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drm/rockchip: dw_hdmi: Allow outputs that don't need output switching

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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.

changes in v3:
- fixed wording issue found by Robin Murphy

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Zheng Yang <zhengyang@rock-chips.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180912124740.20343-3-heiko@sntech.de
This commit is contained in:
Heiko Stuebner 2018-09-12 14:47:36 +02:00
parent 8faff37409
commit 96c4704fec
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
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@ -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;