From: Matt Roper Date: Wed, 23 Feb 2022 16:54:21 +0000 (-0800) Subject: drm/i915/dg2: Skip output init on PHY calibration failure X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=b4eb76d82a0ea92241f5079874a7aea10c5cc4ae;p=linux.git drm/i915/dg2: Skip output init on PHY calibration failure If one of our PHYs fails to complete calibration, we should skip the general initialization of the corresponding output. Most likely this is going to happen on outputs that don't actually exist on the board; in theory we should have already decided to skip this output based on the VBT, but we can't always rely on the VBT being accurate. Cc: Lucas De Marchi Signed-off-by: Matt Roper Reviewed-by: Lucas De Marchi Link: https://patchwork.freedesktop.org/patch/msgid/20220223165421.3949883-1-matthew.d.roper@intel.com --- diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c index e4260806c2a40..1cd394b0585e2 100644 --- a/drivers/gpu/drm/i915/display/intel_ddi.c +++ b/drivers/gpu/drm/i915/display/intel_ddi.c @@ -4308,6 +4308,14 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port) return; } + if (intel_phy_is_snps(dev_priv, phy) && + dev_priv->snps_phy_failed_calibration & BIT(phy)) { + drm_dbg_kms(&dev_priv->drm, + "SNPS PHY %c failed to calibrate; output will not be used.\n", + phy_name(phy)); + return; + } + dig_port = kzalloc(sizeof(*dig_port), GFP_KERNEL); if (!dig_port) return; diff --git a/drivers/gpu/drm/i915/display/intel_snps_phy.c b/drivers/gpu/drm/i915/display/intel_snps_phy.c index 7e6245b97feda..0dd4775e8195e 100644 --- a/drivers/gpu/drm/i915/display/intel_snps_phy.c +++ b/drivers/gpu/drm/i915/display/intel_snps_phy.c @@ -32,10 +32,14 @@ void intel_snps_phy_wait_for_calibration(struct drm_i915_private *i915) if (!intel_phy_is_snps(i915, phy)) continue; + /* + * If calibration does not complete successfully, we'll remember + * which phy was affected and skip setup of the corresponding + * output later. + */ if (intel_de_wait_for_clear(i915, DG2_PHY_MISC(phy), DG2_PHY_DP_TX_ACK_MASK, 25)) - drm_err(&i915->drm, "SNPS PHY %c failed to calibrate after 25ms.\n", - phy_name(phy)); + i915->snps_phy_failed_calibration |= BIT(phy); } } diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index e71dcd2701ca4..5cfe69b308416 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -837,8 +837,16 @@ struct drm_i915_private { bool irq_enabled; - /* perform PHY state sanity checks? */ - bool chv_phy_assert[2]; + union { + /* perform PHY state sanity checks? */ + bool chv_phy_assert[2]; + + /* + * DG2: Mask of PHYs that were not calibrated by the firmware + * and should not be used. + */ + u8 snps_phy_failed_calibration; + }; bool ipc_enabled;