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CjhGWEdMNkFQY2xqQ3FqOEFKaHhReXN4ZG9pUVA4bS92dStialdHR3Z4dzVzMWxncGlSRFRS VVBnY0pKTmFHWTIKVklEclpRaTROU2lOUTBOSWkrZGp1NGZOTW1DcFFxZzh0YkMzY0FhNnl3 bTZvUUIxU0JobURYMmUxMWdSbGx1SQpPblRHUEUwSFRvM2w3MmxoYmc9PQo9cVpNVgotLS0t LUVORCBQR1AgUFVCTElDIEtFWSBCTE9DSy0tLS0tCg== Message-ID: <2d40b062-5809-15ce-b9d1-651644ff6e22@i2se.com> Date: Tue, 6 Apr 2021 19:59:02 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210406104802.20898-3-nsaenz@kernel.org> Content-Language: en-US X-Provags-ID: V03:K1:HbXlSJ1VmkEIfcoUmlqryotP1LF4zeV3Egt3g/YRugI5s3NQIB5 Ksj7UcPxJPHhmIXcIFHO11EiDGNNzKyvLCAB3H5ugIcPZuXixZlPJU3pMLlmJQoAU9hUzS0 +6yEsj9LB3ee2cHBL2CwGv0+OinucSmau9Wk5yFsGScl9YFABoOzXy3cPzhMgHqTKMRKs+o RU+mYDyriXkdGYNGAKs7Q== X-UI-Out-Filterresults: notjunk:1;V03:K0:lh2otc4WshI=:iNHAdOR/YKH0Axc6bJPPxO KToe9Wu5qd2ld1aByPUMGfi8dBS81MLHwbrdPbGxsabDL0NeHzwsU+LVzJGKcKTnq4/zdwOPU 9BNHTlPM6IO0hj7ggWM8FogpVTCs/5hdodxZrPZQQ0KJndCMJOn7GToAeAJFxA/b3Wlj3bNzF mc/wzyTrz29ddlRKeLUqyvlVskrGVw3Iha4rW65b662yuDI2SD9ib5RWDdRyjZQUSo4bEeN24 GL4/BeEbKKnity/WuEw3172AMVTiifp7gRcR+eYPx++nmLMn2O0SWWYAx/TgG024tk0xQmUpt vXHn9l3LQLUoeFc04FmkR/l5vd6j9ZXdVkH9Cbz7w71iO4lSxPhOyafLWK1udqB1oOUUfMZAt hSG1/lOb+0oY61KcFL5JpUTuBX+nRV4kJRwVjn3ZqmFMKA/BmMSMsGjVWBwiDjzfno3IU5Qgy nwL8UhdXYrxhwwiBTFZIfiH6Ebufae7WezaixqRMMSqu1sydgN3U X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210406_185927_811377_9AA46C35 X-CRM114-Status: GOOD ( 24.56 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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-nsaenz@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 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, _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel