drm/i915/skl: Add module parameter to select edp vswing table
diff mbox

Message ID 1430913948-4617-1-git-send-email-sonika.jindal@intel.com
State New
Headers show

Commit Message

sonika.jindal@intel.com May 6, 2015, 12:05 p.m. UTC
This provides an option to override the value set by VBT
for selecting edp Vswing Pre-emph setting table.

v2: Adding comment about this being a temporary workaround and
making the parameter read-only (Jani)
v3: Changing mode to 0400 instead of 0 (Jani)

https://bugs.freedesktop.org/show_bug.cgi?id=89554
Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h    |    4 +++-
 drivers/gpu/drm/i915/i915_params.c |    8 ++++++++
 drivers/gpu/drm/i915/intel_bios.c  |    9 +++++++--
 drivers/gpu/drm/i915/intel_ddi.c   |    2 +-
 drivers/gpu/drm/i915/intel_dp.c    |    2 +-
 5 files changed, 20 insertions(+), 5 deletions(-)

Comments

Daniel Vetter May 6, 2015, 2:09 p.m. UTC | #1
On Wed, May 06, 2015 at 05:35:48PM +0530, Sonika Jindal wrote:
> This provides an option to override the value set by VBT
> for selecting edp Vswing Pre-emph setting table.
> 
> v2: Adding comment about this being a temporary workaround and
> making the parameter read-only (Jani)
> v3: Changing mode to 0400 instead of 0 (Jani)
> 
> https://bugs.freedesktop.org/show_bug.cgi?id=89554
> Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
> Reviewed-by: Jani Nikula <jani.nikula@intel.com>

Queued for -next, thanks for the patch.
-Daniel

> ---
>  drivers/gpu/drm/i915/i915_drv.h    |    4 +++-
>  drivers/gpu/drm/i915/i915_params.c |    8 ++++++++
>  drivers/gpu/drm/i915/intel_bios.c  |    9 +++++++--
>  drivers/gpu/drm/i915/intel_ddi.c   |    2 +-
>  drivers/gpu/drm/i915/intel_dp.c    |    2 +-
>  5 files changed, 20 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 136d42a..1c3ee66 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1364,7 +1364,6 @@ struct intel_vbt_data {
>  	bool edp_initialized;
>  	bool edp_support;
>  	int edp_bpp;
> -	bool edp_low_vswing;
>  	struct edp_power_seq edp_pps;
>  
>  	struct {
> @@ -1846,6 +1845,8 @@ struct drm_i915_private {
>  		void (*stop_ring)(struct intel_engine_cs *ring);
>  	} gt;
>  
> +	bool edp_low_vswing;
> +
>  	/*
>  	 * NOTE: This is the dri1/ums dungeon, don't add stuff here. Your patch
>  	 * will be rejected. Instead look for a better place.
> @@ -2515,6 +2516,7 @@ struct i915_params {
>  	int mmio_debug;
>  	bool verbose_state_checks;
>  	bool nuclear_pageflip;
> +	int edp_vswing;
>  };
>  extern struct i915_params i915 __read_mostly;
>  
> diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
> index bb64415..8ac5a1b 100644
> --- a/drivers/gpu/drm/i915/i915_params.c
> +++ b/drivers/gpu/drm/i915/i915_params.c
> @@ -53,6 +53,7 @@ struct i915_params i915 __read_mostly = {
>  	.mmio_debug = 0,
>  	.verbose_state_checks = 1,
>  	.nuclear_pageflip = 0,
> +	.edp_vswing = 0,
>  };
>  
>  module_param_named(modeset, i915.modeset, int, 0400);
> @@ -184,3 +185,10 @@ MODULE_PARM_DESC(verbose_state_checks,
>  module_param_named_unsafe(nuclear_pageflip, i915.nuclear_pageflip, bool, 0600);
>  MODULE_PARM_DESC(nuclear_pageflip,
>  		 "Force atomic modeset functionality; only planes work for now (default: false).");
> +
> +/* WA to get away with the default setting in VBT for early platforms.Will be removed */
> +module_param_named_unsafe(edp_vswing, i915.edp_vswing, int, 0400);
> +MODULE_PARM_DESC(edp_vswing,
> +		 "Ignore/Override vswing pre-emph table selection from VBT "
> +		 "(0=use value from vbt [default], 1=low power swing(200mV),"
> +		 "2=default swing(400mV))");
> diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
> index c08368c..cee596d 100644
> --- a/drivers/gpu/drm/i915/intel_bios.c
> +++ b/drivers/gpu/drm/i915/intel_bios.c
> @@ -672,8 +672,13 @@ parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
>  	if (bdb->version >= 173) {
>  		uint8_t vswing;
>  
> -		vswing = (edp->edp_vswing_preemph >> (panel_type * 4)) & 0xF;
> -		dev_priv->vbt.edp_low_vswing = vswing == 0;
> +		/* Don't read from VBT if module parameter has valid value*/
> +		if (i915.edp_vswing) {
> +			dev_priv->edp_low_vswing = i915.edp_vswing == 1;
> +		} else {
> +			vswing = (edp->edp_vswing_preemph >> (panel_type * 4)) & 0xF;
> +			dev_priv->edp_low_vswing = vswing == 0;
> +		}
>  	}
>  }
>  
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index 9c1e74a..2539f22 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -282,7 +282,7 @@ static void intel_prepare_ddi_buffers(struct drm_device *dev, enum port port,
>  		ddi_translations_fdi = NULL;
>  		ddi_translations_dp = skl_ddi_translations_dp;
>  		n_dp_entries = ARRAY_SIZE(skl_ddi_translations_dp);
> -		if (dev_priv->vbt.edp_low_vswing) {
> +		if (dev_priv->edp_low_vswing) {
>  			ddi_translations_edp = skl_ddi_translations_edp;
>  			n_edp_entries = ARRAY_SIZE(skl_ddi_translations_edp);
>  		} else {
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index bacdec5..5f53666 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -2894,7 +2894,7 @@ intel_dp_voltage_max(struct intel_dp *intel_dp)
>  	if (IS_BROXTON(dev))
>  		return DP_TRAIN_VOLTAGE_SWING_LEVEL_3;
>  	else if (INTEL_INFO(dev)->gen >= 9) {
> -		if (dev_priv->vbt.edp_low_vswing && port == PORT_A)
> +		if (dev_priv->edp_low_vswing && port == PORT_A)
>  			return DP_TRAIN_VOLTAGE_SWING_LEVEL_3;
>  		return DP_TRAIN_VOLTAGE_SWING_LEVEL_2;
>  	} else if (IS_VALLEYVIEW(dev))
> -- 
> 1.7.10.4
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
Shuang He May 7, 2015, 12:27 p.m. UTC | #2
Tested-By: Intel Graphics QA PRTS (Patch Regression Test System Contact: shuang.he@intel.com)
Task id: 6330
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                                  276/276              276/276
ILK                                  302/302              302/302
SNB                                  316/316              316/316
IVB                                  342/342              342/342
BYT                                  286/286              286/286
BDW                                  321/321              321/321
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
Note: You need to pay more attention to line start with '*'

