From 9d0498a2bf7455159b317f19531a3e5db2ecc9c4 Mon Sep 17 00:00:00 2001 From: Jesse Barnes Date: Wed, 18 Aug 2010 13:20:54 -0700 Subject: [PATCH] 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 Signed-off-by: Eric Anholt --- drivers/gpu/drm/i915/i915_reg.h | 1 + drivers/gpu/drm/i915/intel_crt.c | 2 +- drivers/gpu/drm/i915/intel_display.c | 78 ++++++++++++++++++++-------- drivers/gpu/drm/i915/intel_dp.c | 3 +- drivers/gpu/drm/i915/intel_drv.h | 3 +- drivers/gpu/drm/i915/intel_sdvo.c | 3 +- drivers/gpu/drm/i915/intel_tv.c | 9 ++-- 7 files changed, 69 insertions(+), 30 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index a63e9a176386..67e3ec1a6af9 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -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 diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c index c43176d77549..eb31fdf758e8 100644 --- a/drivers/gpu/drm/i915/intel_crt.c +++ b/drivers/gpu/drm/i915/intel_crt.c @@ -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 : diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 14c45b1e8778..bdea9464b678 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -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"); diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index caaaa8f9db3e..9caccd03dccb 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -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, diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index 6ba56e1796ce..0e92aa07b382 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -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, diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c index 5c765bb0845d..093e914e8a41 100644 --- a/drivers/gpu/drm/i915/intel_sdvo.c +++ b/drivers/gpu/drm/i915/intel_sdvo.c @@ -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. diff --git a/drivers/gpu/drm/i915/intel_tv.c b/drivers/gpu/drm/i915/intel_tv.c index 1bd6e8795011..d2029efee982 100644 --- a/drivers/gpu/drm/i915/intel_tv.c +++ b/drivers/gpu/drm/i915/intel_tv.c @@ -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