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SubjectRe: [RFC PATCH 02/11] drm/fb-helper: Skip writeback connectors
On Tue, Oct 11, 2016 at 05:44:48PM +0200, Daniel Vetter wrote:
>On Tue, Oct 11, 2016 at 03:53:59PM +0100, Brian Starkey wrote:
>> Writeback connectors aren't much use to the fbdev helpers, as they won't
>> show anything to the user. Skip them when looking for candidate output
>> configurations.
>>
>> Signed-off-by: Brian Starkey <brian.starkey@arm.com>
>> ---
>> drivers/gpu/drm/drm_fb_helper.c | 4 ++++
>> 1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
>> index 03414bd..dedf6e7 100644
>> --- a/drivers/gpu/drm/drm_fb_helper.c
>> +++ b/drivers/gpu/drm/drm_fb_helper.c
>> @@ -2016,6 +2016,10 @@ static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
>> if (modes[n] == NULL)
>> return best_score;
>>
>> + /* Writeback connectors aren't much use for fbdev */
>> + if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
>> + return best_score;
>
>I think we could handle this by always marking writeback connectors as
>disconnected. Userspace and fbdev emulation should then avoid them,
>always.
>-Daniel
>

Good idea; I'll need to take a closer look at how it would interact
with the probe helper (connector->force etc).

Are you thinking instead-of or in-addition-to the client cap? I'd be
worried about apps doing strange things and trying to use even
disconnected connectors.

>> +
>> crtcs = kzalloc(fb_helper->connector_count *
>> sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
>> if (!crtcs)
>> --
>> 1.7.9.5
>>
>
>--
>Daniel Vetter
>Software Engineer, Intel Corporation
>http://blog.ffwll.ch
>

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