drm/i915/cx0_phy: Fix C10 pll programming sequence

[ Upstream commit 385a95c ]

According to spec VDR_CUSTOM_WIDTH register gets programmed after pll
specific VDR registers and TX Lane programming registers are done.
Moreover we only program into C10_VDR_CONTROL1 to update config and
setup master lane once all VDR registers are written into.

Bspec: 67636
Fixes: 51390cc ("drm/i915/mtl: Add Support for C10 PHY message bus and pll programming")
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241216181554.2861381-1-suraj.kandpal@intel.com
(cherry picked from commit f9d4185)
Signed-off-by: Tvrtko Ursulin <tursulin@ursulin.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: surajk8

drivers/gpu/drm/i915/display/intel_cx0_phy.c

@@ -2084,14 +2084,6 @@ static void intel_c10_pll_program(struct drm_i915_private *i915,
 		      0, C10_VDR_CTRL_MSGBUS_ACCESS,
 		      MB_WRITE_COMMITTED);
 
-	/* Custom width needs to be programmed to 0 for both the phy lanes */
-	intel_cx0_rmw(encoder, INTEL_CX0_BOTH_LANES, PHY_C10_VDR_CUSTOM_WIDTH,
-		      C10_VDR_CUSTOM_WIDTH_MASK, C10_VDR_CUSTOM_WIDTH_8_10,
-		      MB_WRITE_COMMITTED);
-	intel_cx0_rmw(encoder, INTEL_CX0_BOTH_LANES, PHY_C10_VDR_CONTROL(1),
-		      0, C10_VDR_CTRL_UPDATE_CFG,
-		      MB_WRITE_COMMITTED);
-
 	/* Program the pll values only for the master lane */
 	for (i = 0; i < ARRAY_SIZE(pll_state->pll); i++)
 		intel_cx0_write(encoder, INTEL_CX0_LANE0, PHY_C10_VDR_PLL(i),
@@ -2101,6 +2093,10 @@ static void intel_c10_pll_program(struct drm_i915_private *i915,
 	intel_cx0_write(encoder, INTEL_CX0_LANE0, PHY_C10_VDR_CMN(0), pll_state->cmn, MB_WRITE_COMMITTED);
 	intel_cx0_write(encoder, INTEL_CX0_LANE0, PHY_C10_VDR_TX(0), pll_state->tx, MB_WRITE_COMMITTED);
 
+	/* Custom width needs to be programmed to 0 for both the phy lanes */
+	intel_cx0_rmw(encoder, INTEL_CX0_BOTH_LANES, PHY_C10_VDR_CUSTOM_WIDTH,
+		      C10_VDR_CUSTOM_WIDTH_MASK, C10_VDR_CUSTOM_WIDTH_8_10,
+		      MB_WRITE_COMMITTED);
 	intel_cx0_rmw(encoder, INTEL_CX0_LANE0, PHY_C10_VDR_CONTROL(1),
 		      0, C10_VDR_CTRL_MASTER_LANE | C10_VDR_CTRL_UPDATE_CFG,
 		      MB_WRITE_COMMITTED);