linux-kernel - Re: [PATCH v3 3/3] drm/tiny: ili9486: remove conflicting framebuffers

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Message-ID: <c460bbda-6e9d-24e8-eb73-2e7207958deb@suse.de>
Date:   Tue, 6 Dec 2022 10:52:29 +0100
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     neil.armstrong@...aro.org, Carlo Caione <ccaione@...libre.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Jerome Brunet <jbrunet@...libre.com>,
        David Airlie <airlied@...il.com>,
        Kamlesh Gurudasani <kamlesh.gurudasani@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Kevin Hilman <khilman@...libre.com>
Cc:     linux-amlogic@...ts.infradead.org, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] drm/tiny: ili9486: remove conflicting framebuffers

Hi

Am 06.12.22 um 10:41 schrieb Neil Armstrong:
> Hi Carlo,
> 
> On 06/12/2022 09:34, Carlo Caione wrote:
>> For platforms using simplefb / efifb, call
>> drm_aperture_remove_framebuffers() to remove the conflicting
>> framebuffer.
> 
> Conflicting framebuffer on the SPI display ? How is that possible ?

Calling drm_aperture_remove_framebuffers() is only required if the 
graphics card may have been pre-initialized by the system, such as a 
VGA-compatible card on a PC.

Could the SPI display have been initialized by the firmware? If not, the 
call should be left out.

Best regards
Thomas

> 
> The meson_drm should already do this, no ?
> 
> Neil
> 
>>
>> Signed-off-by: Carlo Caione <ccaione@...libre.com>
>> ---
>>   drivers/gpu/drm/tiny/ili9486.c | 5 +++++
>>   1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/tiny/ili9486.c 
>> b/drivers/gpu/drm/tiny/ili9486.c
>> index 14a9e6ad2d15..6fd4d42437fd 100644
>> --- a/drivers/gpu/drm/tiny/ili9486.c
>> +++ b/drivers/gpu/drm/tiny/ili9486.c
>> @@ -14,6 +14,7 @@
>>   #include <video/mipi_display.h>
>> +#include <drm/drm_aperture.h>
>>   #include <drm/drm_atomic_helper.h>
>>   #include <drm/drm_drv.h>
>>   #include <drm/drm_fb_helper.h>
>> @@ -238,6 +239,10 @@ static int ili9486_probe(struct spi_device *spi)
>>       if (ret)
>>           return ret;
>> +    ret = drm_aperture_remove_framebuffers(false, &ili9486_driver);
>> +    if (ret)
>> +        return ret;
>> +
>>       drm_mode_config_reset(drm);
>>       ret = drm_dev_register(drm, 0);
>>
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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