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drm: bridge: dw_hdmi: Add cec suspend/resume functions

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CEC interrupt status/mask and logical address registers
will be reset when device enter suspend.
It will cause cec fail to work after device resume.
Add CEC suspend/resume functions, reinitialize logical address registers
and restore interrupt status/mask registers after resume.

Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230721124415.1513223-1-Sandor.yu@nxp.com
This commit is contained in:
Sandor Yu 2023-07-21 20:44:15 +08:00 committed by Neil Armstrong
parent eae7488814
commit db1184e410
1 changed files with 37 additions and 0 deletions
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37
drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c
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@ -62,6 +62,10 @@ struct dw_hdmi_cec {
bool rx_done;
struct cec_notifier *notify;
int irq;
u8 regs_polarity;
u8 regs_mask;
u8 regs_mute_stat0;
};
static void dw_hdmi_write(struct dw_hdmi_cec *cec, u8 val, int offset)
@ -304,11 +308,44 @@ static void dw_hdmi_cec_remove(struct platform_device *pdev)
cec_unregister_adapter(cec->adap);
}
static int __maybe_unused dw_hdmi_cec_resume(struct device *dev)
{
struct dw_hdmi_cec *cec = dev_get_drvdata(dev);
/* Restore logical address */
dw_hdmi_write(cec, cec->addresses & 255, HDMI_CEC_ADDR_L);
dw_hdmi_write(cec, cec->addresses >> 8, HDMI_CEC_ADDR_H);
/* Restore interrupt status/mask registers */
dw_hdmi_write(cec, cec->regs_polarity, HDMI_CEC_POLARITY);
dw_hdmi_write(cec, cec->regs_mask, HDMI_CEC_MASK);
dw_hdmi_write(cec, cec->regs_mute_stat0, HDMI_IH_MUTE_CEC_STAT0);
return 0;
}
static int __maybe_unused dw_hdmi_cec_suspend(struct device *dev)
{
struct dw_hdmi_cec *cec = dev_get_drvdata(dev);
/* store interrupt status/mask registers */
cec->regs_polarity = dw_hdmi_read(cec, HDMI_CEC_POLARITY);
cec->regs_mask = dw_hdmi_read(cec, HDMI_CEC_MASK);
cec->regs_mute_stat0 = dw_hdmi_read(cec, HDMI_IH_MUTE_CEC_STAT0);
return 0;
}
static const struct dev_pm_ops dw_hdmi_cec_pm = {
SET_SYSTEM_SLEEP_PM_OPS(dw_hdmi_cec_suspend, dw_hdmi_cec_resume)
};
static struct platform_driver dw_hdmi_cec_driver = {
.probe = dw_hdmi_cec_probe,
.remove_new = dw_hdmi_cec_remove,
.driver = {
.name = "dw-hdmi-cec",
.pm = &dw_hdmi_cec_pm,
},
};
module_platform_driver(dw_hdmi_cec_driver);