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mmc: sdhci-iproc: Fix vmmc regulators on iProc

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The Linux support for controlling card power via regulators appears to
be contentious. I would argue that the default behaviour is contrary to
the SDHCI spec - turning off the power writes a reserved value to the
SD Bus Voltage Select field of the Power Control Register, which
seems to kill the Arasan/iProc controller - but fortunately there is a
hook in sdhci_ops to override the behaviour. Borrow the implementation
from sdhci_arasan_set_power.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
This commit is contained in:
Phil Elwell
2019-08-02 15:20:11 +01:00
committed by popcornmix
parent cc17314462
commit aed19399a0
1 changed files with 12 additions and 0 deletions
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12
drivers/mmc/host/sdhci-iproc.c
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@@ -173,6 +173,17 @@ static unsigned int sdhci_iproc_get_max_clock(struct sdhci_host *host)
return pltfm_host->clock; return pltfm_host->clock;
} }
static void sdhci_iproc_set_power(struct sdhci_host *host, unsigned char mode,
unsigned short vdd)
{
if (!IS_ERR(host->mmc->supply.vmmc)) {
struct mmc_host *mmc = host->mmc;
mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
}
sdhci_set_power_noreg(host, mode, vdd);
}
static const struct sdhci_ops sdhci_iproc_ops = { static const struct sdhci_ops sdhci_iproc_ops = {
.set_clock = sdhci_set_clock, .set_clock = sdhci_set_clock,
.get_max_clock = sdhci_iproc_get_max_clock, .get_max_clock = sdhci_iproc_get_max_clock,
@@ -190,6 +201,7 @@ static const struct sdhci_ops sdhci_iproc_32only_ops = {
.write_b = sdhci_iproc_writeb, .write_b = sdhci_iproc_writeb,
.set_clock = sdhci_set_clock, .set_clock = sdhci_set_clock,
.get_max_clock = sdhci_iproc_get_max_clock, .get_max_clock = sdhci_iproc_get_max_clock,
.set_power = sdhci_iproc_set_power,
.set_bus_width = sdhci_set_bus_width, .set_bus_width = sdhci_set_bus_width,
.reset = sdhci_reset, .reset = sdhci_reset,
.set_uhs_signaling = sdhci_set_uhs_signaling, .set_uhs_signaling = sdhci_set_uhs_signaling,