[PATCH] drm: Don't force all planes to be added to the state due to zpos
Sean Paul
seanpaul at chromium.org
Tue Oct 25 20:53:18 UTC 2016
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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