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authorChander Kashyap <chander.kashyap@linaro.org>2012-09-14 09:08:49 +0000
committerChris Ball <cjb@laptop.org>2012-10-03 10:05:26 -0400
commite684c46876f1d0c1c4964741244a34b6be837b5f (patch)
tree043654132b294ed118be2131851ed56a2de4a0dc /drivers/mmc
parent897b69e72054a39c1c1d99c8f334ffed6dc99ac4 (diff)
downloadlinux-e684c46876f1d0c1c4964741244a34b6be837b5f.tar.bz2
mmc: sdhci-s3c: Enable only required bus clock
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>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/sdhci-s3c.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c
index 0c77b10d2619..4d9acf833590 100644
--- a/drivers/mmc/host/sdhci-s3c.c
+++ b/drivers/mmc/host/sdhci-s3c.c
@@ -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]);
}
}