Re: [PATCH v4.1 3/4] drm/bridge: analogix_dp: add the PSR function support

[Yakir Yang <ykk@rock-chips.com>]

Sean,

On 07/15/2016 09:13 PM, Sean Paul wrote:
> On Fri, Jul 15, 2016 at 06:55:17PM +0800, Yakir Yang wrote:
>> The full name of PSR is Panel Self Refresh, panel device could refresh
>> itself with the hardware framebuffer in panel, this would make lots of
>> sense to save the power consumption.
>>
>> This patch have exported two symbols for platform driver to implement
>> the PSR function in hardware side:
>> - analogix_dp_active_psr()
>> - analogix_dp_inactive_psr()
>>
>> Signed-off-by: Yakir Yang <ykk@rock-chips.com>
> Reviewed-by: Sean Paul <seanpaul@chromium.org>

Thanks for your reviewed  :-D

- Yakir

>
>> ---
>> Changes in v4.1:
>> - Take use of existing edp_psr_vsc struct to swap HBx and DBx setting. (Sean)
>> - Remove PSR_VID_CRC_FLUSH setting analogix_dp_enable_psr_crc().
>> - Add comment about PBx magic numbers. (Sean)
>>
>> Changes in v4:
>> - Downgrade the PSR version print message to debug level. (Sean)
>> - Return 'void' instead of 'int' in analogix_dp_enable_sink_psr(). (Sean)
>> - Delete the unused read dpcd operations in analogix_dp_enable_sink_psr(). (Sean)
>> - Delete the arbitrary usleep_range in analogix_dp_enable_psr_crc. (Sean).
>> - Clean up the hardcoded values in analogix_dp_send_psr_spd(). (Sean)
>> - Rename "active/inactive" to "enable/disable". (Sean, Dominik)
>> - Keep set the PSR_VID_CRC_FLUSH gate in analogix_dp_enable_psr_crc().
>>
>> Changes in v3:
>> - split analogix_dp_enable_psr(), make it more clearly
>>      analogix_dp_detect_sink_psr()
>>      analogix_dp_enable_sink_psr()
>> - remove some nosie register setting comments
>>
>> Changes in v2:
>> - introduce in v2, splite the common Analogix DP changes out
>>
>>   drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 81 ++++++++++++++++++++++
>>   drivers/gpu/drm/bridge/analogix/analogix_dp_core.h |  5 ++
>>   drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c  | 51 ++++++++++++++
>>   drivers/gpu/drm/bridge/analogix/analogix_dp_reg.h  | 34 +++++++++
>>   include/drm/bridge/analogix_dp.h                   |  3 +
>>   5 files changed, 174 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> index 32715da..381b25e 100644
>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> @@ -97,6 +97,83 @@ static int analogix_dp_detect_hpd(struct analogix_dp_device *dp)
>>   	return 0;
>>   }
>>   
>> +int analogix_dp_enable_psr(struct device *dev)
>> +{
>> +	struct analogix_dp_device *dp = dev_get_drvdata(dev);
>> +	struct edp_vsc_psr psr_vsc;
>> +
>> +	if (!dp->psr_support)
>> +		return -EINVAL;
>> +
>> +	/* Prepare VSC packet as per EDP 1.4 spec, Table 6.9 */
>> +	memset(&psr_vsc, 0, sizeof(psr_vsc));
>> +	psr_vsc.sdp_header.HB0 = 0;
>> +	psr_vsc.sdp_header.HB1 = 0x7;
>> +	psr_vsc.sdp_header.HB2 = 0x2;
>> +	psr_vsc.sdp_header.HB3 = 0x8;
>> +
>> +	psr_vsc.DB0 = 0;
>> +	psr_vsc.DB1 = EDP_VSC_PSR_STATE_ACTIVE | EDP_VSC_PSR_CRC_VALUES_VALID;
>> +
