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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2006-04-24 06:27:02 -0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-04-24 06:27:02 -0400
commit3d63abe56be2147891b3438cb3bd37a9be72bda7 (patch)
treeeec5568c93a8616888c2b66c8d8d17f10ee9e9fd /drivers/mmc
parent6b426e785cb81e53dc2fc4dcf997661472b470ef (diff)
[MMC] pxamci: fix data timeout calculation
The MMC layer gives us two parts for the timeout calculation - a fixed timeout in nanoseconds, and a card clock-speed dependent part. The PXA MMC hardware allows for a timeout based on the fixed host clock speed only. This resulted in some cards being given a short timeout, and therefore failing to work. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/pxamci.c10
1 files changed, 4 insertions, 6 deletions
diff --git a/drivers/mmc/pxamci.c b/drivers/mmc/pxamci.c
index eb9a8826e9b5..eb42cb349420 100644
--- a/drivers/mmc/pxamci.c
+++ b/drivers/mmc/pxamci.c
@@ -65,11 +65,6 @@ struct pxamci_host {
65 unsigned int dma_dir; 65 unsigned int dma_dir;
66}; 66};
67 67
68static inline unsigned int ns_to_clocks(unsigned int ns)
69{
70 return (ns * (CLOCKRATE / 1000000) + 999) / 1000;
71}
72
73static void pxamci_stop_clock(struct pxamci_host *host) 68static void pxamci_stop_clock(struct pxamci_host *host)
74{ 69{
75 if (readl(host->base + MMC_STAT) & STAT_CLK_EN) { 70 if (readl(host->base + MMC_STAT) & STAT_CLK_EN) {
@@ -113,6 +108,7 @@ static void pxamci_disable_irq(struct pxamci_host *host, unsigned int mask)
113static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data) 108static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
114{ 109{
115 unsigned int nob = data->blocks; 110 unsigned int nob = data->blocks;
111 unsigned long long clks;
116 unsigned int timeout; 112 unsigned int timeout;
117 u32 dcmd; 113 u32 dcmd;
118 int i; 114 int i;
@@ -125,7 +121,9 @@ static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
125 writel(nob, host->base + MMC_NOB); 121 writel(nob, host->base + MMC_NOB);
126 writel(1 << data->blksz_bits, host->base + MMC_BLKLEN); 122 writel(1 << data->blksz_bits, host->base + MMC_BLKLEN);
127 123
128 timeout = ns_to_clocks(data->timeout_ns) + data->timeout_clks; 124 clks = (unsigned long long)data->timeout_ns * CLOCKRATE;
125 do_div(clks, 1000000000UL);
126 timeout = (unsigned int)clks + (data->timeout_clks << host->clkrt);
129 writel((timeout + 255) / 256, host->base + MMC_RDTO); 127 writel((timeout + 255) / 256, host->base + MMC_RDTO);
130 128
131 if (data->flags & MMC_DATA_READ) { 129 if (data->flags & MMC_DATA_READ) {