From: Yann Gautier <yann.gautier@foss.st.com>
To: Ulf Hansson <ulf.hansson@linaro.org>
Cc: <linux-kernel@vger.kernel.org>, <linux-mmc@vger.kernel.org>,
<linux-stm32@st-md-mailman.stormreply.com>,
Christophe Kerello <christophe.kerello@foss.st.com>,
Linus Walleij <linus.walleij@linaro.org>,
Ludovic Barre <ludovic.barre@foss.st.com>,
Philipp Zabel <p.zabel@pengutronix.de>,
Russell King <linux@armlinux.org.uk>, Marek Vasut <marex@denx.de>,
<kernel@dh-electronics.com>,
Manivannan Sadhasivam <mani@kernel.org>,
Grzegorz Szymaszek <gszymaszek@short.pl>,
Yann Gautier <yann.gautier@foss.st.com>
Subject: [PATCH v2] mmc: mmci: manage MMC_PM_KEEP_POWER per variant config
Date: Mon, 14 Mar 2022 13:55:54 +0100 [thread overview]
Message-ID: <20220314125554.190574-1-yann.gautier@foss.st.com> (raw)
In-Reply-To: <20220314095225.53563-1-yann.gautier@foss.st.com>
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 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.
The flag can still be enabled through DT property:
keep-power-in-suspend.
Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>
---
Update in v2:
Reword commit message to better explain the issue.
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
next prev parent reply other threads:[~2022-03-14 12:56 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-14 9:52 [PATCH RESEND] mmc: mmci: manage MMC_PM_KEEP_POWER per variant config Yann Gautier
2022-03-14 11:17 ` Ulf Hansson
2022-03-14 12:20 ` Yann Gautier
2022-03-14 12:53 ` Ulf Hansson
2022-03-14 12:55 ` Yann Gautier [this message]
2022-03-14 13:03 ` [PATCH v2] " Ulf Hansson
2022-03-14 14:34 ` Yann Gautier
2022-03-14 16:18 ` Ulf Hansson
2022-03-14 16:51 ` Yann Gautier
2022-03-15 9:07 ` Ulf Hansson
2022-03-15 10:07 ` Yann Gautier
2022-03-15 12:30 ` Ulf Hansson
2022-03-14 13:05 ` Philipp Zabel
2022-03-14 13:45 ` Yann Gautier
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