[PATCH 1/6] mmc: sdhci: add platfrom get_max_timeout hook
From: Dong Aisheng <hidden>
Date: 2013-12-10 12:56:03
Also in:
linux-mmc
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, secure digital host controller interface (sdhci) driver, the rest · Maintainers:
Ulf Hansson, Adrian Hunter, Linus Torvalds
Currently the max_discard_to is simply got by (1 << 27) / host->timeout_clk which is assumed to be the maximum timeout value, however, some platforms maximum timeout counter may not be 1 << 27, e.g. i.MX uSDHC is 1 << 28. Thus 1 << 27 may not be correct for such platforms. It is also possible that other platforms may have different problems. To be flexible, we add a get_max_timeout hook to get the correct maximum timeout value for these platforms. Signed-off-by: Dong Aisheng <redacted> Reported-by: Ed Sutter <redacted> --- drivers/mmc/host/sdhci.c | 5 ++++- drivers/mmc/host/sdhci.h | 1 + 2 files changed, 5 insertions(+), 1 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index bd8a098..464d42c 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c@@ -2930,7 +2930,10 @@ int sdhci_add_host(struct sdhci_host *host) if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK) host->timeout_clk = mmc->f_max / 1000; - mmc->max_discard_to = (1 << 27) / host->timeout_clk; + if (host->ops->get_max_timeout) + mmc->max_discard_to = host->ops->get_max_timeout(host); + else + mmc->max_discard_to = (1 << 27) / host->timeout_clk; mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE | MMC_CAP_CMD23;
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 0a3ed01..1591cbb 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h@@ -281,6 +281,7 @@ struct sdhci_ops { unsigned int (*get_max_clock)(struct sdhci_host *host); unsigned int (*get_min_clock)(struct sdhci_host *host); unsigned int (*get_timeout_clock)(struct sdhci_host *host); + unsigned int (*get_max_timeout)(struct sdhci_host *host); int (*platform_bus_width)(struct sdhci_host *host, int width); void (*platform_send_init_74_clocks)(struct sdhci_host *host,
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1.7.2.rc3