linux-kernel - Re: [PATCH v6 14/23] drm/modes: Properly generate a drm_display

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Date:   Wed, 26 Oct 2022 23:25:20 +0200
From:   Mateusz Kwiatkowski <kfyatek@...il.com>
To:     maxime@...no.tech, Karol Herbst <kherbst@...hat.com>,
        Emma Anholt <emma@...olt.net>, Ben Skeggs <bskeggs@...hat.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        Samuel Holland <samuel@...lland.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Maxime Ripard <mripard@...nel.org>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Lyude Paul <lyude@...hat.com>
Cc:     linux-sunxi@...ts.linux.dev, intel-gfx@...ts.freedesktop.org,
        Phil Elwell <phil@...pberrypi.com>,
        linux-arm-kernel@...ts.infradead.org,
        nouveau@...ts.freedesktop.org, Hans de Goede <hdegoede@...hat.com>,
        Dom Cobley <dom@...pberrypi.com>,
        dri-devel@...ts.freedesktop.org,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        linux-kernel@...r.kernel.org,
        Noralf Trønnes <noralf@...nnes.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [PATCH v6 14/23] drm/modes: Properly generate a drm_display_mode
 from a named mode

Hi Maxime,

> +static struct drm_display_mode *drm_named_mode(struct drm_device *dev,
> +					       struct drm_cmdline_mode *cmd)
> +{
> +	struct drm_display_mode *mode;
> +	unsigned int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(drm_named_modes); i++) {
> +		const struct drm_named_mode *named_mode = &drm_named_modes[i];
> +
> +		if (strcmp(cmd->name, named_mode->name))
> +			continue;
> +
> +		if (!named_mode->tv_mode)
> +			continue;
> +
> +		mode = drm_analog_tv_mode(dev,
> +					  named_mode->tv_mode,
> +					  named_mode->pixel_clock_khz * 1000,
> +					  named_mode->xres,
> +					  named_mode->yres,
> +					  named_mode->flags & DRM_MODE_FLAG_INTERLACE);
> +		if (!mode)
> +			return NULL;
> +
> +		return mode;
> +	}
> +
> +	return NULL;
> +}
> +

You didn't add tv_mode_specified to struct drm_named_mode, and left the
if (!named_mode->tv_mode) condition here. This will break on NTSC.

Best regards,
Mateusz Kwiatkowski