[PATCH v10 09/18] drm: exynos: dsi: Add atomic check

[Frieder Schrempf]

On 14.12.22 13:58, Jagan Teki wrote:
> Look like an explicit fixing up of mode_flags is required for DSIM IP
> present in i.MX8M Mini/Nano SoCs.
> 
> At least the LCDIF + DSIM needs active low sync polarities in order
> to correlate the correct sync flags of the surrounding components in
> the chain to make sure the whole pipeline can work properly.
> 
> On the other hand the i.MX 8M Mini Applications Processor Reference Manual,
> Rev. 3, 11/2020 says.
> "13.6.3.5.2 RGB interface
>  Vsync, Hsync, and VDEN are active high signals."
> 
> i.MX 8M Mini Applications Processor Reference Manual Rev. 3, 11/2020
> 3.6.3.5.2 RGB interface
> i.MX 8M Nano Applications Processor Reference Manual Rev. 2, 07/2022
> 13.6.2.7.2 RGB interface
> both claim "Vsync, Hsync, and VDEN are active high signals.", the
> LCDIF must generate inverted HS/VS/DE signals, i.e. active LOW.
> 
> No clear evidence about whether it can be documentation issues or
> something, so added a comment FIXME for this and updated the active low
> sync polarities using SAMSUNG_DSIM_TYPE_IMX8MM hw_type.
> 
> Comments are suggested by Marek Vasut.
> 
> Signed-off-by: Jagan Teki <jagan at amarulasolutions.com>

Reviewed-by: Frieder Schrempf <frieder.schrempf at kontron.de>