2021-08-21 08:54:34 +00:00
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From efc6e571660a0d0ca53fb603cc4f132481e8977f Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Fri, 2 Aug 2019 15:20:11 +0100
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Subject: [PATCH] mmc: sdhci-iproc: Fix vmmc regulators on iProc
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The Linux support for controlling card power via regulators appears to
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be contentious. I would argue that the default behaviour is contrary to
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the SDHCI spec - turning off the power writes a reserved value to the
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SD Bus Voltage Select field of the Power Control Register, which
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seems to kill the Arasan/iProc controller - but fortunately there is a
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hook in sdhci_ops to override the behaviour. Borrow the implementation
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from sdhci_arasan_set_power.
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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drivers/mmc/host/sdhci-iproc.c | 12 ++++++++++++
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1 file changed, 12 insertions(+)
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--- a/drivers/mmc/host/sdhci-iproc.c
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+++ b/drivers/mmc/host/sdhci-iproc.c
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2021-08-28 11:40:00 +00:00
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@@ -190,6 +190,17 @@ static unsigned int sdhci_iproc_bcm2711_
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return 200000;
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2021-08-21 08:54:34 +00:00
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}
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+static void sdhci_iproc_set_power(struct sdhci_host *host, unsigned char mode,
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+ unsigned short vdd)
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+{
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+ if (!IS_ERR(host->mmc->supply.vmmc)) {
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+ struct mmc_host *mmc = host->mmc;
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+
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+ mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
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+ }
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+ sdhci_set_power_noreg(host, mode, vdd);
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+}
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+
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static const struct sdhci_ops sdhci_iproc_ops = {
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.set_clock = sdhci_set_clock,
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.get_max_clock = sdhci_iproc_get_max_clock,
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2021-08-28 11:40:00 +00:00
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@@ -207,6 +218,7 @@ static const struct sdhci_ops sdhci_ipro
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2021-08-21 08:54:34 +00:00
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.write_b = sdhci_iproc_writeb,
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.set_clock = sdhci_set_clock,
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.get_max_clock = sdhci_iproc_get_max_clock,
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+ .set_power = sdhci_iproc_set_power,
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.set_bus_width = sdhci_set_bus_width,
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.reset = sdhci_reset,
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.set_uhs_signaling = sdhci_set_uhs_signaling,
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