From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
We'll need information about the memory configuration on cnl+ too.
Extend the code to parse the slightly changed register layout.
v2: Document what cnl_get_dimm_size() returns (Jani)
Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.c | 66 ++++++++++++++++++++++++++-------
drivers/gpu/drm/i915/i915_reg.h | 17 ++++++++-
2 files changed, 68 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 0d00f837ba7f..611e15edcd66 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1106,6 +1106,39 @@ static int skl_get_dimm_ranks(u16 val)
return val + 1;
}
+/* Returns total GB for the whole DIMM */
+static int cnl_get_dimm_size(u16 val)
+{
+ return (val & CNL_DRAM_SIZE_MASK) / 2;
+}
+
+static int cnl_get_dimm_width(u16 val)
+{
+ if (cnl_get_dimm_size(val) == 0)
+ return 0;
+
+ switch (val & CNL_DRAM_WIDTH_MASK) {
+ case CNL_DRAM_WIDTH_X8:
+ case CNL_DRAM_WIDTH_X16:
+ case CNL_DRAM_WIDTH_X32:
+ val = (val & CNL_DRAM_WIDTH_MASK) >> CNL_DRAM_WIDTH_SHIFT;
+ return 8 << val;
+ default:
+ MISSING_CASE(val);
+ return 0;
+ }
+}
+
+static int cnl_get_dimm_ranks(u16 val)
+{
+ if (cnl_get_dimm_size(val) == 0)
+ return 0;
+
+ val = (val & CNL_DRAM_RANK_MASK) >> CNL_DRAM_RANK_SHIFT;
+
+ return val + 1;
+}
+
static bool
skl_is_16gb_dimm(const struct dram_dimm_info *dimm)
{
@@ -1114,12 +1147,19 @@ skl_is_16gb_dimm(const struct dram_dimm_info *dimm)
}
static void
-skl_dram_get_dimm_info(struct dram_dimm_info *dimm,
+skl_dram_get_dimm_info(struct drm_i915_private *dev_priv,
+ struct dram_dimm_info *dimm,
int channel, char dimm_name, u16 val)
{
- dimm->size = skl_get_dimm_size(val);
- dimm->width = skl_get_dimm_width(val);
- dimm->ranks = skl_get_dimm_ranks(val);
+ if (INTEL_GEN(dev_priv) >= 10) {
+ dimm->size = cnl_get_dimm_size(val);
+ dimm->width = cnl_get_dimm_width(val);
+ dimm->ranks = cnl_get_dimm_ranks(val);
+ } else {
+ dimm->size = skl_get_dimm_size(val);
+ dimm->width = skl_get_dimm_width(val);
+ dimm->ranks = skl_get_dimm_ranks(val);
+ }
DRM_DEBUG_KMS("CH%u DIMM %c size: %u GB, width: X%u, ranks: %u, 16Gb DIMMs: %s\n",
channel, dimm_name, dimm->size, dimm->width, dimm->ranks,
@@ -1127,11 +1167,14 @@ skl_dram_get_dimm_info(struct dram_dimm_info *dimm,
}
static int
-skl_dram_get_channel_info(struct dram_channel_info *ch,
+skl_dram_get_channel_info(struct drm_i915_private *dev_priv,
+ struct dram_channel_info *ch,
int channel, u32 val)
{
- skl_dram_get_dimm_info(&ch->dimm_l, channel, 'L', val & 0xffff);
- skl_dram_get_dimm_info(&ch->dimm_s, channel, 'S', val >> 16);
+ skl_dram_get_dimm_info(dev_priv, &ch->dimm_l,
+ channel, 'L', val & 0xffff);
+ skl_dram_get_dimm_info(dev_priv, &ch->dimm_s,
+ channel, 'S', val >> 16);
if (ch->dimm_l.size == 0 && ch->dimm_s.size == 0) {
DRM_DEBUG_KMS("CH%u not populated\n", channel);
@@ -1173,12 +1216,12 @@ skl_dram_get_channels_info(struct drm_i915_private *dev_priv)
int ret;
val = I915_READ(SKL_MAD_DIMM_CH0_0_0_0_MCHBAR_MCMAIN);
- ret = skl_dram_get_channel_info(&ch0, 0, val);
+ ret = skl_dram_get_channel_info(dev_priv, &ch0, 0, val);
if (ret == 0)
dram_info->num_channels++;
val = I915_READ(SKL_MAD_DIMM_CH1_0_0_0_MCHBAR_MCMAIN);
- ret = skl_dram_get_channel_info(&ch1, 1, val);
+ ret = skl_dram_get_channel_info(dev_priv, &ch1, 1, val);
if (ret == 0)
dram_info->num_channels++;
@@ -1375,13 +1418,10 @@ intel_get_dram_info(struct drm_i915_private *dev_priv)
if (INTEL_GEN(dev_priv) < 9)
return;
- /* Need to calculate bandwidth only for Gen9 */
if (IS_GEN9_LP(dev_priv))
ret = bxt_get_dram_info(dev_priv);
- else if (IS_GEN(dev_priv, 9))
- ret = skl_get_dram_info(dev_priv);
else
- ret = skl_dram_get_channels_info(dev_priv);
+ ret = skl_get_dram_info(dev_priv);
if (ret)
return;
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 75236b4f0daf..695eb3ec7187 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -9877,8 +9877,21 @@ enum skl_power_gate {
#define SKL_DRAM_WIDTH_X32 (0x2 << 8)
#define SKL_DRAM_RANK_MASK (0x1 << 10)
#define SKL_DRAM_RANK_SHIFT 10
-#define SKL_DRAM_RANK_SINGLE (0x0 << 10)
-#define SKL_DRAM_RANK_DUAL (0x1 << 10)
+#define SKL_DRAM_RANK_1 (0x0 << 10)
+#define SKL_DRAM_RANK_2 (0x1 << 10)
+#define SKL_DRAM_RANK_MASK (0x1 << 10)
+#define CNL_DRAM_SIZE_MASK 0x7F
+#define CNL_DRAM_WIDTH_MASK (0x3 << 7)
+#define CNL_DRAM_WIDTH_SHIFT 7
+#define CNL_DRAM_WIDTH_X8 (0x0 << 7)
+#define CNL_DRAM_WIDTH_X16 (0x1 << 7)
+#define CNL_DRAM_WIDTH_X32 (0x2 << 7)
+#define CNL_DRAM_RANK_MASK (0x3 << 9)
+#define CNL_DRAM_RANK_SHIFT 9
+#define CNL_DRAM_RANK_1 (0x0 << 9)
+#define CNL_DRAM_RANK_2 (0x1 << 9)
+#define CNL_DRAM_RANK_3 (0x2 << 9)
+#define CNL_DRAM_RANK_4 (0x3 << 9)
/* Please see hsw_read_dcomp() and hsw_write_dcomp() before using this register,
* since on HSW we can't write to it using I915_WRITE. */
--
2.19.2
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