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drm/atmel-hlcdc: Fix suspend/resume implementation

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The current suspend resume implementation is assuming register values are
kept when entering suspend, which is no longer the case with the
suspend-to-RAM on the sama5d2.

While at it, switch to the generic infrastructure to enter suspend mode
(drm_atomic_helper_suspend/resume()).

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Tested-by: Sylvain Rochet <sylvain.rochet@finsecur.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1488371461-22243-1-git-send-email-boris.brezillon@free-electrons.com
This commit is contained in:
Boris Brezillon 2017-03-01 13:31:01 +01:00
parent 82c8e025b5
commit 99ed4d7eb2
3 changed files with 21 additions and 51 deletions
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33
drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
View File

@ -55,14 +55,12 @@ drm_crtc_state_to_atmel_hlcdc_crtc_state(struct drm_crtc_state *state)
* @hlcdc: pointer to the atmel_hlcdc structure provided by the MFD device
* @event: pointer to the current page flip event
* @id: CRTC id (returned by drm_crtc_index)
* @enabled: CRTC state
*/
struct atmel_hlcdc_crtc {
struct drm_crtc base;
struct atmel_hlcdc_dc *dc;
struct drm_pending_vblank_event *event;
int id;
bool enabled;
};
static inline struct atmel_hlcdc_crtc *
@ -158,9 +156,6 @@ static void atmel_hlcdc_crtc_disable(struct drm_crtc *c)
struct regmap *regmap = crtc->dc->hlcdc->regmap;
unsigned int status;
if (!crtc->enabled)
return;
drm_crtc_vblank_off(c);
pm_runtime_get_sync(dev->dev);
@ -186,8 +181,6 @@ static void atmel_hlcdc_crtc_disable(struct drm_crtc *c)
pm_runtime_allow(dev->dev);
pm_runtime_put_sync(dev->dev);
crtc->enabled = false;
}
static void atmel_hlcdc_crtc_enable(struct drm_crtc *c)
@ -197,9 +190,6 @@ static void atmel_hlcdc_crtc_enable(struct drm_crtc *c)
struct regmap *regmap = crtc->dc->hlcdc->regmap;
unsigned int status;
if (crtc->enabled)
return;
pm_runtime_get_sync(dev->dev);
pm_runtime_forbid(dev->dev);
@ -226,29 +216,6 @@ static void atmel_hlcdc_crtc_enable(struct drm_crtc *c)
pm_runtime_put_sync(dev->dev);
drm_crtc_vblank_on(c);
crtc->enabled = true;
}
void atmel_hlcdc_crtc_suspend(struct drm_crtc *c)
{
struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
if (crtc->enabled) {
atmel_hlcdc_crtc_disable(c);
/* save enable state for resume */
crtc->enabled = true;
}
}
void atmel_hlcdc_crtc_resume(struct drm_crtc *c)
{
struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
if (crtc->enabled) {
crtc->enabled = false;
atmel_hlcdc_crtc_enable(c);
}
}
#define ATMEL_HLCDC_RGB444_OUTPUT BIT(0)

31
drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
View File

@ -800,31 +800,32 @@ static int atmel_hlcdc_dc_drm_remove(struct platform_device *pdev)
static int atmel_hlcdc_dc_drm_suspend(struct device *dev)
{
struct drm_device *drm_dev = dev_get_drvdata(dev);
struct drm_crtc *crtc;
struct atmel_hlcdc_dc *dc = drm_dev->dev_private;
struct regmap *regmap = dc->hlcdc->regmap;
struct drm_atomic_state *state;
if (pm_runtime_suspended(dev))
return 0;
state = drm_atomic_helper_suspend(drm_dev);
if (IS_ERR(state))
return PTR_ERR(state);
dc->suspend.state = state;
regmap_read(regmap, ATMEL_HLCDC_IMR, &dc->suspend.imr);
regmap_write(regmap, ATMEL_HLCDC_IDR, dc->suspend.imr);
clk_disable_unprepare(dc->hlcdc->periph_clk);
drm_modeset_lock_all(drm_dev);
list_for_each_entry(crtc, &drm_dev->mode_config.crtc_list, head)
atmel_hlcdc_crtc_suspend(crtc);
drm_modeset_unlock_all(drm_dev);
return 0;
}
static int atmel_hlcdc_dc_drm_resume(struct device *dev)
{
struct drm_device *drm_dev = dev_get_drvdata(dev);
struct drm_crtc *crtc;
struct atmel_hlcdc_dc *dc = drm_dev->dev_private;
if (pm_runtime_suspended(dev))
return 0;
clk_prepare_enable(dc->hlcdc->periph_clk);
regmap_write(dc->hlcdc->regmap, ATMEL_HLCDC_IER, dc->suspend.imr);
drm_modeset_lock_all(drm_dev);
list_for_each_entry(crtc, &drm_dev->mode_config.crtc_list, head)
atmel_hlcdc_crtc_resume(crtc);
drm_modeset_unlock_all(drm_dev);
return 0;
return drm_atomic_helper_resume(drm_dev, dc->suspend.state);
}
#endif

8
drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
View File

@ -358,6 +358,7 @@ struct atmel_hlcdc_plane_properties {
* @planes: instantiated planes
* @layers: active HLCDC layers
* @wq: display controller workqueue
* @suspend: used to store the HLCDC state when entering suspend
* @commit: used for async commit handling
*/
struct atmel_hlcdc_dc {
@ -368,6 +369,10 @@ struct atmel_hlcdc_dc {
struct drm_crtc *crtc;
struct atmel_hlcdc_layer *layers[ATMEL_HLCDC_MAX_LAYERS];
struct workqueue_struct *wq;
struct {
u32 imr;
struct drm_atomic_state *state;
} suspend;
struct {
wait_queue_head_t wait;
bool pending;
@ -428,9 +433,6 @@ int atmel_hlcdc_plane_prepare_ahb_routing(struct drm_crtc_state *c_state);
void atmel_hlcdc_crtc_irq(struct drm_crtc *c);
void atmel_hlcdc_crtc_suspend(struct drm_crtc *crtc);
void atmel_hlcdc_crtc_resume(struct drm_crtc *crtc);
int atmel_hlcdc_crtc_create(struct drm_device *dev);
int atmel_hlcdc_create_outputs(struct drm_device *dev);