[Intel-gfx] [PATCH 3/3] drm/i915: Fix frame start delay programming

Shankar, Uma uma.shankar at intel.com
Fri Nov 15 16:08:45 UTC 2019



>-----Original Message-----
>From: Intel-gfx <intel-gfx-bounces at lists.freedesktop.org> On Behalf Of Ville Syrjala
>Sent: Thursday, October 24, 2019 5:52 PM
>To: intel-gfx at lists.freedesktop.org
>Subject: [Intel-gfx] [PATCH 3/3] drm/i915: Fix frame start delay programming
>
>From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
>Currently we're blindly poking at the frame start delay bits in PIPECONF when trying to
>sanitize the hardware state. Those bits decided to move elsewhere on HSW, so on
>many platforms we're not doing anything at all here. Also we're forgetting about the
>PCH transcoder entirely.
>
>Add all the bit definitions for the various homes these bits have had throughout the
>years, and reset them all to zero.
>
>However I'm not entirely sure this is a safe thing to do. If not I guess we'd want full
>readout+statecheck for this stuff.
>For now let's stick to the current logic and hope for the best.
>
>Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
>---
> drivers/gpu/drm/i915/display/intel_display.c | 101 ++++++++++++++++---
> drivers/gpu/drm/i915/i915_reg.h              |  12 ++-
> drivers/gpu/drm/i915/intel_pm.c              |   1 -
> 3 files changed, 95 insertions(+), 19 deletions(-)
>
>diff --git a/drivers/gpu/drm/i915/display/intel_display.c
>b/drivers/gpu/drm/i915/display/intel_display.c
>index 579655675b08..2896cf864f61 100644
>--- a/drivers/gpu/drm/i915/display/intel_display.c
>+++ b/drivers/gpu/drm/i915/display/intel_display.c
>@@ -1645,11 +1645,16 @@ static void ironlake_enable_pch_transcoder(const struct
>intel_crtc_state *crtc_s
> 	assert_fdi_rx_enabled(dev_priv, pipe);
>
> 	if (HAS_PCH_CPT(dev_priv)) {
>-		/* Workaround: Set the timing override bit before enabling the
>-		 * pch transcoder. */
> 		reg = TRANS_CHICKEN2(pipe);
> 		val = I915_READ(reg);
>+		/*
>+		 * Workaround: Set the timing override bit
>+		 * before enabling the pch transcoder.
>+		 */
> 		val |= TRANS_CHICKEN2_TIMING_OVERRIDE;
>+		/* Configure frame start delay to match the CPU */
>+		val &= ~TRANS_CHICKEN2_FRAME_START_DELAY_MASK;
>+		val |= TRANS_CHICKEN2_FRAME_START_DELAY(0);
> 		I915_WRITE(reg, val);
> 	}
>
>@@ -1658,6 +1663,10 @@ static void ironlake_enable_pch_transcoder(const struct
>intel_crtc_state *crtc_s
> 	pipeconf_val = I915_READ(PIPECONF(pipe));
>
> 	if (HAS_PCH_IBX(dev_priv)) {
>+		/* Configure frame start delay to match the CPU */
>+		val &= ~TRANS_FRAME_START_DELAY_MASK;
>+		val |= TRANS_FRAME_START_DELAY(0);
>+
> 		/*
> 		 * Make the BPC in transcoder be consistent with
> 		 * that in pipeconf reg. For HDMI we must use 8bpc @@ -1695,9
>+1704,12 @@ static void lpt_enable_pch_transcoder(struct drm_i915_private
>*dev_priv,
> 	assert_fdi_tx_enabled(dev_priv, (enum pipe) cpu_transcoder);
> 	assert_fdi_rx_enabled(dev_priv, PIPE_A);
>
>+	val = I915_READ(TRANS_CHICKEN2(PIPE_A));
> 	/* Workaround: set timing override bit. */
>-	val = I915_READ(TRANS_CHICKEN2(PIPE_A));
> 	val |= TRANS_CHICKEN2_TIMING_OVERRIDE;
>+	/* Configure frame start delay to match the CPU */
>+	val &= ~TRANS_CHICKEN2_FRAME_START_DELAY_MASK;
>+	val |= TRANS_CHICKEN2_FRAME_START_DELAY(0);
> 	I915_WRITE(TRANS_CHICKEN2(PIPE_A), val);
>
> 	val = TRANS_ENABLE;
>@@ -6452,6 +6464,19 @@ static void icl_pipe_mbus_enable(struct intel_crtc *crtc)
> 	I915_WRITE(PIPE_MBUS_DBOX_CTL(pipe), val);  }
>
>+static void hsw_set_frame_start_delay(const struct intel_crtc_state
>+*crtc_state) {
>+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
>+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
