diff mbox series

[OEM,Artful] drm/i915: Apply Display WA #1183 on skl, kbl, and cfl

Message ID 1522207258-10046-2-git-send-email-acelan.kao@canonical.com
State New
Headers show
Series [OEM,Artful] drm/i915: Apply Display WA #1183 on skl, kbl, and cfl | expand

Commit Message

AceLan Kao March 28, 2018, 3:20 a.m. UTC 
From: Lucas De Marchi <lucas.demarchi@intel.com>

BugLink: https://launchpad.net/bugs/1759188

Display WA #1183 was recently added to workaround
"Failures when enabling DPLL0 with eDP link rate 2.16
or 4.32 GHz and CD clock frequency 308.57 or 617.14 MHz
(CDCLK_CTL CD Frequency Select 10b or 11b) used in this
 enabling or in previous enabling."

This workaround was designed to minimize the impact only
to save the bad case with that link rates. But HW engineers
indicated that it should be safe to apply broadly, although
they were expecting the DPLL0 link rate to be unchanged on
runtime.

We need to cover 2 cases: when we are in fact enabling DPLL0
and when we are just changing the frequency with small
differences.

This is based on previous patch by Rodrigo Vivi with suggestions
from Ville Syrjälä.

Cc: Arthur J Runyan <arthur.j.runyan@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171204232210.4958-1-lucas.demarchi@intel.com
(cherry picked from commit 53421c2fe99ce16838639ad89d772d914a119a49)
[ Lucas: Backport to 4.15 adding back variable that has been removed on
  commits not meant to be backported ]
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180102201837.6812-1-lucas.demarchi@intel.com

(cherry picked from commit 30414f3010aff95ffdb6bed7b9dce62cde94fdc7)
Signed-off-by: AceLan Kao <acelan.kao@canonical.com>
---
 drivers/gpu/drm/i915/i915_reg.h         |  2 ++
 drivers/gpu/drm/i915/intel_cdclk.c      | 35 ++++++++++++++++++++++++---------
 drivers/gpu/drm/i915/intel_runtime_pm.c | 10 ++++++++++
 3 files changed, 38 insertions(+), 9 deletions(-)

Comments

Stefan Bader March 28, 2018, 12:39 p.m. UTC | #1 
On 28.03.2018 05:20, AceLan Kao wrote:
> From: Lucas De Marchi <lucas.demarchi@intel.com>
> 
> BugLink: https://launchpad.net/bugs/1759188
> 
> Display WA #1183 was recently added to workaround
> "Failures when enabling DPLL0 with eDP link rate 2.16
> or 4.32 GHz and CD clock frequency 308.57 or 617.14 MHz
> (CDCLK_CTL CD Frequency Select 10b or 11b) used in this
>  enabling or in previous enabling."
> 
> This workaround was designed to minimize the impact only
> to save the bad case with that link rates. But HW engineers
> indicated that it should be safe to apply broadly, although
> they were expecting the DPLL0 link rate to be unchanged on
> runtime.
> 
> We need to cover 2 cases: when we are in fact enabling DPLL0
> and when we are just changing the frequency with small
> differences.
> 
> This is based on previous patch by Rodrigo Vivi with suggestions
> from Ville Syrjälä.
> 
> Cc: Arthur J Runyan <arthur.j.runyan@intel.com>
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Cc: stable@vger.kernel.org
> Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Link: https://patchwork.freedesktop.org/patch/msgid/20171204232210.4958-1-lucas.demarchi@intel.com
> (cherry picked from commit 53421c2fe99ce16838639ad89d772d914a119a49)
> [ Lucas: Backport to 4.15 adding back variable that has been removed on
>   commits not meant to be backported ]
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> Link: https://patchwork.freedesktop.org/patch/msgid/20180102201837.6812-1-lucas.demarchi@intel.com
> 
> (cherry picked from commit 30414f3010aff95ffdb6bed7b9dce62cde94fdc7)
> Signed-off-by: AceLan Kao <acelan.kao@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>

> ---

This seems to have been part of 4.15-rc7 so should be included in Bionic already.

