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drm/rockchip: vop: power off until vop standby take effect

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Vop standby will take effect at end of current frame,
if dsp_hold_valid_irq happen, it means vop standby complete.

we must wait standby complete when we want to disable aclk,
if not, memory bus maybe dead.

Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
This commit is contained in:
Mark Yao 2015-02-04 13:10:31 +08:00
parent 52ab7891fb
commit 1067219b27
1 changed files with 66 additions and 15 deletions
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81
drivers/gpu/drm/rockchip/rockchip_drm_vop.c
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@ -89,6 +89,7 @@ struct vop {
/* mutex vsync_ work */
struct mutex vsync_mutex;
bool vsync_work_pending;
struct completion dsp_hold_completion;
const struct vop_data *data;
@ -382,6 +383,36 @@ static bool is_alpha_support(uint32_t format)
}
}
static void vop_dsp_hold_valid_irq_enable(struct vop *vop)
{
unsigned long flags;
if (WARN_ON(!vop->is_enabled))
return;
spin_lock_irqsave(&vop->irq_lock, flags);
vop_mask_write(vop, INTR_CTRL0, DSP_HOLD_VALID_INTR_MASK,
DSP_HOLD_VALID_INTR_EN(1));
spin_unlock_irqrestore(&vop->irq_lock, flags);
}
static void vop_dsp_hold_valid_irq_disable(struct vop *vop)
{
unsigned long flags;
if (WARN_ON(!vop->is_enabled))
return;
spin_lock_irqsave(&vop->irq_lock, flags);
vop_mask_write(vop, INTR_CTRL0, DSP_HOLD_VALID_INTR_MASK,
DSP_HOLD_VALID_INTR_EN(0));
spin_unlock_irqrestore(&vop->irq_lock, flags);
}
static void vop_enable(struct drm_crtc *crtc)
{
struct vop *vop = to_vop(crtc);
@ -454,26 +485,36 @@ static void vop_disable(struct drm_crtc *crtc)
drm_vblank_off(crtc->dev, vop->pipe);
disable_irq(vop->irq);
/*
* TODO: Since standby doesn't take effect until the next vblank,
* when we turn off dclk below, the vop is probably still active.
* Vop standby will take effect at end of current frame,
* if dsp hold valid irq happen, it means standby complete.
*
* we must wait standby complete when we want to disable aclk,
* if not, memory bus maybe dead.
*/
reinit_completion(&vop->dsp_hold_completion);
vop_dsp_hold_valid_irq_enable(vop);
spin_lock(&vop->reg_lock);
VOP_CTRL_SET(vop, standby, 1);
spin_unlock(&vop->reg_lock);
vop->is_enabled = false;
/*
* disable dclk to stop frame scan, so we can safely detach iommu,
*/
clk_disable(vop->dclk);
wait_for_completion(&vop->dsp_hold_completion);
vop_dsp_hold_valid_irq_disable(vop);
disable_irq(vop->irq);
vop->is_enabled = false;
/*
* vop standby complete, so iommu detach is safe.
*/
rockchip_drm_dma_detach_device(vop->drm_dev, vop->dev);
clk_disable(vop->dclk);
clk_disable(vop->aclk);
clk_disable(vop->hclk);
}
@ -1086,6 +1127,7 @@ static irqreturn_t vop_isr(int irq, void *data)
struct vop *vop = data;
uint32_t intr0_reg, active_irqs;
unsigned long flags;
int ret = IRQ_NONE;
/*
* INTR_CTRL0 register has interrupt status, enable and clear bits, we
@ -1104,15 +1146,23 @@ static irqreturn_t vop_isr(int irq, void *data)
if (!active_irqs)
return IRQ_NONE;
/* Only Frame Start Interrupt is enabled; other irqs are spurious. */
if (!(active_irqs & FS_INTR)) {
DRM_ERROR("Unknown VOP IRQs: %#02x\n", active_irqs);
return IRQ_NONE;
if (active_irqs & DSP_HOLD_VALID_INTR) {
complete(&vop->dsp_hold_completion);
active_irqs &= ~DSP_HOLD_VALID_INTR;
ret = IRQ_HANDLED;
}
drm_handle_vblank(vop->drm_dev, vop->pipe);
if (active_irqs & FS_INTR) {
drm_handle_vblank(vop->drm_dev, vop->pipe);
active_irqs &= ~FS_INTR;
ret = (vop->vsync_work_pending) ? IRQ_WAKE_THREAD : IRQ_HANDLED;
}
return (vop->vsync_work_pending) ? IRQ_WAKE_THREAD : IRQ_HANDLED;
/* Unhandled irqs are spurious. */
if (active_irqs)
DRM_ERROR("Unknown VOP IRQs: %#02x\n", active_irqs);
return ret;
}
static int vop_create_crtc(struct vop *vop)
@ -1194,6 +1244,7 @@ static int vop_create_crtc(struct vop *vop)
goto err_cleanup_crtc;
}
init_completion(&vop->dsp_hold_completion);
crtc->port = port;
vop->pipe = drm_crtc_index(crtc);
rockchip_register_crtc_funcs(drm_dev, &private_crtc_funcs, vop->pipe);