Subject: [PATCH] PM / devfreq: mtk-cci: Handle sram regulator probe deferral

If the regulator_get_optional() call for the SRAM regulator returns
a probe deferral, we must bail out and retry probing later: failing
to do this will produce unstabilities on platforms requiring the
handling for this regulator.

Fixes: b615b00c42da ("PM / devfreq: mediatek: Introduce MediaTek CCI devfreq driver")
Signed-off-by: AngeloGioacchino Del Regno <[email protected]>
---
drivers/devfreq/mtk-cci-devfreq.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/devfreq/mtk-cci-devfreq.c b/drivers/devfreq/mtk-cci-devfreq.c
index 71abb3fbd042..e5458ada5197 100644
--- a/drivers/devfreq/mtk-cci-devfreq.c
+++ b/drivers/devfreq/mtk-cci-devfreq.c
@@ -291,9 +291,13 @@ static int mtk_ccifreq_probe(struct platform_device *pdev)
}

drv->sram_reg = devm_regulator_get_optional(dev, "sram");
- if (IS_ERR(drv->sram_reg))
+ if (IS_ERR(drv->sram_reg)) {
+ ret = PTR_ERR(drv->sram_reg);
+ if (ret == -EPROBE_DEFER)
+ goto out_free_resources;
+
drv->sram_reg = NULL;
- else {
+ } else {
ret = regulator_enable(drv->sram_reg);
if (ret) {
dev_err(dev, "failed to enable sram regulator\n");
--
2.35.1


2022-08-23 23:26:51

by Chanwoo Choi

[permalink] [raw]
Subject: Re: [PATCH] PM / devfreq: mtk-cci: Handle sram regulator probe deferral

On 22. 7. 13. 20:15, AngeloGioacchino Del Regno wrote:
> If the regulator_get_optional() call for the SRAM regulator returns
> a probe deferral, we must bail out and retry probing later: failing
> to do this will produce unstabilities on platforms requiring the
> handling for this regulator.
>
> Fixes: b615b00c42da ("PM / devfreq: mediatek: Introduce MediaTek CCI devfreq driver")
> Signed-off-by: AngeloGioacchino Del Regno <[email protected]>
> ---
> drivers/devfreq/mtk-cci-devfreq.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/devfreq/mtk-cci-devfreq.c b/drivers/devfreq/mtk-cci-devfreq.c
> index 71abb3fbd042..e5458ada5197 100644
> --- a/drivers/devfreq/mtk-cci-devfreq.c
> +++ b/drivers/devfreq/mtk-cci-devfreq.c
> @@ -291,9 +291,13 @@ static int mtk_ccifreq_probe(struct platform_device *pdev)
> }
>
> drv->sram_reg = devm_regulator_get_optional(dev, "sram");
> - if (IS_ERR(drv->sram_reg))
> + if (IS_ERR(drv->sram_reg)) {
> + ret = PTR_ERR(drv->sram_reg);
> + if (ret == -EPROBE_DEFER)
> + goto out_free_resources;
> +
> drv->sram_reg = NULL;
> - else {
> + } else {
> ret = regulator_enable(drv->sram_reg);
> if (ret) {
> dev_err(dev, "failed to enable sram regulator\n");

Applied it. Thanks

--
Best Regards,
Samsung Electronics
Chanwoo Choi