>+	i915_reg_t reg = CHICKEN_TRANS(crtc_state->cpu_transcoder);
>+	u32 val;
>+
>+	val = I915_READ(reg);
>+	val &= ~HSW_FRAME_START_DELAY_MASK;
>+	val |= HSW_FRAME_START_DELAY(0);
>+	I915_WRITE(reg, val);
>+}
>+
> static void haswell_crtc_enable(struct intel_crtc_state *pipe_config,
> 				struct intel_atomic_state *state)
> {
>@@ -6494,8 +6519,10 @@ static void haswell_crtc_enable(struct intel_crtc_state
>*pipe_config,
> 					     &pipe_config->fdi_m_n, NULL);
> 	}
>
>-	if (!transcoder_is_dsi(cpu_transcoder))
>+	if (!transcoder_is_dsi(cpu_transcoder)) {
>+		hsw_set_frame_start_delay(pipe_config);
> 		haswell_set_pipeconf(pipe_config);
>+	}
>
> 	if (INTEL_GEN(dev_priv) >= 9 || IS_BROADWELL(dev_priv))
> 		bdw_set_pipemisc(pipe_config);
>@@ -8394,6 +8421,8 @@ static void i9xx_set_pipeconf(const struct intel_crtc_state
>*crtc_state)
>
> 	pipeconf |= PIPECONF_GAMMA_MODE(crtc_state->gamma_mode);
>
>+	pipeconf |= PIPECONF_FRAME_START_DELAY(0);
>+
> 	I915_WRITE(PIPECONF(crtc->pipe), pipeconf);
> 	POSTING_READ(PIPECONF(crtc->pipe));
> }
>@@ -9474,6 +9503,8 @@ static void ironlake_set_pipeconf(const struct
>intel_crtc_state *crtc_state)
>
> 	val |= PIPECONF_GAMMA_MODE(crtc_state->gamma_mode);
>
>+	val |= PIPECONF_FRAME_START_DELAY(0);
>+
> 	I915_WRITE(PIPECONF(pipe), val);
> 	POSTING_READ(PIPECONF(pipe));
> }
>@@ -16919,25 +16950,69 @@ static bool has_pch_trancoder(struct
>drm_i915_private *dev_priv,
> 		(HAS_PCH_LPT_H(dev_priv) && pch_transcoder == PIPE_A);  }
>
>+static void intel_sanitize_frame_start_delay(const struct
>+intel_crtc_state *crtc_state) {
>+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
>+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
>+	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
>+
>+	if (INTEL_GEN(dev_priv) >= 9 ||
>+	    IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv)) {
>+		i915_reg_t reg = CHICKEN_TRANS(cpu_transcoder);
>+		u32 val;
>+
>+		if (transcoder_is_dsi(cpu_transcoder))
>+			return;
>+
>+		val = I915_READ(reg);
>+		val &= ~HSW_FRAME_START_DELAY_MASK;
>+		val |= HSW_FRAME_START_DELAY(0);
>+		I915_WRITE(reg, val);
>+	} else {
>+		i915_reg_t reg = PIPECONF(cpu_transcoder);
>+		u32 val;
>+
>+		val = I915_READ(reg);
>+		val &= ~PIPECONF_FRAME_START_DELAY_MASK;
>+		val |= PIPECONF_FRAME_START_DELAY(0);
>+		I915_WRITE(reg, val);
>+	}
>+
>+	if (!crtc_state->has_pch_encoder)
>+		return;
>+
>+	if (HAS_PCH_IBX(dev_priv)) {
>+		i915_reg_t reg = PCH_TRANSCONF(crtc->pipe);
>+		u32 val;
>+
>+		val = I915_READ(reg);
>+		val &= ~TRANS_FRAME_START_DELAY_MASK;
>+		val |= TRANS_FRAME_START_DELAY(0);
>+		I915_WRITE(reg, val);
>+	} else {
>+		i915_reg_t reg = TRANS_CHICKEN2(crtc->pipe);
>+		u32 val;
>+
>+		val = I915_READ(reg);
>+		val &= ~TRANS_CHICKEN2_FRAME_START_DELAY_MASK;
>+		val |= TRANS_CHICKEN2_FRAME_START_DELAY(0);
>+		I915_WRITE(reg, val);
>+	}
>+}
>+
> static void intel_sanitize_crtc(struct intel_crtc *crtc,
> 				struct drm_modeset_acquire_ctx *ctx)  {
> 	struct drm_device *dev = crtc->base.dev;
> 	struct drm_i915_private *dev_priv = to_i915(dev);
> 	struct intel_crtc_state *crtc_state = to_intel_crtc_state(crtc->base.state);
>-	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
>-
>-	/* Clear any frame start delays used for debugging left by the BIOS */
>-	if (crtc->active && !transcoder_is_dsi(cpu_transcoder)) {
>-		i915_reg_t reg = PIPECONF(cpu_transcoder);
>-
>-		I915_WRITE(reg,
>-			   I915_READ(reg) &
>~PIPECONF_FRAME_START_DELAY_MASK);
>-	}
>
> 	if (crtc_state->base.active) {
> 		struct intel_plane *plane;
>
>+		/* Clear any frame start delays used for debugging left by the BIOS */
