Hi Geert,
On Tuesday, 4 December 2018 19:30:25 EET Geert Uytterhoeven wrote:
> On Tue, Dec 4, 2018 at 5:36 PM Laurent Pinchart wrote:
> > Implement a .mode_valid() handler in the R-Car glue layer to reject
> > modes with an unsupported clock frequency.
> >
> > Signed-off-by: Laurent Pinchart
> > <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
>
> Thanks for your patch!
>
> > --- a/drivers/gpu/drm/rcar-du/rcar_dw_hdmi.c
> > +++ b/drivers/gpu/drm/rcar-du/rcar_dw_hdmi.c
> > @@ -35,6 +35,20 @@ static const struct rcar_hdmi_phy_params
> > rcar_hdmi_phy_params[] = {
> > { ~0UL, 0x0000, 0x0000, 0x0000 },
> > };
> >
> > +static enum drm_mode_status
> > +rcar_hdmi_mode_valid(struct drm_connector *connector,
> > + const struct drm_display_mode *mode)
> > +{
> > + /*
> > + * The maximum supported clock frequency is 297 MHz, as shown in
> > the PHY + * parameters table.
> > + */
> > + if (mode->clock > 297000)
> > + return MODE_CLOCK_HIGH;
>
> Perhaps you need a check for the lower limit (25 MHz), too?
There's no lower limit implied by the rcar_hdmi_phy_params table.
> > +
> > + return MODE_OK;
> > +}
--
Regards,
Laurent Pinchart
