linux-kernel - Re: [PATCH v5 13/14] drm: stm: remove dead code and pointless local lut storage

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Date:   Mon, 17 Jul 2017 09:47:06 +0000
From:   Philippe CORNU <philippe.cornu@...com>
To:     Peter Rosin <peda@...ntia.se>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Yannick FERTRE <yannick.fertre@...com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Vincent ABRIOU <vincent.abriou@...com>,
        "David Airlie" <airlied@...ux.ie>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        Lionel Landwerlin <lionel.g.landwerlin@...el.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>
Subject: Re: [PATCH v5 13/14] drm: stm: remove dead code and pointless local
 lut storage



On 07/13/2017 06:25 PM, Peter Rosin wrote:
> The redundant fb helper .load_lut is no longer used, and can not
> work right without also providing the fb helpers .gamma_set and
> .gamma_get thus rendering the code in this driver suspect.
> 
> Just remove the dead code.
> 
> Acked-by: Daniel Vetter <daniel.vetter@...ll.ch>
> Signed-off-by: Peter Rosin <peda@...ntia.se>


Acked-by: Philippe Cornu <philippe.cornu@...com>

Note: we will update stm32 clut support after your patch. Many thanks.

> ---
>   drivers/gpu/drm/stm/ltdc.c | 12 ------------
>   drivers/gpu/drm/stm/ltdc.h |  1 -
>   2 files changed, 13 deletions(-)
> 
> diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
> index 533176015cbb..3e95b4d1f4cc 100644
> --- a/drivers/gpu/drm/stm/ltdc.c
> +++ b/drivers/gpu/drm/stm/ltdc.c
> @@ -375,17 +375,6 @@ static irqreturn_t ltdc_irq(int irq, void *arg)
>    * DRM_CRTC
>    */
>   
> -static void ltdc_crtc_load_lut(struct drm_crtc *crtc)
> -{
> -	struct ltdc_device *ldev = crtc_to_ltdc(crtc);
> -	unsigned int i, lay;
> -
> -	for (lay = 0; lay < ldev->caps.nb_layers; lay++)
> -		for (i = 0; i < 256; i++)
> -			reg_write(ldev->regs, LTDC_L1CLUTWR + lay * LAY_OFS,
> -				  ldev->clut[i]);
> -}
> -
>   static void ltdc_crtc_atomic_enable(struct drm_crtc *crtc,
>   				    struct drm_crtc_state *old_state)
>   {
> @@ -525,7 +514,6 @@ static void ltdc_crtc_atomic_flush(struct drm_crtc *crtc,
>   }
>   
>   static struct drm_crtc_helper_funcs ltdc_crtc_helper_funcs = {
> -	.load_lut = ltdc_crtc_load_lut,
>   	.mode_set_nofb = ltdc_crtc_mode_set_nofb,
>   	.atomic_flush = ltdc_crtc_atomic_flush,
>   	.atomic_enable = ltdc_crtc_atomic_enable,
> diff --git a/drivers/gpu/drm/stm/ltdc.h b/drivers/gpu/drm/stm/ltdc.h
> index d7a9c736ac1e..620ca5555abf 100644
> --- a/drivers/gpu/drm/stm/ltdc.h
> +++ b/drivers/gpu/drm/stm/ltdc.h
> @@ -27,7 +27,6 @@ struct ltdc_device {
>   	struct drm_panel *panel;
>   	struct mutex err_lock;	/* protecting error_status */
>   	struct ltdc_caps caps;
> -	u32 clut[256];		/* color look up table */
>   	u32 error_status;
>   	u32 irq_status;
>   };
>