linux-kernel - Re: [PATCH 7/8] drm/ssd13xx: Add support for the SSD132x OLED controller family

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Message-ID: <87h6mxsfvh.fsf@minerva.mail-host-address-is-not-set>
Date:   Wed, 11 Oct 2023 10:49:38 +0200
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Thomas Zimmermann <tzimmermann@...e.de>,
        linux-kernel@...r.kernel.org, Maxime Ripard <mripard@...nel.org>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 7/8] drm/ssd13xx: Add support for the SSD132x OLED
 controller family

Geert Uytterhoeven <geert@...ux-m68k.org> writes:

> Hi Javier,
>
> On Mon, Oct 9, 2023 at 8:36 PM Javier Martinez Canillas
> <javierm@...hat.com> wrote:
>> The Solomon SSD132x controllers (such as the SSD1322, SSD1325 and SSD1327)
>> are used by 16 grayscale dot matrix OLED panels, extend the driver to also
>> support this chip family.
>>
>> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
>
> Thanks for your patch!
>
>> --- a/drivers/gpu/drm/solomon/ssd13xx.c
>> +++ b/drivers/gpu/drm/solomon/ssd13xx.c
>
>> @@ -631,9 +821,12 @@ static int ssd13xx_fb_blit_rect(struct drm_framebuffer *fb,
>>         unsigned int dst_pitch;
>>         int ret = 0;
>>
>> -       /* Align y to display page boundaries */
>> -       rect->y1 = round_down(rect->y1, SSD130X_PAGE_HEIGHT);
>> -       rect->y2 = min_t(unsigned int, round_up(rect->y2, SSD130X_PAGE_HEIGHT), ssd13xx->height);
>> +       if (ssd13xx->device_info->family_id == SSD130X_FAMILY) {
>> +               /* Align y to display page boundaries */
>> +               rect->y1 = round_down(rect->y1, SSD130X_PAGE_HEIGHT);
>> +               rect->y2 = min_t(unsigned int, round_up(rect->y2, SSD130X_PAGE_HEIGHT),
>> +                                ssd13xx->height);
>> +       }
>
> Don't you need to align to page boundaries (2 pixels per page)
> on SSD132X?
>

I guess so, yes. I'll add that to v2 as well.

> This should be handled through ssd13xx_funcs instead of a family check.
>

Agreed.

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat