openwrt/target/linux/bcm27xx/patches-5.4/950-0609-drm-vc4-Fixup-for-firmware-KMS.patch

From 3c10a82ae5ce60ee8b4dbd1d1f8436efaa4593c3 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Mon, 30 Mar 2020 12:52:26 +0100
Subject: [PATCH] drm/vc4: Fixup for firmware KMS

Fix up "drm/vc4: Kick the core clock up during a mode change" for
firmware KMS mode where we don't have the HVS or core clock
configured.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
 drivers/gpu/drm/vc4/vc4_kms.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/vc4/vc4_kms.c
+++ b/drivers/gpu/drm/vc4/vc4_kms.c
@@ -239,7 +239,8 @@ vc4_atomic_complete_commit(struct drm_at
 		vc4_hvs_mask_underrun(dev, vc4_crtc_state->assigned_channel);
 	}
 
-	clk_set_rate(hvs->core_clk, 500000000);
+	if (!vc4->firmware_kms)
+		clk_set_rate(hvs->core_clk, 500000000);
 
 	drm_atomic_helper_wait_for_fences(dev, state, false);
 
@@ -266,7 +267,8 @@ vc4_atomic_complete_commit(struct drm_at
 
 	drm_atomic_helper_commit_cleanup_done(state);
 
-	clk_set_rate(hvs->core_clk, 200000000);
+	if (!vc4->firmware_kms)
+		clk_set_rate(hvs->core_clk, 200000000);
 
 	drm_atomic_state_put(state);