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| author | Alex Leibovich <alexl@marvell.com> | 2020-12-11 15:16:56 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-01-27 11:05:35 +0100 |
| commit | bcf374506f46795d85cd9183f00b43af9d44c7db (patch) | |
| tree | d60fc94ac673dbbfd7aaa0b1d46696d58b340a9b /drivers | |
| parent | 11e702f83c2546810906e4b98c7be2091055170e (diff) | |
| download | linux-bcf374506f46795d85cd9183f00b43af9d44c7db.tar.gz linux-bcf374506f46795d85cd9183f00b43af9d44c7db.tar.bz2 linux-bcf374506f46795d85cd9183f00b43af9d44c7db.zip | |
mmc: sdhci-xenon: fix 1.8v regulator stabilization
commit 1a3ed0dc3594d99ff341ec63865a40519ea24b8d upstream.
Automatic Clock Gating is a feature used for the power consumption
optimisation. It turned out that during early init phase it may prevent the
stable voltage switch to 1.8V - due to that on some platforms an endless
printout in dmesg can be observed: "mmc1: 1.8V regulator output did not
became stable" Fix the problem by disabling the ACG at very beginning of
the sdhci_init and let that be enabled later.
Fixes: 3a3748dba881 ("mmc: sdhci-xenon: Add Marvell Xenon SDHC core functionality")
Signed-off-by: Alex Leibovich <alexl@marvell.com>
Signed-off-by: Marcin Wojtas <mw@semihalf.com>
Cc: stable@vger.kernel.org
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20201211141656.24915-1-mw@semihalf.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mmc/host/sdhci-xenon.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c index fafb02644efd..ca34fa424634 100644 --- a/drivers/mmc/host/sdhci-xenon.c +++ b/drivers/mmc/host/sdhci-xenon.c @@ -170,7 +170,12 @@ static void xenon_reset_exit(struct sdhci_host *host, /* Disable tuning request and auto-retuning again */ xenon_retune_setup(host); - xenon_set_acg(host, true); + /* + * The ACG should be turned off at the early init time, in order + * to solve a possible issues with the 1.8V regulator stabilization. + * The feature is enabled in later stage. + */ + xenon_set_acg(host, false); xenon_set_sdclk_off_idle(host, sdhc_id, false); |