>+		intel_sanitize_frame_start_delay(crtc_state);
>+
> 		/* Disable everything but the primary plane */
> 		for_each_intel_plane_on_crtc(dev, crtc, plane) {
> 			const struct intel_plane_state *plane_state = diff --git
>a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index
>50c2fa0f2cab..cb2e0f4679c4 100644
>--- a/drivers/gpu/drm/i915/i915_reg.h
>+++ b/drivers/gpu/drm/i915/i915_reg.h
>@@ -5671,7 +5671,8 @@ enum {
> #define   PIPECONF_DOUBLE_WIDE	(1 << 30)
> #define   I965_PIPECONF_ACTIVE	(1 << 30)
> #define   PIPECONF_DSI_PLL_LOCKED	(1 << 29) /* vlv & pipe A only */
>-#define   PIPECONF_FRAME_START_DELAY_MASK (3 << 27)
>+#define   PIPECONF_FRAME_START_DELAY_MASK	(3 << 27) /* pre-hsw */
>+#define   PIPECONF_FRAME_START_DELAY(x)		((x) << 27) /* pre-hsw: 0-3
>*/
> #define   PIPECONF_SINGLE_WIDE	0
> #define   PIPECONF_PIPE_UNLOCKED 0
> #define   PIPECONF_PIPE_LOCKED	(1 << 25)
>@@ -7627,6 +7628,8 @@ enum {
> 					    [TRANSCODER_B] = _CHICKEN_TRANS_B,
>\
> 					    [TRANSCODER_C] = _CHICKEN_TRANS_C,
>\
> 					    [TRANSCODER_D] =
>_CHICKEN_TRANS_D))
>+#define  HSW_FRAME_START_DELAY_MASK	(3 << 27)
>+#define  HSW_FRAME_START_DELAY(x)	((x) << 27) /* 0-3 */
> #define  VSC_DATA_SEL_SOFTWARE_CONTROL	(1 << 25) /* GLK and CNL+ */
> #define  DDI_TRAINING_OVERRIDE_ENABLE	(1 << 19)
> #define  DDI_TRAINING_OVERRIDE_VALUE	(1 << 18)
>@@ -8341,10 +8344,8 @@ enum {
> #define  TRANS_STATE_MASK       (1 << 30)
> #define  TRANS_STATE_DISABLE    (0 << 30)
> #define  TRANS_STATE_ENABLE     (1 << 30)
>-#define  TRANS_FSYNC_DELAY_HB1  (0 << 27) -#define  TRANS_FSYNC_DELAY_HB2
>(1 << 27) -#define  TRANS_FSYNC_DELAY_HB3  (2 << 27) -#define
>TRANS_FSYNC_DELAY_HB4  (3 << 27)
>+#define  TRANS_FRAME_START_DELAY_MASK	(3 << 27) /* ibx */
>+#define  TRANS_FRAME_START_DELAY(x)	((x) << 27) /* ibx: 0-3 */
> #define  TRANS_INTERLACE_MASK   (7 << 21)
> #define  TRANS_PROGRESSIVE      (0 << 21)
> #define  TRANS_INTERLACED       (3 << 21)
>@@ -8365,6 +8366,7 @@ enum {
> #define  TRANS_CHICKEN2_TIMING_OVERRIDE			(1 << 31)
> #define  TRANS_CHICKEN2_FDI_POLARITY_REVERSED		(1 << 29)
> #define  TRANS_CHICKEN2_FRAME_START_DELAY_MASK		(3 << 27)
>+#define  TRANS_CHICKEN2_FRAME_START_DELAY(x)		((x) << 27) /* 0-3 */
> #define  TRANS_CHICKEN2_DISABLE_DEEP_COLOR_COUNTER	(1 << 26)
> #define  TRANS_CHICKEN2_DISABLE_DEEP_COLOR_MODESWITCH	(1 << 25)
>
>diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index
>362234449087..8b1fbdb36537 100644
>--- a/drivers/gpu/drm/i915/intel_pm.c
>+++ b/drivers/gpu/drm/i915/intel_pm.c
>@@ -8079,7 +8079,6 @@ static void cpt_init_clock_gating(struct drm_i915_private
>*dev_priv)
> 		val &= ~TRANS_CHICKEN2_FDI_POLARITY_REVERSED;
> 		if (dev_priv->vbt.fdi_rx_polarity_inverted)
> 			val |= TRANS_CHICKEN2_FDI_POLARITY_REVERSED;
>-		val &= ~TRANS_CHICKEN2_FRAME_START_DELAY_MASK;

Is there any reason not to let it be set at 0.

Overall, I looked at the register and bit definitions for various platforms and this looks
a very reasonable change rectifying the frame start delay programming.

However I am not sure if for all platforms 0 will be the preferred value. If the default values
of these bits are 0 in hardware register (or the BIOS set them at 0 itself), this should
work seamlessly. Only caveat will be if the defaults are not 0 on all platforms, we may have
issues. 

Good way to figure this out I guess is our CI results. So if the CI passes, this is
Reviewed-by: Uma Shankar <uma.shankar at intel.com>

> 		val &= ~TRANS_CHICKEN2_DISABLE_DEEP_COLOR_COUNTER;
> 		val &= ~TRANS_CHICKEN2_DISABLE_DEEP_COLOR_MODESWITCH;
> 		I915_WRITE(TRANS_CHICKEN2(pipe), val);
>--
>2.21.0
>
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