On 29.10.2018 12:46, Tomi Valkeinen wrote:
> The current driver accepts any videomode with pclk < 154MHz. This is not
> correct, as with 1 lane and/or 1.62Mbps speed not all videomodes can be
> supported.
>
> Add code to reject modes that require more bandwidth that is available.
>
> Signed-off-by: Tomi Valkeinen <[email protected]>
> ---
> drivers/gpu/drm/bridge/tc358767.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/drivers/gpu/drm/bridge/tc358767.c
> b/drivers/gpu/drm/bridge/tc358767.c
> index ab299f4debfa..b026b5ef7378 100644
> --- a/drivers/gpu/drm/bridge/tc358767.c
> +++ b/drivers/gpu/drm/bridge/tc358767.c
> @@ -1114,10 +1114,20 @@ static bool tc_bridge_mode_fixup(struct drm_bridge
> *bridge,
> static enum drm_mode_status tc_connector_mode_valid(struct drm_connector
> *connector,
> struct drm_display_mode *mode)
> {
> + struct tc_data *tc = connector_to_tc(connector);
> + u32 req, avail;
> + u32 bits_per_pixel = 24;
> +
> /* DPI interface clock limitation: upto 154 MHz */
> if (mode->clock > 154000)
> return MODE_CLOCK_HIGH;
>
> + req = mode->clock * bits_per_pixel / 8 / 1000;
> + avail = tc->link.base.num_lanes * tc->link.base.rate / 1000;
You can remove "/ 1000" from both lines.
Reviewed-by: Andrzej Hajda <[email protected]>
--
Regards
Andrzej
> +
> + if (req > avail)
> + return MODE_BAD;
> +
> return MODE_OK;
> }
>
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