summaryrefslogtreecommitdiffstats
path: root/drivers
diff options
context:
space:
mode:
authorSuzuki K Poulose <suzuki.poulose@arm.com>2020-11-27 10:52:48 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-11-27 20:23:12 +0100
commit60c519c5d3629c21ba356782434d5b612d312de4 (patch)
treec22c2e2a0cae36e6fdc646d4a112ddb5120e3fbe /drivers
parent6288b4ceca868eac4bf729532f8d845e3ecbed98 (diff)
downloadlinux-60c519c5d3629c21ba356782434d5b612d312de4.tar.bz2
coresight: etm4x: Handle TRCVIPCSSCTLR accesses
TRCVIPCSSCTLR is not present if the TRCIDR4.NUMPC > 0. Thus we should only access the register if it is present, preventing any undesired behavior. Cc: stable@vger.kernel.org Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20201127175256.1092685-8-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/hwtracing/coresight/coresight-etm4x-core.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c
index 28dd278f6d47..d78a37b6592c 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
@@ -141,8 +141,9 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
writel_relaxed(config->viiectlr, drvdata->base + TRCVIIECTLR);
writel_relaxed(config->vissctlr,
drvdata->base + TRCVISSCTLR);
- writel_relaxed(config->vipcssctlr,
- drvdata->base + TRCVIPCSSCTLR);
+ if (drvdata->nr_pe_cmp)
+ writel_relaxed(config->vipcssctlr,
+ drvdata->base + TRCVIPCSSCTLR);
for (i = 0; i < drvdata->nrseqstate - 1; i++)
writel_relaxed(config->seq_ctrl[i],
drvdata->base + TRCSEQEVRn(i));
@@ -1202,7 +1203,8 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
state->trcvictlr = readl(drvdata->base + TRCVICTLR);
state->trcviiectlr = readl(drvdata->base + TRCVIIECTLR);
state->trcvissctlr = readl(drvdata->base + TRCVISSCTLR);
- state->trcvipcssctlr = readl(drvdata->base + TRCVIPCSSCTLR);
+ if (drvdata->nr_pe_cmp)
+ state->trcvipcssctlr = readl(drvdata->base + TRCVIPCSSCTLR);
state->trcvdctlr = readl(drvdata->base + TRCVDCTLR);
state->trcvdsacctlr = readl(drvdata->base + TRCVDSACCTLR);
state->trcvdarcctlr = readl(drvdata->base + TRCVDARCCTLR);
@@ -1310,7 +1312,8 @@ static void etm4_cpu_restore(struct etmv4_drvdata *drvdata)
writel_relaxed(state->trcvictlr, drvdata->base + TRCVICTLR);
writel_relaxed(state->trcviiectlr, drvdata->base + TRCVIIECTLR);
writel_relaxed(state->trcvissctlr, drvdata->base + TRCVISSCTLR);
- writel_relaxed(state->trcvipcssctlr, drvdata->base + TRCVIPCSSCTLR);
+ if (drvdata->nr_pe_cmp)
+ writel_relaxed(state->trcvipcssctlr, drvdata->base + TRCVIPCSSCTLR);
writel_relaxed(state->trcvdctlr, drvdata->base + TRCVDCTLR);
writel_relaxed(state->trcvdsacctlr, drvdata->base + TRCVDSACCTLR);
writel_relaxed(state->trcvdarcctlr, drvdata->base + TRCVDARCCTLR);