>> +	analogix_dp_send_psr_spd(dp, &psr_vsc);
>> +	return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(analogix_dp_enable_psr);
>> +
>> +int analogix_dp_disable_psr(struct device *dev)
>> +{
>> +	struct analogix_dp_device *dp = dev_get_drvdata(dev);
>> +	struct edp_vsc_psr psr_vsc;
>> +
>> +	if (!dp->psr_support)
>> +		return -EINVAL;
>> +
>> +	/* Prepare VSC packet as per EDP 1.4 spec, Table 6.9 */
>> +	memset(&psr_vsc, 0, sizeof(psr_vsc));
>> +	psr_vsc.sdp_header.HB0 = 0;
>> +	psr_vsc.sdp_header.HB1 = 0x7;
>> +	psr_vsc.sdp_header.HB2 = 0x2;
>> +	psr_vsc.sdp_header.HB3 = 0x8;
>> +
>> +	psr_vsc.DB0 = 0;
>> +	psr_vsc.DB1 = 0;
>> +
>> +	analogix_dp_send_psr_spd(dp, &psr_vsc);
>> +	return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(analogix_dp_disable_psr);
>> +
>> +static bool analogix_dp_detect_sink_psr(struct analogix_dp_device *dp)
>> +{
>> +	unsigned char psr_version;
>> +
>> +	analogix_dp_read_byte_from_dpcd(dp, DP_PSR_SUPPORT, &psr_version);
>> +	dev_dbg(dp->dev, "Panel PSR version : %x\n", psr_version);
>> +
>> +	return (psr_version & DP_PSR_IS_SUPPORTED) ? true : false;
>> +}
>> +
>> +static void analogix_dp_enable_sink_psr(struct analogix_dp_device *dp)
>> +{
>> +	unsigned char psr_en;
>> +
>> +	/* Disable psr function */
>> +	analogix_dp_read_byte_from_dpcd(dp, DP_PSR_EN_CFG, &psr_en);
>> +	psr_en &= ~DP_PSR_ENABLE;
>> +	analogix_dp_write_byte_to_dpcd(dp, DP_PSR_EN_CFG, psr_en);
>> +
>> +	/* Main-Link transmitter remains active during PSR active states */
>> +	psr_en = DP_PSR_MAIN_LINK_ACTIVE | DP_PSR_CRC_VERIFICATION;
>> +	analogix_dp_write_byte_to_dpcd(dp, DP_PSR_EN_CFG, psr_en);
>> +
>> +	/* Enable psr function */
>> +	psr_en = DP_PSR_ENABLE | DP_PSR_MAIN_LINK_ACTIVE |
>> +		 DP_PSR_CRC_VERIFICATION;
>> +	analogix_dp_write_byte_to_dpcd(dp, DP_PSR_EN_CFG, psr_en);
>> +
>> +	analogix_dp_enable_psr_crc(dp);
>> +}
>> +
>>   static unsigned char analogix_dp_calc_edid_check_sum(unsigned char *edid_data)
>>   {
>>   	int i;
>> @@ -921,6 +998,10 @@ static void analogix_dp_commit(struct analogix_dp_device *dp)
>>   
>>   	/* Enable video */
>>   	analogix_dp_start_video(dp);
>> +
>> +	dp->psr_support = analogix_dp_detect_sink_psr(dp);
>> +	if (dp->psr_support)
>> +		analogix_dp_enable_sink_psr(dp);
>>   }
>>   
>>   int analogix_dp_get_modes(struct drm_connector *connector)
>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
>> index b456380..17fbcee 100644
>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
>> @@ -177,6 +177,7 @@ struct analogix_dp_device {
>>   	int			hpd_gpio;
>>   	bool                    force_hpd;
>>   	unsigned char           edid[EDID_BLOCK_LENGTH * 2];
>> +	bool			psr_support;
>>   
>>   	struct analogix_dp_plat_data *plat_data;
>>   };
>> @@ -278,4 +279,8 @@ int analogix_dp_is_video_stream_on(struct analogix_dp_device *dp);
>>   void analogix_dp_config_video_slave_mode(struct analogix_dp_device *dp);
>>   void analogix_dp_enable_scrambling(struct analogix_dp_device *dp);
