diff options
| -rw-r--r-- | Documentation/devicetree/bindings/arm/coresight.txt | 2 | ||||
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-tmc.c | 9 |
2 files changed, 10 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/arm/coresight.txt b/Documentation/devicetree/bindings/arm/coresight.txt index 15ac8e8dcfdf..603d3c62e8c7 100644 --- a/Documentation/devicetree/bindings/arm/coresight.txt +++ b/Documentation/devicetree/bindings/arm/coresight.txt @@ -86,6 +86,8 @@ its hardware characteristcs. * arm,buffer-size: size of contiguous buffer space for TMC ETR (embedded trace router) + * arm,scatter-gather: boolean. Indicates that the TMC-ETR can safely + use the SG mode on this system. Example: diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c index bb57e7f57eb5..bc8fc860c473 100644 --- a/drivers/hwtracing/coresight/coresight-tmc.c +++ b/drivers/hwtracing/coresight/coresight-tmc.c @@ -12,6 +12,7 @@ #include <linux/err.h> #include <linux/fs.h> #include <linux/miscdevice.h> +#include <linux/property.h> #include <linux/uaccess.h> #include <linux/slab.h> #include <linux/dma-mapping.h> @@ -296,6 +297,12 @@ const struct attribute_group *coresight_tmc_groups[] = { NULL, }; +static inline bool tmc_etr_can_use_sg(struct tmc_drvdata *drvdata) +{ + return fwnode_property_present(drvdata->dev->fwnode, + "arm,scatter-gather"); +} + /* Detect and initialise the capabilities of a TMC ETR */ static int tmc_etr_setup_caps(struct tmc_drvdata *drvdata, u32 devid, void *dev_caps) @@ -305,7 +312,7 @@ static int tmc_etr_setup_caps(struct tmc_drvdata *drvdata, /* Set the unadvertised capabilities */ tmc_etr_init_caps(drvdata, (u32)(unsigned long)dev_caps); - if (!(devid & TMC_DEVID_NOSCAT)) + if (!(devid & TMC_DEVID_NOSCAT) && tmc_etr_can_use_sg(drvdata)) tmc_etr_set_cap(drvdata, TMC_ETR_SG); /* Check if the AXI address width is available */ |