>  drivers/gpu/drm/i915/i915_reg.h         |  2 ++
>  drivers/gpu/drm/i915/intel_cdclk.c      | 35 ++++++++++++++++++++++++---------
>  drivers/gpu/drm/i915/intel_runtime_pm.c | 10 ++++++++++
>  3 files changed, 38 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 91b1e92..c53d369 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -6748,6 +6748,7 @@ enum {
>  #define  RESET_PCH_HANDSHAKE_ENABLE	(1<<4)
>  
>  #define GEN8_CHICKEN_DCPR_1		_MMIO(0x46430)
> +#define   SKL_SELECT_ALTERNATE_DC_EXIT	(1<<30)
>  #define   MASK_WAKEMEM			(1<<13)
>  
>  #define SKL_DFSM			_MMIO(0x51000)
> @@ -8256,6 +8257,7 @@ enum {
>  #define  BXT_CDCLK_CD2X_DIV_SEL_2	(2<<22)
>  #define  BXT_CDCLK_CD2X_DIV_SEL_4	(3<<22)
>  #define  BXT_CDCLK_CD2X_PIPE(pipe)	((pipe)<<20)
> +#define  CDCLK_DIVMUX_CD_OVERRIDE	(1<<19)
>  #define  BXT_CDCLK_CD2X_PIPE_NONE	BXT_CDCLK_CD2X_PIPE(3)
>  #define  BXT_CDCLK_SSA_PRECHARGE_ENABLE	(1<<16)
>  #define  CDCLK_FREQ_DECIMAL_MASK	(0x7ff)
> diff --git a/drivers/gpu/drm/i915/intel_cdclk.c b/drivers/gpu/drm/i915/intel_cdclk.c
> index b156032..7ca6f4f 100644
> --- a/drivers/gpu/drm/i915/intel_cdclk.c
> +++ b/drivers/gpu/drm/i915/intel_cdclk.c
> @@ -856,16 +856,10 @@ static void skl_set_preferred_cdclk_vco(struct drm_i915_private *dev_priv,
>  
>  static void skl_dpll0_enable(struct drm_i915_private *dev_priv, int vco)
>  {
> -	int min_cdclk = skl_calc_cdclk(0, vco);
>  	u32 val;
>  
>  	WARN_ON(vco != 8100000 && vco != 8640000);
>  
> -	/* select the minimum CDCLK before enabling DPLL 0 */
> -	val = CDCLK_FREQ_337_308 | skl_cdclk_decimal(min_cdclk);
> -	I915_WRITE(CDCLK_CTL, val);
> -	POSTING_READ(CDCLK_CTL);
> -
>  	/*
>  	 * We always enable DPLL0 with the lowest link rate possible, but still
>  	 * taking into account the VCO required to operate the eDP panel at the
> @@ -919,7 +913,7 @@ static void skl_set_cdclk(struct drm_i915_private *dev_priv,
>  {
>  	int cdclk = cdclk_state->cdclk;
>  	int vco = cdclk_state->vco;
> -	u32 freq_select, pcu_ack;
> +	u32 freq_select, pcu_ack, cdclk_ctl;
>  	int ret;
>  
>  	WARN_ON((cdclk == 24000) != (vco == 0));
> @@ -936,7 +930,7 @@ static void skl_set_cdclk(struct drm_i915_private *dev_priv,
>  		return;
>  	}
>  
> -	/* set CDCLK_CTL */
> +	/* Choose frequency for this cdclk */
>  	switch (cdclk) {
>  	case 450000:
>  	case 432000:
> @@ -964,10 +958,33 @@ static void skl_set_cdclk(struct drm_i915_private *dev_priv,
>  	    dev_priv->cdclk.hw.vco != vco)
>  		skl_dpll0_disable(dev_priv);
>  
> +	cdclk_ctl = I915_READ(CDCLK_CTL);
> +
> +	if (dev_priv->cdclk.hw.vco != vco) {
> +		/* Wa Display #1183: skl,kbl,cfl */
> +		cdclk_ctl &= ~(CDCLK_FREQ_SEL_MASK | CDCLK_FREQ_DECIMAL_MASK);
> +		cdclk_ctl |= freq_select | skl_cdclk_decimal(cdclk);
> +		I915_WRITE(CDCLK_CTL, cdclk_ctl);
> +	}
> +
> +	/* Wa Display #1183: skl,kbl,cfl */
> +	cdclk_ctl |= CDCLK_DIVMUX_CD_OVERRIDE;
> +	I915_WRITE(CDCLK_CTL, cdclk_ctl);
> +	POSTING_READ(CDCLK_CTL);
> +
>  	if (dev_priv->cdclk.hw.vco != vco)
>  		skl_dpll0_enable(dev_priv, vco);
>  
> -	I915_WRITE(CDCLK_CTL, freq_select | skl_cdclk_decimal(cdclk));
> +	/* Wa Display #1183: skl,kbl,cfl */
> +	cdclk_ctl &= ~(CDCLK_FREQ_SEL_MASK | CDCLK_FREQ_DECIMAL_MASK);
> +	I915_WRITE(CDCLK_CTL, cdclk_ctl);
> +
> +	cdclk_ctl |= freq_select | skl_cdclk_decimal(cdclk);
> +	I915_WRITE(CDCLK_CTL, cdclk_ctl);
> +
> +	/* Wa Display #1183: skl,kbl,cfl */
> +	cdclk_ctl &= ~CDCLK_DIVMUX_CD_OVERRIDE;
> +	I915_WRITE(CDCLK_CTL, cdclk_ctl);
>  	POSTING_READ(CDCLK_CTL);
>  
>  	/* inform PCU of the change */
> diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
> index 5eb9c5e..efe8227 100644
> --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
> +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
> @@ -769,6 +769,11 @@ void gen9_enable_dc5(struct drm_i915_private *dev_priv)
>  
>  	DRM_DEBUG_KMS("Enabling DC5\n");
>  
> +	/* Wa Display #1183: skl,kbl,cfl */
> +	if (IS_GEN9_BC(dev_priv))
> +		I915_WRITE(GEN8_CHICKEN_DCPR_1, I915_READ(GEN8_CHICKEN_DCPR_1) |
> +			   SKL_SELECT_ALTERNATE_DC_EXIT);
> +
>  	gen9_set_dc_state(dev_priv, DC_STATE_EN_UPTO_DC5);
>  }
>  
> @@ -796,6 +801,11 @@ void skl_disable_dc6(struct drm_i915_private *dev_priv)
>  {
>  	DRM_DEBUG_KMS("Disabling DC6\n");
>  
> +	/* Wa Display #1183: skl,kbl,cfl */
> +	if (IS_GEN9_BC(dev_priv))
> +		I915_WRITE(GEN8_CHICKEN_DCPR_1, I915_READ(GEN8_CHICKEN_DCPR_1) |
> +			   SKL_SELECT_ALTERNATE_DC_EXIT);
> +
>  	gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
>  }
>  
>
diff mbox series

