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drm/bridge/synopsys: dw-hdmi: Add an option to suppress loading CEC driver 

This adds DW-HDMI driver a glue option to disable loading of the CEC sub-driver.

On some SoCs, the CEC functionality is enabled in the IP config bits, but the
CEC bus is non-functional like on Amlogic SoCs, where the CEC config bit is set
but the DW-HDMI CEC signal is not connected to a physical pin, leading to some
confusion when the DW-HDMI CEC controller can't communicate on the bus.

Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Link: https://patchwork.freedesktop.org/patch/msgid/20210416092737.1971876-2-narmstrong@baylibre.com
This commit is contained in:
Jernej Skrabec 2021-04-16 11:27:36 +02:00 committed by Neil Armstrong
parent 42be7ca1fd
commit cd7f72e6e7
2 changed files with 3 additions and 1 deletions
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2
drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
View File

@ -3421,7 +3421,7 @@ struct dw_hdmi *dw_hdmi_probe(struct platform_device *pdev,
hdmi->audio = platform_device_register_full(&pdevinfo);
}
if (config0 & HDMI_CONFIG0_CEC) {
if (!plat_data->disable_cec && (config0 & HDMI_CONFIG0_CEC)) {
cec.hdmi = hdmi;
cec.ops = &dw_hdmi_cec_ops;
cec.irq = irq;

2
include/drm/bridge/dw_hdmi.h
View File

@ -153,6 +153,8 @@ struct dw_hdmi_plat_data {
const struct dw_hdmi_phy_config *phy_config;
int (*configure_phy)(struct dw_hdmi *hdmi, void *data,
unsigned long mpixelclock);
unsigned int disable_cec : 1;
};
struct dw_hdmi *dw_hdmi_probe(struct platform_device *pdev,