diff options
Diffstat (limited to 'drivers/gpu/drm/i915/i915_drv.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_drv.c | 27 |
1 files changed, 22 insertions, 5 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index c293341a6ad6..dbe40b21fef8 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -1141,21 +1141,32 @@ skl_dram_get_channel_info(struct dram_channel_info *ch, u32 val) return 0; } +static bool +intel_is_dram_symmetric(u32 val_ch0, u32 val_ch1, + struct dram_channel_info *ch0) +{ + return (val_ch0 == val_ch1 && + (ch0->s_info.size == 0 || + (ch0->l_info.size == ch0->s_info.size && + ch0->l_info.width == ch0->s_info.width && + ch0->l_info.rank == ch0->s_info.rank))); +} + static int skl_dram_get_channels_info(struct drm_i915_private *dev_priv) { struct dram_info *dram_info = &dev_priv->dram_info; struct dram_channel_info ch0, ch1; - u32 val; + u32 val_ch0, val_ch1; int ret; - val = I915_READ(SKL_MAD_DIMM_CH0_0_0_0_MCHBAR_MCMAIN); - ret = skl_dram_get_channel_info(&ch0, val); + val_ch0 = I915_READ(SKL_MAD_DIMM_CH0_0_0_0_MCHBAR_MCMAIN); + ret = skl_dram_get_channel_info(&ch0, val_ch0); 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, val); + val_ch1 = I915_READ(SKL_MAD_DIMM_CH1_0_0_0_MCHBAR_MCMAIN); + ret = skl_dram_get_channel_info(&ch1, val_ch1); if (ret == 0) dram_info->num_channels++; @@ -1185,6 +1196,12 @@ skl_dram_get_channels_info(struct drm_i915_private *dev_priv) if (ch0.is_16gb_dimm || ch1.is_16gb_dimm) dram_info->is_16gb_dimm = true; + dev_priv->dram_info.symmetric_memory = intel_is_dram_symmetric(val_ch0, + val_ch1, + &ch0); + + DRM_DEBUG_KMS("memory configuration is %sSymmetric memory\n", + dev_priv->dram_info.symmetric_memory ? "" : "not "); return 0; } |