[Intel-gfx] [PATCH v2 05/12] drm/i915: Fix DRAM size reporting for BXT

[Ville Syrjala]

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

The BXT DUNIT register tells us the size of each DRAM device
in Gb. We want to report the size of the whole DIMM in GB, so
that it matches how we report it for non-LP platforms.

v2: Deobfuscate the math (Chris)

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index f948d475bdf4..08fb1b1502a0 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1291,9 +1291,14 @@ static int bxt_get_dimm_ranks(u32 val)
 static void bxt_get_dimm_info(struct dram_dimm_info *dimm,
 			      u32 val)
 {
-	dimm->size = bxt_get_dimm_size(val);
 	dimm->width = bxt_get_dimm_width(val);
 	dimm->ranks = bxt_get_dimm_ranks(val);
+
+	/*
+	 * Size in register is Gb per DRAM device. Convert to total
+	 * GB to match the way we report this for non-LP platforms.
+	 */
+	dimm->size = bxt_get_dimm_size(val) * intel_dimm_num_devices(dimm) / 8;
 }
 
 static int
-- 
2.19.2