Re: [PATCH] ASoC: codecs: wcd934x: do not switch off SIDO Buck when codec is in use

On Thu, 7 Apr 2022 at 15:13, Srinivas Kandagatla srinivas.kandagatla@linaro.org wrote:

SIDO(Single-Inductor Dual-Ouput) Buck powers up both analog and digital circuits along with internal memory, powering off this is the last thing that codec should do when going to very low power.

Current code was powering off this Buck if there are no users of sysclk, which is not correct. Powering off this buck will result in no register access. This code path was never tested until recently after adding pm support in SoundWire controller. Fix this by removing the buck poweroff when the codec is active and also the code that is not used.

Without this patch all the read/write transactions will never complete and results in SLIMBus Errors like:

qcom,slim-ngd qcom,slim-ngd.1: Tx:MT:0x0, MC:0x60, LA:0xcf failed:-110 wcd934x-codec wcd934x-codec.1.auto: ASoC: error at soc_component_read_no_lock on wcd934x-codec.1.auto for register: [0x00000d05] -110 qcom,slim-ngd-ctrl 171c0000.slim: Error Interrupt received 0x82000000

Thanks Srinivas. It fixes the above regression I see on DB845c and Xiaomi Pocophone F1 running AOSP with v5.18-rc1.

Tested-by: Amit Pundir amit.pundir@linaro.org

Reported-by: Amit Pundir amit.pundir@linaro.org Fixes: a61f3b4f476e ("ASoC: wcd934x: add support to wcd9340/wcd9341 codec") Signed-off-by: Srinivas Kandagatla srinivas.kandagatla@linaro.org

---

sound/soc/codecs/wcd934x.c | 26 +------------------------- 1 file changed, 1 insertion(+), 25 deletions(-)

diff --git a/sound/soc/codecs/wcd934x.c b/sound/soc/codecs/wcd934x.c index 1e75e93cf28f..6298ebe96e94 100644 --- a/sound/soc/codecs/wcd934x.c +++ b/sound/soc/codecs/wcd934x.c @@ -1274,29 +1274,7 @@ static int wcd934x_set_sido_input_src(struct wcd934x_codec *wcd, int sido_src) if (sido_src == wcd->sido_input_src) return 0;

•   if (sido_src == SIDO_SOURCE_INTERNAL) {
  

•           regmap_update_bits(wcd->regmap, WCD934X_ANA_BUCK_CTL,
  

•                              WCD934X_ANA_BUCK_HI_ACCU_EN_MASK, 0);
  

•           usleep_range(100, 110);
  

•           regmap_update_bits(wcd->regmap, WCD934X_ANA_BUCK_CTL,
  

•                              WCD934X_ANA_BUCK_HI_ACCU_PRE_ENX_MASK, 0x0);
  

•           usleep_range(100, 110);
  

•           regmap_update_bits(wcd->regmap, WCD934X_ANA_RCO,
  

•                              WCD934X_ANA_RCO_BG_EN_MASK, 0);
  

•           usleep_range(100, 110);
  

•           regmap_update_bits(wcd->regmap, WCD934X_ANA_BUCK_CTL,
  

•                              WCD934X_ANA_BUCK_PRE_EN1_MASK,
  

•                              WCD934X_ANA_BUCK_PRE_EN1_ENABLE);
  

•           usleep_range(100, 110);
  

•           regmap_update_bits(wcd->regmap, WCD934X_ANA_BUCK_CTL,
  

•                              WCD934X_ANA_BUCK_PRE_EN2_MASK,
  

•                              WCD934X_ANA_BUCK_PRE_EN2_ENABLE);
  

•           usleep_range(100, 110);
  

•           regmap_update_bits(wcd->regmap, WCD934X_ANA_BUCK_CTL,
  

•                              WCD934X_ANA_BUCK_HI_ACCU_EN_MASK,
  

•                              WCD934X_ANA_BUCK_HI_ACCU_ENABLE);
  

•           usleep_range(100, 110);
  

•   } else if (sido_src == SIDO_SOURCE_RCO_BG) {
  

•   if (sido_src == SIDO_SOURCE_RCO_BG) {
            regmap_update_bits(wcd->regmap, WCD934X_ANA_RCO,
                               WCD934X_ANA_RCO_BG_EN_MASK,
                               WCD934X_ANA_RCO_BG_ENABLE);
  

@@ -1382,8 +1360,6 @@ static int wcd934x_disable_ana_bias_and_syclk(struct wcd934x_codec *wcd) regmap_update_bits(wcd->regmap, WCD934X_CLK_SYS_MCLK_PRG, WCD934X_EXT_CLK_BUF_EN_MASK | WCD934X_MCLK_EN_MASK, 0x0);

•   wcd934x_set_sido_input_src(wcd, SIDO_SOURCE_INTERNAL);
  

•   regmap_update_bits(wcd->regmap, WCD934X_ANA_BIAS,
                       WCD934X_ANA_BIAS_EN_MASK, 0);
    regmap_update_bits(wcd->regmap, WCD934X_ANA_BIAS,
  

-- 2.21.0