media: rc: meson-ir: support PM suspend/resume

IR Controller could be used and updated by other processor
while kernel has been suspended.
Reinitialize IR Controller just in case while kernel is resuming.

Signed-off-by: Zelong Dong <zelong.dong@amlogic.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

diff --git a/drivers/media/rc/meson-ir.c b/drivers/media/rc/meson-ir.c
index 5303e6da58095eed1a2dcdded57e48fac3c45bf1..9cdb45821eccd6717ffe0bf15af5acac292a6f36 100644 (file)
--- a/drivers/media/rc/meson-ir.c
+++ b/drivers/media/rc/meson-ir.c
@@ -567,6 +567,32 @@ static void meson_ir_shutdown(struct platform_device *pdev)
        spin_unlock_irqrestore(&ir->lock, flags);
 }
 
+static __maybe_unused int meson_ir_resume(struct device *dev)
+{
+       struct meson_ir *ir = dev_get_drvdata(dev);
+
+       if (ir->param->support_hw_decoder)
+               meson_ir_hw_decoder_init(ir->rc, &ir->rc->enabled_protocols);
+       else
+               meson_ir_sw_decoder_init(ir->rc);
+
+       return 0;
+}
+
+static __maybe_unused int meson_ir_suspend(struct device *dev)
+{
+       struct meson_ir *ir = dev_get_drvdata(dev);
+       unsigned long flags;
+
+       spin_lock_irqsave(&ir->lock, flags);
+       regmap_update_bits(ir->reg, IR_DEC_REG1, IR_DEC_REG1_ENABLE, 0);
+       spin_unlock_irqrestore(&ir->lock, flags);
+
+       return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(meson_ir_pm_ops, meson_ir_suspend, meson_ir_resume);
+
 static const struct meson_ir_param meson6_ir_param = {
        .support_hw_decoder = false,
        .max_register = IR_DEC_REG1,
@@ -607,6 +633,7 @@ static struct platform_driver meson_ir_driver = {
        .driver = {
                .name           = DRIVER_NAME,
                .of_match_table = meson_ir_match,
+               .pm = pm_ptr(&meson_ir_pm_ops),
        },
 };