[PATCH 03/12] drm/i915: Polish skl_is_16gb_dimm()

[Ville Syrjala <ville.syrjala@linux.intel.com>]

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

Pass the dimm struct to skl_is_16gb_dimm() rather than passing each
value separately. And let's replace the hardcoded set of values with
some simple arithmetic.

Also fix the byte vs. bit inconsistency in the debug message,
and polish the wording otherwise as well.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c | 22 ++++++----------------
 drivers/gpu/drm/i915/i915_drv.h |  8 +++++---
 2 files changed, 11 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index b94bf475b04c..9d7fc2bc6593 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1107,18 +1107,9 @@ static int skl_get_dimm_ranks(u16 val)
 }
 
 static bool
-skl_is_16gb_dimm(u8 ranks, u8 size, u8 width)
+skl_is_16gb_dimm(const struct dram_dimm_info *dimm)
 {
-	if (ranks == 1 && width == 8 && size == 16)
-		return true;
-	else if (ranks == 2 && width == 8 && size == 32)
-		return true;
-	else if (ranks == 1 && width == 16 && size == 8)
-		return true;
-	else if (ranks == 2 && width == 16 && size == 16)
-		return true;
-
-	return false;
+	return dimm->size * dimm->width / (8 * dimm->ranks ?: 1) == 16;
 }
 
 static int
@@ -1148,10 +1139,9 @@ skl_dram_get_channel_info(struct dram_channel_info *ch, u32 val)
 	else
 		ch->ranks = 1;
 
-	ch->is_16gb_dimm = skl_is_16gb_dimm(ch->l_info.ranks, ch->l_info.size,
-					    ch->l_info.width) ||
-			   skl_is_16gb_dimm(ch->s_info.ranks, ch->s_info.size,
-					    ch->s_info.width);
+	ch->is_16gb_dimm =
+		skl_is_16gb_dimm(&ch->l_info) ||
+		skl_is_16gb_dimm(&ch->s_info);
 
 	DRM_DEBUG_KMS("(size:width:ranks) L(%dGB:X%d:%d) S(%dGB:X%d:%d)\n",
 		      ch->l_info.size, ch->l_info.width, ch->l_info.ranks,
@@ -1369,7 +1359,7 @@ intel_get_dram_info(struct drm_i915_private *dev_priv)
 		sprintf(bandwidth_str, "unknown");
 	DRM_DEBUG_KMS("DRAM bandwidth:%s, total-channels: %u\n",
 		      bandwidth_str, dram_info->num_channels);
-	DRM_DEBUG_KMS("DRAM ranks: %d, 16GB-dimm:%s\n",
+	DRM_DEBUG_KMS("DRAM ranks: %d, 16Gb DIMMs: %s\n",
 		      dram_info->ranks, yesno(dram_info->is_16gb_dimm));
 }
 
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index c9cb13a6edaf..fcde09934bb5 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2065,10 +2065,12 @@ struct drm_i915_private {
 	 */
 };
 
+struct dram_dimm_info {
+	u8 size, width, ranks;
+};
+
 struct dram_channel_info {
-	struct info {
-		u8 size, width, ranks;
-	} l_info, s_info;
+	struct dram_dimm_info l_info, s_info;
 	u8 ranks;
 	bool is_16gb_dimm;
 };
-- 
2.19.2

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