linux-kernel - Re: [PATCH 1/2] drm/rockchip: vop use is

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <54C0BB29.3050104@rock-chips.com>
Date:	Thu, 22 Jan 2015 16:56:09 +0800
From:	Mark yao <mark.yao@...k-chips.com>
To:	David Airlie <airlied@...ux.ie>, Rob Clark <robdclark@...il.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Daniel Kurtz <djkurtz@...omium.org>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH 1/2] drm/rockchip: vop use is_enabled instead of dpms
 mode

On 2015年01月22日 15:33, Daniel Vetter wrote:
> On Thu, Jan 22, 2015 at 03:05:32PM +0800, Mark Yao wrote:
>> 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@...k-chips.com>
> Long term I highly suggest you switch to atomic, since with atomic all the
> legacy dpms modes are remapped to a simple on/off. Also the new atomic
> helpers make sure that your backend isn't called multiple times, so you
> can ditch all your is_enabled tracking with that.
> -Daniel
Hi Daniel
is there some documents teach me how to switch to atomic easily?
I found many other drivers which use atomic also remap dpms modes to 
simple on/off at its driver,
and I don't know where atomic helper do the remapped, can you give me 
some suggestions?

- Mark.
>> ---
>>   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..f278c09 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 = false;
>> +
>>   	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
>>
>>

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/