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drm/i915: Extract BXT DIMM helpers

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Polish the bxt DIMM parsing by extracting a few small helpers.

v2: Use struct dram_dimm_info
v3: Document what bxt_get_dimm_size() returns (Jani)

Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190306203551.24592-5-ville.syrjala@linux.intel.com
This commit is contained in:
Ville Syrjälä 2019-03-06 22:35:43 +02:00
parent 54561b238b
commit a62819a301
1 changed files with 61 additions and 29 deletions
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90
drivers/gpu/drm/i915/i915_drv.c
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@ -1238,6 +1238,60 @@ skl_get_dram_info(struct drm_i915_private *dev_priv)
return 0;
}
/* Returns Gb per DRAM device */
static int bxt_get_dimm_size(u32 val)
{
switch (val & BXT_DRAM_SIZE_MASK) {
case BXT_DRAM_SIZE_4GB:
return 4;
case BXT_DRAM_SIZE_6GB:
return 6;
case BXT_DRAM_SIZE_8GB:
return 8;
case BXT_DRAM_SIZE_12GB:
return 12;
case BXT_DRAM_SIZE_16GB:
return 16;
default:
MISSING_CASE(val);
return 0;
}
}
static int bxt_get_dimm_width(u32 val)
{
if (!bxt_get_dimm_size(val))
return 0;
val = (val & BXT_DRAM_WIDTH_MASK) >> BXT_DRAM_WIDTH_SHIFT;
return 8 << val;
}
static int bxt_get_dimm_ranks(u32 val)
{
if (!bxt_get_dimm_size(val))
return 0;
switch (val & BXT_DRAM_RANK_MASK) {
case BXT_DRAM_RANK_SINGLE:
return 1;
case BXT_DRAM_RANK_DUAL:
return 2;
default:
MISSING_CASE(val);
return 0;
}
}
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);
}
static int
bxt_get_dram_info(struct drm_i915_private *dev_priv)
{
@ -1266,41 +1320,19 @@ bxt_get_dram_info(struct drm_i915_private *dev_priv)
* Now read each DUNIT8/9/10/11 to check the rank of each dimms.
*/
for (i = BXT_D_CR_DRP0_DUNIT_START; i <= BXT_D_CR_DRP0_DUNIT_END; i++) {
u8 size, width, ranks;
u32 tmp;
struct dram_dimm_info dimm;
val = I915_READ(BXT_D_CR_DRP0_DUNIT(i));
if (val == 0xFFFFFFFF)
continue;
dram_info->num_channels++;
tmp = val & BXT_DRAM_RANK_MASK;
if (tmp == BXT_DRAM_RANK_SINGLE)
ranks = 1;
else if (tmp == BXT_DRAM_RANK_DUAL)
ranks = 2;
else
ranks = 0;
bxt_get_dimm_info(&dimm, val);
tmp = val & BXT_DRAM_SIZE_MASK;
if (tmp == BXT_DRAM_SIZE_4GB)
size = 4;
else if (tmp == BXT_DRAM_SIZE_6GB)
size = 6;
else if (tmp == BXT_DRAM_SIZE_8GB)
size = 8;
else if (tmp == BXT_DRAM_SIZE_12GB)
size = 12;
else if (tmp == BXT_DRAM_SIZE_16GB)
size = 16;
else
size = 0;
tmp = (val & BXT_DRAM_WIDTH_MASK) >> BXT_DRAM_WIDTH_SHIFT;
width = (1 << tmp) * 8;
DRM_DEBUG_KMS("dram size:%uGB width:X%u ranks:%u\n",
size, width, ranks);
DRM_DEBUG_KMS("CH%u DIMM size: %u GB, width: X%u, ranks: %u\n",
i - BXT_D_CR_DRP0_DUNIT_START,
dimm.size, dimm.width, dimm.ranks);
/*
* If any of the channel is single rank channel,
@ -1308,8 +1340,8 @@ bxt_get_dram_info(struct drm_i915_private *dev_priv)
* memory, so consider single rank memory.
*/
if (dram_info->ranks == 0)
dram_info->ranks = ranks;
else if (ranks == 1)
dram_info->ranks = dimm.ranks;
else if (dimm.ranks == 1)
dram_info->ranks = 1;
}