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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-05-11 09:17:15 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-05-11 09:17:15 +0200 |
| commit | dd92b0133a78457e909da1d5916a05c342a897d6 (patch) | |
| tree | 1235c44f161872bba490d5e7ea20286f544b820c /drivers/mmc/host/sdhci-xenon.c | |
| parent | 378c1ee2227f67d4dbb748ff5193c959d5299095 (diff) | |
| parent | 2ef96a5bb12be62ef75b5828c0aab838ebb29cb8 (diff) | |
| download | linux-dd92b0133a78457e909da1d5916a05c342a897d6.tar.gz linux-dd92b0133a78457e909da1d5916a05c342a897d6.tar.bz2 linux-dd92b0133a78457e909da1d5916a05c342a897d6.zip | |
Merge 5.7-rc5 into char-misc-next
We want the char-misc fixes in here as well.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/mmc/host/sdhci-xenon.c')
| -rw-r--r-- | drivers/mmc/host/sdhci-xenon.c | 10 |
1 files changed, 10 insertions, 0 deletions
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 = { |