diff mbox series

[OEM-5.10,2/3] drm/i915/gen11+: Only load DRAM information from pcode

Message ID 20210917072758.706541-3-kai.heng.feng@canonical.com
State Accepted
Headers show
Series Fix i915 warnings on skl_dram_get_channel_info() | expand

Commit Message

Kai-Heng Feng Sept. 17, 2021, 7:27 a.m. UTC 
From: José Roberto de Souza <jose.souza@intel.com>

BugLink: https://bugs.launchpad.net/bugs/1943923

Up to now we were reading some DRAM information from MCHBAR register
and from pcode what is already not good but some GEN12(TGL-H and ADL-S)
platforms have MCHBAR DRAM information in different offsets.

This was notified to HW team that decided that the best alternative is
always apply the 16gb_dimm watermark adjustment for GEN12+ platforms
and read the remaning DRAM information needed to other display
programming from pcode.

So here moving the DRAM pcode function to intel_dram.c, removing
the duplicated fields from intel_qgv_info, setting and using
information from dram_info.

v2:
- bring back num_points to intel_qgv_info as num_qgv_point can be
overwritten in icl_get_qgv_points()
- add gen12_get_dram_info() and simplify gen11_get_dram_info()

Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210128164312.91160-2-jose.souza@intel.com
(backported from commit 5d0c938ec9cc96fc7b8abcff0ca8b2a084e9c90c)
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
 drivers/gpu/drm/i915/display/intel_bw.c | 80 +++---------------------
 drivers/gpu/drm/i915/i915_drv.c         |  1 +
 drivers/gpu/drm/i915/i915_drv.h         |  1 +
 drivers/gpu/drm/i915/intel_dram.c       | 82 ++++++++++++++++++++++++-
 4 files changed, 91 insertions(+), 73 deletions(-)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/i915/display/intel_bw.c b/drivers/gpu/drm/i915/display/intel_bw.c
index bd060404d2495..4b5a30ac84bc3 100644
--- a/drivers/gpu/drm/i915/display/intel_bw.c
+++ b/drivers/gpu/drm/i915/display/intel_bw.c
@@ -20,76 +20,9 @@  struct intel_qgv_point {
 struct intel_qgv_info {
 	struct intel_qgv_point points[I915_NUM_QGV_POINTS];
 	u8 num_points;
-	u8 num_channels;
 	u8 t_bl;
-	enum intel_dram_type dram_type;
 };
 
-static int icl_pcode_read_mem_global_info(struct drm_i915_private *dev_priv,
-					  struct intel_qgv_info *qi)
-{
-	u32 val = 0;
-	int ret;
-
-	ret = sandybridge_pcode_read(dev_priv,
-				     ICL_PCODE_MEM_SUBSYSYSTEM_INFO |
-				     ICL_PCODE_MEM_SS_READ_GLOBAL_INFO,
-				     &val, NULL);
-	if (ret)
-		return ret;
-
-	if (IS_GEN(dev_priv, 12)) {
-		switch (val & 0xf) {
-		case 0:
-			qi->dram_type = INTEL_DRAM_DDR4;
-			break;
-		case 3:
-			qi->dram_type = INTEL_DRAM_LPDDR4;
-			break;
-		case 4:
-			qi->dram_type = INTEL_DRAM_DDR3;
-			break;
-		case 5:
-			qi->dram_type = INTEL_DRAM_LPDDR3;
-			break;
-		default:
-			MISSING_CASE(val & 0xf);
-			break;
-		}
-	} else if (IS_GEN(dev_priv, 11)) {
-		switch (val & 0xf) {
-		case 0:
-			qi->dram_type = INTEL_DRAM_DDR4;
-			break;
-		case 1:
-			qi->dram_type = INTEL_DRAM_DDR3;
-			break;
-		case 2:
-			qi->dram_type = INTEL_DRAM_LPDDR3;
-			break;
-		case 3:
-			qi->dram_type = INTEL_DRAM_LPDDR4;
-			break;
-		default:
-			MISSING_CASE(val & 0xf);
-			break;
-		}
-	} else {
-		MISSING_CASE(INTEL_GEN(dev_priv));
-		qi->dram_type = INTEL_DRAM_LPDDR3; /* Conservative default */
-	}
-
-	qi->num_channels = (val & 0xf0) >> 4;
-	qi->num_points = (val & 0xf00) >> 8;
-
-	if (IS_GEN(dev_priv, 12))
-		qi->t_bl = qi->dram_type == INTEL_DRAM_DDR4 ? 4 : 16;
-	else if (IS_GEN(dev_priv, 11))
-		qi->t_bl = qi->dram_type == INTEL_DRAM_DDR4 ? 4 : 8;
-
-	return 0;
-}
-
 static int icl_pcode_read_qgv_point_info(struct drm_i915_private *dev_priv,
 					 struct intel_qgv_point *sp,
 					 int point)
@@ -139,11 +72,15 @@  int icl_pcode_restrict_qgv_points(struct drm_i915_private *dev_priv,
 static int icl_get_qgv_points(struct drm_i915_private *dev_priv,
 			      struct intel_qgv_info *qi)
 {
+	const struct dram_info *dram_info = &dev_priv->dram_info;
 	int i, ret;
 
