Revert "mmc: sdhci-xenon: fix annoying 1.8V regulator warning"

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>

diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c
index 0e5234a5ca2247bb76efa83083307a63f2200bf1..d509198c00c8af6b67630cad924e1a54ff8afc50 100644 (file)
--- a/drivers/mmc/host/sdhci-xenon.c
+++ b/drivers/mmc/host/sdhci-xenon.c
@@ -240,16 +240,6 @@ static void xenon_voltage_switch(struct sdhci_host *host)
 {
        /* 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 = {