At the moment we compare the whole EDRAM_PRESENT/EDRAMCAP register value
to 1 while EDRAM_PRESENT is only bit 0 (the rest may be used to describe
eDRAM capabilities).
To be more future proof, only look at bit 0 to detect eDRAM presence.
Signed-off-by: Damien Lespiau <damien.lespiau@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_uncore.c | 2 +-
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 33b3d0a2..0aeaf7d 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5980,6 +5980,7 @@ enum punit_power_well {
#define HSW_IDICR 0x9008
#define IDIHASHMSK(x) (((x) & 0x3f) << 16)
#define HSW_EDRAM_PRESENT 0x120010
+#define EDRAM_ENABLED 0x1
#define GEN6_UCGCTL1 0x9400
# define GEN6_EU_TCUNIT_CLOCK_GATE_DISABLE (1 << 16)
diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 76b60a3..00c91be 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -328,7 +328,7 @@ static void intel_uncore_ellc_detect(struct drm_device *dev)
struct drm_i915_private *dev_priv = dev->dev_private;
if ((IS_HASWELL(dev) || IS_BROADWELL(dev)) &&
- (__raw_i915_read32(dev_priv, HSW_EDRAM_PRESENT) == 1)) {
+ (__raw_i915_read32(dev_priv, HSW_EDRAM_PRESENT) & EDRAM_ENABLED)) {
/* The docs do not explain exactly how the calculation can be
* made. It is somewhat guessable, but for now, it's always
* 128MB.
--
1.8.3.1
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