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Subject[PATCH v4 10/11] drm/rockchip: Don't fully disable vop on self refresh
Date
From: Sean Paul <seanpaul@chromium.org>

Instead of fully disabling and re-enabling the vop on self refresh
transitions, only disable the active windows. This will speed up
self refresh exits substantially and is still a power-savings win.

This patch integrates portions of Zain's patch from here:
https://patchwork.kernel.org/patch/9615063/

Changes in v2:
- None
Changes in v3:
- None
Changes in v4:
- Adjust for preceding vop_win_disable changes

Link to v1: https://patchwork.freedesktop.org/patch/msgid/20190228210939.83386-5-sean@poorly.run
Link to v2: https://patchwork.freedesktop.org/patch/msgid/20190326204509.96515-4-sean@poorly.run
Link to v3: https://patchwork.freedesktop.org/patch/msgid/20190502194956.218441-10-sean@poorly.run

Cc: Zain Wang <wzz@rock-chips.com>
Cc: Tomasz Figa <tfiga@chromium.org>
Cc: Kristian H. Kristensen <hoegsberg@chromium.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
---
drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 41 ++++++++++++++++++---
1 file changed, 36 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index 15a5b44eb7e7..acdc86a9144b 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -134,6 +134,7 @@ struct vop {
bool is_enabled;

struct completion dsp_hold_completion;
+ unsigned int win_enabled;

/* protected by dev->event_lock */
struct drm_pending_vblank_event *event;
@@ -555,6 +556,7 @@ static void vop_win_disable(struct vop *vop, const struct vop_win *vop_win)
}

VOP_WIN_SET(vop, win, enable, 0);
+ vop->win_enabled &= ~BIT(VOP_WIN_TO_INDEX(vop_win));
}

static int vop_enable(struct drm_crtc *crtc, struct drm_crtc_state *old_state)
@@ -637,6 +639,25 @@ static int vop_enable(struct drm_crtc *crtc, struct drm_crtc_state *old_state)
return ret;
}

+static void rockchip_drm_set_win_enabled(struct drm_crtc *crtc, bool enabled)
+{
+ struct vop *vop = to_vop(crtc);
+ int i;
+
+ spin_lock(&vop->reg_lock);
+
+ for (i = 0; i < vop->data->win_size; i++) {
+ struct vop_win *vop_win = &vop->win[i];
+ const struct vop_win_data *win = vop_win->data;
+
+ VOP_WIN_SET(vop, win, enable,
+ enabled && (vop->win_enabled & BIT(i)));
+ }
+ vop_cfg_done(vop);
+
+ spin_unlock(&vop->reg_lock);
+}
+
static void vop_crtc_atomic_disable(struct drm_crtc *crtc,
struct drm_crtc_state *old_state)
{
@@ -644,15 +665,16 @@ static void vop_crtc_atomic_disable(struct drm_crtc *crtc,

WARN_ON(vop->event);

- mutex_lock(&vop->vop_lock);
+ if (crtc->state->self_refresh_active)
+ rockchip_drm_set_win_enabled(crtc, false);

- if (!vop->is_enabled) {
- mutex_unlock(&vop->vop_lock);
- return;
- }
+ mutex_lock(&vop->vop_lock);

drm_crtc_vblank_off(crtc);

+ if (crtc->state->self_refresh_active)
+ goto out;
+
/*
* Vop standby will take effect at end of current frame,
* if dsp hold valid irq happen, it means standby complete.
@@ -683,6 +705,8 @@ static void vop_crtc_atomic_disable(struct drm_crtc *crtc,
clk_disable(vop->dclk);
vop_core_clks_disable(vop);
pm_runtime_put(vop->dev);
+
+out:
mutex_unlock(&vop->vop_lock);

if (crtc->state->event && !crtc->state->active) {
@@ -900,6 +924,7 @@ static void vop_plane_atomic_update(struct drm_plane *plane,
}

VOP_WIN_SET(vop, win, enable, 1);
+ vop->win_enabled |= BIT(win_index);
spin_unlock(&vop->reg_lock);
}

@@ -1056,6 +1081,12 @@ static void vop_crtc_atomic_enable(struct drm_crtc *crtc,
int dither_bpc = s->output_bpc ? s->output_bpc : 10;
int ret;

+ if (old_state && old_state->self_refresh_active) {
+ drm_crtc_vblank_on(crtc);
+ rockchip_drm_set_win_enabled(crtc, true);
+ return;
+ }
+
mutex_lock(&vop->vop_lock);

WARN_ON(vop->event);
--
Sean Paul, Software Engineer, Google / Chromium OS
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