Looks good to me.
Acked-by: Jaehoon Chung <jh80.ch...@samsung.com>
On 06/24/2014 10:57 PM, Tomasz Figa wrote:
> For internal card detection mechanism it is required that the local I/O
> clock is always running. However while current implementation accounts
> for this, it does so incorrectly leading to race conditions and warnings
> about unbalanced clock disables.
>
> This patch fixes it by inverting the logic, which now increases local
> I/O clock enable count when internal card detect is used, instead of
> decreasing it otherwise.
>
> Signed-off-by: Tomasz Figa <t.f...@samsung.com>
> Cc: Ben Dooks <ben-li...@fluff.org>
> Cc: Chris Ball <ch...@printf.net>
> Cc: Ulf Hansson <ulf.hans...@linaro.org>
> Cc: linux-...@vger.kernel.org
> ---
> drivers/mmc/host/sdhci-s3c.c | 17 ++++++++++-------
> 1 file changed, 10 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c
> index fa5954a..1795e1f 100644
> --- a/drivers/mmc/host/sdhci-s3c.c
> +++ b/drivers/mmc/host/sdhci-s3c.c
> @@ -487,8 +487,13 @@ static int sdhci_s3c_probe(struct platform_device *pdev)
> goto err_pdata_io_clk;
> }
>
> - /* enable the local io clock and keep it running for the moment. */
> - clk_prepare_enable(sc->clk_io);
> + /*
> + * Keep local I/O clock enabled for internal card detect pin
> + * or runtime PM is disabled.
> + */
> + if (pdata->cd_type == S3C_SDHCI_CD_INTERNAL
> + || !IS_ENABLED(CONFIG_PM_RUNTIME))
> + clk_prepare_enable(sc->clk_io);
>
> for (clks = 0, ptr = 0; ptr < MAX_BUS_CLK; ptr++) {
> char name[14];
> @@ -611,15 +616,13 @@ static int sdhci_s3c_probe(struct platform_device *pdev)
> goto err_req_regs;
> }
>
> -#ifdef CONFIG_PM_RUNTIME
> - if (pdata->cd_type != S3C_SDHCI_CD_INTERNAL)
> - clk_disable_unprepare(sc->clk_io);
> -#endif
> return 0;
>
> err_req_regs:
> err_no_busclks:
> - clk_disable_unprepare(sc->clk_io);
> + if (pdata->cd_type == S3C_SDHCI_CD_INTERNAL
> + || !IS_ENABLED(CONFIG_PM_RUNTIME))
> + clk_disable_unprepare(sc->clk_io);
>
> err_pdata_io_clk:
> sdhci_free_host(host);
>
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