On 2015年01月31日 20:49, Heiko Stübner wrote:
> Hi Mark,
>
> Am Samstag, 31. Januar 2015, 16:41:38 schrieb Mark Yao:
>> Vop standby will take effect 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.
>>
>> Signed-off-by: Mark Yao <[email protected]>
>> ---
>> drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 76
>> ++++++++++++++++++++++----- 1 file changed, 63 insertions(+), 13
>> deletions(-)
>>
>> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
>> b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c index fb25836..47ea61f 100644
>> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
>> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
>> @@ -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 +383,34 @@ static bool is_alpha_support(uint32_t format)
>> }
>> }
>>
>> +static void vop_dsp_hold_valid_irq_enable(struct vop *vop)
>> +{
>> + unsigned long flags;
>> +
>> + BUG_ON(!vop->is_enabled);
> BUG_ON is generally not well liked in general error handling - i.e. in the
> !vop->is_enabled
> bad things may happen, but this may not always be the case. And BUG_ON
> effectively kills the machine.
>
> You could simply use a WARN_ON, so people see that something really strange is
> going on but can still try to recover things.
Right, got it.
>
>> +
>> + 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;
>> +
>> + BUG_ON(!vop->is_enabled);
> same here
>
>> +
>> + 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);
>
> except the above
> Reviewed-by: Heiko Stuebner <[email protected]>
>
> [but take it with a grain of salt, as I'm still new to drm-land :-) ]
Good, I saw your drm patches, I'm interested in those, very good.
Mark
>
> Heiko
>
>
>