Commit c9107dd0 authored by Nicolas Saenz Julienne's avatar Nicolas Saenz Julienne Committed by Ulf Hansson
Browse files

mmc: sdhci-iproc: Cap min clock frequency on BCM2711

There is a known bug on BCM2711's SDHCI core integration where the
controller will hang when the difference between the core clock and the
bus clock is too great. Specifically this can be reproduced under the
following conditions:

- No SD card plugged in, polling thread is running, probing cards at
  100 kHz.
- BCM2711's core clock configured at 500MHz or more.

So set 200 kHz as the minimum clock frequency available for that board.

For more information on the issue see this:
https://lore.kernel.org/linux-mmc/20210322185816.27582-1-nsaenz@kernel.org/T/#m11f2783a09b581da6b8a15f302625b43a6ecdeca

Fixes: f84e411c

 ("mmc: sdhci-iproc: Add support for emmc2 of the BCM2711")
Signed-off-by: default avatarNicolas Saenz Julienne <nsaenz@kernel.org>
Signed-off-by: default avatarStefan Wahren <stefan.wahren@i2se.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/1628334401-6577-5-git-send-email-stefan.wahren@i2se.com

Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 67b13f3e
......@@ -173,6 +173,23 @@ static unsigned int sdhci_iproc_get_max_clock(struct sdhci_host *host)
return pltfm_host->clock;
}
/*
* There is a known bug on BCM2711's SDHCI core integration where the
* controller will hang when the difference between the core clock and the bus
* clock is too great. Specifically this can be reproduced under the following
* conditions:
*
* - No SD card plugged in, polling thread is running, probing cards at
* 100 kHz.
* - BCM2711's core clock configured at 500MHz or more
*
* So we set 200kHz as the minimum clock frequency available for that SoC.
*/
static unsigned int sdhci_iproc_bcm2711_get_min_clock(struct sdhci_host *host)
{
return 200000;
}
static const struct sdhci_ops sdhci_iproc_ops = {
.set_clock = sdhci_set_clock,
.get_max_clock = sdhci_iproc_get_max_clock,
......@@ -271,6 +288,7 @@ static const struct sdhci_ops sdhci_iproc_bcm2711_ops = {
.set_clock = sdhci_set_clock,
.set_power = sdhci_set_power_and_bus_voltage,
.get_max_clock = sdhci_iproc_get_max_clock,
.get_min_clock = sdhci_iproc_bcm2711_get_min_clock,
.set_bus_width = sdhci_set_bus_width,
.reset = sdhci_reset,
.set_uhs_signaling = sdhci_set_uhs_signaling,
......
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