[PATCH] drm: Don't force all planes to be added to the state due to zpos
Benjamin Gaignard
benjamin.gaignard at linaro.org
Wed Oct 26 14:09:00 UTC 2016
I have just tested it on my board, no regression :-)
Acked-by: Benjamin Gaignard <benjamin.gaignard at linaro.org>
2016-10-25 22:53 GMT+02:00 Sean Paul <seanpaul at chromium.org>:
> On Tue, Oct 25, 2016 at 10:43 AM, Ville Syrjälä
> <ville.syrjala at linux.intel.com> wrote:
>> On Mon, Oct 10, 2016 at 03:19:47PM +0300, ville.syrjala at linux.intel.com wrote:
>>> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>>>
>>> We don't want all planes to be added to the state whenever a
>>> plane with fixed zpos gets enabled/disabled. This is true
>>> especially for eg. cursor planes on i915, as we want cursor
>>> updates to go through w/o throttling. Same holds for drivers
>>> that don't support zpos at all (i915 actually falls into this
>>> category right now since we've not yet added zpos support).
>>>
>>> Allow drivers more freedom by letting them deal with zpos
>>> themselves instead of doing it in drm_atomic_helper_check_planes()
>>> unconditionally. Easiest solution seems to be to move the call
>>> up to drm_atomic_helper_check(). But as some drivers might want
>>> to use that function without the zpos handling, let's provide
>>> two variants: the normal one, and one that deals with zpos.
>>>
>>> Cc: Marek Szyprowski <m.szyprowski at samsung.com>
>>> Cc: Benjamin Gaignard <benjamin.gaignard at linaro.org>
>>> Cc: Vincent Abriou <vincent.abriou at st.com>
>>> Cc: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
>>> Cc: Inki Dae <inki.dae at samsung.com>
>>> Cc: Joonyoung Shim <jy0922.shim at samsung.com>
>>> Cc: Seung-Woo Kim <sw0312.kim at samsung.com>
>>> Cc: Kyungmin Park <kyungmin.park at samsung.com>
>>> Cc: Lyude <cpaul at redhat.com>
>>> Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
>>> Cc: stable at vger.kernel.org
>>> Fixes: 44d1240d006c ("drm: add generic zpos property")
>>> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
>>
>> Ping. Can I get some buy-in from the relevant folks?
>>
>
> Reviewed-by: Sean Paul <seanpaul at chromium.org>
>
> FWIW :)
>
>>> ---
>>> drivers/gpu/drm/drm_atomic_helper.c | 46 +++++++++++++++++++++++++++++++---
>>> drivers/gpu/drm/exynos/exynos_drm_fb.c | 2 +-
>>> drivers/gpu/drm/rcar-du/rcar_du_kms.c | 2 +-
>>> drivers/gpu/drm/sti/sti_drv.c | 2 +-
>>> include/drm/drm_atomic_helper.h | 2 ++
>>> 5 files changed, 47 insertions(+), 7 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
>>> index c3f83476f996..cd19281cdefb 100644
>>> --- a/drivers/gpu/drm/drm_atomic_helper.c
>>> +++ b/drivers/gpu/drm/drm_atomic_helper.c
>>> @@ -594,10 +594,6 @@ drm_atomic_helper_check_planes(struct drm_device *dev,
>>> struct drm_plane_state *plane_state;
>>> int i, ret = 0;
>>>
>>> - ret = drm_atomic_normalize_zpos(dev, state);
>>> - if (ret)
>>> - return ret;
>>> -
>>> for_each_plane_in_state(state, plane, plane_state, i) {
>>> const struct drm_plane_helper_funcs *funcs;
>>>
>>> @@ -673,6 +669,48 @@ int drm_atomic_helper_check(struct drm_device *dev,
>>> }
>>> EXPORT_SYMBOL(drm_atomic_helper_check);
>>>
>>> +/**
>>> + * drm_atomic_helper_check_with_zpos - validate state object, dealing with zpos
>>> + * @dev: DRM device
>>> + * @state: the driver state object
>>> + *
>>> + * Check the state object to see if the requested state is physically possible.
>>> + * Only crtcs and planes have check callbacks, so for any additional (global)
>>> + * checking that a driver needs it can simply wrap that around this function.
>>> + * Drivers without such needs can directly use this as their ->atomic_check()
>>> + * callback.
