From: zain wang <w...@rock-chips.com>

Following the correct power up sequence:
dp_pd=ff => dp_pd=7f => wait 10us => dp_pd=00

Cc: St├ęphane Marchesin <marc...@chromium.org>
Signed-off-by: zain wang <w...@rock-chips.com>
Signed-off-by: Sean Paul <seanp...@chromium.org>
Signed-off-by: Thierry Escande <thierry.esca...@collabora.com>
Signed-off-by: Enric Balletbo i Serra <enric.balle...@collabora.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)
-- 
2.16.1

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