mmc: sdhci-xenon: fix 1.8v regulator stabilization
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>
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@ -168,7 +168,12 @@ static void xenon_reset_exit(struct sdhci_host *host,
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/* Disable tuning request and auto-retuning again */
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xenon_retune_setup(host);
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xenon_set_acg(host, true);
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/*
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* The ACG should be turned off at the early init time, in order
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* to solve a possible issues with the 1.8V regulator stabilization.
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* The feature is enabled in later stage.
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*/
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xenon_set_acg(host, false);
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xenon_set_sdclk_off_idle(host, sdhc_id, false);
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