Messages in this thread | | | Date | Mon, 14 Mar 2022 13:20:32 +0100 | Subject | Re: [PATCH RESEND] mmc: mmci: manage MMC_PM_KEEP_POWER per variant config | From | Yann Gautier <> |
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On 3/14/22 12:17, Ulf Hansson wrote: > On Mon, 14 Mar 2022 at 10:53, Yann Gautier <yann.gautier@foss.st.com> wrote: >> >> Add a disable_keep_power field in variant_data struct. The >> MMC_PM_KEEP_POWER flag will be enabled if disable_keep_power is not set. >> It is only set to true for stm32_sdmmc variants. >> >> The issue was seen on STM32MP157C-DK2 board, which embeds a wifi chip. >> It doesn't correctly support low power, and we need to unbind the wifi >> driver before a suspend sequence. But the wifi chip firmware is then >> lost, and the communication with SDIO fails if MMC_PM_KEEP_POWER is >> enabled. > > So the platform supports to maintain the power for the embedded wifi > chip during system suspend, but the SDIO func driver (for the WiFi > chip) doesn't implement its part correctly. Did I get that right? > > In that case, it sounds to me like we should try to fix the support > for power management in the SDIO func driver instead, no? > I am happy to help with guidance/review if that is needed. What SDIO > func driver is this about? > > Kind regards > Uffe >
Hi Ulf,
I blindly pushed the patch without rechecking it. I rephrased it in our downstream to better explain the issue:
The issue was seen on STM32MP157C-DK2 board, which embeds a wifi chip. It doesn't correctly support low power on this board. The Wifi chip awaits an always-on regulator, but it was connected to v3v3 which is off in low-power sequence. MMC_PM_KEEP_POWER should then be disabled.
If it's OK for you, I'll resend the patch with the updated commit message.
Best regards, Yann
>> The flag can still be enabled through DT property: keep-power-in-suspend. >> >> Signed-off-by: Yann Gautier <yann.gautier@foss.st.com> >> --- >> Resend the patch alone. It was previoulsy in a series [1] for which the >> other patches will be reworked. >> >> [1] https://lore.kernel.org/lkml/20220304135134.47827-1-yann.gautier@foss.st.com/ >> >> drivers/mmc/host/mmci.c | 5 ++++- >> drivers/mmc/host/mmci.h | 1 + >> 2 files changed, 5 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c >> index 45b8608c935c..0e2f2f5d6a52 100644 >> --- a/drivers/mmc/host/mmci.c >> +++ b/drivers/mmc/host/mmci.c >> @@ -274,6 +274,7 @@ static struct variant_data variant_stm32_sdmmc = { >> .busy_detect = true, >> .busy_detect_flag = MCI_STM32_BUSYD0, >> .busy_detect_mask = MCI_STM32_BUSYD0ENDMASK, >> + .disable_keep_power = true, >> .init = sdmmc_variant_init, >> }; >> >> @@ -301,6 +302,7 @@ static struct variant_data variant_stm32_sdmmcv2 = { >> .busy_detect = true, >> .busy_detect_flag = MCI_STM32_BUSYD0, >> .busy_detect_mask = MCI_STM32_BUSYD0ENDMASK, >> + .disable_keep_power = true, >> .init = sdmmc_variant_init, >> }; >> >> @@ -2172,7 +2174,8 @@ static int mmci_probe(struct amba_device *dev, >> host->stop_abort.flags = MMC_RSP_R1B | MMC_CMD_AC; >> >> /* We support these PM capabilities. */ >> - mmc->pm_caps |= MMC_PM_KEEP_POWER; >> + if (!variant->disable_keep_power) >> + mmc->pm_caps |= MMC_PM_KEEP_POWER; >> >> /* >> * We can do SGIO >> diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h >> index e1a9b96a3396..2cad1ef9766a 100644 >> --- a/drivers/mmc/host/mmci.h >> +++ b/drivers/mmc/host/mmci.h >> @@ -361,6 +361,7 @@ struct variant_data { >> u32 opendrain; >> u8 dma_lli:1; >> u32 stm32_idmabsize_mask; >> + u8 disable_keep_power:1; >> void (*init)(struct mmci_host *host); >> }; >> >> -- >> 2.25.1 >>
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