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Groups > linux.kernel > #1412582
| From | Daniel Vetter <daniel@ffwll.ch> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 01/20] drm/atomic: Fix remaining places where !funcs->best_encoder is valid |
| Date | 2016-06-03 00:00 +0200 |
| Message-ID | <rFIOK-305-15@gated-at.bofh.it> (permalink) |
| References | <rFBWV-753-1@gated-at.bofh.it> <rFBWX-753-45@gated-at.bofh.it> <rFI2l-2Jx-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Thu, Jun 2, 2016 at 11:05 PM, Laurent Pinchart
<laurent.pinchart@ideasonboard.com> wrote:
> Hi Boris,
>
> Thank you for the patch.
>
> On Thursday 02 Jun 2016 16:31:28 Boris Brezillon wrote:
>> Adapt drm_pick_crtcs() and update_connector_routing() to fallback to
>> drm_atomic_helper_best_encoder() if funcs->best_encoder() is NULL so
>> that DRM drivers can leave this hook unassigned if they know they want
>> to use drm_atomic_helper_best_encoder().
>
> Could you please update include/drm/drm_modeset_helper_vtables.h to document
> this new behaviour ?
Thanks for reminding me. Please update hooks for both
atomic_best_encoder and best_encoder. Also mention that it's only
optional for atomic drivers. There's lots of examples in that file for
the wording usually used.
> The only drawback I see in this patch is the additional object lookup
> performed by drm_atomic_helper_best_encoder() at runtime. I wonder if we could
> somehow cache the information, as the assignment can't change when there's a
> 1:1 correspondence between encoders and connectors.
drm_encoder_find is an idr lookup. That should be plenty fast,
especially for modeset code. Usually what's too expensive even for
modeset code is linear list walks. But Chris just submitted patches to
convert most of them into simple lookups.
-Daniel
>>> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
>> ---
>> drivers/gpu/drm/drm_atomic_helper.c | 4 +++-
>> drivers/gpu/drm/drm_fb_helper.c | 13 ++++++++++++-
>> 2 files changed, 15 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/drm_atomic_helper.c
>> b/drivers/gpu/drm/drm_atomic_helper.c index f6a3350..849d029 100644
>> --- a/drivers/gpu/drm/drm_atomic_helper.c
>> +++ b/drivers/gpu/drm/drm_atomic_helper.c
>> @@ -300,8 +300,10 @@ update_connector_routing(struct drm_atomic_state
>> *state, if (funcs->atomic_best_encoder)
>> new_encoder = funcs->atomic_best_encoder(connector,
>> connector_state);
>> - else
>> + else if (funcs->best_encoder)
>> new_encoder = funcs->best_encoder(connector);
>> + else
>> + new_encoder = drm_atomic_helper_best_encoder(connector);
>>
>> if (!new_encoder) {
>> DRM_DEBUG_ATOMIC("No suitable encoder found for [CONNECTOR:%d:%s]\n",
>> diff --git a/drivers/gpu/drm/drm_fb_helper.c
>> b/drivers/gpu/drm/drm_fb_helper.c index 7c2eb75..d44389a 100644
>> --- a/drivers/gpu/drm/drm_fb_helper.c
>> +++ b/drivers/gpu/drm/drm_fb_helper.c
>> @@ -2000,7 +2000,18 @@ static int drm_pick_crtcs(struct drm_fb_helper
>> *fb_helper, my_score++;
>>
>> connector_funcs = connector->helper_private;
>> - encoder = connector_funcs->best_encoder(connector);
>> +
>> + /*
>> + * If the DRM device implements atomic hooks and ->best_encoder() is
>> + * NULL we fallback to the default drm_atomic_helper_best_encoder()
>> + * helper.
