6.12-stable review patch. If anyone has any objections, please let me know.
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From: Leo Yan leo.yan@arm.com
[ Upstream commit 5483624effea2e893dc0df6248253a6a2a085451 ]
The atclk is an optional clock for the CoreSight CATU, but the driver misses to initialize it.
This change enables atclk in probe of the CATU driver, and dynamically control the clock during suspend and resume.
The checks for driver data and clocks in suspend and resume are not needed, remove them. Add error handling in the resume function.
Fixes: fcacb5c154ba ("coresight: Introduce support for Coresight Address Translation Unit") Reviewed-by: Anshuman Khandual anshuman.khandual@arm.com Reviewed-by: Yeoreum Yun yeoreum.yun@arm.com Tested-by: James Clark james.clark@linaro.org Signed-off-by: Leo Yan leo.yan@arm.com Signed-off-by: Suzuki K Poulose suzuki.poulose@arm.com Link: https://lore.kernel.org/r/20250731-arm_cs_fix_clock_v4-v6-2-1dfe10bb3f6f@arm... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/hwtracing/coresight/coresight-catu.c | 22 +++++++++++++++----- drivers/hwtracing/coresight/coresight-catu.h | 1 + 2 files changed, 18 insertions(+), 5 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c index 25fd02955c38d..abfff42b20c93 100644 --- a/drivers/hwtracing/coresight/coresight-catu.c +++ b/drivers/hwtracing/coresight/coresight-catu.c @@ -521,6 +521,10 @@ static int __catu_probe(struct device *dev, struct resource *res) struct coresight_platform_data *pdata = NULL; void __iomem *base;
+ drvdata->atclk = devm_clk_get_optional_enabled(dev, "atclk"); + if (IS_ERR(drvdata->atclk)) + return PTR_ERR(drvdata->atclk); + catu_desc.name = coresight_alloc_device_name(&catu_devs, dev); if (!catu_desc.name) return -ENOMEM; @@ -668,18 +672,26 @@ static int catu_runtime_suspend(struct device *dev) { struct catu_drvdata *drvdata = dev_get_drvdata(dev);
- if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk)) - clk_disable_unprepare(drvdata->pclk); + clk_disable_unprepare(drvdata->atclk); + clk_disable_unprepare(drvdata->pclk); + return 0; }
static int catu_runtime_resume(struct device *dev) { struct catu_drvdata *drvdata = dev_get_drvdata(dev); + int ret;
- if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk)) - clk_prepare_enable(drvdata->pclk); - return 0; + ret = clk_prepare_enable(drvdata->pclk); + if (ret) + return ret; + + ret = clk_prepare_enable(drvdata->atclk); + if (ret) + clk_disable_unprepare(drvdata->pclk); + + return ret; } #endif
diff --git a/drivers/hwtracing/coresight/coresight-catu.h b/drivers/hwtracing/coresight/coresight-catu.h index 755776cd19c5b..6e6b7aac206dc 100644 --- a/drivers/hwtracing/coresight/coresight-catu.h +++ b/drivers/hwtracing/coresight/coresight-catu.h @@ -62,6 +62,7 @@
struct catu_drvdata { struct clk *pclk; + struct clk *atclk; void __iomem *base; struct coresight_device *csdev; int irq;