From patchwork Thu Jun 28 08:13:30 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [2/3] mmc: sdhci: add quirk to prevent higher speed modes From: Stefan Agner X-Patchwork-Id: 10493273 Message-Id: <20180628081331.13051-3-stefan@agner.ch> To: adrian.hunter@intel.com, ulf.hansson@linaro.org Cc: fabio.estevam@nxp.com, haibo.chen@nxp.com, aisheng.dong@nxp.com, michael@amarulasolutions.com, rmk+kernel@armlinux.org.uk, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, Stefan Agner Date: Thu, 28 Jun 2018 10:13:30 +0200 Some hosts are capable of running higher speed modes but do not have the board support for it. Introduce a quirk which prevents the stack from using modes running at 100MHz or faster. Signed-off-by: Stefan Agner --- drivers/mmc/host/sdhci.c | 8 ++++++++ drivers/mmc/host/sdhci.h | 2 ++ 2 files changed, 10 insertions(+) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 1c828e0e9905..8ac257dfaab3 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -3749,6 +3749,14 @@ int sdhci_setup_host(struct sdhci_host *host) } } + if (host->quirks2 & SDHCI_QUIRK2_NO_UHS_HS200_HS400) { + host->caps1 &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 | + SDHCI_SUPPORT_DDR50); + + mmc->caps2 &= ~(MMC_CAP2_HSX00_1_8V | MMC_CAP2_HSX00_1_2V | + MMC_CAP2_HS400_ES); + } + if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V) { host->caps1 &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_DDR50); diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index 23966f887da6..cb2433d6d61f 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -450,6 +450,8 @@ struct sdhci_host { * block count. */ #define SDHCI_QUIRK2_USE_32BIT_BLK_CNT (1<<18) +/* Do not support any higher speeds (>50MHz) */ +#define SDHCI_QUIRK2_NO_UHS_HS200_HS400 (1<<19) int irq; /* Device IRQ */ void __iomem *ioaddr; /* Mapped address */