2022-04-22 15:00:47 +00:00
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From fcb0a88a6dc9dcf307064e16af12214cbbbdf4b3 Mon Sep 17 00:00:00 2001
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2021-11-24 17:32:01 +00:00
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From: Juerg Haefliger <juergh@canonical.com>
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Date: Wed, 29 Sep 2021 11:42:23 +0200
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2022-04-22 15:00:47 +00:00
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Subject: [PATCH 531/828] mmc: sdhci-iproc: Fix vmmc regulators (pre-bcm2711)
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2021-11-24 17:32:01 +00:00
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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.
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Signed-off-by: Juerg Haefliger <juergh@canonical.com>
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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drivers/mmc/host/sdhci-iproc.c | 1 +
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1 file changed, 1 insertion(+)
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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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2022-04-22 15:00:47 +00:00
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@@ -207,6 +207,7 @@ static const struct sdhci_ops sdhci_ipro
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2021-11-24 17:32:01 +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_set_power_and_bus_voltage,
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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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