Hi,
On Mon, Apr 08, 2024 at 01:44:35PM +0530, Jayesh Choudhary wrote:
> Currently, mode_valid hook returns all mode as valid. Add the check
> for the maximum and minimum pixel clock that the bridge can support
> while validating a mode.
>
> Signed-off-by: Jayesh Choudhary <j-choudhary@xxxxxx>
> ---
> drivers/gpu/drm/bridge/sii902x.c | 16 +++++++++++++++-
> 1 file changed, 15 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
> index 8f84e98249c7..658819199c84 100644
> --- a/drivers/gpu/drm/bridge/sii902x.c
> +++ b/drivers/gpu/drm/bridge/sii902x.c
> @@ -163,6 +163,16 @@
>
> #define SII902X_AUDIO_PORT_INDEX 3
>
> +/*
> + * The maximum resolution supported by the HDMI bridge is 1080p@60Hz
> + * and 1920x1200 requiring a pixel clock of 165MHz and the minimum
> + * resolution supported is 480p@60Hz requiring a pixel clock of 25MHz
> + *
> + * (drm_display_mode clock is in kHz)
> + */
> +#define SII902X_MIN_PIXEL_CLOCK 25000
> +#define SII902X_MAX_PIXEL_CLOCK 165000
> +
You should probably add a KHZ suffix or something to make it obvious.
The natural unit for a frequency is Hertz.
> struct sii902x {
> struct i2c_client *i2c;
> struct regmap *regmap;
> @@ -313,7 +323,11 @@ static int sii902x_get_modes(struct drm_connector *connector)
> static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,
> struct drm_display_mode *mode)
> {
> - /* TODO: check mode */
> + if (mode->clock < SII902X_MIN_PIXEL_CLOCK)
> + return MODE_CLOCK_LOW;
> +
> + if (mode->clock > SII902X_MAX_PIXEL_CLOCK)
> + return MODE_CLOCK_HIGH;
>
> return MODE_OK;
> }
It's something you should do in atomic_check too
Maxime
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