From: Stefan Agner <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 <stefan@agner.ch>
Subject: [PATCH 2/3] mmc: sdhci: add quirk to prevent higher speed modes
Date: Thu, 28 Jun 2018 10:13:30 +0200 [thread overview]
Message-ID: <20180628081331.13051-3-stefan@agner.ch> (raw)
In-Reply-To: <20180628081331.13051-1-stefan@agner.ch>
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 <stefan@agner.ch>
---
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 {
* obtainable timeout.
*/
#define SDHCI_QUIRK2_DISABLE_HW_TIMEOUT (1<<17)
+/* Do not support any higher speeds (>50MHz) */
+#define SDHCI_QUIRK2_NO_UHS_HS200_HS400 (1<<18)
int irq; /* Device IRQ */
void __iomem *ioaddr; /* Mapped address */
--
2.18.0
next prev parent reply other threads:[~2018-06-28 8:14 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-28 8:13 [PATCH 0/3] mmc: sdhci-esdhc-imx: fix no UHS modes Stefan Agner
2018-06-28 8:13 ` [PATCH 1/3] mmc: sdhci-esdhc-imx: get rid of support_vsel Stefan Agner
2018-07-02 14:36 ` Ulf Hansson
2018-07-05 2:52 ` A.s. Dong
2018-07-05 11:16 ` Stefan Agner
2018-06-28 8:13 ` Stefan Agner [this message]
2018-07-02 14:36 ` [PATCH 2/3] mmc: sdhci: add quirk to prevent higher speed modes Ulf Hansson
2018-07-03 8:48 ` Stefan Agner
2018-07-04 10:07 ` Ulf Hansson
2018-07-04 10:55 ` Stefan Agner
2018-07-04 11:16 ` Ulf Hansson
2018-07-04 13:18 ` Stefan Agner
2018-06-28 8:13 ` [PATCH 3/3] mmc: sdhci-esdhc-imx: prevent stack from using " Stefan Agner
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