Op 24-08-18 om 11:32 schreef Mahesh Kumar: > 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 > > Changes Since V1: > - Re-arrange the code. > - update wrapper to return if memory is symmetric (Rodrigo) > > Signed-off-by: Mahesh Kumar <[email protected]> > --- > drivers/gpu/drm/i915/i915_drv.c | 27 ++++++++++++++++++++++----- > drivers/gpu/drm/i915/i915_drv.h | 1 + > drivers/gpu/drm/i915/intel_pm.c | 5 +++++ > 3 files changed, 28 insertions(+), 5 deletions(-) > > diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c > index 2bc74c01a0e5..61d756ae7bf0 100644 > --- a/drivers/gpu/drm/i915/i915_drv.c > +++ b/drivers/gpu/drm/i915/i915_drv.c > @@ -1154,21 +1154,32 @@ 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++; > > @@ -1198,6 +1209,12 @@ 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; > } > > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h > index 6c432684c721..e7faa046f78a 100644 > --- a/drivers/gpu/drm/i915/i915_drv.h > +++ b/drivers/gpu/drm/i915/i915_drv.h > @@ -1955,6 +1955,7 @@ struct drm_i915_private { > I915_DRAM_RANK_DUAL > } rank; > u32 bandwidth_kbps; > + bool symmetric_memory; > } dram_info; > > struct i915_runtime_pm runtime_pm; > diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c > index 77970e38d939..c27646fb4cec 100644 > --- a/drivers/gpu/drm/i915/intel_pm.c > +++ b/drivers/gpu/drm/i915/intel_pm.c > @@ -6124,6 +6124,11 @@ void intel_enable_ipc(struct drm_i915_private > *dev_priv) > if (IS_SKYLAKE(dev_priv)) > dev_priv->ipc_enabled = false; > > + /* Display WA #1141: SKL:all KBL:all CFL */ > + if ((IS_KABYLAKE(dev_priv) || IS_COFFEELAKE(dev_priv)) && > + !dev_priv->dram_info.symmetric_memory) > + dev_priv->ipc_enabled = false; > + > val = I915_READ(DISP_ARB_CTL2); > > if (dev_priv->ipc_enabled)
Patch series looks good with minor nit in 3/5 fixed. Reviewed-by: Maarten Lankhorst <[email protected]> _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