>> + */
>> + if (fb_helper->dev->mode_config.funcs->atomic_commit &&
>> + !connector_funcs->best_encoder)
>> + encoder = drm_atomic_helper_best_encoder(connector);
>> + else
>> + encoder = connector_funcs->best_encoder(connector);
>> +
>> if (!encoder)
>> goto out;
>
> --
> Regards,
>
> Laurent Pinchart
>
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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[PATCH 00/20] drm/atomic: Provide default ->best_encoder() behavior Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-06-02 16:40 +0200
[PATCH 18/20] drm/bridge: ptn3460: Rely on the default ->best_encoder() behavior Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-06-02 16:40 +0200
[PATCH 15/20] drm: virtgpu: Rely on the default ->best_encoder() behavior Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-06-02 16:40 +0200
[PATCH 10/20] drm: rockchip: Rely on the default ->best_encoder() behavior Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-06-02 16:40 +0200
Re: [PATCH 10/20] drm: rockchip: Rely on the default ->best_encoder() behavior Mark yao <mark.yao@rock-chips.com> - 2016-06-07 03:00 +0200
[PATCH 03/20] drm: atmel-hlcdc: Rely on the default ->best_encoder() behavior Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-06-02 16:40 +0200
[PATCH 05/20] drm: fsl-dcu: Rely on the default ->best_encoder() behavior Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-06-02 16:40 +0200
[PATCH 19/20] drm/bridge: ps8622: Rely on the default ->best_encoder() behavior Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-06-02 16:40 +0200
[PATCH 13/20] drm: tegra: Rely on the default ->best_encoder() behavior Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-06-02 16:40 +0200
[PATCH 07/20] drm: mediatek: Rely on the default ->best_encoder() behavior Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-06-02 16:40 +0200
[PATCH 17/20] drm/bridge: anx78xx: Rely on the default ->best_encoder() behavior Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-06-02 16:40 +0200
[PATCH 09/20] drm: rcar-du: Rely on the default ->best_encoder() behavior Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-06-02 16:40 +0200
Re: [PATCH 09/20] drm: rcar-du: Rely on the default ->best_encoder() behavior Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2016-06-02 23:00 +0200
Re: [PATCH 09/20] drm: rcar-du: Rely on the default ->best_encoder() behavior Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-06-03 09:40 +0200
[PATCH 14/20] drm: vc4: Rely on the default ->best_encoder() behavior Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-06-02 16:40 +0200
[PATCH 08/20] drm: msm: Rely on the default ->best_encoder() behavior where appropriate Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-06-02 16:40 +0200
[PATCH 04/20] drm: exynos: Rely on the default ->best_encoder() behavior Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-06-02 16:40 +0200
[PATCH 16/20] drm: omap: Rely on the default ->best_encoder() behavior Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-06-02 16:40 +0200
Re: [PATCH 16/20] drm: omap: Rely on the default ->best_encoder() behavior Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2016-06-02 23:10 +0200
[PATCH 12/20] drm: sun4i: Rely on the default ->best_encoder() behavior Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-06-02 16:40 +0200
[PATCH 02/20] drm: arc: Rely on the default ->best_encoder() behavior Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-06-02 16:40 +0200
[PATCH 20/20] drm/bridge: dw-hdmi: Use drm_atomic_helper_best_encoder() Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-06-02 16:40 +0200
[PATCH 06/20] drm: i915: Rely on the default ->best_encoder() behavior where appropriate Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-06-02 16:40 +0200
[PATCH 01/20] drm/atomic: Fix remaining places where !funcs->best_encoder is valid Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-06-02 16:40 +0200
Re: [PATCH 01/20] drm/atomic: Fix remaining places where !funcs->best_encoder is valid Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2016-06-02 23:10 +0200
Re: [PATCH 01/20] drm/atomic: Fix remaining places where !funcs->best_encoder is valid Daniel Vetter <daniel@ffwll.ch> - 2016-06-03 00:00 +0200
Re: [Intel-gfx] [PATCH 01/20] drm/atomic: Fix remaining places where !funcs->best_encoder is valid Chris Wilson <chris@chris-wilson.co.uk> - 2016-06-03 00:50 +0200
Re: [PATCH 01/20] drm/atomic: Fix remaining places where !funcs->best_encoder is valid Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-06-03 09:40 +0200
Re: [PATCH 01/20] drm/atomic: Fix remaining places where !funcs->best_encoder is valid Daniel Vetter <daniel@ffwll.ch> - 2016-06-03 21:10 +0200
Re: [PATCH 01/20] drm/atomic: Fix remaining places where !funcs->best_encoder is valid Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-06-03 09:40 +0200
[PATCH 11/20] drm: sti: Rely on the default ->best_encoder() behavior Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-06-02 16:40 +0200
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