Hi Jaehoon Chung,
On 14 September 2012 15:25, Jaehoon Chung <jh80.chung@xxxxxxxxxxx> wrote:
> Hi Chander,
>
> Could you add the error control for clk_enable()?
It is maintained as original and clk is already checked for error using IS_ERR.
>
> 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()?
Yes considered.
>
>> /* 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]);
>> }
>> }
>>
>
--
with warm regards,
Chander Kashyap
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