linux-kernel - Re: [PATCH 4/5] drm: ssd130x: Reduce temporary buffer sizes

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Date:   Tue, 15 Mar 2022 13:32:44 +0100
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Noralf Trønnes <noralf@...nnes.org>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] drm: ssd130x: Reduce temporary buffer sizes

On 3/15/22 12:07, Geert Uytterhoeven wrote:
> ssd130x_clear_screen() allocates a temporary buffer sized to hold one
> byte per pixel, while it only needs to hold one bit per pixel.
> 
> ssd130x_fb_blit_rect() allocates a temporary buffer sized to hold one
> byte per pixel for the whole frame buffer, while it only needs to hold
> one bit per pixel for the part that is to be updated.
> Pass dst_pitch to drm_fb_xrgb8888_to_mono_reversed(), as we have already

Just drm_fb_xrgb8888_to_mono() since you already fixed the name in patch 1/5.

> calculated it anyway.
> 
> Fixes: a61732e808672cfa ("drm: Add driver for Solomon SSD130x OLED displays")
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> ---

Indeed. I haven't noticed that got the calculation wrong until you pointed out.

Acked-by: Javier Martinez Canillas <javierm@...hat.com>

-- 
Best regards,

Javier Martinez Canillas
Linux Engineering
Red Hat