ASoC: rockchip: pdm: fix regmap_ops hang issue

[ Upstream commit c85064435fe7a216ec0f0238ef2b8f7cd850a450 ]

This is because set_fmt ops maybe called when PD is off,
and in such case, regmap_ops will lead system hang.
enale PD before doing regmap_ops.

Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/sound/soc/rockchip/rockchip_pdm.c b/sound/soc/rockchip/rockchip_pdm.c
index 400e29e..8a2e3bb 100644 (file)
--- a/sound/soc/rockchip/rockchip_pdm.c
+++ b/sound/soc/rockchip/rockchip_pdm.c
@@ -208,7 +208,9 @@ static int rockchip_pdm_set_fmt(struct snd_soc_dai *cpu_dai,
                return -EINVAL;
        }
 
+       pm_runtime_get_sync(cpu_dai->dev);
        regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, mask, val);
+       pm_runtime_put(cpu_dai->dev);
 
        return 0;
 }