-	ret = icl_pcode_read_mem_global_info(dev_priv, qi);
-	if (ret)
-		return ret;
+	qi->num_points = dram_info->num_qgv_points;
+
+	if (IS_GEN(dev_priv, 12))
+		qi->t_bl = dev_priv->dram_info.type == INTEL_DRAM_DDR4 ? 4 : 16;
+	else if (IS_GEN(dev_priv, 11))
+		qi->t_bl = dev_priv->dram_info.type == INTEL_DRAM_DDR4 ? 4 : 8;
 
 	if (drm_WARN_ON(&dev_priv->drm,
 			qi->num_points > ARRAY_SIZE(qi->points)))
@@ -209,7 +146,7 @@  static int icl_get_bw_info(struct drm_i915_private *dev_priv, const struct intel
 {
 	struct intel_qgv_info qi = {};
 	bool is_y_tile = true; /* assume y tile may be used */
-	int num_channels;
+	int num_channels = dev_priv->dram_info.num_channels;
 	int deinterleave;
 	int ipqdepth, ipqdepthpch;
 	int dclk_max;
@@ -222,7 +159,6 @@  static int icl_get_bw_info(struct drm_i915_private *dev_priv, const struct intel
 			    "Failed to get memory subsystem information, ignoring bandwidth limits");
 		return ret;
 	}
-	num_channels = qi.num_channels;
 
 	deinterleave = DIV_ROUND_UP(num_channels, is_y_tile ? 4 : 2);
 	dclk_max = icl_sagv_max_dclk(&qi);
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 8ee2dd7c81d1c..35a98b5880cd6 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -608,6 +608,7 @@  static int i915_driver_hw_probe(struct drm_i915_private *dev_priv)
 		goto err_msi;
 
 	intel_opregion_setup(dev_priv);
+
 	/*
 	 * Fill the dram structure to get the system dram info. This will be
 	 * used for memory latency calculation.
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 8e1a2cf139402..b7b034ad8b4eb 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1145,6 +1145,7 @@  struct drm_i915_private {
 			INTEL_DRAM_LPDDR3,
 			INTEL_DRAM_LPDDR4
 		} type;
+		u8 num_qgv_points;
 	} dram_info;
 
 	struct intel_bw_info {
diff --git a/drivers/gpu/drm/i915/intel_dram.c b/drivers/gpu/drm/i915/intel_dram.c
index 6e09390c5141c..1ba81c4b9c86c 100644
--- a/drivers/gpu/drm/i915/intel_dram.c
+++ b/drivers/gpu/drm/i915/intel_dram.c
@@ -5,6 +5,7 @@ 
 
 #include "i915_drv.h"
 #include "intel_dram.h"
+#include "intel_sideband.h"
 
 struct dram_dimm_info {
 	u8 size, width, ranks;
@@ -407,6 +408,81 @@  static int bxt_get_dram_info(struct drm_i915_private *i915)
 	return 0;
 }
 
+static int icl_pcode_read_mem_global_info(struct drm_i915_private *dev_priv)
+{
+	struct dram_info *dram_info = &dev_priv->dram_info;
+	u32 val = 0;
+	int ret;
+
+	ret = sandybridge_pcode_read(dev_priv,
+				     ICL_PCODE_MEM_SUBSYSYSTEM_INFO |
+				     ICL_PCODE_MEM_SS_READ_GLOBAL_INFO,
+				     &val, NULL);
+	if (ret)
+		return ret;
+
+	if (IS_GEN(dev_priv, 12)) {
+		switch (val & 0xf) {
+		case 0:
+			dram_info->type = INTEL_DRAM_DDR4;
+			break;
+		case 3:
+			dram_info->type = INTEL_DRAM_LPDDR4;
+			break;
+		case 4:
+			dram_info->type = INTEL_DRAM_DDR3;
+			break;
+		case 5:
+			dram_info->type = INTEL_DRAM_LPDDR3;
+			break;
+		default:
+			MISSING_CASE(val & 0xf);
+			return -1;
+		}
+	} else {
+		switch (val & 0xf) {
+		case 0:
+			dram_info->type = INTEL_DRAM_DDR4;
+			break;
+		case 1:
+			dram_info->type = INTEL_DRAM_DDR3;
+			break;
+		case 2:
+			dram_info->type = INTEL_DRAM_LPDDR3;
+			break;
+		case 3:
+			dram_info->type = INTEL_DRAM_LPDDR4;
+			break;
+		default:
+			MISSING_CASE(val & 0xf);
+			return -1;
+		}
+	}
+
+	dram_info->num_channels = (val & 0xf0) >> 4;
+	dram_info->num_qgv_points = (val & 0xf00) >> 8;
+
+	return 0;
+}
+
+static int gen11_get_dram_info(struct drm_i915_private *i915)
+{
+	int ret = skl_get_dram_info(i915);
+
+	if (ret)
+		return ret;
+
+	return icl_pcode_read_mem_global_info(i915);
+}
+
+static int gen12_get_dram_info(struct drm_i915_private *i915)
+{
+	/* Always needed for GEN12+ */
+	i915->dram_info.is_16gb_dimm = true;
+
+	return icl_pcode_read_mem_global_info(i915);
+}
+
 void intel_dram_detect(struct drm_i915_private *i915)
 {
 	struct dram_info *dram_info = &i915->dram_info;
@@ -422,7 +498,11 @@  void intel_dram_detect(struct drm_i915_private *i915)
 	if (INTEL_GEN(i915) < 9 || !HAS_DISPLAY(i915))
 		return;
 
-	if (IS_GEN9_LP(i915))
+	if (INTEL_GEN(i915) >= 12)
+		ret = gen12_get_dram_info(i915);
+	else if (INTEL_GEN(i915) >= 11)
+		ret = gen11_get_dram_info(i915);
+	else if (IS_GEN9_LP(i915))
 		ret = bxt_get_dram_info(i915);
 	else
 		ret = skl_get_dram_info(i915);