linux-kernel - [PATCH v1 1/1] drm/mediatek: fix CCORR mtk_ctm_s31_32_to_s1

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Message-ID: <20250921055416.25588-2-jay.liu@mediatek.com>
Date: Sun, 21 Sep 2025 13:53:05 +0800
From: Jay Liu <jay.liu@...iatek.com>
To: Chun-Kuang Hu <chunkuang.hu@...nel.org>, Philipp Zabel
	<p.zabel@...gutronix.de>, David Airlie <airlied@...il.com>, Simona Vetter
	<simona@...ll.ch>, Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Yongqiang Niu <yongqiang.niu@...iatek.com>, CK Hu <ck.hu@...iatek.com>,
	Hsin-Yi Wang <hsinyi@...omium.org>
CC: <dri-devel@...ts.freedesktop.org>, <linux-mediatek@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>, Jay
 Liu <jay.liu@...iatek.com>
Subject: [PATCH v1 1/1] drm/mediatek: fix CCORR mtk_ctm_s31_32_to_s1_n function issue

if matrixbit is 11,
The range of color matrix is from 0 to (BIT(12) - 1).
Values from 0 to (BIT(11) - 1) represent positive numbers,
values from BIT(11) to (BIT(12) - 1) represent negative numbers.
For example, -1 need converted to 8191.
so convert S31.32 to HW Q2.11 format by drm_color_ctm_s31_32_to_qm_n,
and set int_bits to 2.

Fixes: 738ed4156fba ("drm/mediatek: Add matrix_bits private data for ccorr")
Change-Id: Icb2aae1dee21d9ea34f263a54850fee26d97d455
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Signed-off-by: Jay Liu <jay.liu@...iatek.com>
---
 drivers/gpu/drm/mediatek/mtk_disp_ccorr.c | 26 +++--------------------
 1 file changed, 3 insertions(+), 23 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ccorr.c b/drivers/gpu/drm/mediatek/mtk_disp_ccorr.c
index 10d60d2c2a56..634b31346921 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_ccorr.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ccorr.c
@@ -80,28 +80,7 @@ void mtk_ccorr_stop(struct device *dev)
 	writel_relaxed(0x0, ccorr->regs + DISP_CCORR_EN);
 }
 
-/* Converts a DRM S31.32 value to the HW S1.n format. */
-static u16 mtk_ctm_s31_32_to_s1_n(u64 in, u32 n)
-{
-	u16 r;
-
-	/* Sign bit. */
-	r = in & BIT_ULL(63) ? BIT(n + 1) : 0;
-
-	if ((in & GENMASK_ULL(62, 33)) > 0) {
-		/* identity value 0x100000000 -> 0x400(mt8183), */
-		/* identity value 0x100000000 -> 0x800(mt8192), */
-		/* if bigger this, set it to max 0x7ff. */
-		r |= GENMASK(n, 0);
-	} else {
-		/* take the n+1 most important bits. */
-		r |= (in >> (32 - n)) & GENMASK(n, 0);
-	}
-
-	return r;
-}
-
-void mtk_ccorr_ctm_set(struct device *dev, struct drm_crtc_state *state)
+bool mtk_ccorr_ctm_set(struct device *dev, struct drm_crtc_state *state)
 {
 	struct mtk_disp_ccorr *ccorr = dev_get_drvdata(dev);
 	struct drm_property_blob *blob = state->ctm;
@@ -109,6 +88,7 @@ void mtk_ccorr_ctm_set(struct device *dev, struct drm_crtc_state *state)
 	const u64 *input;
 	uint16_t coeffs[9] = { 0 };
 	int i;
+	int int_bits = 2;
 	struct cmdq_pkt *cmdq_pkt = NULL;
 	u32 matrix_bits = ccorr->data->matrix_bits;
 
@@ -119,7 +99,7 @@ void mtk_ccorr_ctm_set(struct device *dev, struct drm_crtc_state *state)
 	input = ctm->matrix;
 
 	for (i = 0; i < ARRAY_SIZE(coeffs); i++)
-		coeffs[i] = mtk_ctm_s31_32_to_s1_n(input[i], matrix_bits);
+		coeffs[i] = drm_color_ctm_s31_32_to_qm_n(input[i], int_bits, matrix_bits);
 
 	mtk_ddp_write(cmdq_pkt, coeffs[0] << 16 | coeffs[1],
 		      &ccorr->cmdq_reg, ccorr->regs, DISP_CCORR_COEF_0);
-- 
2.46.0