From: Marek Behún marek.behun@nic.cz
commit bb32e1987bc55ce1db400faf47d85891da3c9b9f upstream.
For some reason the Host Control2 register of the Xenon SDHCI controller sometimes reports the bit representing 1.8V signaling as 0 when read after it was written as 1. Subsequent read reports 1.
This causes the sdhci_start_signal_voltage_switch function to report 1.8V regulator output did not become stable
When CONFIG_PM is enabled, the host is suspended and resumend many times, and in each resume the switch to 1.8V is called, and so the kernel log reports this message annoyingly often.
Do an empty read of the Host Control2 register in Xenon's .voltage_switch method to circumvent this.
This patch fixes this particular problem on Turris MOX.
Signed-off-by: Marek Behún marek.behun@nic.cz Fixes: 8d876bf472db ("mmc: sdhci-xenon: wait 5ms after set 1.8V...") Cc: stable@vger.kernel.org # v4.16+ Link: https://lore.kernel.org/r/20200420080444.25242-1-marek.behun@nic.cz 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 insertions(+)
--- a/drivers/mmc/host/sdhci-xenon.c +++ b/drivers/mmc/host/sdhci-xenon.c @@ -235,6 +235,16 @@ 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 = {