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From 39a1d2daa0440779a0790ca32543f30220b451da Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Tue, 2 Nov 2021 16:01:36 +0000
Subject: [PATCH] drm: Check whether the gamma lut has changed before
updating
drm_crtc_legacy_gamma_set updates the gamma_lut blob unconditionally,
which leads to unnecessary reprogramming of hardware.
Check whether the blob contents has actually changed before
signalling that it has been updated.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
drivers/gpu/drm/drm_color_mgmt.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/drm_color_mgmt.c
+++ b/drivers/gpu/drm/drm_color_mgmt.c
@@ -330,7 +330,9 @@ static int drm_crtc_legacy_gamma_set(str
replaced = drm_property_replace_blob(&crtc_state->degamma_lut,
use_gamma_lut ? NULL : blob);
replaced |= drm_property_replace_blob(&crtc_state->ctm, NULL);
- replaced |= drm_property_replace_blob(&crtc_state->gamma_lut,
+ if (!crtc_state->gamma_lut || !crtc_state->gamma_lut->data ||
+ memcmp(crtc_state->gamma_lut->data, blob_data, blob->length))
+ replaced |= drm_property_replace_blob(&crtc_state->gamma_lut,
use_gamma_lut ? blob : NULL);
crtc_state->color_mgmt_changed |= replaced;
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