linux-kernel - [PATCH V1] mmc: sdhci-msm: Ensure SD card power isn't ON when card removed

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Message-Id: <20241105093513.16800-1-quic_sartgarg@quicinc.com>
Date: Tue,  5 Nov 2024 15:05:13 +0530
From: Sarthak Garg <quic_sartgarg@...cinc.com>
To: Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc: linux-mmc@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_cang@...cinc.com,
        quic_nguyenb@...cinc.com, quic_rampraka@...cinc.com,
        quic_pragalla@...cinc.com, quic_sayalil@...cinc.com,
        quic_nitirawa@...cinc.com, quic_sachgupt@...cinc.com,
        quic_bhaskarv@...cinc.com, quic_narepall@...cinc.com,
        kernel@...cinc.com, Sarthak Garg <quic_sartgarg@...cinc.com>
Subject: [PATCH V1] mmc: sdhci-msm: Ensure SD card power isn't ON when card removed

Make sure SD card power is not enabled when the card is
being removed.
On multi-card tray designs, the same card-tray would be used for SD
card and SIM cards. If SD card is placed at the outermost location
in the tray, then SIM card may come in contact with SD card power-
supply while removing the tray. It may result in SIM damage.
So in sdhci_msm_handle_pwr_irq we skip the BUS_ON request when the
SD card is removed to be in consistent with the MGPI hardware fix to
prevent any damage to the SIM card in case of mult-card tray designs.
But we need to have a similar check in sdhci_msm_check_power_status to
be in consistent with the sdhci_msm_handle_pwr_irq function.
Also reset host->pwr and POWER_CONTROL register accordingly since we
are not turning ON the power actually.

Signed-off-by: Sarthak Garg <quic_sartgarg@...cinc.com>
---
 drivers/mmc/host/sdhci-msm.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index e00208535bd1..443526c56194 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -1516,10 +1516,11 @@ static void sdhci_msm_check_power_status(struct sdhci_host *host, u32 req_type)
 {
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 	struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
-	bool done = false;
-	u32 val = SWITCHABLE_SIGNALING_VOLTAGE;
 	const struct sdhci_msm_offset *msm_offset =
 					msm_host->offset;
+	struct mmc_host *mmc = host->mmc;
+	bool done = false;
+	u32 val = SWITCHABLE_SIGNALING_VOLTAGE;
 
 	pr_debug("%s: %s: request %d curr_pwr_state %x curr_io_level %x\n",
 			mmc_hostname(host->mmc), __func__, req_type,
@@ -1573,6 +1574,13 @@ static void sdhci_msm_check_power_status(struct sdhci_host *host, u32 req_type)
 				 "%s: pwr_irq for req: (%d) timed out\n",
 				 mmc_hostname(host->mmc), req_type);
 	}
+
+	if (mmc->card && mmc->ops && mmc->ops->get_cd &&
+		!mmc->ops->get_cd(mmc) && (req_type & REQ_BUS_ON)) {
+		sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
+		host->pwr = 0;
+	}
+
 	pr_debug("%s: %s: request %d done\n", mmc_hostname(host->mmc),
 			__func__, req_type);
 }
@@ -1631,6 +1639,14 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
 		udelay(10);
 	}
 
+	if (mmc->card && mmc->ops && mmc->ops->get_cd &&
+		!mmc->ops->get_cd(mmc) && irq_status & CORE_PWRCTL_BUS_ON) {
+		irq_ack = CORE_PWRCTL_BUS_FAIL;
+		msm_host_writel(msm_host, irq_ack, host,
+				msm_offset->core_pwrctl_ctl);
+		return;
+	}
+
 	/* Handle BUS ON/OFF*/
 	if (irq_status & CORE_PWRCTL_BUS_ON) {
 		pwr_state = REQ_BUS_ON;
-- 
2.17.1