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Commit 8546510f authored by Sarthak Garg's avatar Sarthak Garg Committed by Gerrit - the friendly Code Review server
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mmc: sdhci-msm: Reset SDIO cards during probe by toggling wlan_en pin 



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: default avatarSarthak Garg <sartgarg@codeaurora.org>
parent e1807351

drivers/mmc/host/sdhci-msm.c

+8 −0
Original line number Diff line number Diff line
@@ -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);