>From ab5cfb88aab633ef448749531a0b9ddb99a4ee1f Mon Sep 17 00:00:00 2001
From: Philip Rakity <prakity@xxxxxxxxxxx>
Date: Tue, 14 Dec 2010 16:56:41 -0800
Subject: [PATCH] sdhci: support setting f_max clock via call back
need ability to set f_max independent of max_clk.
setting max_clk does not work since our clock speed is fixed.
adjusting max_clk lower just messes up the clock dividers.
Signed-off-by: Philip Rakity <prakity@xxxxxxxxxxx>
---
drivers/mmc/host/sdhci.c | 8 +++++++-
drivers/mmc/host/sdhci.h | 1 +
2 files changed, 8 insertions(+), 1 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index f439881..6486009 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1884,7 +1884,13 @@ int sdhci_add_host(struct sdhci_host *host)
else
mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200;
- mmc->f_max = host->max_clk;
+ if (host->ops->get_f_max_clock) {
+ mmc->f_max = host->ops->get_f_max_clock(host);
+ if (mmc->f_max > host->max_clk)
+ mmc->f_max = host->max_clk;
+ } else
+ mmc->f_max = host->max_clk;
+
mmc->caps |= MMC_CAP_SDIO_IRQ;
/*
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 9dd7bc1..a8c43c9 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -224,6 +224,7 @@ struct sdhci_ops {
unsigned int (*get_ro)(struct sdhci_host *host);
void (*platform_reset_enter)(struct sdhci_host *host, u8 mask);
void (*platform_reset_exit)(struct sdhci_host *host, u8 mask);
+ unsigned int (*get_f_max_clock)(struct sdhci_host *host);
};
#ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
--
1.6.0.4
Attachment:
0008-sdhci-support-setting-f_max-clock-via-call-back.patch
Description: 0008-sdhci-support-setting-f_max-clock-via-call-back.patch
