linux-kernel - Re: [RESEND PATCH 3/3] drm/mediatek: mtk

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Date:   Wed, 8 Jul 2020 17:12:41 +0200
From:   Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:     Boris Brezillon <boris.brezillon@...labora.com>
Cc:     linux-kernel@...r.kernel.org,
        Collabora Kernel ML <kernel@...labora.com>,
        narmstrong@...libre.com, a.hajda@...sung.com,
        laurent.pinchart@...asonboard.com, matthias.bgg@...il.com,
        drinkcat@...omium.org, hsinyi@...omium.org,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [RESEND PATCH 3/3] drm/mediatek: mtk_dpi: Use simple encoder

Hi Boris,

Thank you to spend some time to review the patches.

On 1/7/20 13:41, Boris Brezillon wrote:
> On Mon, 18 May 2020 19:39:09 +0200
> Enric Balletbo i Serra <enric.balletbo@...labora.com> wrote:
> 
>> The mtk_dpi driver uses an empty implementation for its encoder. Replace
>> the code with the generic simple encoder.
>>
>> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
>> Reviewed-by: Chun-Kuang Hu <chunkuang.hu@...nel.org>
>> ---
>>
>>  drivers/gpu/drm/mediatek/mtk_dpi.c | 14 +++-----------
>>  1 file changed, 3 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
>> index baad198c69eb..80778b2aac2a 100644
>> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
>> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
>> @@ -20,6 +20,7 @@
>>  #include <drm/drm_bridge.h>
>>  #include <drm/drm_crtc.h>
>>  #include <drm/drm_of.h>
>> +#include <drm/drm_simple_kms_helper.h>
>>  
>>  #include "mtk_dpi_regs.h"
>>  #include "mtk_drm_ddp_comp.h"
>> @@ -510,15 +511,6 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
>>  	return 0;
>>  }
>>  
>> -static void mtk_dpi_encoder_destroy(struct drm_encoder *encoder)
>> -{
>> -	drm_encoder_cleanup(encoder);
>> -}
>> -
>> -static const struct drm_encoder_funcs mtk_dpi_encoder_funcs = {
>> -	.destroy = mtk_dpi_encoder_destroy,
>> -};
>> -
>>  static int mtk_dpi_bridge_attach(struct drm_bridge *bridge,
>>  				 enum drm_bridge_attach_flags flags)
>>  {
>> @@ -591,8 +583,8 @@ static int mtk_dpi_bind(struct device *dev, struct device *master, void *data)
>>  		return ret;
>>  	}
>>  
>> -	ret = drm_encoder_init(drm_dev, &dpi->encoder, &mtk_dpi_encoder_funcs,
>> -			       DRM_MODE_ENCODER_TMDS, NULL);
>> +	ret = drm_simple_encoder_init(drm_dev, &dpi->encoder,
>> +				      DRM_MODE_ENCODER_TMDS);
> 
> Not related to this change, but shouldn't we have DRM_MODE_ENCODER_DPI
> here?
> 

Right, I'll add a patch to fix this.

>>  	if (ret) {
>>  		dev_err(dev, "Failed to initialize decoder: %d\n", ret);
>>  		goto err_unregister;
>