[PATCH v2 2/7] drm/mediatek: fix CCORR mtk_ctm_s31_32_to_s1_n function issue

[Jay Liu]

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")
Reviewed-by: AngeloGioacchino Del Regno 
<angelogioacchino.delre...@collabora.com>
Signed-off-by: Jay Liu <jay....@mediatek.com>
Signed-off-by: 20220315152503 created <jay....@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_disp_ccorr.c | 24 ++---------------------
 1 file changed, 2 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ccorr.c 
b/drivers/gpu/drm/mediatek/mtk_disp_ccorr.c
index 85ba109d6383..b097c20877f3 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_ccorr.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ccorr.c
@@ -80,27 +80,6 @@ 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;
-}
-
 bool mtk_ccorr_ctm_set(struct device *dev, struct drm_crtc_state *state)
 {
        struct mtk_disp_ccorr *ccorr = dev_get_drvdata(dev);
@@ -109,6 +88,7 @@ bool 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 @@ bool 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