On 7/4/21 11:57 AM, Jagan Teki wrote:
Hi Marek,
On Sun, Jul 4, 2021 at 3:23 PM Marek Vasut marex@denx.de wrote:
On 7/4/21 11:38 AM, Jagan Teki wrote:
24-bit SPWG, JEIDA bus formats are considered as 24-bit bus widths for LCDC_CTRL register in mxsfb.
Add support for it.
Signed-off-by: Jagan Teki jagan@amarulasolutions.com
drivers/gpu/drm/mxsfb/mxsfb_kms.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_kms.c b/drivers/gpu/drm/mxsfb/mxsfb_kms.c index 22cb749fc9bc..5657155f9633 100644 --- a/drivers/gpu/drm/mxsfb/mxsfb_kms.c +++ b/drivers/gpu/drm/mxsfb/mxsfb_kms.c @@ -85,6 +85,8 @@ static void mxsfb_set_formats(struct mxsfb_drm_private *mxsfb, ctrl |= CTRL_BUS_WIDTH_18; break; case MEDIA_BUS_FMT_RGB888_1X24:
case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:On MX8MM/MN, the bus between LCDIF and DSIM is plain parallel bus, so this patch is wrong.
Unsure since these flags are setting from panel side.
On MX8MM/MN, the panel is NOT connected directly to the LCDIF. There is LCDIF->(DPI bus)->DSIM bridge->(DSI bus)->DSI-to-LVDS-bridge->(LVDS bus)->LVDS panel It is the DSI bus past DSIM that is coming out of the SoC.
You want to pick drm: mxsfb: Use bus_format from the nearest bridge if present and then implement .atomic_get_input_bus_fmts on all your bridges. And only then you will get the correct MEDIA_BUS_FMT_RGB888_1X24 here.
I did pick this patch along with all your mxsfb recent changes, but issue still persist. It work only when I set the LCDC_CTRL explicitly like the patch does.
You must implement .atomic_get_input_bus_fmts on all your bridges . Then the format gets propagated correctly.
Look at e.g. drm/bridge: ti-sn65dsi83: Replace connector format patching with atomic_get_input_bus_fmts same thing applies to the DSIM, and possibly whatever other bridge you might have in the LCDIF->...->LVDS panel path.