From: AngeloGioacchino Del Regno angelogioacchino.delregno@collabora.com
[ Upstream commit fae6f815505301b92d9113764f4d76d0bfe45607 ]
The register bits definitions for RGB666 formats are wrong in multiple ways: first, in the DSI_PS_SEL bits region, the Packed 18-bits RGB666 format is selected with bit 1, while the Loosely Packed one is bit 2, and second - the definition name "LOOSELY_PS_18BIT_RGB666" is wrong because the loosely packed format is 24 bits instead!
Either way, functions mtk_dsi_ps_control_vact() and mtk_dsi_ps_control() do not even agree on the DSI_PS_SEL bit to set in DSI_PSCTRL: one sets loosely packed (24) on RGB666, the other sets packed (18), and the other way around for RGB666_PACKED.
Fixing this entire stack of issues is done in one go: - Use the correct bit for the Loosely Packed RGB666 definition - Rename LOOSELY_PS_18BIT_RGB666 to LOOSELY_PS_24BIT_RGB666 - Change ps_bpp_mode in mtk_dsi_ps_control_vact() to set: - Loosely Packed, 24-bits for MIPI_DSI_FMT_RGB666 - Packed, 18-bits for MIPI_DSI_FMT_RGB666_PACKED
Fixes: 2e54c14e310f ("drm/mediatek: Add DSI sub driver") Reviewed-by: Alexandre Mergnat amergnat@baylibre.com Reviewed-by: CK Hu ck.hu@mediatek.com Signed-off-by: AngeloGioacchino Del Regno angelogioacchino.delregno@collabora.com Link: https://patchwork.kernel.org/project/dri-devel/patch/20240215085316.56835-3-... Signed-off-by: Chun-Kuang Hu chunkuang.hu@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/mediatek/mtk_dsi.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c index 290f328c6a421..0d96264ec5c6d 100644 --- a/drivers/gpu/drm/mediatek/mtk_dsi.c +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c @@ -71,8 +71,8 @@ #define DSI_PS_WC 0x3fff #define DSI_PS_SEL (3 << 16) #define PACKED_PS_16BIT_RGB565 (0 << 16) -#define LOOSELY_PS_18BIT_RGB666 (1 << 16) -#define PACKED_PS_18BIT_RGB666 (2 << 16) +#define PACKED_PS_18BIT_RGB666 (1 << 16) +#define LOOSELY_PS_24BIT_RGB666 (2 << 16) #define PACKED_PS_24BIT_RGB888 (3 << 16)
#define DSI_VSA_NL 0x20 @@ -367,10 +367,10 @@ static void mtk_dsi_ps_control_vact(struct mtk_dsi *dsi) ps_bpp_mode |= PACKED_PS_24BIT_RGB888; break; case MIPI_DSI_FMT_RGB666: - ps_bpp_mode |= PACKED_PS_18BIT_RGB666; + ps_bpp_mode |= LOOSELY_PS_24BIT_RGB666; break; case MIPI_DSI_FMT_RGB666_PACKED: - ps_bpp_mode |= LOOSELY_PS_18BIT_RGB666; + ps_bpp_mode |= PACKED_PS_18BIT_RGB666; break; case MIPI_DSI_FMT_RGB565: ps_bpp_mode |= PACKED_PS_16BIT_RGB565; @@ -424,7 +424,7 @@ static void mtk_dsi_ps_control(struct mtk_dsi *dsi) dsi_tmp_buf_bpp = 3; break; case MIPI_DSI_FMT_RGB666: - tmp_reg = LOOSELY_PS_18BIT_RGB666; + tmp_reg = LOOSELY_PS_24BIT_RGB666; dsi_tmp_buf_bpp = 3; break; case MIPI_DSI_FMT_RGB666_PACKED: