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SubjectRe: [PATCH v3] drm/bochs: add edid present check
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>

> ---
> 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
>

--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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