Patch

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 91b1e92..c53d369 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6748,6 +6748,7 @@  enum {
 #define  RESET_PCH_HANDSHAKE_ENABLE	(1<<4)
 
 #define GEN8_CHICKEN_DCPR_1		_MMIO(0x46430)
+#define   SKL_SELECT_ALTERNATE_DC_EXIT	(1<<30)
 #define   MASK_WAKEMEM			(1<<13)
 
 #define SKL_DFSM			_MMIO(0x51000)
@@ -8256,6 +8257,7 @@  enum {
 #define  BXT_CDCLK_CD2X_DIV_SEL_2	(2<<22)
 #define  BXT_CDCLK_CD2X_DIV_SEL_4	(3<<22)
 #define  BXT_CDCLK_CD2X_PIPE(pipe)	((pipe)<<20)
+#define  CDCLK_DIVMUX_CD_OVERRIDE	(1<<19)
 #define  BXT_CDCLK_CD2X_PIPE_NONE	BXT_CDCLK_CD2X_PIPE(3)
 #define  BXT_CDCLK_SSA_PRECHARGE_ENABLE	(1<<16)
 #define  CDCLK_FREQ_DECIMAL_MASK	(0x7ff)
diff --git a/drivers/gpu/drm/i915/intel_cdclk.c b/drivers/gpu/drm/i915/intel_cdclk.c
index b156032..7ca6f4f 100644
--- a/drivers/gpu/drm/i915/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/intel_cdclk.c
@@ -856,16 +856,10 @@  static void skl_set_preferred_cdclk_vco(struct drm_i915_private *dev_priv,
 
 static void skl_dpll0_enable(struct drm_i915_private *dev_priv, int vco)
 {
-	int min_cdclk = skl_calc_cdclk(0, vco);
 	u32 val;
 
 	WARN_ON(vco != 8100000 && vco != 8640000);
 
