Hi,
On 8/21/2018 8:27 PM, Kumar, Mahesh wrote:
Hi,
On 8/17/2018 11:50 PM, Rodrigo Vivi wrote:
On Thu, Jul 26, 2018 at 07:44:09PM +0530, Mahesh Kumar wrote:
IPC may cause underflows if not used with dual channel symmetric
memory configuration. Disable IPC for non symmetric configurations in
affected platforms.
Display WA #1141
Signed-off-by: Mahesh Kumar <mahesh1.kumar@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.c | 43
++++++++++++++++++++++++++++++++++++-----
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/intel_pm.c | 2 +-
3 files changed, 40 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.c
b/drivers/gpu/drm/i915/i915_drv.c
index 86bc2e685522..2273664166bc 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1141,21 +1141,47 @@ skl_dram_get_channel_info(struct
dram_channel_info *ch, u32 val)
return 0;
}
+static bool
+intel_is_dram_ipc_capable(struct drm_i915_private *dev_priv,
+ u32 val_ch0, u32 val_ch1,
+ struct dram_channel_info *ch0)
what about
intel_is_dram_symmetric() ?
sounds good.
+{
+ /* Display WA #1141: SKL:all KBL:all CNL:A CNL:B */
move this to the wa call, not the the function check...
+ if (INTEL_GEN(dev_priv) > 9 &&
+ !IS_CNL_REVID(dev_priv, CNL_REVID_A0, CNL_REVID_B0))
please don't add CNL pre-prod wa
ok sure
+ return true;
+
+ if (!IS_KABYLAKE(dev_priv) && !IS_SKYLAKE(dev_priv))
+ return true;
actually remove all platforms checks here...
Agree will remove these checks, function will just return if memory is
symmetric.
+
+ if (val_ch0 != val_ch1)
+ return false;
+
+ if (ch0->s_info.size == 0)
+ return true;
+ if (ch0->l_info.size == ch0->s_info.size &&
+ ch0->l_info.width == ch0->s_info.width &&
+ ch0->l_info.rank == ch0->s_info.rank)
+ return true;
+
+ return false;
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 +1211,13 @@ 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;
+ if (intel_is_dram_ipc_capable(dev_priv, val_ch0, val_ch1, &ch0))
+ dev_priv->ipc_capable_mem = true;
+ else
+ dev_priv->ipc_capable_mem = false;
+
+ DRM_DEBUG_KMS("memory configuration is %sIPC capable\n",
+ dev_priv->ipc_capable_mem ? "" : "not ");
return 0;
}
diff --git a/drivers/gpu/drm/i915/i915_drv.h
b/drivers/gpu/drm/i915/i915_drv.h
index 854f3c828e01..036d6554c017 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2112,6 +2112,7 @@ struct drm_i915_private {
bool chv_phy_assert[2];
bool ipc_enabled;
+ bool ipc_capable_mem;
I don't think we need to stage this...
With above changes storing this info is not needed, But we need to
keep a flag in dram_info to check if "memory is symmetric", Otherwise
we need to compute all the memory related info again.
-Mahesh
/* Used to save the pipe-to-encoder mapping for audio */
struct intel_encoder *av_enc_map[I915_MAX_PIPES];
diff --git a/drivers/gpu/drm/i915/intel_pm.c
b/drivers/gpu/drm/i915/intel_pm.c
index 2446f53adf21..39e400d5f555 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -6097,7 +6097,7 @@ void intel_enable_ipc(struct drm_i915_private
*dev_priv)
u32 val;
/* Display WA #0477 WaDisableIPC: skl */
- if (IS_SKYLAKE(dev_priv)) {
+ if (IS_SKYLAKE(dev_priv) || !dev_priv->ipc_capable_mem) {
dev_priv->ipc_enabled = false;
This is not the WA 1141 for other platforms than SKL. Please only
keep skl here.
For the other WA add 4us across all watermark levels
/* Display WA #1141: skl,kbl,cfl */
if ((IS_KABYLAKE(dev_priv) || IS_COFFEELAKE(dev_priv)) &&
intel_is_dram_symmetric())
levels += 4;
Adding 4us in latency is already taken care in skl_compute_plane_wm.
Will handle here, enabling of IPC only if memory is symmetric.
-Mahesh
return;
}
--
2.16.2
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