>>   void analogix_dp_disable_scrambling(struct analogix_dp_device *dp);
>> +void analogix_dp_enable_psr_crc(struct analogix_dp_device *dp);
>> +void analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
>> +			      struct edp_vsc_psr *vsc);
>> +
>>   #endif /* _ANALOGIX_DP_CORE_H */
>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
>> index 48030f0..52c1b6b 100644
>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
>> @@ -1322,3 +1322,54 @@ void analogix_dp_disable_scrambling(struct analogix_dp_device *dp)
>>   	reg |= SCRAMBLING_DISABLE;
>>   	writel(reg, dp->reg_base + ANALOGIX_DP_TRAINING_PTN_SET);
>>   }
>> +
>> +void analogix_dp_enable_psr_crc(struct analogix_dp_device *dp)
>> +{
>> +	writel(PSR_VID_CRC_ENABLE, dp->reg_base + ANALOGIX_DP_CRC_CON);
>> +}
>> +
>> +void analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
>> +			      struct edp_vsc_psr *vsc)
>> +{
>> +	unsigned int val;
>> +
>> +	/* don't send info frame */
>> +	val = readl(dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
>> +	val &= ~IF_EN;
>> +	writel(val, dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
>> +
>> +	/* configure single frame update mode */
>> +	writel(PSR_FRAME_UP_TYPE_BURST | PSR_CRC_SEL_HARDWARE,
>> +	       dp->reg_base + ANALOGIX_DP_PSR_FRAME_UPDATE_CTRL);
>> +
>> +	/* configure VSC HB0~HB3 */
>> +	writel(vsc->sdp_header.HB0, dp->reg_base + ANALOGIX_DP_SPD_HB0);
>> +	writel(vsc->sdp_header.HB1, dp->reg_base + ANALOGIX_DP_SPD_HB1);
>> +	writel(vsc->sdp_header.HB2, dp->reg_base + ANALOGIX_DP_SPD_HB2);
>> +	writel(vsc->sdp_header.HB3, dp->reg_base + ANALOGIX_DP_SPD_HB3);
>> +
>> +	/* configure reused VSC PB0~PB3, magic number from vendor */
>> +	writel(0x00, dp->reg_base + ANALOGIX_DP_SPD_PB0);
>> +	writel(0x16, dp->reg_base + ANALOGIX_DP_SPD_PB1);
>> +	writel(0xCE, dp->reg_base + ANALOGIX_DP_SPD_PB2);
>> +	writel(0x5D, dp->reg_base + ANALOGIX_DP_SPD_PB3);
>> +
>> +	/* configure DB0 / DB1 values */
>> +	writel(vsc->DB0, dp->reg_base + ANALOGIX_DP_VSC_SHADOW_DB0);
>> +	writel(vsc->DB1, dp->reg_base + ANALOGIX_DP_VSC_SHADOW_DB1);
>> +
>> +	/* set reuse spd inforframe */
>> +	val = readl(dp->reg_base + ANALOGIX_DP_VIDEO_CTL_3);
>> +	val |= REUSE_SPD_EN;
>> +	writel(val, dp->reg_base + ANALOGIX_DP_VIDEO_CTL_3);
>> +
>> +	/* mark info frame update */
>> +	val = readl(dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
>> +	val = (val | IF_UP) & ~IF_EN;
>> +	writel(val, dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
>> +
>> +	/* send info frame */
>> +	val = readl(dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
>> +	val |= IF_EN;
>> +	writel(val, dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
>> +}
>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.h b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.h
>> index cdcc6c5..40200c6 100644
>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.h
>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.h
>> @@ -22,6 +22,8 @@
>>   #define ANALOGIX_DP_VIDEO_CTL_8			0x3C
