drm/rockchip: dw_hdmi: Fix reading EDID when using a forced mode

EDID cannot be read on RK3328 until after read_hpd has been called and
correct io voltage has been configured based on connection status.

When a forced mode is used, e.g. video=1920x1080@60e, the connector
detect ops, that in turn normally calls the read_hpd, never gets called.

This result in reading EDID to fail in connector get_modes ops.

Call dw_hdmi_rk3328_read_hpd at end of dw_hdmi_rk3328_setup_hpd to
correct io voltage and allow reading EDID after setup_hpd.

Fixes: 1c53ba8f22a1 ("drm/rockchip: dw_hdmi: add dw-hdmi support for the rk3328")
Signed-off-by: Jonas Karlman <[e-mail]>
Signed-off-by: Heiko Stuebner <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

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

···
 		HIWORD_UPDATE(RK3328_HDMI_SDAIN_MSK | RK3328_HDMI_SCLIN_MSK,
 			      RK3328_HDMI_SDAIN_MSK | RK3328_HDMI_SCLIN_MSK |
 			      RK3328_HDMI_HPD_IOE));
+
+	dw_hdmi_rk3328_read_hpd(dw_hdmi, data);
 }
 
 static const struct dw_hdmi_phy_ops rk3228_hdmi_phy_ops = {