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Subject[PATCH v2 2/6] drm: rcar-du: Add CRTC standby helpers
Date
Provide helpers to manage the power state, and initial configuration of
the CRTC.

rcar_du_crtc_get() and rcar_du_crtc_get() are no longer used, and are
removed, simplifying the implementation and removing the initialized
flag which was needed to track the state of the CRTC.

Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

---
v2:
- Registers sequence confirmed unchanged
- re-ordered in the series to handle before groups.
- Do not merge rcar_du_crtc_setup(). (now handled by _crtc_pre_commit)

drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 69 +++++++++++++++-----------
drivers/gpu/drm/rcar-du/rcar_du_crtc.h | 7 ++-
drivers/gpu/drm/rcar-du/rcar_du_kms.c | 4 ++
3 files changed, 49 insertions(+), 31 deletions(-)

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
index 471ce464654a..6109a97b0bb9 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
@@ -499,17 +499,10 @@ static void rcar_du_crtc_setup(struct rcar_du_crtc *rcrtc)
drm_crtc_vblank_on(&rcrtc->crtc);
}

-static int rcar_du_crtc_get(struct rcar_du_crtc *rcrtc)
+static int rcar_du_crtc_enable(struct rcar_du_crtc *rcrtc)
{
int ret;

- /*
- * Guard against double-get, as the function is called from both the
- * .atomic_enable() and .atomic_begin() handlers.
- */
- if (rcrtc->initialized)
- return 0;
-
ret = clk_prepare_enable(rcrtc->clock);
if (ret < 0)
return ret;
@@ -523,7 +516,6 @@ static int rcar_du_crtc_get(struct rcar_du_crtc *rcrtc)
goto error_group;

rcar_du_crtc_setup(rcrtc);
- rcrtc->initialized = true;

return 0;

@@ -534,14 +526,12 @@ static int rcar_du_crtc_get(struct rcar_du_crtc *rcrtc)
return ret;
}

-static void rcar_du_crtc_put(struct rcar_du_crtc *rcrtc)
+static void rcar_du_crtc_disable(struct rcar_du_crtc *rcrtc)
{
rcar_du_group_put(rcrtc->group);

clk_disable_unprepare(rcrtc->extclock);
clk_disable_unprepare(rcrtc->clock);
-
- rcrtc->initialized = false;
}

static void rcar_du_crtc_start(struct rcar_du_crtc *rcrtc)
@@ -655,6 +645,44 @@ static int rcar_du_crtc_atomic_check(struct drm_crtc *crtc,
return 0;
}

+int rcar_du_crtc_atomic_exit_standby(struct drm_device *dev,
+ struct drm_atomic_state *state)
+{
+ struct drm_crtc *crtc;
+ struct drm_crtc_state *crtc_state;
+ unsigned int i;
+
+ for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
+ struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
+
+ if (crtc_state->active_changed && crtc_state->active) {
+ int ret = rcar_du_crtc_enable(rcrtc);
+
+ if (ret)
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+int rcar_du_crtc_atomic_enter_standby(struct drm_device *dev,
+ struct drm_atomic_state *state)
+{
+ struct drm_crtc *crtc;
+ struct drm_crtc_state *crtc_state;
+ unsigned int i;
+
+ for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
+ struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
+
+ if (crtc_state->active_changed && !crtc_state->active)
+ rcar_du_crtc_disable(rcrtc);
+ }
+
+ return 0;
+}
+
static void rcar_du_crtc_atomic_enable(struct drm_crtc *crtc,
struct drm_crtc_state *old_state)
{
@@ -662,8 +690,6 @@ static void rcar_du_crtc_atomic_enable(struct drm_crtc *crtc,
struct rcar_du_crtc_state *rstate = to_rcar_crtc_state(crtc->state);
struct rcar_du_device *rcdu = rcrtc->dev;

- rcar_du_crtc_get(rcrtc);
-
/*
* On D3/E3 the dot clock is provided by the LVDS encoder attached to
* the DU channel. We need to enable its clock output explicitly if
@@ -691,7 +717,6 @@ static void rcar_du_crtc_atomic_disable(struct drm_crtc *crtc,
struct rcar_du_device *rcdu = rcrtc->dev;

rcar_du_crtc_stop(rcrtc);
- rcar_du_crtc_put(rcrtc);

if (rcdu->info->lvds_clk_mask & BIT(rcrtc->index) &&
rstate->outputs == BIT(RCAR_DU_OUTPUT_DPAD0)) {
@@ -720,20 +745,6 @@ static void rcar_du_crtc_atomic_begin(struct drm_crtc *crtc,

WARN_ON(!crtc->state->enable);

- /*
- * If a mode set is in progress we can be called with the CRTC disabled.
- * We thus need to first get and setup the CRTC in order to configure
- * planes. We must *not* put the CRTC in .atomic_flush(), as it must be
- * kept awake until the .atomic_enable() call that will follow. The get
- * operation in .atomic_enable() will in that case be a no-op, and the
- * CRTC will be put later in .atomic_disable().
- *
- * If a mode set is not in progress the CRTC is enabled, and the
- * following get call will be a no-op. There is thus no need to balance
- * it in .atomic_flush() either.
- */
- rcar_du_crtc_get(rcrtc);
-
if (rcar_du_has(rcrtc->dev, RCAR_DU_FEATURE_VSP1_SOURCE))
rcar_du_vsp_atomic_begin(rcrtc);
}
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.h b/drivers/gpu/drm/rcar-du/rcar_du_crtc.h
index 11814eafef77..d12d4a788e9f 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.h
@@ -29,7 +29,6 @@ struct rcar_du_vsp;
* @extclock: external pixel dot clock (optional)
* @mmio_offset: offset of the CRTC registers in the DU MMIO block
* @index: CRTC software and hardware index
- * @initialized: whether the CRTC has been initialized and clocks enabled
* @dsysr: cached value of the DSYSR register
* @vblank_enable: whether vblank events are enabled on this CRTC
* @event: event to post when the pending page flip completes
@@ -49,7 +48,6 @@ struct rcar_du_crtc {
struct clk *extclock;
unsigned int mmio_offset;
unsigned int index;
- bool initialized;

u32 dsysr;

@@ -102,6 +100,11 @@ int rcar_du_crtc_create(struct rcar_du_group *rgrp, unsigned int swindex,

void rcar_du_crtc_finish_page_flip(struct rcar_du_crtc *rcrtc);

+int rcar_du_crtc_atomic_exit_standby(struct drm_device *dev,
+ struct drm_atomic_state *state);
+int rcar_du_crtc_atomic_enter_standby(struct drm_device *dev,
+ struct drm_atomic_state *state);
+
void rcar_du_crtc_dsysr_clr_set(struct rcar_du_crtc *rcrtc, u32 clr, u32 set);

#endif /* __RCAR_DU_CRTC_H__ */
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
index 3b7d50a8fb9b..b8da4dfc79d2 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
@@ -303,11 +303,15 @@ static void rcar_du_atomic_commit_tail(struct drm_atomic_state *old_state)
}

/* Apply the atomic update. */
+ rcar_du_crtc_atomic_exit_standby(dev, old_state);
+
drm_atomic_helper_commit_modeset_disables(dev, old_state);
drm_atomic_helper_commit_planes(dev, old_state,
DRM_PLANE_COMMIT_ACTIVE_ONLY);
drm_atomic_helper_commit_modeset_enables(dev, old_state);

+ rcar_du_crtc_atomic_enter_standby(dev, old_state);
+
drm_atomic_helper_commit_hw_done(old_state);
drm_atomic_helper_wait_for_flip_done(dev, old_state);

--
2.19.1
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