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mmc: sdhci-s3c: Enable only required bus clock

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In case of multiple bus clock sources, all the clock sources were
getting enabled. As only one clock source is needed at the time hence
enable only the required bus clock.

This patch does as follows:
1.	In sdhci_s3c_probe enable only required bus clock source.

2.	Handle the disabling of old bus clock and enables the
	best clock selected in sdhci_s3c_set_clock().

Signed-off-by: Chander Kashyap <chander.kashyap@linaro.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Chander Kashyap 2012-09-14 09:08:49 +00:00 committed by Chris Ball
parent 897b69e720
commit e684c46876
1 changed files with 7 additions and 5 deletions
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12
drivers/mmc/host/sdhci-s3c.c
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@ -208,10 +208,12 @@ static void sdhci_s3c_set_clock(struct sdhci_host *host, unsigned int clock)
best_src, clock, best);
/* select the new clock source */
if (ourhost->cur_clk != best_src) {
struct clk *clk = ourhost->clk_bus[best_src];
clk_enable(clk);
clk_disable(ourhost->clk_bus[ourhost->cur_clk]);
/* turn clock off to card before changing clock source */
writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);
@ -625,8 +627,6 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
*/
sc->cur_clk = ptr;
clk_enable(clk);
dev_info(dev, "clock source %d: %s (%ld Hz)\n",
ptr, name, clk_get_rate(clk));
}
@ -637,6 +637,8 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
goto err_no_busclks;
}
clk_enable(sc->clk_bus[sc->cur_clk]);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
host->ioaddr = devm_request_and_ioremap(&pdev->dev, res);
if (!host->ioaddr) {
@ -745,9 +747,9 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
return 0;
err_req_regs:
clk_disable(sc->clk_bus[sc->cur_clk]);
for (ptr = 0; ptr < MAX_BUS_CLK; ptr++) {
if (sc->clk_bus[ptr]) {
clk_disable(sc->clk_bus[ptr]);
clk_put(sc->clk_bus[ptr]);
}
}
@ -788,9 +790,9 @@ static int __devexit sdhci_s3c_remove(struct platform_device *pdev)
pm_runtime_disable(&pdev->dev);
clk_disable(sc->clk_bus[sc->cur_clk]);
for (ptr = 0; ptr < 3; ptr++) {
if (sc->clk_bus[ptr]) {
clk_disable(sc->clk_bus[ptr]);
clk_put(sc->clk_bus[ptr]);
}
}