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drm/i915: Detect eDRAM with the enabled bit only

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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@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Damien Lespiau 2015-02-03 14:25:14 +00:00 committed by Daniel Vetter
parent 72603ec0e2
commit 2db59d5307
2 changed files with 2 additions and 1 deletions
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1
drivers/gpu/drm/i915/i915_reg.h
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@ -5994,6 +5994,7 @@ enum skl_disp_power_wells {
#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)

2
drivers/gpu/drm/i915/intel_uncore.c
View File

@ -329,7 +329,7 @@ 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.