From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
We'll need to know the memory type in the system for some
bandwidth limitations and whatnot. Let's read that out on
gen9+.
v2: Rebase
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.c | 84 +++++++++++++++++++++++++++++++--
drivers/gpu/drm/i915/i915_drv.h | 7 +++
drivers/gpu/drm/i915/i915_reg.h | 13 +++++
3 files changed, 100 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 47d1a8734f2d..03ad9a8e32f4 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1068,6 +1068,26 @@ static void intel_sanitize_options(struct drm_i915_private *dev_priv)
intel_gvt_sanitize_options(dev_priv);
}
+#define DRAM_TYPE_STR(type) [INTEL_DRAM_ ## type] = #type
+
+static const char *intel_dram_type_str(enum intel_dram_type type)
+{
+ static const char * const str[] = {
+ DRAM_TYPE_STR(UNKNOWN),
+ DRAM_TYPE_STR(DDR3),
+ DRAM_TYPE_STR(DDR4),
+ DRAM_TYPE_STR(LPDDR3),
+ DRAM_TYPE_STR(LPDDR4),
+ };
+
+ if (type >= ARRAY_SIZE(str))
+ type = INTEL_DRAM_UNKNOWN;
+
+ return str[type];
+}
+
+#undef DRAM_TYPE_STR
+
static int intel_dimm_num_devices(const struct dram_dimm_info *dimm)
{
return dimm->ranks * 64 / (dimm->width ?: 1);
@@ -1252,6 +1272,28 @@ skl_dram_get_channels_info(struct drm_i915_private *dev_priv)
return 0;
}
+static enum intel_dram_type
+skl_get_dram_type(struct drm_i915_private *dev_priv)
+{
+ u32 val;
+
+ val = I915_READ(SKL_MAD_INTER_CHANNEL_0_0_0_MCHBAR_MCMAIN);
+
+ switch (val & SKL_DRAM_DDR_TYPE_MASK) {
+ case SKL_DRAM_DDR_TYPE_DDR3:
+ return INTEL_DRAM_DDR3;
+ case SKL_DRAM_DDR_TYPE_DDR4:
+ return INTEL_DRAM_DDR4;
+ case SKL_DRAM_DDR_TYPE_LPDDR3:
+ return INTEL_DRAM_LPDDR3;
+ case SKL_DRAM_DDR_TYPE_LPDDR4:
+ return INTEL_DRAM_LPDDR4;
+ default:
+ MISSING_CASE(val);
+ return INTEL_DRAM_UNKNOWN;
+ }
+}
+
static int
skl_get_dram_info(struct drm_i915_private *dev_priv)
{
@@ -1259,6 +1301,9 @@ skl_get_dram_info(struct drm_i915_private *dev_priv)
u32 mem_freq_khz, val;
int ret;
+ dram_info->type = skl_get_dram_type(dev_priv);
+ DRM_DEBUG_KMS("DRAM type: %s\n", intel_dram_type_str(dram_info->type));
+
ret = skl_dram_get_channels_info(dev_priv);
if (ret)
return ret;
@@ -1324,6 +1369,26 @@ static int bxt_get_dimm_ranks(u32 val)
}
}
+static enum intel_dram_type bxt_get_dimm_type(u32 val)
+{
+ if (!bxt_get_dimm_size(val))
+ return INTEL_DRAM_UNKNOWN;
+
+ switch (val & BXT_DRAM_TYPE_MASK) {
+ case BXT_DRAM_TYPE_DDR3:
+ return INTEL_DRAM_DDR3;
+ case BXT_DRAM_TYPE_LPDDR3:
+ return INTEL_DRAM_LPDDR3;
+ case BXT_DRAM_TYPE_DDR4:
+ return INTEL_DRAM_DDR4;
+ case BXT_DRAM_TYPE_LPDDR4:
+ return INTEL_DRAM_LPDDR4;
+ default:
+ MISSING_CASE(val);
+ return INTEL_DRAM_UNKNOWN;
+ }
+}
+
static void bxt_get_dimm_info(struct dram_dimm_info *dimm,
u32 val)
{
@@ -1366,6 +1431,7 @@ bxt_get_dram_info(struct drm_i915_private *dev_priv)
*/
for (i = BXT_D_CR_DRP0_DUNIT_START; i <= BXT_D_CR_DRP0_DUNIT_END; i++) {
struct dram_dimm_info dimm;
