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Message-ID: <20160908115849.GS4921@dell>
Date: Thu, 8 Sep 2016 12:58:49 +0100
From: Lee Jones <lee.jones@...aro.org>
To: ulf.hansson@...aro.org, patrice.chotard@...com,
peter.griffin@...aro.org, robh@...nel.org, adrian.hunter@...el.com
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
kernel@...inux.com, stable@...r.kernel.org,
linux-mmc@...r.kernel.org
Subject: Re: [PATCH 4/4] mmc: sdhci-st: Handle interconnect clock
Sorry Adrian, left you of the list. Rectifying.
FYI, this patch is due for the v4.8 -rcs:
http://www.spinics.net/lists/kernel/msg2338219.html
> Some ST platforms contain interconnect (ICN) clocks which must be handed
> correctly in order to obtain full functionality of a given IP. In this
> case, if the ICN clocks are not handled properly by the ST SDHCI driver
> MMC will break and the following output can be observed:
>
> [ 13.916949] mmc0: Timeout waiting for hardware interrupt.
> [ 13.922349] sdhci: =========== REGISTER DUMP (mmc0)===========
> [ 13.928175] sdhci: Sys addr: 0x00000000 | Version: 0x00001002
> [ 13.933999] sdhci: Blk size: 0x00007040 | Blk cnt: 0x00000001
> [ 13.939825] sdhci: Argument: 0x00fffff0 | Trn mode: 0x00000013
> [ 13.945650] sdhci: Present: 0x1fff0206 | Host ctl: 0x00000011
> [ 13.951475] sdhci: Power: 0x0000000f | Blk gap: 0x00000080
> [ 13.957300] sdhci: Wake-up: 0x00000000 | Clock: 0x00003f07
> [ 13.963126] sdhci: Timeout: 0x00000004 | Int stat: 0x00000000
> [ 13.968952] sdhci: Int enab: 0x02ff008b | Sig enab: 0x02ff008b
> [ 13.974777] sdhci: AC12 err: 0x00000000 | Slot int: 0x00000000
> [ 13.980602] sdhci: Caps: 0x21ed3281 | Caps_1: 0x00000000
> [ 13.986428] sdhci: Cmd: 0x0000063a | Max curr: 0x00000000
> [ 13.992252] sdhci: Host ctl2: 0x00000000
> [ 13.996166] sdhci: ADMA Err: 0x00000000 | ADMA Ptr: 0x7c048200
> [ 14.001990] sdhci: ===========================================
> [ 14.009802] mmc0: Got data interrupt 0x02000000 even though no data operation was in progress.
>
> A decent point was raised about minimising the use of a local variable that
> we 'could' do without. I've chosen consistency over the possibility of
> reducing the local variable count by 1. Thinking that it's more important
> for the code to be grouped and authoured in a similar manner/style for
> greater maintainability/readability.
>
> Cc: stable@...r.kernel.org
> Tested-by: Peter Griffin <peter.griffin@...aro.org>
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> ---
> drivers/mmc/host/sdhci-st.c | 15 ++++++++++++++-
> 1 file changed, 14 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/sdhci-st.c b/drivers/mmc/host/sdhci-st.c
> index c95ba83..ed92ce7 100644
> --- a/drivers/mmc/host/sdhci-st.c
> +++ b/drivers/mmc/host/sdhci-st.c
> @@ -28,6 +28,7 @@
>
> struct st_mmc_platform_data {
> struct reset_control *rstc;
> + struct clk *icnclk;
> void __iomem *top_ioaddr;
> };
>
> @@ -353,7 +354,7 @@ static int sdhci_st_probe(struct platform_device *pdev)
> struct sdhci_host *host;
> struct st_mmc_platform_data *pdata;
> struct sdhci_pltfm_host *pltfm_host;
> - struct clk *clk;
> + struct clk *clk, *icnclk;
> int ret = 0;
> u16 host_version;
> struct resource *res;
> @@ -365,6 +366,11 @@ static int sdhci_st_probe(struct platform_device *pdev)
> return PTR_ERR(clk);
> }
>
> + /* ICN clock isn't compulsory, but use it if it's provided. */
> + icnclk = devm_clk_get(&pdev->dev, "icn");
> + if (IS_ERR(icnclk))
> + icnclk = NULL;
> +
> rstc = devm_reset_control_get(&pdev->dev, NULL);
> if (IS_ERR(rstc))
> rstc = NULL;
> @@ -389,6 +395,7 @@ static int sdhci_st_probe(struct platform_device *pdev)
> }
>
> clk_prepare_enable(clk);
> + clk_prepare_enable(icnclk);
>
> /* Configure the FlashSS Top registers for setting eMMC TX/RX delay */
> res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> @@ -400,6 +407,7 @@ static int sdhci_st_probe(struct platform_device *pdev)
> }
>
> pltfm_host->clk = clk;
> + pdata->icnclk = icnclk;
>
> /* Configure the Arasan HC inside the flashSS */
> st_mmcss_cconfig(np, host);
> @@ -422,6 +430,7 @@ static int sdhci_st_probe(struct platform_device *pdev)
> return 0;
>
> err_out:
> + clk_disable_unprepare(icnclk);
> clk_disable_unprepare(clk);
> err_of:
> sdhci_pltfm_free(pdev);
> @@ -442,6 +451,8 @@ static int sdhci_st_remove(struct platform_device *pdev)
>
> ret = sdhci_pltfm_unregister(pdev);
>
> + clk_disable_unprepare(pdata->icnclk);
> +
> if (rstc)
> reset_control_assert(rstc);
>
> @@ -462,6 +473,7 @@ static int sdhci_st_suspend(struct device *dev)
> if (pdata->rstc)
> reset_control_assert(pdata->rstc);
>
> + clk_disable_unprepare(pdata->icnclk);
> clk_disable_unprepare(pltfm_host->clk);
> out:
> return ret;
> @@ -475,6 +487,7 @@ static int sdhci_st_resume(struct device *dev)
> struct device_node *np = dev->of_node;
>
> clk_prepare_enable(pltfm_host->clk);
> + clk_prepare_enable(pdata->icnclk);
>
> if (pdata->rstc)
> reset_control_deassert(pdata->rstc);
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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