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spi: disable_depth > 0 when pm runtime get sync

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Port the spi changes from bq-6125.
    when unit suspend, pm_runtime_disalbe() would be called. And
    then dev.power.disable_depth number will +1. And its value
    will be -1 when pm_runtime_enable() is called.
    And if spi bus want to work as soon as system resume, it will call
    pm_runtime_get_sync(), which would check the value of
    disable_depth. If its value is not 0, spi operation will fail.
    The sequence is as following:

    runtime_suspend
    pm_runtime_disable()-> disable_depth +1
    rumtime_resume
    pm_runtime_eanble() -> disable_depth -1
    spi_sync()
    pm_runtime_get_sync -> check the value of disable_depth

    But for sometimes, spi operation will earlier than pm_runtime_enable()
    called. Then spi_sync() will fail duel to non-zero disable_depth value.
    So we add a checking logic before pm_runtime_get_sync() to make sure
    disable_depth is 0.

Change-Id: I673363bfd861402b5c54874137b12700ef2df14d
Signed-off-by: wengjun1 <wengjun1@motorola.com>
Reviewed-on: https://gerrit.mot.com/1793166
SLTApproved: Slta Waiver
SME-Granted: SME Approvals Granted
Tested-by: Jira Key
Reviewed-by: Wei Wei <weiweij@motorola.com>
Reviewed-by: Huosheng Liao <liaohs@motorola.com>
Submit-Approved: Jira Key
This commit is contained in:
Haijian Ma 2020-11-04 14:43:36 +08:00 • committed by Xiaojun Ji
commit b6a7ab72bd
1 changed files with 6 additions and 0 deletions
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6
drivers/spi/spi-msm-geni.c
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@ -1366,6 +1366,12 @@ static int spi_geni_prepare_transfer_hardware(struct spi_master *spi)
"%s: Error %d pinctrl_select_state\n", __func__, ret);
}
if (mas->dev->power.disable_depth > 0) {
dev_err(mas->dev, "%s:disable_depth not zero %d\n",
__func__, mas->dev->power.disable_depth);
pm_runtime_enable(mas->dev);
}
if (!mas->setup || !mas->shared_ee) {
ret = pm_runtime_get_sync(mas->dev);
if (ret < 0) {