| Message ID | 20200420080444.25242-1-marek.behun@nic.cz (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] mmc: sdhci-xenon: fix annoying 1.8V regulator warning | expand |
On Mon, 20 Apr 2020 at 10:04, Marek Behún <marek.behun@nic.cz> wrote: > > 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: Zhoujie Wu <zjwu@marvell.com> > Cc: Ulf Hansson <ulf.hansson@linaro.org> > Cc: Gregory CLEMENT <gregory.clement@free-electrons.com> > Cc: Vladimir Oltean <vladimir.oltean@nxp.com> > Cc: Konstantin Porotchkin <kostap@marvell.com> > Cc: Tomasz Maciej Nowak <tmn505@gmail.com> > Cc: Miquel Raynal <miquel.raynal@bootlin.com> Applied for fixes, thanks! Kind regards Uffe > --- > drivers/mmc/host/sdhci-xenon.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c > index 1dea1ba66f7b..4703cd540c7f 100644 > --- a/drivers/mmc/host/sdhci-xenon.c > +++ b/drivers/mmc/host/sdhci-xenon.c > @@ -235,6 +235,16 @@ 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 = { > -- > 2.24.1 >
diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c index 1dea1ba66f7b..4703cd540c7f 100644 --- a/drivers/mmc/host/sdhci-xenon.c +++ b/drivers/mmc/host/sdhci-xenon.c @@ -235,6 +235,16 @@ 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 = {
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: Zhoujie Wu <zjwu@marvell.com> Cc: Ulf Hansson <ulf.hansson@linaro.org> Cc: Gregory CLEMENT <gregory.clement@free-electrons.com> Cc: Vladimir Oltean <vladimir.oltean@nxp.com> Cc: Konstantin Porotchkin <kostap@marvell.com> Cc: Tomasz Maciej Nowak <tmn505@gmail.com> Cc: Miquel Raynal <miquel.raynal@bootlin.com> --- drivers/mmc/host/sdhci-xenon.c | 10 ++++++++++ 1 file changed, 10 insertions(+)