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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>,
        =?UTF-8?q?Marek=20Beh=C3=BAn?= <kabel@kernel.org>,
        Marcin Wojtas <mw@semihalf.com>,
        Ulf Hansson <ulf.hansson@linaro.org>
Subject: [PATCH 4.19 313/338] Revert "mmc: sdhci-xenon: fix annoying 1.8V regulator warning"
Date:   Thu, 14 Apr 2022 15:13:36 +0200
Message-Id: <20220414110847.788200136@linuxfoundation.org>
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From: Pali Rohár <pali@kernel.org>

commit 7e2646ed47542123168d43916b84b954532e5386 upstream.

This reverts commit bb32e1987bc55ce1db400faf47d85891da3c9b9f.

Commit 1a3ed0dc3594 ("mmc: sdhci-xenon: fix 1.8v regulator stabilization")
contains proper fix for the issue described in commit bb32e1987bc5 ("mmc:
sdhci-xenon: fix annoying 1.8V regulator warning").

Fixes: 8d876bf472db ("mmc: sdhci-xenon: wait 5ms after set 1.8V signal enable")
Cc: stable@vger.kernel.org # 1a3ed0dc3594 ("mmc: sdhci-xenon: fix 1.8v regulator stabilization")
Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <kabel@kernel.org>
Reviewed-by: Marcin Wojtas <mw@semihalf.com>
Link: https://lore.kernel.org/r/20220318141441.32329-1-pali@kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/mmc/host/sdhci-xenon.c |   10 ----------
 1 file changed, 10 deletions(-)

--- a/drivers/mmc/host/sdhci-xenon.c
+++ b/drivers/mmc/host/sdhci-xenon.c
@@ -243,16 +243,6 @@ static void xenon_voltage_switch(struct
 {
 	/* Wait for 5ms after set 1.8V signal enable bit */
 	usleep_range(5000, 5500);
-
-	/*
-	 * For some reason the controller's Host Control2 register reports
-	 * the bit representing 1.8V signaling as 0 when read after it was
-	 * written as 1. Subsequent read reports 1.
-	 *
-	 * Since this may cause some issues, do an empty read of the Host
-	 * Control2 register here to circumvent this.
-	 */
-	sdhci_readw(host, SDHCI_HOST_CONTROL2);
 }
 
 static const struct sdhci_ops sdhci_xenon_ops = {