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drm/tilcdc: Add atomic mode config funcs

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Add atomic mode config funcs. The atomic_commit implementation is a
copy-paste from drm_atomic_helper_commit(), leaving out the async
test. The similar copy-paste implementation appears to be used in many
other drivers too. The standard drm_atomic_helper_check() is used for
checking.

The drm_atomic_helper_check() can not be used in drm_mode_config_funcs
atomic_check() callback because the plane's check implementation may
update crtc state's ->mode_changed flag. Because of this the
drm_atomic_helper_check_modeset() has to be called once more after
drm_atomic_helper_check_planes() (see drm_atomic_helper_check_modeset()
documentation).

Signed-off-by: Jyri Sarha <jsarha@ti.com>
This commit is contained in:
Jyri Sarha 2015-12-30 17:40:24 +02:00
parent db380c58b7
commit edc4330388
1 changed files with 71 additions and 0 deletions
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71
drivers/gpu/drm/tilcdc/tilcdc_drv.c
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@ -20,6 +20,8 @@
#include <linux/component.h>
#include <linux/pinctrl/consumer.h>
#include <linux/suspend.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include "tilcdc_drv.h"
#include "tilcdc_regs.h"
@ -59,9 +61,78 @@ static void tilcdc_fb_output_poll_changed(struct drm_device *dev)
drm_fbdev_cma_hotplug_event(priv->fbdev);
}
int tilcdc_atomic_check(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_helper_check_planes(dev, state);
if (ret)
return ret;
/*
* tilcdc ->atomic_check can update ->mode_changed if pixel format
* changes, hence will we check modeset changes again.
*/
ret = drm_atomic_helper_check_modeset(dev, state);
if (ret)
return ret;
return ret;
}
static int tilcdc_commit(struct drm_device *dev,
struct drm_atomic_state *state,
bool async)
{
int ret;
ret = drm_atomic_helper_prepare_planes(dev, state);
if (ret)
return ret;
drm_atomic_helper_swap_state(state, true);
/*
* Everything below can be run asynchronously without the need to grab
* any modeset locks at all under one condition: It must be guaranteed
* that the asynchronous work has either been cancelled (if the driver
* supports it, which at least requires that the framebuffers get
* cleaned up with drm_atomic_helper_cleanup_planes()) or completed
* before the new state gets committed on the software side with
* drm_atomic_helper_swap_state().
*
* This scheme allows new atomic state updates to be prepared and
* checked in parallel to the asynchronous completion of the previous
* update. Which is important since compositors need to figure out the
* composition of the next frame right after having submitted the
* current layout.
*/
drm_atomic_helper_commit_modeset_disables(dev, state);
drm_atomic_helper_commit_planes(dev, state, false);
drm_atomic_helper_commit_modeset_enables(dev, state);
drm_atomic_helper_wait_for_vblanks(dev, state);
drm_atomic_helper_cleanup_planes(dev, state);
drm_atomic_state_free(state);
return 0;
}
static const struct drm_mode_config_funcs mode_config_funcs = {
.fb_create = tilcdc_fb_create,
.output_poll_changed = tilcdc_fb_output_poll_changed,
.atomic_check = tilcdc_atomic_check,
.atomic_commit = tilcdc_commit,
};
static int modeset_init(struct drm_device *dev)