drm/i915/gen9_lp: Increase DDI PHY0 power well enabling timeout

On GLK sporadic timeouts occur during PHY0 enabling. Based on logs it looks like they happen sometime after a system suspend/resume cycle, with the same power well enabling succeeding both before and after the failed one and no other problems observed. The current timeout in the code is not actually specified by BSpec, so let's try to increase that until a BSpec update. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105771 Signed-off-by: Imre Deak <[email protected]> Link: https://patchwork.freedesktop.org/patch/msgid/[email protected] Reviewed-by: Ville Syrjälä <[email protected]>
olifre · Apr 10, 2018 · 1b85147 · 1b85147
1 parent 8b69449
commit 1b85147
Showing 1 changed file with 6 additions and 5 deletions.
diff --git a/drivers/gpu/drm/i915/intel_dpio_phy.c b/drivers/gpu/drm/i915/intel_dpio_phy.c
@@ -380,13 +380,14 @@ static void _bxt_ddi_phy_init(struct drm_i915_private *dev_priv,
 	 * all 1s.  Eventually they become accessible as they power up, then
 	 * the reserved bit will give the default 0.  Poll on the reserved bit
 	 * becoming 0 to find when the PHY is accessible.
-	 * HW team confirmed that the time to reach phypowergood status is
-	 * anywhere between 50 us and 100us.
+	 * The flag should get set in 100us according to the HW team, but
+	 * use 1ms due to occasional timeouts observed with that.
 	 */
-	if (wait_for_us(((I915_READ(BXT_PORT_CL1CM_DW0(phy)) &
-		(PHY_RESERVED | PHY_POWER_GOOD)) == PHY_POWER_GOOD), 100)) {
+	if (intel_wait_for_register_fw(dev_priv, BXT_PORT_CL1CM_DW0(phy),
+				       PHY_RESERVED | PHY_POWER_GOOD,
+				       PHY_POWER_GOOD,
+				       1))
 		DRM_ERROR("timeout during PHY%d power on\n", phy);
-	}
 
 	/* Program PLL Rcomp code offset */
 	val = I915_READ(BXT_PORT_CL1CM_DW9(phy));