Hi, Hsin-Yi:
On Thu, 2021-01-28 at 19:23 +0800, Hsin-Yi Wang wrote:
From: Yongqiang Niu yongqiang.niu@mediatek.com
for 5 or 6 bpc panel, we need enable dither function to improve the display quality
Signed-off-by: Yongqiang Niu yongqiang.niu@mediatek.com Signed-off-by: Hsin-Yi Wang hsinyi@chromium.org
drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c index ac2cb25620357..6c8f246380a74 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c @@ -53,6 +53,7 @@ #define DITHER_EN BIT(0) #define DISP_DITHER_CFG 0x0020 #define DITHER_RELAY_MODE BIT(0) +#define DITHER_ENGINE_EN BIT(1) #define DISP_DITHER_SIZE 0x0030
#define LUT_10BIT_MASK 0x03ff @@ -314,9 +315,19 @@ static void mtk_dither_config(struct device *dev, unsigned int w, unsigned int bpc, struct cmdq_pkt *cmdq_pkt) { struct mtk_ddp_comp_dev *priv = dev_get_drvdata(dev);
- bool enable = (bpc == 5 || bpc == 6);
I strongly believe that dither function in dither is identical to the one in gamma and od, and in mtk_dither_set_common(), 'bpc >= MTK_MIN_BPC' is valid, so I believe we need not to limit bpc to 5 or 6. But we should consider the case that bpc is invalid in mtk_dither_set_common(). Invalid case in gamma and od use different way to process. For gamma, dither is default relay mode, so invalid bpc would do nothing in mtk_dither_set_common() and result in relay mode. For od, it set to relay mode first, them invalid bpc would do nothing in mtk_dither_set_common() and result in relay mode. I would like dither, gamma and od to process invalid bpc in the same way. One solution is to set relay mode in mtk_dither_set_common() for invalid bpc.
Regards, CK
- mtk_ddp_write(cmdq_pkt, h << 16 | w, &priv->cmdq_reg, priv->regs, DISP_DITHER_SIZE);
- mtk_ddp_write(cmdq_pkt, DITHER_RELAY_MODE, &priv->cmdq_reg, priv->regs, DISP_DITHER_CFG);
- if (enable) {
mtk_dither_set_common(priv->regs, &priv->cmdq_reg, bpc,DISP_DITHER_CFG, DITHER_ENGINE_EN,cmdq_pkt);- } else {
mtk_ddp_write(cmdq_pkt, DITHER_RELAY_MODE, &priv->cmdq_reg,priv->regs, DISP_DITHER_CFG);- }
- mtk_ddp_write(cmdq_pkt, h << 16 | w, &priv->cmdq_reg, priv->regs,
DISP_DITHER_SIZE);}
static void mtk_dither_start(struct device *dev)