The FUSE controller is enabled at a boot time. Reset it in order to put hardware and clock into clean and disabled state.
Reviewed-by: Ulf Hansson ulf.hansson@linaro.org Signed-off-by: Dmitry Osipenko digetx@gmail.com --- drivers/soc/tegra/fuse/fuse-tegra.c | 25 +++++++++++++++++++++++++ drivers/soc/tegra/fuse/fuse.h | 1 + 2 files changed, 26 insertions(+)
diff --git a/drivers/soc/tegra/fuse/fuse-tegra.c b/drivers/soc/tegra/fuse/fuse-tegra.c index f2151815db58..cc032729a143 100644 --- a/drivers/soc/tegra/fuse/fuse-tegra.c +++ b/drivers/soc/tegra/fuse/fuse-tegra.c @@ -14,6 +14,7 @@ #include <linux/of_address.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> +#include <linux/reset.h> #include <linux/slab.h> #include <linux/sys_soc.h>
@@ -243,6 +244,30 @@ static int tegra_fuse_probe(struct platform_device *pdev) goto restore; }
+ fuse->rst = devm_reset_control_get_optional(&pdev->dev, "fuse"); + if (IS_ERR(fuse->rst)) { + err = PTR_ERR(fuse->rst); + dev_err(&pdev->dev, "failed to get FUSE reset: %pe\n", + fuse->rst); + goto restore; + } + + /* + * FUSE clock is enabled at a boot time, hence this resume/suspend + * disables the clock besides the h/w resetting. + */ + err = pm_runtime_resume_and_get(&pdev->dev); + if (err) + goto restore; + + err = reset_control_reset(fuse->rst); + pm_runtime_put(&pdev->dev); + + if (err < 0) { + dev_err(&pdev->dev, "failed to reset FUSE: %d\n", err); + goto restore; + } + /* release the early I/O memory mapping */ iounmap(base);
diff --git a/drivers/soc/tegra/fuse/fuse.h b/drivers/soc/tegra/fuse/fuse.h index de58feba0435..1b719d85bd04 100644 --- a/drivers/soc/tegra/fuse/fuse.h +++ b/drivers/soc/tegra/fuse/fuse.h @@ -43,6 +43,7 @@ struct tegra_fuse { void __iomem *base; phys_addr_t phys; struct clk *clk; + struct reset_control *rst;
u32 (*read_early)(struct tegra_fuse *fuse, unsigned int offset); u32 (*read)(struct tegra_fuse *fuse, unsigned int offset);