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Subject: Re: [PATCH v3] drm/bochs: add edid present check
To:     Gerd Hoffmann <kraxel@redhat.com>, dri-devel@lists.freedesktop.org,
        David Airlie <airlied@linux.ie>,
        "open list:DRM DRIVER FOR BOCHS VIRTUAL GPU" 
        <virtualization@lists.linux-foundation.org>,
        open list <linux-kernel@vger.kernel.org>
References: <20181220101122.16153-1-kraxel@redhat.com>
 <20181220105104.GI21184@phenom.ffwll.local>
From:   Oleksandr Andrushchenko <andr2000@gmail.com>
Message-ID: <57c74dd5-4ea6-8bc7-8e83-55b27976e8e5@gmail.com>
Date:   Thu, 20 Dec 2018 13:26:44 +0200
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On 12/20/18 12:51 PM, Daniel Vetter wrote:
> On Thu, Dec 20, 2018 at 11:11:21AM +0100, Gerd Hoffmann wrote:
>> Check header before trying to read the complete edid blob, to avoid the
>> log being spammed in case qemu has no edid support (old qemu or edid
>> support turned off).
>>
>> Fixes: 01f23459cf drm/bochs: add edid support.
>> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
>
>> ---
>>   drivers/gpu/drm/bochs/bochs_hw.c | 7 +++++++
>>   1 file changed, 7 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/bochs/bochs_hw.c b/drivers/gpu/drm/bochs/bochs_hw.c
>> index c90a0d492f..d0b4e1cee8 100644
>> --- a/drivers/gpu/drm/bochs/bochs_hw.c
>> +++ b/drivers/gpu/drm/bochs/bochs_hw.c
>> @@ -86,9 +86,16 @@ static int bochs_get_edid_block(void *data, u8 *buf,
>>   
>>   int bochs_hw_load_edid(struct bochs_device *bochs)
>>   {
>> +	u8 header[8];
>> +
>>   	if (!bochs->mmio)
>>   		return -1;
>>   
>> +	/* check header to detect whenever edid support is enabled in qemu */
>> +	bochs_get_edid_block(bochs, header, 0, ARRAY_SIZE(header));
>> +	if (drm_edid_header_is_valid(header) != 8)
>> +		return -1;
>> +
>>   	kfree(bochs->edid);
>>   	bochs->edid = drm_do_get_edid(&bochs->connector,
>>   				      bochs_get_edid_block, bochs);
>> -- 
>> 2.9.3
>>