linux-kernel - Re: [PATCH v4 1/9] drm/mediatek: dsi: Use GENMASK() for register mask definitions

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Date: Tue, 6 Feb 2024 16:53:56 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Alexandre Mergnat <amergnat@...libre.com>, chunkuang.hu@...nel.org
Cc: fshao@...omium.org, p.zabel@...gutronix.de, airlied@...il.com,
 daniel@...ll.ch, matthias.bgg@...il.com, dri-devel@...ts.freedesktop.org,
 linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH v4 1/9] drm/mediatek: dsi: Use GENMASK() for register mask
 definitions

Il 06/02/24 15:47, Alexandre Mergnat ha scritto:
> 
> 
> On 06/02/2024 13:07, AngeloGioacchino Del Regno wrote:
>> Change magic numerical masks with usage of the GENMASK() macro
>> to improve readability.
>>
>> While at it, also fix the DSI_PS_SEL mask to include all bits instead
>> of just a subset of them.
>>
>> This commit brings no functional changes.
>>
>> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
>> ---
>>   drivers/gpu/drm/mediatek/mtk_dsi.c | 45 +++++++++++++++---------------
>>   1 file changed, 23 insertions(+), 22 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
>> index a2fdfc8ddb15..3b7392c03b4d 100644
>> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
>> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
>> @@ -58,18 +58,18 @@
> 
> ...snip...
> 
>>   #define DSI_PSCTRL        0x1c
>> -#define DSI_PS_WC            0x3fff
>> -#define DSI_PS_SEL            (3 << 16)
>> +#define DSI_PS_WC            GENMASK(14, 0)
>> +#define DSI_PS_SEL            GENMASK(19, 16)
> 
> 0011 0000 0000 0000 0000 => GENMASK(17, 16)

Alexandre, the reason for that is in the commit description :-P

"While at it, also fix the DSI_PS_SEL mask to include all bits instead
of just a subset of them."

Thanks for the reviews, btw!

Cheers!
Angelo

> 
>>   #define PACKED_PS_16BIT_RGB565        (0 << 16)
>>   #define LOOSELY_PS_18BIT_RGB666        (1 << 16)
>>   #define PACKED_PS_18BIT_RGB666        (2 << 16)
>> @@ -109,26 +109,26 @@
>>   #define LD0_WAKEUP_EN            BIT(2)
>