[PATCH v2 1/2] drm/rockchip: vop use is_enabled instead of dpms mode

From: Mark Yao
Date: Thu Jan 22 2015 - 05:31:14 EST


drm dpms have many power modes: ON,OFF,SUSPEND,STANDBY, etc.
but vop only have enable/disable mode, maybe case such bug:
--> DRM_DPMS_ON: power on vop
--> DRM_DPMS_SUSPEND: power off vop
--> DRM_DPMS_OFF: already power off at SUSPEND, crash
so use a bool val is more suitable.

Signed-off-by: Mark Yao <mark.yao@xxxxxxxxxxxxxx>
---
Changes in v2:
- fix mistake that set is_enabled wrong.

drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 34 ++++++++++++++-------------
1 file changed, 18 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index 9a5c571..d03eb7e 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -81,7 +81,7 @@ struct vop {
struct drm_crtc crtc;
struct device *dev;
struct drm_device *drm_dev;
- unsigned int dpms;
+ bool is_enabled;

int connector_type;
int connector_out_mode;
@@ -387,6 +387,9 @@ static void vop_enable(struct drm_crtc *crtc)
struct vop *vop = to_vop(crtc);
int ret;

+ if (vop->is_enabled)
+ return;
+
ret = clk_enable(vop->hclk);
if (ret < 0) {
dev_err(vop->dev, "failed to enable hclk - %d\n", ret);
@@ -427,6 +430,8 @@ static void vop_enable(struct drm_crtc *crtc)

drm_vblank_on(vop->drm_dev, vop->pipe);

+ vop->is_enabled = true;
+
return;

err_disable_aclk:
@@ -441,6 +446,9 @@ static void vop_disable(struct drm_crtc *crtc)
{
struct vop *vop = to_vop(crtc);

+ if (!vop->is_enabled)
+ return;
+
drm_vblank_off(crtc->dev, vop->pipe);

disable_irq(vop->irq);
@@ -463,6 +471,8 @@ static void vop_disable(struct drm_crtc *crtc)

clk_disable(vop->aclk);
clk_disable(vop->hclk);
+
+ vop->is_enabled = false;
}

/*
@@ -742,7 +752,7 @@ static int vop_crtc_enable_vblank(struct drm_crtc *crtc)
struct vop *vop = to_vop(crtc);
unsigned long flags;

- if (vop->dpms != DRM_MODE_DPMS_ON)
+ if (!vop->is_enabled)
return -EPERM;

spin_lock_irqsave(&vop->irq_lock, flags);
@@ -759,8 +769,9 @@ static void vop_crtc_disable_vblank(struct drm_crtc *crtc)
struct vop *vop = to_vop(crtc);
unsigned long flags;

- if (vop->dpms != DRM_MODE_DPMS_ON)
+ if (!vop->is_enabled)
return;
+
spin_lock_irqsave(&vop->irq_lock, flags);
vop_mask_write(vop, INTR_CTRL0, FS_INTR_MASK, FS_INTR_EN(0));
spin_unlock_irqrestore(&vop->irq_lock, flags);
@@ -773,15 +784,8 @@ static const struct rockchip_crtc_funcs private_crtc_funcs = {

static void vop_crtc_dpms(struct drm_crtc *crtc, int mode)
{
- struct vop *vop = to_vop(crtc);
-
DRM_DEBUG_KMS("crtc[%d] mode[%d]\n", crtc->base.id, mode);

- if (vop->dpms == mode) {
- DRM_DEBUG_KMS("desired dpms mode is same as previous one.\n");
- return;
- }
-
switch (mode) {
case DRM_MODE_DPMS_ON:
vop_enable(crtc);
@@ -795,8 +799,6 @@ static void vop_crtc_dpms(struct drm_crtc *crtc, int mode)
DRM_DEBUG_KMS("unspecified mode %d\n", mode);
break;
}
-
- vop->dpms = mode;
}

static void vop_crtc_prepare(struct drm_crtc *crtc)
@@ -934,9 +936,9 @@ static int vop_crtc_page_flip(struct drm_crtc *crtc,
struct drm_framebuffer *old_fb = crtc->primary->fb;
int ret;

- /* when the page flip is requested, crtc's dpms should be on */
- if (vop->dpms > DRM_MODE_DPMS_ON) {
- DRM_DEBUG("failed page flip request at dpms[%d].\n", vop->dpms);
+ /* when the page flip is requested, crtc should be on */
+ if (!vop->is_enabled) {
+ DRM_DEBUG("page flip request rejected because crtc is off.\n");
return 0;
}

@@ -1302,7 +1304,7 @@ static int vop_initial(struct vop *vop)

clk_disable(vop->hclk);

- vop->dpms = DRM_MODE_DPMS_OFF;
+ vop->is_enabled = false;

return 0;

--
1.7.9.5


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