-	/* select the minimum CDCLK before enabling DPLL 0 */
-	val = CDCLK_FREQ_337_308 | skl_cdclk_decimal(min_cdclk);
-	I915_WRITE(CDCLK_CTL, val);
-	POSTING_READ(CDCLK_CTL);
-
 	/*
 	 * We always enable DPLL0 with the lowest link rate possible, but still
 	 * taking into account the VCO required to operate the eDP panel at the
@@ -919,7 +913,7 @@  static void skl_set_cdclk(struct drm_i915_private *dev_priv,
 {
 	int cdclk = cdclk_state->cdclk;
 	int vco = cdclk_state->vco;
-	u32 freq_select, pcu_ack;
+	u32 freq_select, pcu_ack, cdclk_ctl;
 	int ret;
 
 	WARN_ON((cdclk == 24000) != (vco == 0));
@@ -936,7 +930,7 @@  static void skl_set_cdclk(struct drm_i915_private *dev_priv,
 		return;
 	}
 
-	/* set CDCLK_CTL */
+	/* Choose frequency for this cdclk */
 	switch (cdclk) {
 	case 450000:
 	case 432000:
@@ -964,10 +958,33 @@  static void skl_set_cdclk(struct drm_i915_private *dev_priv,
 	    dev_priv->cdclk.hw.vco != vco)
 		skl_dpll0_disable(dev_priv);
 
+	cdclk_ctl = I915_READ(CDCLK_CTL);
+
+	if (dev_priv->cdclk.hw.vco != vco) {
+		/* Wa Display #1183: skl,kbl,cfl */
+		cdclk_ctl &= ~(CDCLK_FREQ_SEL_MASK | CDCLK_FREQ_DECIMAL_MASK);
+		cdclk_ctl |= freq_select | skl_cdclk_decimal(cdclk);
+		I915_WRITE(CDCLK_CTL, cdclk_ctl);
+	}
+
+	/* Wa Display #1183: skl,kbl,cfl */
+	cdclk_ctl |= CDCLK_DIVMUX_CD_OVERRIDE;
+	I915_WRITE(CDCLK_CTL, cdclk_ctl);
+	POSTING_READ(CDCLK_CTL);
+
 	if (dev_priv->cdclk.hw.vco != vco)
 		skl_dpll0_enable(dev_priv, vco);
 
-	I915_WRITE(CDCLK_CTL, freq_select | skl_cdclk_decimal(cdclk));
+	/* Wa Display #1183: skl,kbl,cfl */
+	cdclk_ctl &= ~(CDCLK_FREQ_SEL_MASK | CDCLK_FREQ_DECIMAL_MASK);
+	I915_WRITE(CDCLK_CTL, cdclk_ctl);
+
+	cdclk_ctl |= freq_select | skl_cdclk_decimal(cdclk);
+	I915_WRITE(CDCLK_CTL, cdclk_ctl);
+
+	/* Wa Display #1183: skl,kbl,cfl */
+	cdclk_ctl &= ~CDCLK_DIVMUX_CD_OVERRIDE;
+	I915_WRITE(CDCLK_CTL, cdclk_ctl);
 	POSTING_READ(CDCLK_CTL);
 
 	/* inform PCU of the change */
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index 5eb9c5e..efe8227 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -769,6 +769,11 @@  void gen9_enable_dc5(struct drm_i915_private *dev_priv)
 
 	DRM_DEBUG_KMS("Enabling DC5\n");
 
+	/* Wa Display #1183: skl,kbl,cfl */
+	if (IS_GEN9_BC(dev_priv))
+		I915_WRITE(GEN8_CHICKEN_DCPR_1, I915_READ(GEN8_CHICKEN_DCPR_1) |
+			   SKL_SELECT_ALTERNATE_DC_EXIT);
+
 	gen9_set_dc_state(dev_priv, DC_STATE_EN_UPTO_DC5);
 }
 
@@ -796,6 +801,11 @@  void skl_disable_dc6(struct drm_i915_private *dev_priv)
 {
 	DRM_DEBUG_KMS("Disabling DC6\n");
 
+	/* Wa Display #1183: skl,kbl,cfl */
+	if (IS_GEN9_BC(dev_priv))
+		I915_WRITE(GEN8_CHICKEN_DCPR_1, I915_READ(GEN8_CHICKEN_DCPR_1) |
+			   SKL_SELECT_ALTERNATE_DC_EXIT);
+
 	gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
 }