On Fri, Mar 03, 2023 at 04:00:19PM +0100, Maxime Ripard wrote:
> On Fri, Mar 03, 2023 at 08:21:30PM +0530, Jagan Teki wrote:
> > LCDIF-DSIM glue logic inverts the HS/VS/DE signals and expecting
> > the i.MX8M Mini/Nano DSI host to add additional Data Enable signal
> > active low (DE_LOW). This makes the valid data transfer on each
> > horizontal line.
> > 
> > So, add additional bus flags DE_LOW setting via input_bus_flags
> > for i.MX8M Mini/Nano platforms.
> > 
> > Reviewed-by: Marek Vasut <marex@denx.de>
> > Reviewed-by: Frieder Schrempf <frieder.schrempf@kontron.de>
> > Suggested-by: Marek Vasut <marex@denx.de>
> > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> > ---
> > Changes for v15, v13:
> > - none
> > Changes for v12:
> > - collect RB from Marek
> > Changes for v11:
> > - collect RB from Frieder
> > Changes for v10, v9:
> > - none
> > Changes for v8:
> > - add DE_LOW for i.MX8M Mini/Nano platforms.
> > Changes for v7, v6:
> > - none
> > Changes for v5:
> > - rebased based on updated bridge changes
> > Changes for v4 - v1:
> > - none
> > 
> >  drivers/gpu/drm/exynos/exynos_drm_dsi.c | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> > index 796480e4a18b..5d971b607e1a 100644
> > --- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> > +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> > @@ -1736,6 +1736,10 @@ static const struct component_ops exynos_dsi_component_ops = {
> >  	.unbind	= exynos_dsi_unbind,
> >  };
> >  
> > +static const struct drm_bridge_timings dsim_bridge_timings_de_low = {
> > +	.input_bus_flags = DRM_BUS_FLAG_DE_LOW,
> > +};
> > +
> >  static int exynos_dsi_probe(struct platform_device *pdev)
> >  {
> >  	struct device *dev = &pdev->dev;
> > @@ -1822,6 +1826,10 @@ static int exynos_dsi_probe(struct platform_device *pdev)
> >  	dsi->bridge.type = DRM_MODE_CONNECTOR_DSI;
> >  	dsi->bridge.pre_enable_prev_first = true;
> >  
> > +	/* DE_LOW: i.MX8M Mini/Nano LCDIF-DSIM glue logic inverts HS/VS/DE */
> > +	if (dsi->plat_data->hw_type == DSIM_TYPE_IMX8MM)
> 
> That commit isn't bisectable, you add that enum variant in the last
> patch so this won't compile.

Scratch that, it's defined in the previous patch, sorry

Maxime