Fwd: [PATCH v5 2/6] drm/rockchip: dw_hdmi: Allow outputs that don't need output switching

So far we always encountered socs with 2 output crtcs needing the driver
to tell the hdmi block which output to connect to. But there also exist
socs with only one crtc like the rk3228, rk3328 and rk3368.

So adapt the register field to simply carry a negative value to signal
that no output-switching is necessary.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Robin Murphy <robin.murphy@arm.com>

changes in v3:
- fixed wording issue found by Robin Murphy
---
?drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c | 5 ++++-
?1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c 

b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
index 11309a2a4e43..b09c3531305b 100644

--- a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c

@@ -36,7 +36,7 @@

? * @lcdsel_lit: reg value of selecting vop little for HDMI
? */
?struct rockchip_hdmi_chip_data {
-??? u32??? lcdsel_grf_reg;
+??? int??? lcdsel_grf_reg;
???? u32??? lcdsel_big;
???? u32??? lcdsel_lit;
?};

@@ -245,6 +245,9 @@ static void dw_hdmi_rockchip_encoder_enable(struct 

drm_encoder *encoder)
???? u32 val;
???? int ret;
?+??? if (hdmi->chip_data->lcdsel_grf_reg < 0)
+??????? return;
+
???? ret = drm_of_encoder_active_endpoint_id(hdmi->dev->of_node, 
encoder);
???? if (ret)
???????? val = hdmi->chip_data->lcdsel_lit;