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drivers/mci: pxa fix clockrate 

The clock rate was incorrectly calculated, leading to a
frequency of 19.5MHz / 64 instead of 19.5Mz for the host
controller.

with the fix applied, a copy of a file of 230 kB shrinks
from 6000ms to 123ms.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Robert Jarzmik 2011-12-19 22:03:05 +01:00 committed by Sascha Hauer
parent 6bef2778f1
commit 6449b9cff5
1 changed files with 9 additions and 5 deletions
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14
drivers/mci/pxamci.c
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@ -161,7 +161,8 @@ static int pxamci_transfer_data(struct pxamci_host *host,
static void pxamci_start_cmd(struct pxamci_host *host, struct mci_cmd *cmd,
unsigned int cmdat)
{
mci_dbg("cmd=(idx=%d,type=%d)\n", cmd->cmdidx, cmd->resp_type);
mci_dbg("cmd=(idx=%d,type=%d,clkrt=%d)\n", cmd->cmdidx, cmd->resp_type,
host->clkrt);
if (cmd->resp_type & MMC_RSP_BUSY)
cmdat |= CMDAT_BUSY;
@ -277,11 +278,14 @@ static void pxamci_set_ios(struct mci_host *mci, struct device_d *dev,
{
struct pxamci_host *host = to_pxamci(mci);
unsigned int clk_in = pxa_get_mmcclk();
unsigned long fact;
int fact;
mci_dbg("bus_width=%d, clock=%ud\n", bus_width, clock);
fact = min_t(int, clock / clk_in, 1);
fact = max_t(int, fact, 1 << 6);
mci_dbg("bus_width=%d, clock=%u\n", bus_width, clock);
if (clock)
fact = min_t(int, clk_in / clock, 1 << 6);
else
fact = 1 << 6;
fact = max_t(int, fact, 1);
/*
* We calculate clkrt here, and will write it on the next command