6.15-stable review patch. If anyone has any objections, please let me know.
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From: Xinxin Wan xinxin.wan@intel.com
[ Upstream commit 19f971057b2d7b99c80530ec1052b45de236a8da ]
To be more resilient to codec-detection failures when the hardware powers on slowly, add retry mechanism to the device verification check. Similar pattern is found throughout a number of Realtek codecs. Our tests show that 60ms delay is sufficient to address readiness issues on rt5640 chip.
Reviewed-by: Amadeusz Sławiński amadeuszx.slawinski@linux.intel.com Reviewed-by: Cezary Rojewski cezary.rojewski@intel.com Signed-off-by: Xinxin Wan xinxin.wan@intel.com Signed-off-by: Cezary Rojewski cezary.rojewski@intel.com Link: https://patch.msgid.link/20250530142120.2944095-3-cezary.rojewski@intel.com Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- sound/soc/codecs/rt5640.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/sound/soc/codecs/rt5640.c b/sound/soc/codecs/rt5640.c index 21a18012b4c0..55881a5669e2 100644 --- a/sound/soc/codecs/rt5640.c +++ b/sound/soc/codecs/rt5640.c @@ -3013,6 +3013,11 @@ static int rt5640_i2c_probe(struct i2c_client *i2c) }
regmap_read(rt5640->regmap, RT5640_VENDOR_ID2, &val); + if (val != RT5640_DEVICE_ID) { + usleep_range(60000, 100000); + regmap_read(rt5640->regmap, RT5640_VENDOR_ID2, &val); + } + if (val != RT5640_DEVICE_ID) { dev_err(&i2c->dev, "Device with ID register %#x is not rt5640/39\n", val);