Hi Chander,
Could you add the error control for clk_enable()?
On 09/14/2012 06:08 PM, Chander Kashyap wrote:
> 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@xxxxxxxxxx>
> ---
> drivers/mmc/host/sdhci-s3c.c | 12 +++++++-----
> 1 file changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c
> index 00969ba..0cbb4c2 100644
> --- a/drivers/mmc/host/sdhci-s3c.c
> +++ b/drivers/mmc/host/sdhci-s3c.c
> @@ -203,10 +203,12 @@ 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]);
> +
Did you consider the case that set_clock is assigned the sdhci_cmu_set_clock()?
> /* turn clock off to card before changing clock source */
> writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);
>
> @@ -501,8 +503,6 @@ 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));
> }
> @@ -513,6 +513,8 @@ 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) {
> @@ -621,9 +623,9 @@ 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]);
> }
> }
> @@ -658,9 +660,9 @@ 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]);
> }
> }
>
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