the disable to take effect. */
intel_wait_for_vblank(dev);
intel_wait_for_vblank(dev, intel_crtc->pipe);
/* Filter ctl must be set before TV_WIN_SIZE */
I915_WRITE(TV_FILTER_CTL_1, TV_AUTO_SCALE);
@ -1231,6 +1231,7 @@ intel_tv_detect_type (struct intel_tv *intel_tv)
struct drm_encoder *encoder = &intel_tv->base.enc;
struct drm_device *dev = encoder->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
unsigned long irqflags;
u32 tv_ctl, save_tv_ctl;
u32 tv_dac, save_tv_dac;
@ -1267,11 +1268,11 @@ intel_tv_detect_type (struct intel_tv *intel_tv)
DAC_C_0_7_V);
I915_WRITE(TV_CTL, tv_ctl);
I915_WRITE(TV_DAC, tv_dac);
intel_wait_for_vblank(dev);
intel_wait_for_vblank(dev, intel_crtc->pipe);
tv_dac = I915_READ(TV_DAC);
I915_WRITE(TV_DAC, save_tv_dac);
I915_WRITE(TV_CTL, save_tv_ctl);
intel_wait_for_vblank(dev);
intel_wait_for_vblank(dev, intel_crtc->pipe);
/*
* A B C
* 0 1 1 Composite