Re: [PATCH v5 12/36] drm/bridge: analogix_dp: Set PD_INC_BG first when powering up edp phy

[Archit Taneja]

On Saturday 10 March 2018 03:53 AM, Enric Balletbo i Serra wrote:
> From: zain wang <wzz@xxxxxxxxxxxxxx>
>
> Following the correct power up sequence:
> dp_pd=ff => dp_pd=7f => wait 10us => dp_pd=00

Reviewed-by: Archit Taneja <architt@xxxxxxxxxxxxxx>

Thanks,
Archit

> Cc: StÃphane Marchesin <marcheu@xxxxxxxxxxxx>
> Signed-off-by: zain wang <wzz@xxxxxxxxxxxxxx>
> Signed-off-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
> Signed-off-by: Thierry Escande <thierry.escande@xxxxxxxxxxxxx>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx>
> Tested-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> ---
>
>   drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c | 10 ++++++++--
>   drivers/gpu/drm/bridge/analogix/analogix_dp_reg.h |  3 +++
>   2 files changed, 11 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> index b47c5af43560..bb72f8b0e603 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> @@ -321,10 +321,16 @@ void analogix_dp_set_analog_power_down(struct analogix_dp_device *dp,
>   		break;
>   	case POWER_ALL:
>   		if (enable) {
> -			reg = DP_PHY_PD | AUX_PD | CH3_PD | CH2_PD |
> -				CH1_PD | CH0_PD;
> +			reg = DP_ALL_PD;
>   			writel(reg, dp->reg_base + phy_pd_addr);
>   		} else {
> +			reg = DP_ALL_PD;
> +			writel(reg, dp->reg_base + phy_pd_addr);
> +			usleep_range(10, 15);
> +			reg &= ~DP_INC_BG;
> +			writel(reg, dp->reg_base + phy_pd_addr);
> +			usleep_range(10, 15);
> +
>   			writel(0x00, dp->reg_base + phy_pd_addr);
>   		}
>   		break;
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.h b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.h
> index 40200c652533..9602668669f4 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.h
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.h
> @@ -342,12 +342,15 @@
>   #define DP_PLL_REF_BIT_1_2500V			(0x7 << 0)
>   
>   /* ANALOGIX_DP_PHY_PD */
> +#define DP_INC_BG				(0x1 << 7)
> +#define DP_EXP_BG				(0x1 << 6)
>   #define DP_PHY_PD				(0x1 << 5)
>   #define AUX_PD					(0x1 << 4)
>   #define CH3_PD					(0x1 << 3)
>   #define CH2_PD					(0x1 << 2)
>   #define CH1_PD					(0x1 << 1)
>   #define CH0_PD					(0x1 << 0)
> +#define DP_ALL_PD				(0xff)
>   
>   /* ANALOGIX_DP_PHY_TEST */
>   #define MACRO_RST				(0x1 << 5)