[Intel-gfx] [PATCH] drm/i915/display: A check on mode->clock, if it exceeds max_dot_clock

[Ville Syrjälä]

On Wed, Nov 23, 2022 at 01:13:56PM +0530, Nischal Varide wrote:
> Making sure that the  mode-clock is not greater than the
> max_dot_clock freq.This patch will prevent attempts from
> userspace to modeset with mode->clock greater than
> max_dot_clock freq.

Already handled elsewhere.

> 
> Signed-off-by: Nischal Varide <nischal.varide at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_dp.c   | 10 ++++++++++
>  drivers/gpu/drm/i915/display/intel_hdmi.c |  3 +++
>  2 files changed, 13 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 7400d6b4c587..e603b7c01d27 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -2045,6 +2045,16 @@ intel_dp_compute_config(struct intel_encoder *encoder,
>  	if (intel_dp_hdisplay_bad(dev_priv, adjusted_mode->crtc_hdisplay))
>  		return -EINVAL;
>  
> +	if (!intel_dp_can_bigjoiner(intel_dp) &&
> +			(adjusted_mode->clock > dev_priv->max_dotclk_freq))
> +		return -EINVAL;
> +
> +	if (intel_dp_can_bigjoiner(intel_dp) &&
> +		(adjusted_mode->clock >  (2 * dev_priv->max_dotclk_freq)))
> +		return -EINVAL;
> +
> +
> +
>  	/*
>  	 * Try to respect downstream TMDS clock limits first, if
>  	 * that fails assume the user might know something we don't.
> diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
> index 02f8374ea51f..50603806a964 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
> @@ -2247,6 +2247,9 @@ int intel_hdmi_compute_config(struct intel_encoder *encoder,
>  	if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
>  		return -EINVAL;
>  
> +	if (adjusted_mode->clock > dev_priv->max_dotclk_freq)
> +		return -EINVAL;
> +
>  	pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
>  	pipe_config->has_hdmi_sink = intel_has_hdmi_sink(intel_hdmi,
>  							 conn_state);
> -- 
> 2.36.0

-- 
Ville Syrjälä
Intel