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@xxxxxxxxxxxxxxx > Tested-by: Peter Griffin <peter.griffin@xxxxxxxxxx> > Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx> > --- > 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 Follow Linaro: Facebook | Twitter | Blog -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
