On 2018년 10월 05일 15:26, Daniel Vetter wrote:
> On Fri, Oct 5, 2018 at 8:22 AM Daniel Vetter <daniel@xxxxxxxx> wrote:
>>
>> On Fri, Oct 5, 2018 at 4:59 AM Inki Dae <inki.dae@xxxxxxxxxxx> wrote:
>>>
>>> This reverts commit 0586feba322e1de05075700eb4b835c8b683e62b
>>>
>>> This patch makes it to need get_vblank_counter callback in crtc
>>> to get frame counter from decon driver.
>>>
>>> However, drm_dev->max_vblank_count is a member unique to
>>> vendor's DRM driver but in case of ARM DRM, some CRTC devices
>>> don't provide the frame counter value. As a result, this patch
>>> made extension and clone mode not working.
>>>
>>> Instead of this patch, we may need separated max_vblank_count
>>> which belongs to each CRTC device, or need to implement frame
>>> counter emulation for them who don't support HW frame counter.
>>
>> I think addin drm_crtc->max_vblank_count would make tons of sense, we've moved a bunch of the other vblank things in there too in the past. The logic in drm_vblank.c could be
>
> Oops, hit send to early. I meant:
>
> max_vblank_count = crtc->max_vblank_count ? crtc->max_vblank_count
> : dev->max_vblank_count
>
> The problem with this is that most functions in drm_vblank.c still
> only work with the (dev, pipe) pair, and not yet natively with (struct
> drm_crtc *crtc). Might be quite some refactoring needed to push the
drm_update_vblank_count function provides pipe correspoding to a crtc which is invariant over the litetime of the crtc.
So I think we could resolve this problem easily by referring to crtc->max_vblank_count given when vendor driver created a crtc after getting the crtc object using drm_crtc_from_index function.
Thanks,
Inki Dae
> crtc pointer down to all the places where we'll need it. We might also
> need to split drm_vblank.c completely into new-style functions for kms
> drivers (using struct drm_crtc *), and the legacy code for old
> ums-only drivers (still using the dev, pipe pair throughout).
> -Daniel
>
>>
>>
>> -Daniel
>>
>>>
>>> Signed-off-by: Inki Dae <inki.dae@xxxxxxxxxxx>
>>> ---
>>> drivers/gpu/drm/exynos/exynos5433_drm_decon.c | 9 ---------
>>> drivers/gpu/drm/exynos/exynos_drm_crtc.c | 11 -----------
>>> drivers/gpu/drm/exynos/exynos_drm_drv.h | 1 -
>>> 3 files changed, 21 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/exynos/exynos5433_drm_decon.c b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
>>> index 94529aa..aef487d 100644
>>> --- a/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
>>> +++ b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
>>> @@ -164,13 +164,6 @@ static u32 decon_get_frame_count(struct decon_context *ctx, bool end)
>>> return frm;
>>> }
>>>
>>> -static u32 decon_get_vblank_counter(struct exynos_drm_crtc *crtc)
>>> -{
>>> - struct decon_context *ctx = crtc->ctx;
>>> -
>>> - return decon_get_frame_count(ctx, false);
>>> -}
>>> -
>>> static void decon_setup_trigger(struct decon_context *ctx)
>>> {
>>> if (!ctx->crtc->i80_mode && !(ctx->out_type & I80_HW_TRG))
>>> @@ -536,7 +529,6 @@ static const struct exynos_drm_crtc_ops decon_crtc_ops = {
>>> .disable = decon_disable,
>>> .enable_vblank = decon_enable_vblank,
>>> .disable_vblank = decon_disable_vblank,
>>> - .get_vblank_counter = decon_get_vblank_counter,
>>> .atomic_begin = decon_atomic_begin,
>>> .update_plane = decon_update_plane,
>>> .disable_plane = decon_disable_plane,
>>> @@ -554,7 +546,6 @@ static int decon_bind(struct device *dev, struct device *master, void *data)
>>> int ret;
>>>
>>> ctx->drm_dev = drm_dev;
>>> - drm_dev->max_vblank_count = 0xffffffff;
>>>
>>> for (win = ctx->first_win; win < WINDOWS_NR; win++) {
>>> ctx->configs[win].pixel_formats = decon_formats;
>>> diff --git a/drivers/gpu/drm/exynos/exynos_drm_crtc.c b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
>>> index eea9025..2696289 100644
>>> --- a/drivers/gpu/drm/exynos/exynos_drm_crtc.c
>>> +++ b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
>>> @@ -162,16 +162,6 @@ static void exynos_drm_crtc_disable_vblank(struct drm_crtc *crtc)
>>> exynos_crtc->ops->disable_vblank(exynos_crtc);
>>> }
>>>
>>> -static u32 exynos_drm_crtc_get_vblank_counter(struct drm_crtc *crtc)
>>> -{
>>> - struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
>>> -
>>> - if (exynos_crtc->ops->get_vblank_counter)
>>> - return exynos_crtc->ops->get_vblank_counter(exynos_crtc);
>>> -
>>> - return 0;
>>> -}
>>> -
>>> static const struct drm_crtc_funcs exynos_crtc_funcs = {
>>> .set_config = drm_atomic_helper_set_config,
>>> .page_flip = drm_atomic_helper_page_flip,
>>> @@ -181,7 +171,6 @@ static const struct drm_crtc_funcs exynos_crtc_funcs = {
>>> .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
>>> .enable_vblank = exynos_drm_crtc_enable_vblank,
>>> .disable_vblank = exynos_drm_crtc_disable_vblank,
>>> - .get_vblank_counter = exynos_drm_crtc_get_vblank_counter,
>>> };
>>>
>>> struct exynos_drm_crtc *exynos_drm_crtc_create(struct drm_device *drm_dev,
>>> diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h
>>> index ec9604f..5e61e70 100644
>>> --- a/drivers/gpu/drm/exynos/exynos_drm_drv.h
>>> +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h
>>> @@ -135,7 +135,6 @@ struct exynos_drm_crtc_ops {
>>> void (*disable)(struct exynos_drm_crtc *crtc);
>>> int (*enable_vblank)(struct exynos_drm_crtc *crtc);
>>> void (*disable_vblank)(struct exynos_drm_crtc *crtc);
>>> - u32 (*get_vblank_counter)(struct exynos_drm_crtc *crtc);
>>> enum drm_mode_status (*mode_valid)(struct exynos_drm_crtc *crtc,
>>> const struct drm_display_mode *mode);
>>> bool (*mode_fixup)(struct exynos_drm_crtc *crtc,
>>> --
>>> 2.7.4
>>>
>>> _______________________________________________
>>> dri-devel mailing list
>>> dri-devel@xxxxxxxxxxxxxxxxxxxxx
>>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
>>
>>
>>
>> --
>> Daniel Vetter
>> Software Engineer, Intel Corporation
>> +41 (0) 79 365 57 48 - http://blog.ffwll.ch
>
>
>
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