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mmc: sdhci-msm: Reset SDIO cards during probe by toggling wlan_en pin

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Wlan cards are powered by external supply so mmc_power_cycle won't
reset the card.
The only way to reset the wlan cards is by toggling wlan_en pin.
Moreover pinctrl sleep configuration don't get applied during reboot
by default leading to wlan cards in some unknown state post reboot.

Toggle wlan_en pin during probe to reset the card to proper state.

Change-Id: I3065a9d3bf6cddd9f34adb51dd20932df4125f86
Signed-off-by: Sarthak Garg <sartgarg@codeaurora.org>
This commit is contained in:
Sarthak Garg 2021-05-28 09:22:16 +05:30 committed by Gerrit - the friendly Code Review server
parent e18073515c
commit 8546510ffe
1 changed files with 8 additions and 0 deletions
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8
drivers/mmc/host/sdhci-msm.c
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@ -20,6 +20,7 @@
#include <linux/interrupt.h>
#include <linux/of.h>
#include <linux/reset.h>
#include <linux/pinctrl/consumer.h>
#include "sdhci-pltfm.h"
#include "cqhci.h"
@ -4379,6 +4380,13 @@ static int sdhci_msm_probe(struct platform_device *pdev)
}
}
/* Toggle wlan_en pin to reset SDIO card to correct state */
if (host->mmc->pm_caps & MMC_PM_KEEP_POWER) {
pinctrl_pm_select_sleep_state(&pdev->dev);
mdelay(1);
pinctrl_pm_select_default_state(&pdev->dev);
}
/* Reset the vendor spec register to power on reset state */
writel_relaxed(CORE_VENDOR_SPEC_POR_VAL,
host->ioaddr + msm_offset->core_vendor_spec);