drm/bridge: analogix_dp: Fix incorrect operations with register ANALOGIX_DP_FUNC_EN_1

Register ANALOGIX_DP_FUNC_EN_1(offset 0x18), Rockchip is different to
Exynos:

on Exynos edp phy,
BIT 7		MASTER_VID_FUNC_EN_N
BIT 6		reserved
BIT 5		SLAVE_VID_FUNC_EN_N

on Rockchip edp phy,
BIT 7		reserved
BIT 6		RK_VID_CAP_FUNC_EN_N
BIT 5		RK_VID_FIFO_FUNC_EN_N

So, we should do some private operations to Rockchip.

Cc: Tomasz Figa <tfiga@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>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180423105003.9004-17-enric.balletbo@collabora.com

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

@@ -126,9 +126,14 @@ void analogix_dp_reset(struct analogix_dp_device *dp)
 	analogix_dp_stop_video(dp);
 	analogix_dp_enable_video_mute(dp, 0);
 
+	if (dp->plat_data && is_rockchip(dp->plat_data->dev_type))
+		reg = RK_VID_CAP_FUNC_EN_N | RK_VID_FIFO_FUNC_EN_N |
+			SW_FUNC_EN_N;
+	else
 		reg = MASTER_VID_FUNC_EN_N | SLAVE_VID_FUNC_EN_N |
 			AUD_FIFO_FUNC_EN_N | AUD_FUNC_EN_N |
 			HDCP_FUNC_EN_N | SW_FUNC_EN_N;
+
 	writel(reg, dp->reg_base + ANALOGIX_DP_FUNC_EN_1);
 
 	reg = SSC_FUNC_EN_N | AUX_FUNC_EN_N |
@@ -971,8 +976,12 @@ void analogix_dp_config_video_slave_mode(struct analogix_dp_device *dp)
 	u32 reg;
 
 	reg = readl(dp->reg_base + ANALOGIX_DP_FUNC_EN_1);
+	if (dp->plat_data && is_rockchip(dp->plat_data->dev_type)) {
+		reg &= ~(RK_VID_CAP_FUNC_EN_N | RK_VID_FIFO_FUNC_EN_N);
+	} else {
 		reg &= ~(MASTER_VID_FUNC_EN_N | SLAVE_VID_FUNC_EN_N);
 		reg |= MASTER_VID_FUNC_EN_N;
+	}
 	writel(reg, dp->reg_base + ANALOGIX_DP_FUNC_EN_1);
 
 	reg = readl(dp->reg_base + ANALOGIX_DP_VIDEO_CTL_10);

drivers/gpu/drm/bridge/analogix/analogix_dp_reg.h

@@ -127,7 +127,9 @@
 
 /* ANALOGIX_DP_FUNC_EN_1 */
 #define MASTER_VID_FUNC_EN_N			(0x1 << 7)
+#define RK_VID_CAP_FUNC_EN_N			(0x1 << 6)
 #define SLAVE_VID_FUNC_EN_N			(0x1 << 5)
+#define RK_VID_FIFO_FUNC_EN_N			(0x1 << 5)
 #define AUD_FIFO_FUNC_EN_N			(0x1 << 4)
 #define AUD_FUNC_EN_N				(0x1 << 3)
 #define HDCP_FUNC_EN_N				(0x1 << 2)