[PATCH v4 4/4] drm/rockchip: analogix_dp: implement PSR function

[Yakir Yang]

Sean,

On 07/14/2016 11:26 PM, Sean Paul wrote:
> On Thu, Jul 14, 2016 at 12:15:58PM +0800, Yakir Yang wrote:
>> Alway enable the PSR function for Rockchip analogix_dp driver. If panel
>> don't support PSR, then the core analogix_dp would ignore this setting.
>>
>> Signed-off-by: Yakir Yang <ykk at rock-chips.com>
> Reviewed-by: Sean Paul <seanpaul at chromium.org>

Thanks :-D

- Yakir

>> ---
>> Changes in v4:
>> - Return 'void' instead of 'int' in analogix_dp_psr_set(). (Sean)
>> - Pull the 10ms delay time out into a #define. (Sean)
>> - Improved the code of analogix_dp_psr_work(). (Sean)
>> - Indented with spaces for new numbers in rockchip_dp_device struct. (Stéphane, reviewed at Google gerrit)
>>      [https://chromium-review.googlesource.com/#/c/349085/33/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c@83]
>>
>> Changes in v3:
>> - split the common psr logic into a seperate driver, make this to a
>>    simple sub-psr device driver.
>>
>> Changes in v2:
>> - remove vblank notify out (Daniel)
>> - create a psr_active() callback in vop data struct.
>>
>>   drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 57 +++++++++++++++++++++++++
>>   1 file changed, 57 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
>> index e81e19a..aa916f4 100644
>> --- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
>> +++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
>> @@ -32,6 +32,7 @@
>>   #include <drm/bridge/analogix_dp.h>
>>   
>>   #include "rockchip_drm_drv.h"
>> +#include "rockchip_drm_psr.h"
>>   #include "rockchip_drm_vop.h"
>>   
>>   #define RK3288_GRF_SOC_CON6		0x25c
>> @@ -41,6 +42,9 @@
>>   
>>   #define HIWORD_UPDATE(val, mask)	(val | (mask) << 16)
>>   
>> +#define PSR_SET_DELAY_TIME		msecs_to_jiffies(10)
>> +#define PSR_WAIT_LINE_FLAG_TIMEOUT_MS	100
>> +
>>   #define to_dp(nm)	container_of(nm, struct rockchip_dp_device, nm)
>>   
>>   /**
>> @@ -68,11 +72,55 @@ struct rockchip_dp_device {
>>   	struct regmap            *grf;
>>   	struct reset_control     *rst;
>>   
>> +	struct delayed_work      psr_work;
>> +	unsigned int             psr_state;
>> +
>>   	const struct rockchip_dp_chip_data *data;
>>   
>>   	struct analogix_dp_plat_data plat_data;
>>   };
>>   
>> +static void analogix_dp_psr_set(struct drm_encoder *encoder, bool enabled)
>> +{
>> +	struct rockchip_dp_device *dp = to_dp(encoder);
>> +
>> +	dev_dbg(dp->dev, "%s PSR...\n", enabled ? "Entry" : "Exit");
>> +
>> +	if (enabled)
>> +		dp->psr_state = EDP_VSC_PSR_STATE_ACTIVE;
>> +	else
>> +		dp->psr_state = ~EDP_VSC_PSR_STATE_ACTIVE;
>> +
>> +	schedule_delayed_work(&dp->psr_work, PSR_SET_DELAY_TIME);
>> +}
>> +
>> +static void analogix_dp_psr_work(struct work_struct *work)
>> +{
>> +	struct rockchip_dp_device *dp =
>> +				container_of(work, typeof(*dp), psr_work.work);
>> +	struct drm_crtc *crtc = dp->encoder.crtc;
>> +	int psr_state = dp->psr_state;
>> +	int vact_end;
>> +	int ret;
>> +
>> +	if (!crtc)
>> +		return;
>> +
>> +	vact_end = crtc->mode.vtotal - crtc->mode.vsync_start + crtc->mode.vdisplay;
>> +
>> +	ret = rockchip_drm_wait_line_flag(dp->encoder.crtc, vact_end,
>> +					  PSR_WAIT_LINE_FLAG_TIMEOUT_MS);
>> +	if (ret) {
>> +		dev_err(dp->dev, "line flag interrupt did not arrive\n");
>> +		return;
>> +	}
>> +
>> +	if (psr_state == EDP_VSC_PSR_STATE_ACTIVE)
>> +		analogix_dp_enable_psr(dp->dev);
>> +	else
>> +		analogix_dp_disable_psr(dp->dev);
>> +}
>> +
>>   static int rockchip_dp_pre_init(struct rockchip_dp_device *dp)
>>   {
>>   	reset_control_assert(dp->rst);
>> @@ -340,12 +388,21 @@ static int rockchip_dp_bind(struct device *dev, struct device *master,
>>   	dp->plat_data.power_off = rockchip_dp_powerdown;
>>   	dp->plat_data.get_modes = rockchip_dp_get_modes;
>>   
>> +	dp->psr_state = ~EDP_VSC_PSR_STATE_ACTIVE;
>> +	INIT_DELAYED_WORK(&dp->psr_work, analogix_dp_psr_work);
>> +
>> +	rockchip_drm_psr_register(&dp->encoder, analogix_dp_psr_set);
>> +
>>   	return analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
>>   }
>>   
>>   static void rockchip_dp_unbind(struct device *dev, struct device *master,
>>   			       void *data)
>>   {
>> +	struct rockchip_dp_device *dp = dev_get_drvdata(dev);
>> +
>> +	rockchip_drm_psr_unregister(&dp->encoder);
>> +
>>   	return analogix_dp_unbind(dev, master, data);
>>   }
>>   
>> -- 
>> 1.9.1
>>
>>
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