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31 lines
1.3 KiB
Diff
31 lines
1.3 KiB
Diff
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From 8101479299dec8b984ee1cef2224d67c8ae9921f Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Tue, 2 Nov 2021 16:01:36 +0000
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Subject: [PATCH 0013/1085] drm: Check whether the gamma lut has changed before
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updating
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drm_crtc_legacy_gamma_set updates the gamma_lut blob unconditionally,
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which leads to unnecessary reprogramming of hardware.
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Check whether the blob contents has actually changed before
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signalling that it has been updated.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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drivers/gpu/drm/drm_color_mgmt.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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--- a/drivers/gpu/drm/drm_color_mgmt.c
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+++ b/drivers/gpu/drm/drm_color_mgmt.c
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@@ -330,7 +330,9 @@ static int drm_crtc_legacy_gamma_set(str
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replaced = drm_property_replace_blob(&crtc_state->degamma_lut,
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use_gamma_lut ? NULL : blob);
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replaced |= drm_property_replace_blob(&crtc_state->ctm, NULL);
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- replaced |= drm_property_replace_blob(&crtc_state->gamma_lut,
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+ if (!crtc_state->gamma_lut || !crtc_state->gamma_lut->data ||
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+ memcmp(crtc_state->gamma_lut->data, blob_data, blob->length))
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+ replaced |= drm_property_replace_blob(&crtc_state->gamma_lut,
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use_gamma_lut ? blob : NULL);
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crtc_state->color_mgmt_changed |= replaced;
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