linux-kernel - Re: [PATCH v2 02/14] drm/fb-helper: remove drm_fb_helper_save_lut_atomic

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Message-ID: <20170626091848.nt73oskubcm3u5ki@phenom.ffwll.local>
Date:   Mon, 26 Jun 2017 11:18:48 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Peter Rosin <peda@...ntia.se>
Cc:     linux-kernel@...r.kernel.org, nouveau@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org,
        virtualization@...ts.linux-foundation.org,
        amd-gfx@...ts.freedesktop.org,
        Daniel Vetter <daniel.vetter@...el.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Russell King <linux@...linux.org.uk>,
        Ben Skeggs <bskeggs@...hat.com>,
        Dave Airlie <airlied@...hat.com>,
        intel-gfx@...ts.freedesktop.org,
        Vincent Abriou <vincent.abriou@...com>,
        Philippe Cornu <philippe.cornu@...com>,
        Yannick Fertre <yannick.fertre@...com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        Gerd Hoffmann <kraxel@...hat.com>
Subject: Re: [PATCH v2 02/14] drm/fb-helper: remove
 drm_fb_helper_save_lut_atomic

On Thu, Jun 22, 2017 at 08:06:25AM +0200, Peter Rosin wrote:
> drm_fb_helper_save_lut_atomic is redundant since the .gamma_store is
> now always kept up to date by drm_fb_helper_setcmap.
> 
> Signed-off-by: Peter Rosin <peda@...ntia.se>

Also note that this is for kgdb support only and so likely very buggy
(since no one cried when we started to break kgdb support when switching
drivers to atomic).
-Daniel

> ---
>  drivers/gpu/drm/drm_fb_helper.c | 17 -----------------
>  1 file changed, 17 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index 25315fb..7ade384 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -229,22 +229,6 @@ int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
>  }
>  EXPORT_SYMBOL(drm_fb_helper_remove_one_connector);
>  
> -static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
> -{
> -	uint16_t *r_base, *g_base, *b_base;
> -	int i;
> -
> -	if (helper->funcs->gamma_get == NULL)
> -		return;
> -
> -	r_base = crtc->gamma_store;
> -	g_base = r_base + crtc->gamma_size;
> -	b_base = g_base + crtc->gamma_size;
> -
> -	for (i = 0; i < crtc->gamma_size; i++)
> -		helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
> -}
> -
>  static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
>  {
>  	uint16_t *r_base, *g_base, *b_base;
> @@ -285,7 +269,6 @@ int drm_fb_helper_debug_enter(struct fb_info *info)
>  			if (drm_drv_uses_atomic_modeset(mode_set->crtc->dev))
>  				continue;
>  
> -			drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
>  			funcs->mode_set_base_atomic(mode_set->crtc,
>  						    mode_set->fb,
>  						    mode_set->x,
> -- 
> 2.1.4
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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