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coresight: etm3x: Deal with CLAIM tag before and after accessing HW 

This patch moves access to the CLAIM tag so that no modification to the HW
happens before and after the CLAIM operation has been carried.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathieu Poirier 2018-11-30 11:43:05 -07:00 committed by Greg Kroah-Hartman
parent 32c58c4d3b
commit 6dd4402f24
1 changed files with 5 additions and 6 deletions
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11
drivers/hwtracing/coresight/coresight-etm3x.c
View File

@ -363,15 +363,16 @@ static int etm_enable_hw(struct etm_drvdata *drvdata)
CS_UNLOCK(drvdata->base);
rc = coresight_claim_device_unlocked(drvdata->base);
if (rc)
goto done;
/* Turn engine on */
etm_clr_pwrdwn(drvdata);
/* Apply power to trace registers */
etm_set_pwrup(drvdata);
/* Make sure all registers are accessible */
etm_os_unlock(drvdata);
rc = coresight_claim_device_unlocked(drvdata->base);
if (rc)
goto done;
etm_set_prog(drvdata);
@ -422,8 +423,6 @@ static int etm_enable_hw(struct etm_drvdata *drvdata)
etm_clr_prog(drvdata);
done:
if (rc)
etm_set_pwrdwn(drvdata);
CS_LOCK(drvdata->base);
dev_dbg(drvdata->dev, "cpu: %d enable smp call done: %d\n",
@ -577,9 +576,9 @@ static void etm_disable_hw(void *info)
for (i = 0; i < drvdata->nr_cntr; i++)
config->cntr_val[i] = etm_readl(drvdata, ETMCNTVRn(i));
etm_set_pwrdwn(drvdata);
coresight_disclaim_device_unlocked(drvdata->base);
etm_set_pwrdwn(drvdata);
CS_LOCK(drvdata->base);
dev_dbg(drvdata->dev, "cpu: %d disable smp call done\n", drvdata->cpu);