drm/bridge: analogix_dp: Split the platform-specific poweron in two parts

Some of the platform-specific stuff in rockchip_dp_poweron() needs to
happen before the generic code. Some needs to happen after. Let's
split the callback in two.

Specifically we can't start doing PSR work until _after_ the whole
controller is up, so don't set the enable until the end.

Cc: Kristian H. Kristensen <[e-mail]>
Signed-off-by: Douglas Anderson <[e-mail]>
[seanpaul added exynos change]
Signed-off-by: Sean Paul <[e-mail]>
Signed-off-by: Thierry Escande <[e-mail]>
Reviewed-by: Andrzej Hajda <[e-mail]>
Signed-off-by: Enric Balletbo i Serra <[e-mail]>
Tested-by: Marek Szyprowski <[e-mail]>
Reviewed-by: Archit Taneja <[e-mail]>
Signed-off-by: Andrzej Hajda <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/bridge/analogix/analogix_dp_core.c

···
 		goto out_dp_clk_pre;
 	}
 
-	if (dp->plat_data->power_on)
-		dp->plat_data->power_on(dp->plat_data);
+	if (dp->plat_data->power_on_start)
+		dp->plat_data->power_on_start(dp->plat_data);
 
 	phy_power_on(dp->phy);
 
···
 		DRM_ERROR("dp commit error, ret = %d\n", ret);
 		goto out_dp_init;
 	}
+
+	if (dp->plat_data->power_on_end)
+		dp->plat_data->power_on_end(dp->plat_data);
 
 	enable_irq(dp->irq);
 	return 0;

drivers/gpu/drm/exynos/exynos_dp.c

···
 	dp->drm_dev = drm_dev;
 
 	dp->plat_data.dev_type = EXYNOS_DP;
-	dp->plat_data.power_on = exynos_dp_poweron;
+	dp->plat_data.power_on_start = exynos_dp_poweron;
 	dp->plat_data.power_off = exynos_dp_poweroff;
 	dp->plat_data.attach = exynos_dp_bridge_attach;
 	dp->plat_data.get_modes = exynos_dp_get_modes;

drivers/gpu/drm/rockchip/analogix_dp-rockchip.c

···
 	return 0;
 }
 
-static int rockchip_dp_poweron(struct analogix_dp_plat_data *plat_data)
+static int rockchip_dp_poweron_start(struct analogix_dp_plat_data *plat_data)
 {
 	struct rockchip_dp_device *dp = to_dp(plat_data);
 	int ret;
···
 		clk_disable_unprepare(dp->pclk);
 		return ret;
 	}
+
+	return ret;
+}
+
+static int rockchip_dp_poweron_end(struct analogix_dp_plat_data *plat_data)
+{
+	struct rockchip_dp_device *dp = to_dp(plat_data);
 
 	return rockchip_drm_psr_activate(&dp->encoder);
 }
···
 	dp->plat_data.encoder = &dp->encoder;
 
 	dp->plat_data.dev_type = dp->data->chip_type;
-	dp->plat_data.power_on = rockchip_dp_poweron;
+	dp->plat_data.power_on_start = rockchip_dp_poweron_start;
+	dp->plat_data.power_on_end = rockchip_dp_poweron_end;
 	dp->plat_data.power_off = rockchip_dp_powerdown;
 	dp->plat_data.get_modes = rockchip_dp_get_modes;
 

include/drm/bridge/analogix_dp.h

···
 	struct drm_connector *connector;
 	bool skip_connector;
 
-	int (*power_on)(struct analogix_dp_plat_data *);
+	int (*power_on_start)(struct analogix_dp_plat_data *);
+	int (*power_on_end)(struct analogix_dp_plat_data *);
 	int (*power_off)(struct analogix_dp_plat_data *);
 	int (*attach)(struct analogix_dp_plat_data *, struct drm_bridge *,
 		      struct drm_connector *);