Re: [PATCH 2/3] mmc: sdhci-iproc: Cap min clock frequency on BCM2711
On Tue, 2021-04-06 at 19:59 +0200, Stefan Wahren wrote: > Hi Nicolas, > > Am 06.04.21 um 12:48 schrieb Nicolas Saenz Julienne: > > 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 > > 100KHz. > > - BCM2711's core clock configured at 500MHz or more. > > > > So set 200MHz as the minimum clock frequency available for that board. > i think it should be 200 kHz? Of course... Sorry for that. Regards, Nicolas > > > > For more information on the issue see this: > > https://lore.kernel.org/linux-mmc/20210322185816.27582-1-nsa...@kernel.org/T/#m11f2783a09b581da6b8a15f302625b43a6ecdeca > > > > Fixes: f84e411c85be ("mmc: sdhci-iproc: Add support for emmc2 of the > > BCM2711") > > Signed-off-by: Nicolas Saenz Julienne > > --- > > drivers/mmc/host/sdhci-iproc.c | 18 ++ > > 1 file changed, 18 insertions(+) > > > > diff --git a/drivers/mmc/host/sdhci-iproc.c b/drivers/mmc/host/sdhci-iproc.c > > index ddeaf8e1f72f..1ef888e91f73 100644 > > --- a/drivers/mmc/host/sdhci-iproc.c > > +++ b/drivers/mmc/host/sdhci-iproc.c > > @@ -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 > > + *100KHz. > > + * - BCM2711's core clock configured at 500MHz or more > > + * > > + * So we set 200MHz as the minimum clock frequency available for that SoC. > > + */ > > +static unsigned int sdhci_iproc_bcm2711_get_min_clock(struct sdhci_host > > *host) > > +{ > > + return 20; > > +} > > + > > 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, signature.asc Description: This is a digitally signed message part
Re: [PATCH 2/3] mmc: sdhci-iproc: Cap min clock frequency on BCM2711
Hi Nicolas, Am 06.04.21 um 12:48 schrieb Nicolas Saenz Julienne: > 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 > 100KHz. > - BCM2711's core clock configured at 500MHz or more. > > So set 200MHz as the minimum clock frequency available for that board. i think it should be 200 kHz? > > For more information on the issue see this: > https://lore.kernel.org/linux-mmc/20210322185816.27582-1-nsa...@kernel.org/T/#m11f2783a09b581da6b8a15f302625b43a6ecdeca > > Fixes: f84e411c85be ("mmc: sdhci-iproc: Add support for emmc2 of the BCM2711") > Signed-off-by: Nicolas Saenz Julienne > --- > drivers/mmc/host/sdhci-iproc.c | 18 ++ > 1 file changed, 18 insertions(+) > > diff --git a/drivers/mmc/host/sdhci-iproc.c b/drivers/mmc/host/sdhci-iproc.c > index ddeaf8e1f72f..1ef888e91f73 100644 > --- a/drivers/mmc/host/sdhci-iproc.c > +++ b/drivers/mmc/host/sdhci-iproc.c > @@ -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 > + *100KHz. > + * - BCM2711's core clock configured at 500MHz or more > + * > + * So we set 200MHz as the minimum clock frequency available for that SoC. > + */ > +static unsigned int sdhci_iproc_bcm2711_get_min_clock(struct sdhci_host > *host) > +{ > + return 20; > +} > + > 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,
[PATCH 2/3] 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 100KHz. - BCM2711's core clock configured at 500MHz or more. So set 200MHz 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-nsa...@kernel.org/T/#m11f2783a09b581da6b8a15f302625b43a6ecdeca Fixes: f84e411c85be ("mmc: sdhci-iproc: Add support for emmc2 of the BCM2711") Signed-off-by: Nicolas Saenz Julienne --- drivers/mmc/host/sdhci-iproc.c | 18 ++ 1 file changed, 18 insertions(+) diff --git a/drivers/mmc/host/sdhci-iproc.c b/drivers/mmc/host/sdhci-iproc.c index ddeaf8e1f72f..1ef888e91f73 100644 --- a/drivers/mmc/host/sdhci-iproc.c +++ b/drivers/mmc/host/sdhci-iproc.c @@ -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 + *100KHz. + * - BCM2711's core clock configured at 500MHz or more + * + * So we set 200MHz as the minimum clock frequency available for that SoC. + */ +static unsigned int sdhci_iproc_bcm2711_get_min_clock(struct sdhci_host *host) +{ + return 20; +} + 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, -- 2.30.2