>>> + *
>>> + * This just wraps the two parts of the state checking for planes and modeset
>>> + * state in the default order: First it calls drm_atomic_helper_check_modeset(),
>>> + * followed by drm_atomic_normalize_zpos(), and finally
>>> + * drm_atomic_helper_check_planes(). The assumption is that the
>>> + * ->atomic_check functions depend upon an updated adjusted_mode.clock to
>>> + * e.g. properly compute watermarks.
>>> + *
>>> + * RETURNS:
>>> + * Zero for success or -errno
>>> + */
>>> +int drm_atomic_helper_check_with_zpos(struct drm_device *dev,
>>> + struct drm_atomic_state *state)
>>> +{
>>> + int ret;
>>> +
>>> + ret = drm_atomic_helper_check_modeset(dev, state);
>>> + if (ret)
>>> + return ret;
>>> +
>>> + ret = drm_atomic_normalize_zpos(dev, state);
>>> + if (ret)
>>> + return ret;
>>> +
>>> + ret = drm_atomic_helper_check_planes(dev, state);
>>> + if (ret)
>>> + return ret;
>>> +
>>> + return ret;
>>> +}
>>> +EXPORT_SYMBOL(drm_atomic_helper_check_with_zpos);
>>> +
>>> static void
>>> disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
>>> {
>>> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fb.c b/drivers/gpu/drm/exynos/exynos_drm_fb.c
>>> index 40ce841eb952..5c0930af01fa 100644
>>> --- a/drivers/gpu/drm/exynos/exynos_drm_fb.c
>>> +++ b/drivers/gpu/drm/exynos/exynos_drm_fb.c
>>> @@ -190,7 +190,7 @@ dma_addr_t exynos_drm_fb_dma_addr(struct drm_framebuffer *fb, int index)
>>> static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
>>> .fb_create = exynos_user_fb_create,
>>> .output_poll_changed = exynos_drm_output_poll_changed,
>>> - .atomic_check = drm_atomic_helper_check,
>>> + .atomic_check = drm_atomic_helper_check_with_zpos,
>>> .atomic_commit = exynos_atomic_commit,
>>> };
>>>
>>> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
>>> index bd9c3bb9252c..2cfd35f3f2f6 100644
>>> --- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c
>>> +++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
>>> @@ -231,7 +231,7 @@ static int rcar_du_atomic_check(struct drm_device *dev,
>>> struct rcar_du_device *rcdu = dev->dev_private;
>>> int ret;
>>>
>>> - ret = drm_atomic_helper_check(dev, state);
>>> + ret = drm_atomic_helper_check_with_zpos(dev, state);
>>> if (ret < 0)
>>> return ret;
>>>
>>> diff --git a/drivers/gpu/drm/sti/sti_drv.c b/drivers/gpu/drm/sti/sti_drv.c
>>> index 2784919a7366..df5f150021d0 100644
>>> --- a/drivers/gpu/drm/sti/sti_drv.c
>>> +++ b/drivers/gpu/drm/sti/sti_drv.c
>>> @@ -248,7 +248,7 @@ static void sti_output_poll_changed(struct drm_device *ddev)
>>> static const struct drm_mode_config_funcs sti_mode_config_funcs = {
>>> .fb_create = drm_fb_cma_create,
>>> .output_poll_changed = sti_output_poll_changed,
>>> - .atomic_check = drm_atomic_helper_check,
>>> + .atomic_check = drm_atomic_helper_check_with_zpos,
>>> .atomic_commit = sti_atomic_commit,
>>> };
>>>
>>> diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
>>> index 7ff92b09fd9c..b1e7193c9d1c 100644
>>> --- a/include/drm/drm_atomic_helper.h
>>> +++ b/include/drm/drm_atomic_helper.h
>>> @@ -40,6 +40,8 @@ int drm_atomic_helper_check_planes(struct drm_device *dev,
>>> struct drm_atomic_state *state);
>>> int drm_atomic_helper_check(struct drm_device *dev,
>>> struct drm_atomic_state *state);
>>> +int drm_atomic_helper_check_with_zpos(struct drm_device *dev,
>>> + struct drm_atomic_state *state);
>>> void drm_atomic_helper_commit_tail(struct drm_atomic_state *state);
>>> int drm_atomic_helper_commit(struct drm_device *dev,
>>> struct drm_atomic_state *state,
>>> --
>>> 2.7.4
>>
>> --
>> Ville Syrjälä
>> Intel OTC
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--
Benjamin Gaignard
Graphic Study Group
Linaro.org │ Open source software for ARM SoCs
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