linux-kernel - Re: [PATCH] clk: exynos5250: Fix divider values for sclk

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Date:	Thu, 04 Apr 2013 14:33:31 -0700
From:	Mike Turquette <mturquette@...aro.org>
To:	Tushar Behera <tushar.behera@...aro.org>,
	linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org
Cc:	kgene.kim@...sung.com, patches@...aro.org,
	Thomas Abraham <thomas.abraham@...aro.org>
Subject: Re: [PATCH] clk: exynos5250: Fix divider values for sclk_mmc{0,1,2,3}

Quoting Tushar Behera (2013-04-02 01:20:40)
> In legacy setup, sclk_mmc{0,1,2,3} used PRE_RATIO bit-field (8-bit wide)
> instead of RATIO bit-field (4-bit wide) for dividing clock rate.
> 
> With current common clock setup, we are using RATIO bit-field which
> is creating FIFO read errors while accessing eMMC. Changing over to
> use PRE_RATIO bit-field fixes this issue.
> 
> dwmmc_exynos 12200000.dwmmc0: data FIFO error (status=00008020)
> mmcblk0: error -5 transferring data, sector 1, nr 7, cmd response 0x900, card status 0x0
> end_request: I/O error, dev mmcblk0, sector 1
> 
> Signed-off-by: Tushar Behera <tushar.behera@...aro.org>
> CC: Thomas Abraham <thomas.abraham@...aro.org>

I guess this will be applied through the samsung tree, so:

Acked-by: Mike Turquette <mturquette@...aro.org>

> ---
> 
> Based on Kukjin's for-next branch.
> commit d58f6a153f40 ("Merge branch 'next/clk-exynos-2' into for-next")
> 
>  drivers/clk/samsung/clk-exynos5250.c |    8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/clk/samsung/clk-exynos5250.c b/drivers/clk/samsung/clk-exynos5250.c
> index 1152125..2c46fbd 100644
> --- a/drivers/clk/samsung/clk-exynos5250.c
> +++ b/drivers/clk/samsung/clk-exynos5250.c
> @@ -274,10 +274,10 @@ struct samsung_div_clock exynos5250_div_clks[] __initdata = {
>         DIV(none, "div_pcm0", "sclk_audio0", DIV_MAU, 4, 8),
>         DIV(none, "div_sata", "mout_sata", DIV_FSYS0, 20, 4),
>         DIV(none, "div_usb3", "mout_usb3", DIV_FSYS0, 24, 4),
> -       DIV(none, "div_mmc0", "mout_mmc0", DIV_FSYS1, 0, 4),
> -       DIV(none, "div_mmc1", "mout_mmc1", DIV_FSYS1, 16, 4),
> -       DIV(none, "div_mmc2", "mout_mmc2", DIV_FSYS2, 0, 4),
> -       DIV(none, "div_mmc3", "mout_mmc3", DIV_FSYS2, 16, 4),
> +       DIV(none, "div_mmc0", "mout_mmc0", DIV_FSYS1, 8, 8),
> +       DIV(none, "div_mmc1", "mout_mmc1", DIV_FSYS1, 24, 8),
> +       DIV(none, "div_mmc2", "mout_mmc2", DIV_FSYS2, 8, 8),
> +       DIV(none, "div_mmc3", "mout_mmc3", DIV_FSYS2, 24, 8),
>         DIV(none, "div_uart0", "mout_uart0", DIV_PERIC0, 0, 4),
>         DIV(none, "div_uart1", "mout_uart1", DIV_PERIC0, 4, 4),
>         DIV(none, "div_uart2", "mout_uart2", DIV_PERIC0, 8, 4),
> -- 
> 1.7.9.5
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