+ enum intel_dram_type type;
val = I915_READ(BXT_D_CR_DRP0_DUNIT(i));
if (val == 0xFFFFFFFF)
@@ -1374,10 +1440,16 @@ bxt_get_dram_info(struct drm_i915_private *dev_priv)
dram_info->num_channels++;
bxt_get_dimm_info(&dimm, val);
+ type = bxt_get_dimm_type(val);
+
+ WARN_ON(type != INTEL_DRAM_UNKNOWN &&
+ dram_info->type != INTEL_DRAM_UNKNOWN &&
+ dram_info->type != type);
- DRM_DEBUG_KMS("CH%d DIMM size: %d GB, width: X%d, ranks: %d\n",
+ DRM_DEBUG_KMS("CH%d DIMM size: % dGB, width: X%d, ranks: %d, type: %s\n",
i - BXT_D_CR_DRP0_DUNIT_START,
- dimm.size, dimm.width, dimm.ranks);
+ dimm.size, dimm.width, dimm.ranks,
+ intel_dram_type_str(type));
/*
* If any of the channel is single rank channel,
@@ -1388,10 +1460,14 @@ bxt_get_dram_info(struct drm_i915_private *dev_priv)
dram_info->ranks = dimm.ranks;
else if (dimm.ranks == 1)
dram_info->ranks = 1;
+
+ if (type != INTEL_DRAM_UNKNOWN)
+ dram_info->type = type;
}
- if (dram_info->ranks == 0) {
- DRM_INFO("couldn't get memory rank information\n");
+ if (dram_info->type == INTEL_DRAM_UNKNOWN ||
+ dram_info->ranks == 0) {
+ DRM_INFO("couldn't get memory information\n");
return -EINVAL;
}
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 89881b68dcb4..67a283ad54b1 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1836,6 +1836,13 @@ struct drm_i915_private {
u8 ranks;
u32 bandwidth_kbps;
bool symmetric_memory;
+ enum intel_dram_type {
+ INTEL_DRAM_UNKNOWN,
+ INTEL_DRAM_DDR3,
+ INTEL_DRAM_DDR4,
+ INTEL_DRAM_LPDDR3,
+ INTEL_DRAM_LPDDR4
+ } type;
} dram_info;
struct i915_runtime_pm runtime_pm;
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index b35b0220764f..1a6904176fc6 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -9859,11 +9859,24 @@ enum skl_power_gate {
#define BXT_DRAM_SIZE_8GB (0x2 << 6)
#define BXT_DRAM_SIZE_12GB (0x3 << 6)
#define BXT_DRAM_SIZE_16GB (0x4 << 6)
+#define BXT_DRAM_TYPE_MASK (0x7 << 22)
+#define BXT_DRAM_TYPE_SHIFT 22
+#define BXT_DRAM_TYPE_DDR3 (0x0 << 6)
+#define BXT_DRAM_TYPE_LPDDR3 (0x1 << 6)
+#define BXT_DRAM_TYPE_LPDDR4 (0x2 << 6)
+#define BXT_DRAM_TYPE_DDR4 (0x4 << 6)
#define SKL_MEMORY_FREQ_MULTIPLIER_HZ 266666666
#define SKL_MC_BIOS_DATA_0_0_0_MCHBAR_PCU _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x5E04)
#define SKL_REQ_DATA_MASK (0xF << 0)
+#define SKL_MAD_INTER_CHANNEL_0_0_0_MCHBAR_MCMAIN _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x5000)
+#define SKL_DRAM_DDR_TYPE_MASK (0x3 << 0)
+#define SKL_DRAM_DDR_TYPE_DDR4 (0 << 0)
+#define SKL_DRAM_DDR_TYPE_DDR3 (1 << 0)
+#define SKL_DRAM_DDR_TYPE_LPDDR3 (2 << 0)
+#define SKL_DRAM_DDR_TYPE_LPDDR4 (3 << 0)
+
#define SKL_MAD_DIMM_CH0_0_0_0_MCHBAR_MCMAIN _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x500C)
#define SKL_MAD_DIMM_CH1_0_0_0_MCHBAR_MCMAIN _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x5010)
#define SKL_DRAM_S_SHIFT 16
--
2.19.2
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