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

Archit Taneja
2018-03-14T06:10:43Z

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

Reviewed-by: Archit Taneja <architt@codeaurora.org>

Thanks,
Archit

> Cc: Stéphane Marchesin <marcheu@chromium.org>
> Signed-off-by: zain wang <wzz@rock-chips.com>
> Signed-off-by: Sean Paul <seanpaul@chromium.org>
> Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
> ---
>
> 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)
>
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