linux-kernel - [PATCH v3 3/3] amd/amdgpu_dm: Verify Gamma and Degamma LUT sizes using DRM Core check

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Date:   Tue, 26 Oct 2021 15:21:02 -0400
From:   Mark Yacoub <markyacoub@...omium.org>
To:     unlisted-recipients:; (no To-header on input)
Cc:     seanpaul@...omium.org, pmenzel@...gen.mpg.de,
        Mark Yacoub <markyacoub@...gle.com>,
        Mark Yacoub <markyacoub@...omium.org>,
        Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 3/3] amd/amdgpu_dm: Verify Gamma and Degamma LUT sizes using DRM Core check

From: Mark Yacoub <markyacoub@...gle.com>

[Why]
drm_atomic_helper_check_crtc now verifies both legacy and non-legacy LUT
sizes. There is no need to check it within amdgpu_dm_atomic_check.

[How]
Remove the local call to verify LUT sizes and use DRM Core function
instead.

Tested on ChromeOS Zork.

v1:
Remove amdgpu_dm_verify_lut_sizes everywhere.

Signed-off-by: Mark Yacoub <markyacoub@...omium.org>
Reviewed-by: Sean Paul <seanpaul@...omium.org>
---
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  8 ++---
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h |  1 -
 .../amd/display/amdgpu_dm/amdgpu_dm_color.c   | 35 -------------------
 3 files changed, 4 insertions(+), 40 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index f74663b6b046e..47f8de1cfc3a5 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -10244,6 +10244,10 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
 		}
 	}
 #endif
+	ret = drm_atomic_helper_check_crtcs(state);
+	if (ret)
+		return ret;
+
 	for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
 		dm_old_crtc_state = to_dm_crtc_state(old_crtc_state);
 
@@ -10253,10 +10257,6 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
 			dm_old_crtc_state->dsc_force_changed == false)
 			continue;
 
-		ret = amdgpu_dm_verify_lut_sizes(new_crtc_state);
-		if (ret)
-			goto fail;
-
 		if (!new_crtc_state->enable)
 			continue;
 
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
index fcb9c4a629c32..22730e5542092 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
@@ -617,7 +617,6 @@ void amdgpu_dm_trigger_timing_sync(struct drm_device *dev);
 #define MAX_COLOR_LEGACY_LUT_ENTRIES 256
 
 void amdgpu_dm_init_color_mod(void);
-int amdgpu_dm_verify_lut_sizes(const struct drm_crtc_state *crtc_state);
 int amdgpu_dm_update_crtc_color_mgmt(struct dm_crtc_state *crtc);
 int amdgpu_dm_update_plane_color_mgmt(struct dm_crtc_state *crtc,
 				      struct dc_plane_state *dc_plane_state);
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
index a022e5bb30a5c..319f8a8a89835 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
@@ -284,37 +284,6 @@ static int __set_input_tf(struct dc_transfer_func *func,
 	return res ? 0 : -ENOMEM;
 }
 
-/**
- * Verifies that the Degamma and Gamma LUTs attached to the |crtc_state| are of
- * the expected size.
- * Returns 0 on success.
- */
-int amdgpu_dm_verify_lut_sizes(const struct drm_crtc_state *crtc_state)
-{
-	const struct drm_color_lut *lut = NULL;
-	uint32_t size = 0;
-
-	lut = __extract_blob_lut(crtc_state->degamma_lut, &size);
-	if (lut && size != MAX_COLOR_LUT_ENTRIES) {
-		DRM_DEBUG_DRIVER(
-			"Invalid Degamma LUT size. Should be %u but got %u.\n",
-			MAX_COLOR_LUT_ENTRIES, size);
-		return -EINVAL;
-	}
-
-	lut = __extract_blob_lut(crtc_state->gamma_lut, &size);
-	if (lut && size != MAX_COLOR_LUT_ENTRIES &&
-	    size != MAX_COLOR_LEGACY_LUT_ENTRIES) {
-		DRM_DEBUG_DRIVER(
-			"Invalid Gamma LUT size. Should be %u (or %u for legacy) but got %u.\n",
-			MAX_COLOR_LUT_ENTRIES, MAX_COLOR_LEGACY_LUT_ENTRIES,
-			size);
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
 /**
  * amdgpu_dm_update_crtc_color_mgmt: Maps DRM color management to DC stream.
  * @crtc: amdgpu_dm crtc state
@@ -348,10 +317,6 @@ int amdgpu_dm_update_crtc_color_mgmt(struct dm_crtc_state *crtc)
 	bool is_legacy;
 	int r;
 
-	r = amdgpu_dm_verify_lut_sizes(&crtc->base);
-	if (r)
-		return r;
-
 	degamma_lut = __extract_blob_lut(crtc->base.degamma_lut, &degamma_size);
 	regamma_lut = __extract_blob_lut(crtc->base.gamma_lut, &regamma_size);
 
-- 
2.33.0.1079.g6e70778dc9-goog