[PATCH V3 1/6] mmc: sdhci: add platfrom get_max_timeout_count hook
From: Dong Aisheng <hidden>
Date: 2014-08-27 07:26:27
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 timeout count is hardcode to 1 << 27 for calcuate the max_busy_timeout, however, for some platforms the max timeout count may not be 1 << 27, e.g. i.MX uSDHC is 1 << 28. Thus 1 << 27 is not correct for such platform. It is also possible that other platforms may have different values. To be flexible, we add a get_max_timeout_count hook to get the correct maximum timeout value for these platforms. Reviewed-by: Shawn Guo <redacted> Signed-off-by: Dong Aisheng <redacted> --- drivers/mmc/host/sdhci.c | 11 ++++++++--- drivers/mmc/host/sdhci.h | 1 + 2 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 4cc2ff9..d633f288 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c@@ -1196,8 +1196,11 @@ clock_set: host->mmc->actual_clock = (host->max_clk * clk_mul) / real_div; if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK) { host->timeout_clk = host->mmc->actual_clock / 1000; - host->mmc->max_busy_timeout = - (1 << 27) / host->timeout_clk; + mmc->max_busy_timeout = + host->ops->get_max_timeout_count ? + host->ops->get_max_timeout_count(host) : + 1 << 27; + mmc->max_busy_timeout /= host->timeout_clk; } }
@@ -2937,7 +2940,9 @@ 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_busy_timeout = (1 << 27) / host->timeout_clk; + mmc->max_busy_timeout = host->ops->get_max_timeout_count ? + host->ops->get_max_timeout_count(host) : 1 << 27; + mmc->max_busy_timeout /= host->timeout_clk; mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE | MMC_CAP_CMD23; mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 4a5cd5e..b130509 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_count)(struct sdhci_host *host); void (*set_bus_width)(struct sdhci_host *host, int width); void (*platform_send_init_74_clocks)(struct sdhci_host *host, u8 power_mode);
--
1.7.8