>>   #define ANALOGIX_DP_VIDEO_CTL_10		0x44
>>   
>> +#define ANALOGIX_DP_SPDIF_AUDIO_CTL_0		0xD8
>> +
>>   #define ANALOGIX_DP_PLL_REG_1			0xfc
>>   #define ANALOGIX_DP_PLL_REG_2			0x9e4
>>   #define ANALOGIX_DP_PLL_REG_3			0x9e8
>> @@ -30,6 +32,21 @@
>>   
>>   #define ANALOGIX_DP_PD				0x12c
>>   
>> +#define ANALOGIX_DP_IF_TYPE			0x244
>> +#define ANALOGIX_DP_IF_PKT_DB1			0x254
>> +#define ANALOGIX_DP_IF_PKT_DB2			0x258
>> +#define ANALOGIX_DP_SPD_HB0			0x2F8
>> +#define ANALOGIX_DP_SPD_HB1			0x2FC
>> +#define ANALOGIX_DP_SPD_HB2			0x300
>> +#define ANALOGIX_DP_SPD_HB3			0x304
>> +#define ANALOGIX_DP_SPD_PB0			0x308
>> +#define ANALOGIX_DP_SPD_PB1			0x30C
>> +#define ANALOGIX_DP_SPD_PB2			0x310
>> +#define ANALOGIX_DP_SPD_PB3			0x314
>> +#define ANALOGIX_DP_PSR_FRAME_UPDATE_CTRL	0x318
>> +#define ANALOGIX_DP_VSC_SHADOW_DB0		0x31C
>> +#define ANALOGIX_DP_VSC_SHADOW_DB1		0x320
>> +
>>   #define ANALOGIX_DP_LANE_MAP			0x35C
>>   
>>   #define ANALOGIX_DP_ANALOG_CTL_1		0x370
>> @@ -103,6 +120,8 @@
>>   
>>   #define ANALOGIX_DP_SOC_GENERAL_CTL		0x800
>>   
>> +#define ANALOGIX_DP_CRC_CON			0x890
>> +
>>   /* ANALOGIX_DP_TX_SW_RESET */
>>   #define RESET_DP_TX				(0x1 << 0)
>>   
>> @@ -151,6 +170,7 @@
>>   #define VID_CHK_UPDATE_TYPE_SHIFT		(4)
>>   #define VID_CHK_UPDATE_TYPE_1			(0x1 << 4)
>>   #define VID_CHK_UPDATE_TYPE_0			(0x0 << 4)
>> +#define REUSE_SPD_EN				(0x1 << 3)
>>   
>>   /* ANALOGIX_DP_VIDEO_CTL_8 */
>>   #define VID_HRES_TH(x)				(((x) & 0xf) << 4)
>> @@ -167,6 +187,12 @@
>>   #define REF_CLK_27M				(0x0 << 0)
>>   #define REF_CLK_MASK				(0x1 << 0)
>>   
>> +/* ANALOGIX_DP_PSR_FRAME_UPDATE_CTRL */
>> +#define PSR_FRAME_UP_TYPE_BURST			(0x1 << 0)
>> +#define PSR_FRAME_UP_TYPE_SINGLE		(0x0 << 0)
>> +#define PSR_CRC_SEL_HARDWARE			(0x1 << 1)
>> +#define PSR_CRC_SEL_MANUALLY			(0x0 << 1)
>> +
>>   /* ANALOGIX_DP_LANE_MAP */
>>   #define LANE3_MAP_LOGIC_LANE_0			(0x0 << 6)
>>   #define LANE3_MAP_LOGIC_LANE_1			(0x1 << 6)
>> @@ -376,4 +402,12 @@
>>   #define VIDEO_MODE_SLAVE_MODE			(0x1 << 0)
>>   #define VIDEO_MODE_MASTER_MODE			(0x0 << 0)
>>   
>> +/* ANALOGIX_DP_PKT_SEND_CTL */
>> +#define IF_UP					(0x1 << 4)
>> +#define IF_EN					(0x1 << 0)
>> +
>> +/* ANALOGIX_DP_CRC_CON */
>> +#define PSR_VID_CRC_FLUSH			(0x1 << 2)
>> +#define PSR_VID_CRC_ENABLE			(0x1 << 0)
>> +
>>   #endif /* _ANALOGIX_DP_REG_H */
>> diff --git a/include/drm/bridge/analogix_dp.h b/include/drm/bridge/analogix_dp.h
>> index 261b86d..9cd8838 100644
>> --- a/include/drm/bridge/analogix_dp.h
>> +++ b/include/drm/bridge/analogix_dp.h
>> @@ -38,6 +38,9 @@ struct analogix_dp_plat_data {
>>   			 struct drm_connector *);
>>   };
>>   
>> +int analogix_dp_enable_psr(struct device *dev);
>> +int analogix_dp_disable_psr(struct device *dev);
>> +
>>   int analogix_dp_resume(struct device *dev);
>>   int analogix_dp_suspend(struct device *dev);
>>   
>> -- 
>> 1.9.1
>>
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
>


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