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mmc: msm_sdcc: Clean up clock management and add a 10us delay after enabling clocks

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It appears that in some cases there may be a delay on the ARM9 in enabling our clock.
As a result, we may put the controller into a bad state. Delay 10us after enabling
clocks to let the peripheral settle. Note - this is all imperical.

Also ensure set_ios() callback grabs the host lock.

Signed-off-by: San Mehat <san@google.com>
Signed-off-by: Daniel Walker <dwalker@codeaurora.org>
This commit is contained in:
San Mehat 2009-11-08 13:00:37 -08:00 committed by Daniel Walker
parent 5b8a2fb34f
commit 4adbbcc7b6
1 changed files with 40 additions and 40 deletions
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80
drivers/mmc/host/msm_sdcc.c
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@ -735,20 +735,42 @@ msmsdcc_request(struct mmc_host *mmc, struct mmc_request *mrq)
spin_unlock_irqrestore(&host->lock, flags);
}
static int inline
msmsdcc_enable_clocks(struct msmsdcc_host *host, int enable)
{
int rc;
if (enable) {
rc = clk_enable(host->pclk);
if (rc)
return rc;
rc = clk_enable(host->clk);
if (rc) {
clk_disable(host->pclk);
return rc;
}
host->clks_on = 1;
udelay(10);
} else {
clk_disable(host->clk);
clk_disable(host->pclk);
host->clks_on = 0;
}
return 0;
}
static void
msmsdcc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct msmsdcc_host *host = mmc_priv(mmc);
u32 clk = 0, pwr = 0;
int rc;
unsigned long flags;
spin_lock_irqsave(&host->lock, flags);
if (ios->clock) {
if (!host->clks_on) {
clk_enable(host->pclk);
clk_enable(host->clk);
host->clks_on = 1;
}
if (!host->clks_on)
msmsdcc_enable_clocks(host, 1);
if (ios->clock != host->clk_rate) {
rc = clk_set_rate(host->clk, ios->clock);
if (rc < 0)
@ -793,11 +815,9 @@ msmsdcc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
writel(pwr, host->base + MMCIPOWER);
}
if (!(clk & MCI_CLK_ENABLE) && host->clks_on) {
clk_disable(host->clk);
clk_disable(host->pclk);
host->clks_on = 0;
}
if (!(clk & MCI_CLK_ENABLE) && host->clks_on)
msmsdcc_enable_clocks(host, 0);
spin_unlock_irqrestore(&host->lock, flags);
}
static void msmsdcc_enable_sdio_irq(struct mmc_host *mmc, int enable)
@ -899,7 +919,6 @@ msmsdcc_command_expired(unsigned long _data)
pr_err("%s: Command timeout (%p %p %p %p)\n",
mmc_hostname(host->mmc), mrq, mrq->cmd,
mrq->data, host->dma.sg);
mrq->cmd->error = -ETIMEDOUT;
msmsdcc_stop_data(host);
@ -1031,31 +1050,21 @@ msmsdcc_probe(struct platform_device *pdev)
*/
msmsdcc_init_dma(host);
/*
* Setup main peripheral bus clock
*/
/* Get our clocks */
host->pclk = clk_get(&pdev->dev, "sdc_pclk");
if (IS_ERR(host->pclk)) {
ret = PTR_ERR(host->pclk);
goto host_free;
}
ret = clk_enable(host->pclk);
if (ret)
goto pclk_put;
host->pclk_rate = clk_get_rate(host->pclk);
/*
* Setup SDC MMC clock
*/
host->clk = clk_get(&pdev->dev, "sdc_clk");
if (IS_ERR(host->clk)) {
ret = PTR_ERR(host->clk);
goto pclk_disable;
goto pclk_put;
}
ret = clk_enable(host->clk);
/* Enable clocks */
ret = msmsdcc_enable_clocks(host, 1);
if (ret)
goto clk_put;
@ -1065,10 +1074,9 @@ msmsdcc_probe(struct platform_device *pdev)
goto clk_disable;
}
host->pclk_rate = clk_get_rate(host->pclk);
host->clk_rate = clk_get_rate(host->clk);
host->clks_on = 1;
/*
* Setup MMC host structure
*/
@ -1187,11 +1195,9 @@ msmsdcc_probe(struct platform_device *pdev)
if (host->stat_irq)
free_irq(host->stat_irq, host);
clk_disable:
clk_disable(host->clk);
msmsdcc_enable_clocks(host, 0);
clk_put:
clk_put(host->clk);
pclk_disable:
clk_disable(host->pclk);
pclk_put:
clk_put(host->pclk);
host_free:
@ -1217,11 +1223,8 @@ msmsdcc_suspend(struct platform_device *dev, pm_message_t state)
if (!rc) {
writel(0, host->base + MMCIMASK0);
if (host->clks_on) {
clk_disable(host->clk);
clk_disable(host->pclk);
host->clks_on = 0;
}
if (host->clks_on)
msmsdcc_enable_clocks(host, 0);
}
}
return rc;
@ -1238,11 +1241,8 @@ msmsdcc_resume(struct platform_device *dev)
spin_lock_irqsave(&host->lock, flags);
if (!host->clks_on) {
clk_enable(host->pclk);
clk_enable(host->clk);
host->clks_on = 1;
}
if (!host->clks_on)
msmsdcc_enable_clocks(host, 1);
writel(host->saved_irq0mask, host->base + MMCIMASK0);