| Message ID | 1408081268-5748-1-git-send-email-srinivas.kandagatla@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Aug 15, 2014, at 12:41 AM, Srinivas Kandagatla <srinivas.kandagatla@linaro.org> wrote: > The use case here is when we have a bootconsole which is printing the > characters on serial console and gsbi driver comes up after some time. > As gsbi driver disables the clock in probe the bootconsole locks up. > > This patch fixes the problem by disabling the clock in platform remove > rather than in probe. > > Tested-by: Linus Walleij <linus.walleij@linaro.org> > Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> > --- > Changes since RFC: > - none, just a subject line change. Srini, We need some changes to the commit message for this to get into v3.17. Probably some references to: http://www.spinics.net/lists/linux-arm-msm/msg10589.html Adding Kevin to provide details on what else should be in commit message w/regards to the regression we introduced. - k
On Tue, Sep 23, 2014 at 10:42 AM, Kumar Gala <galak@codeaurora.org> wrote: > > On Aug 15, 2014, at 12:41 AM, Srinivas Kandagatla <srinivas.kandagatla@linaro.org> wrote: > >> The use case here is when we have a bootconsole which is printing the >> characters on serial console and gsbi driver comes up after some time. >> As gsbi driver disables the clock in probe the bootconsole locks up. >> >> This patch fixes the problem by disabling the clock in platform remove >> rather than in probe. >> >> Tested-by: Linus Walleij <linus.walleij@linaro.org> >> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> >> --- >> Changes since RFC: >> - none, just a subject line change. > > Srini, > > We need some changes to the commit message for this to get into v3.17. > > Probably some references to: > > http://www.spinics.net/lists/linux-arm-msm/msg10589.html > > Adding Kevin to provide details on what else should be in commit message w/regards to the regression we introduced. At this point of the cycle, we're rather strict about what qualifies as a fix. It should be fixing a specific regression. Looking at the above link, it looks like it is, so could you re-spin this with changelog, summarizing the regression and how this fixes the regression, and we should still be able to get it in for v3.17. Also, it looks like the original was only posted to the msm list. For future reference, for patches that need to go via the arm-soc maintainers, make sure to Cc arm@kernel.org. Thanks, Kevin -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 23/09/14 18:42, Kumar Gala wrote: > > On Aug 15, 2014, at 12:41 AM, Srinivas Kandagatla <srinivas.kandagatla@linaro.org> wrote: > >> The use case here is when we have a bootconsole which is printing the >> characters on serial console and gsbi driver comes up after some time. >> As gsbi driver disables the clock in probe the bootconsole locks up. >> >> This patch fixes the problem by disabling the clock in platform remove >> rather than in probe. >> >> Tested-by: Linus Walleij <linus.walleij@linaro.org> >> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> >> --- >> Changes since RFC: >> - none, just a subject line change. > > Srini, > > We need some changes to the commit message for this to get into v3.17. > Sure.. I will send v2 with change log referring to http://www.spinics.net/lists/linux-arm-msm/msg10589.html --srini > Probably some references to: > > http://www.spinics.net/lists/linux-arm-msm/msg10589.html > > Adding Kevin to provide details on what else should be in commit message w/regards to the regression we introduced. > > - k > -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/soc/qcom/qcom_gsbi.c b/drivers/soc/qcom/qcom_gsbi.c index 447458e..7e1f120 100644 --- a/drivers/soc/qcom/qcom_gsbi.c +++ b/drivers/soc/qcom/qcom_gsbi.c @@ -22,44 +22,63 @@ #define GSBI_CTRL_REG 0x0000 #define GSBI_PROTOCOL_SHIFT 4 +struct gsbi_info { + struct clk *hclk; + u32 mode; + u32 crci; +}; + static int gsbi_probe(struct platform_device *pdev) { struct device_node *node = pdev->dev.of_node; struct resource *res; void __iomem *base; - struct clk *hclk; - u32 mode, crci = 0; + struct gsbi_info *gsbi; + + gsbi = devm_kzalloc(&pdev->dev, sizeof(*gsbi), GFP_KERNEL); + + if (!gsbi) + return -ENOMEM; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(base)) return PTR_ERR(base); - if (of_property_read_u32(node, "qcom,mode", &mode)) { + if (of_property_read_u32(node, "qcom,mode", &gsbi->mode)) { dev_err(&pdev->dev, "missing mode configuration\n"); return -EINVAL; } /* not required, so default to 0 if not present */ - of_property_read_u32(node, "qcom,crci", &crci); + of_property_read_u32(node, "qcom,crci", &gsbi->crci); - dev_info(&pdev->dev, "GSBI port protocol: %d crci: %d\n", mode, crci); + dev_info(&pdev->dev, "GSBI port protocol: %d crci: %d\n", + gsbi->mode, gsbi->crci); + gsbi->hclk = devm_clk_get(&pdev->dev, "iface"); + if (IS_ERR(gsbi->hclk)) + return PTR_ERR(gsbi->hclk); - hclk = devm_clk_get(&pdev->dev, "iface"); - if (IS_ERR(hclk)) - return PTR_ERR(hclk); + clk_prepare_enable(gsbi->hclk); - clk_prepare_enable(hclk); - - writel_relaxed((mode << GSBI_PROTOCOL_SHIFT) | crci, + writel_relaxed((gsbi->mode << GSBI_PROTOCOL_SHIFT) | gsbi->crci, base + GSBI_CTRL_REG); /* make sure the gsbi control write is not reordered */ wmb(); - clk_disable_unprepare(hclk); + platform_set_drvdata(pdev, gsbi); + + return of_platform_populate(node, NULL, NULL, &pdev->dev); +} + +static int gsbi_remove(struct platform_device *pdev) +{ + struct gsbi_info *gsbi = platform_get_drvdata(pdev); + + clk_disable_unprepare(gsbi->hclk); - return of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev); + return 0; } static const struct of_device_id gsbi_dt_match[] = { @@ -76,6 +95,7 @@ static struct platform_driver gsbi_driver = { .of_match_table = gsbi_dt_match, }, .probe = gsbi_probe, + .remove = gsbi_remove, }; module_platform_driver(gsbi_driver);