Patch
diff mbox

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 136d42a..1c3ee66 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1364,7 +1364,6 @@  struct intel_vbt_data {
 	bool edp_initialized;
 	bool edp_support;
 	int edp_bpp;
-	bool edp_low_vswing;
 	struct edp_power_seq edp_pps;
 
 	struct {
@@ -1846,6 +1845,8 @@  struct drm_i915_private {
 		void (*stop_ring)(struct intel_engine_cs *ring);
 	} gt;
 
+	bool edp_low_vswing;
+
 	/*
 	 * NOTE: This is the dri1/ums dungeon, don't add stuff here. Your patch
 	 * will be rejected. Instead look for a better place.
@@ -2515,6 +2516,7 @@  struct i915_params {
 	int mmio_debug;
 	bool verbose_state_checks;
 	bool nuclear_pageflip;
+	int edp_vswing;
 };
 extern struct i915_params i915 __read_mostly;
 
diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index bb64415..8ac5a1b 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -53,6 +53,7 @@  struct i915_params i915 __read_mostly = {
 	.mmio_debug = 0,
 	.verbose_state_checks = 1,
 	.nuclear_pageflip = 0,
+	.edp_vswing = 0,
 };
 
 module_param_named(modeset, i915.modeset, int, 0400);
@@ -184,3 +185,10 @@  MODULE_PARM_DESC(verbose_state_checks,
 module_param_named_unsafe(nuclear_pageflip, i915.nuclear_pageflip, bool, 0600);
 MODULE_PARM_DESC(nuclear_pageflip,
 		 "Force atomic modeset functionality; only planes work for now (default: false).");
+
+/* WA to get away with the default setting in VBT for early platforms.Will be removed */
+module_param_named_unsafe(edp_vswing, i915.edp_vswing, int, 0400);
+MODULE_PARM_DESC(edp_vswing,
+		 "Ignore/Override vswing pre-emph table selection from VBT "
+		 "(0=use value from vbt [default], 1=low power swing(200mV),"
+		 "2=default swing(400mV))");
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index c08368c..cee596d 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -672,8 +672,13 @@  parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 	if (bdb->version >= 173) {
 		uint8_t vswing;
 
-		vswing = (edp->edp_vswing_preemph >> (panel_type * 4)) & 0xF;
-		dev_priv->vbt.edp_low_vswing = vswing == 0;
+		/* Don't read from VBT if module parameter has valid value*/
+		if (i915.edp_vswing) {
+			dev_priv->edp_low_vswing = i915.edp_vswing == 1;
+		} else {
+			vswing = (edp->edp_vswing_preemph >> (panel_type * 4)) & 0xF;
+			dev_priv->edp_low_vswing = vswing == 0;
+		}
 	}
 }
 
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 9c1e74a..2539f22 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -282,7 +282,7 @@  static void intel_prepare_ddi_buffers(struct drm_device *dev, enum port port,
 		ddi_translations_fdi = NULL;
 		ddi_translations_dp = skl_ddi_translations_dp;
 		n_dp_entries = ARRAY_SIZE(skl_ddi_translations_dp);
-		if (dev_priv->vbt.edp_low_vswing) {
+		if (dev_priv->edp_low_vswing) {
 			ddi_translations_edp = skl_ddi_translations_edp;
 			n_edp_entries = ARRAY_SIZE(skl_ddi_translations_edp);
 		} else {
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index bacdec5..5f53666 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2894,7 +2894,7 @@  intel_dp_voltage_max(struct intel_dp *intel_dp)
 	if (IS_BROXTON(dev))
 		return DP_TRAIN_VOLTAGE_SWING_LEVEL_3;
 	else if (INTEL_INFO(dev)->gen >= 9) {
-		if (dev_priv->vbt.edp_low_vswing && port == PORT_A)
+		if (dev_priv->edp_low_vswing && port == PORT_A)
 			return DP_TRAIN_VOLTAGE_SWING_LEVEL_3;
 		return DP_TRAIN_VOLTAGE_SWING_LEVEL_2;
 	} else if (IS_VALLEYVIEW(dev))