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authorMathieu Poirier <mathieu.poirier@linaro.org>2015-01-10 00:57:17 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-01-12 14:04:13 +0100
commitb2c09284bbfe36f9ba0e3e8bec8bb3c4789b3911 (patch)
treeaf7f949c2915fe10024b05ccef68d198650219d2 /drivers/coresight
parentcoresight-tpiu: use module_amba_driver to simplify the code (diff)
downloadlinux-b2c09284bbfe36f9ba0e3e8bec8bb3c4789b3911.tar.xz
linux-b2c09284bbfe36f9ba0e3e8bec8bb3c4789b3911.zip
coresight-etm: Fix initial trace ID value
The coresight TRM specify that a component's trace ID should be other than 0. Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/coresight')
-rw-r--r--drivers/coresight/coresight-etm3x.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/coresight/coresight-etm3x.c b/drivers/coresight/coresight-etm3x.c
index 369cac00afaa..73c36696f1b6 100644
--- a/drivers/coresight/coresight-etm3x.c
+++ b/drivers/coresight/coresight-etm3x.c
@@ -1749,7 +1749,11 @@ static void etm_init_arch_data(void *info)
static void etm_init_default_data(struct etm_drvdata *drvdata)
{
- static int etm3x_traceid;
+ /*
+ * A trace ID of value 0 is invalid, so let's start at some
+ * random value that fits in 7 bits and will be just as good.
+ */
+ static int etm3x_traceid = 0x10;
u32 flags = (1 << 0 | /* instruction execute*/
3 << 3 | /* ARM instruction */