linux-kernel - Re: [PATCH v6 05/10] drm/msm/dp: use the eDP bridge ops to validate eDP modes

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ef5d82ec-22ab-298f-740d-e86cb7fe3046@linaro.org>
Date:   Mon, 11 Jul 2022 17:18:39 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Vinod Polimera <quic_vpolimer@...cinc.com>,
        dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, robdclark@...il.com,
        dianders@...omium.org, swboyd@...omium.org,
        quic_kalyant@...cinc.com, quic_khsieh@...cinc.com,
        quic_vproddut@...cinc.com, bjorn.andersson@...aro.org,
        quic_aravindh@...cinc.com, quic_abhinavk@...cinc.com,
        quic_sbillaka@...cinc.com
Subject: Re: [PATCH v6 05/10] drm/msm/dp: use the eDP bridge ops to validate
 eDP modes

On 11/07/2022 15:56, Vinod Polimera wrote:
> The eDP and DP interfaces shared the bridge operations and
> the eDP specific changes were implemented under is_edp check.
> To add psr support for eDP, we started using a new set of eDP
> bridge ops. We are moving the eDP specific code in the
> dp_bridge_mode_valid function to a new eDP function,
> edp_bridge_mode_valid under the eDP bridge ops.
> 
> Signed-off-by: Sankeerth Billakanti <quic_sbillaka@...cinc.com>
> Signed-off-by: Vinod Polimera <quic_vpolimer@...cinc.com>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

> ---
>   drivers/gpu/drm/msm/dp/dp_display.c |  8 --------
>   drivers/gpu/drm/msm/dp/dp_drm.c     | 34 +++++++++++++++++++++++++++++++++-
>   2 files changed, 33 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index 64a6254..2b3ec6b 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -986,14 +986,6 @@ enum drm_mode_status dp_bridge_mode_valid(struct drm_bridge *bridge,
>   		return -EINVAL;
>   	}
>   
> -	/*
> -	 * The eDP controller currently does not have a reliable way of
> -	 * enabling panel power to read sink capabilities. So, we rely
> -	 * on the panel driver to populate only supported modes for now.
> -	 */
> -	if (dp->is_edp)
> -		return MODE_OK;
> -
>   	if (mode->clock > DP_MAX_PIXEL_CLK_KHZ)
>   		return MODE_BAD;
>   
> diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
> index 8ca0b37..2bf8c8d 100644
> --- a/drivers/gpu/drm/msm/dp/dp_drm.c
> +++ b/drivers/gpu/drm/msm/dp/dp_drm.c
> @@ -181,12 +181,44 @@ static void edp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
>   	dp_bridge_atomic_post_disable(drm_bridge, old_bridge_state);
>   }
>   
> +/**
> + * edp_bridge_mode_valid - callback to determine if specified mode is valid
> + * @bridge: Pointer to drm bridge structure
> + * @info: display info
> + * @mode: Pointer to drm mode structure
> + * Returns: Validity status for specified mode
> + */
> +static enum drm_mode_status edp_bridge_mode_valid(struct drm_bridge *bridge,
> +					  const struct drm_display_info *info,
> +					  const struct drm_display_mode *mode)
> +{
> +	struct msm_dp *dp;
> +	int mode_pclk_khz = mode->clock;
> +
> +	dp = to_dp_bridge(bridge)->dp_display;
> +
> +	if (!dp || !mode_pclk_khz || !dp->connector) {
> +		DRM_ERROR("invalid params\n");
> +		return -EINVAL;
> +	}
> +
> +	if (mode->clock > DP_MAX_PIXEL_CLK_KHZ)
> +		return MODE_CLOCK_HIGH;
> +
> +	/*
> +	 * The eDP controller currently does not have a reliable way of
> +	 * enabling panel power to read sink capabilities. So, we rely
> +	 * on the panel driver to populate only supported modes for now.
> +	 */
> +	return MODE_OK;
> +}
> +
>   static const struct drm_bridge_funcs edp_bridge_ops = {
>   	.atomic_enable = edp_bridge_atomic_enable,
>   	.atomic_disable = edp_bridge_atomic_disable,
>   	.atomic_post_disable = edp_bridge_atomic_post_disable,
>   	.mode_set = dp_bridge_mode_set,
> -	.mode_valid = dp_bridge_mode_valid,
> +	.mode_valid = edp_bridge_mode_valid,
>   	.atomic_reset = drm_atomic_helper_bridge_reset,
>   	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
>   	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,


-- 
With best wishes
Dmitry