[Intel-gfx] [PATCH v2 1/4] drm/i915: Nuke not needed members of dram_info

* [Intel-gfx] [PATCH v2 1/4] drm/i915: Nuke not needed members of dram_info
@ 2021-01-27 16:53 José Roberto de Souza
  2021-01-27 16:54 ` [Intel-gfx] [PATCH v2 2/4] drm/i915/gen11+: Only load DRAM information from pcode José Roberto de Souza
                   ` (3 more replies)
  0 siblings, 4 replies; 8+ messages in thread
From: José Roberto de Souza @ 2021-01-27 16:53 UTC (permalink / raw)
  To: intel-gfx; +Cc: Lucas De Marchi

Valid, ranks and bandwidth_kbps are set into dram_info but are not
used anywhere else so nuking it.

Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c   |  4 +--
 drivers/gpu/drm/i915/i915_drv.h   |  3 --
 drivers/gpu/drm/i915/intel_dram.c | 47 +++++++------------------------
 3 files changed, 12 insertions(+), 42 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 0037b81d991e..36e073c4bc06 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -616,8 +616,8 @@ static int i915_driver_hw_probe(struct drm_i915_private *dev_priv)
 
 	intel_opregion_setup(dev_priv);
 	/*
-	 * Fill the dram structure to get the system raw bandwidth and
-	 * dram info. This will be used for memory latency calculation.
+	 * Fill the dram structure to get the system dram info. This will be
+	 * used for memory latency calculation.
 	 */
 	intel_dram_detect(dev_priv);
 
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 3edc9c4f2d21..4e8e151c7ade 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1128,11 +1128,8 @@ struct drm_i915_private {
 	} wm;
 
 	struct dram_info {
-		bool valid;
 		bool is_16gb_dimm;
 		u8 num_channels;
-		u8 ranks;
-		u32 bandwidth_kbps;
 		bool symmetric_memory;
 		enum intel_dram_type {
 			INTEL_DRAM_UNKNOWN,
diff --git a/drivers/gpu/drm/i915/intel_dram.c b/drivers/gpu/drm/i915/intel_dram.c
index 4754296a250e..694fbd8c9cd4 100644
--- a/drivers/gpu/drm/i915/intel_dram.c
+++ b/drivers/gpu/drm/i915/intel_dram.c
@@ -201,17 +201,7 @@ skl_dram_get_channels_info(struct drm_i915_private *i915)
 		return -EINVAL;
 	}
 
-	/*
-	 * If any of the channel is single rank channel, worst case output
-	 * will be same as if single rank memory, so consider single rank
-	 * memory.
-	 */
-	if (ch0.ranks == 1 || ch1.ranks == 1)
-		dram_info->ranks = 1;
-	else
-		dram_info->ranks = max(ch0.ranks, ch1.ranks);
-
-	if (dram_info->ranks == 0) {
+	if (ch0.ranks == 0 && ch1.ranks == 0) {
 		drm_info(&i915->drm, "couldn't get memory rank information\n");
 		return -EINVAL;
 	}
@@ -269,16 +259,12 @@ skl_get_dram_info(struct drm_i915_private *i915)
 	mem_freq_khz = DIV_ROUND_UP((val & SKL_REQ_DATA_MASK) *
 				    SKL_MEMORY_FREQ_MULTIPLIER_HZ, 1000);
 
-	dram_info->bandwidth_kbps = dram_info->num_channels *
-		mem_freq_khz * 8;
-
-	if (dram_info->bandwidth_kbps == 0) {
+	if (dram_info->num_channels * mem_freq_khz == 0) {
 		drm_info(&i915->drm,
 			 "Couldn't get system memory bandwidth\n");
 		return -EINVAL;
 	}
 
-	dram_info->valid = true;
 	return 0;
 }
 
@@ -365,7 +351,7 @@ static int bxt_get_dram_info(struct drm_i915_private *i915)
 	struct dram_info *dram_info = &i915->dram_info;
 	u32 dram_channels;
 	u32 mem_freq_khz, val;
-	u8 num_active_channels;
+	u8 num_active_channels, valid_ranks = 0;
 	int i;
 
 	val = intel_uncore_read(&i915->uncore, BXT_P_CR_MC_BIOS_REQ_0_0_0);
@@ -375,10 +361,7 @@ static int bxt_get_dram_info(struct drm_i915_private *i915)
 	dram_channels = val & BXT_DRAM_CHANNEL_ACTIVE_MASK;
 	num_active_channels = hweight32(dram_channels);
 
-	/* Each active bit represents 4-byte channel */
-	dram_info->bandwidth_kbps = (mem_freq_khz * num_active_channels * 4);
-
-	if (dram_info->bandwidth_kbps == 0) {
+	if (mem_freq_khz * num_active_channels == 0) {
 		drm_info(&i915->drm,
 			 "Couldn't get system memory bandwidth\n");
 		return -EINVAL;
@@ -410,27 +393,18 @@ static int bxt_get_dram_info(struct drm_i915_private *i915)
 			    dimm.size, dimm.width, dimm.ranks,
 			    intel_dram_type_str(type));
 
-		/*
-		 * If any of the channel is single rank channel,
-		 * worst case output will be same as if single rank
-		 * memory, so consider single rank memory.
-		 */
-		if (dram_info->ranks == 0)
-			dram_info->ranks = dimm.ranks;
-		else if (dimm.ranks == 1)
-			dram_info->ranks = 1;
+		if (valid_ranks == 0)
+			valid_ranks = dimm.ranks;
 
 		if (type != INTEL_DRAM_UNKNOWN)
 			dram_info->type = type;
 	}
 
-	if (dram_info->type == INTEL_DRAM_UNKNOWN || dram_info->ranks == 0) {
+	if (dram_info->type == INTEL_DRAM_UNKNOWN || valid_ranks == 0) {
 		drm_info(&i915->drm, "couldn't get memory information\n");
 		return -EINVAL;
 	}
 
-	dram_info->valid = true;
-
 	return 0;
 }
 
@@ -456,11 +430,10 @@ void intel_dram_detect(struct drm_i915_private *i915)
 	if (ret)
 		return;
 
-	drm_dbg_kms(&i915->drm, "DRAM bandwidth: %u kBps, channels: %u\n",
-		    dram_info->bandwidth_kbps, dram_info->num_channels);
+	drm_dbg_kms(&i915->drm, "DRAM channels: %u\n", dram_info->num_channels);
 
-	drm_dbg_kms(&i915->drm, "DRAM ranks: %u, 16Gb DIMMs: %s\n",
-		    dram_info->ranks, yesno(dram_info->is_16gb_dimm));
+	drm_dbg_kms(&i915->drm, "DRAM 16Gb DIMMs: %s\n",
+		    yesno(dram_info->is_16gb_dimm));
 }
 
 static u32 gen9_edram_size_mb(struct drm_i915_private *i915, u32 cap)
-- 
2.30.0

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