Re: [PATCH v6 06/30] drm/bridge: analogix_dp: Set PD_INC_BG first when powering up edp phy

[Sasha Levin]

Hi,

[This is an automated email]

This commit has been processed by the -stable helper bot and determined
to be a high probability candidate for -stable trees. (score: 8.8719)

The bot has tested the following trees: v4.16, v4.15.15, v4.14.32, v4.9.92, 
v4.4.126.

v4.16: Build OK!
v4.15.15: Build OK!
v4.14.32: Build OK!
v4.9.92: Build OK!
v4.4.126: Failed to apply! Possible dependencies:
092f899420c9 ("drm: bridge: analogix/dp: rename register constants")
bcec20fd5ad6 ("drm: bridge: analogix/dp: add some rk3288 special registers 
setting")


Please let us know if you'd like to have this patch included in a stable tree.

--
Thanks,
Sasha
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[PATCH v6 06/30] drm/bridge: analogix_dp: Set PD_INC_BG first when powering up edp phy

[Enric Balletbo i Serra]

From: zain wang 

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

Cc: Stéphane Marchesin 
Signed-off-by: zain wang 
Signed-off-by: Sean Paul 
Signed-off-by: Thierry Escande 
Signed-off-by: Enric Balletbo i Serra 
Tested-by: Marek Szyprowski 
Reviewed-by: Archit Taneja 
---

 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)
-- 
2.16.3

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