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Subject[PATCH 5.10 20/40] coresight: etm4x: Fix accesses to TRCVMIDCTLR1
Date
From: Suzuki K Poulose <suzuki.poulose@arm.com>

commit 93dd64404cbe63b0afba371acd8db36e84b286c7 upstream.

TRCVMIDCTRL1 is only implemented only if the TRCIDR4.NUMVMIDC > 4.
We must not touch the register otherwise.

Cc: stable@vger.kernel.org
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.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/20201127175256.1092685-4-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/hwtracing/coresight/coresight-etm4x-core.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

--- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
@@ -193,7 +193,8 @@ static int etm4_enable_hw(struct etmv4_d
writeq_relaxed(config->vmid_val[i],
drvdata->base + TRCVMIDCVRn(i));
writel_relaxed(config->vmid_mask0, drvdata->base + TRCVMIDCCTLR0);
- writel_relaxed(config->vmid_mask1, drvdata->base + TRCVMIDCCTLR1);
+ if (drvdata->numvmidc > 4)
+ writel_relaxed(config->vmid_mask1, drvdata->base + TRCVMIDCCTLR1);

if (!drvdata->skip_power_up) {
/*
@@ -1243,7 +1244,8 @@ static int etm4_cpu_save(struct etmv4_dr
state->trccidcctlr1 = readl(drvdata->base + TRCCIDCCTLR1);

state->trcvmidcctlr0 = readl(drvdata->base + TRCVMIDCCTLR0);
- state->trcvmidcctlr1 = readl(drvdata->base + TRCVMIDCCTLR1);
+ if (drvdata->numvmidc > 4)
+ state->trcvmidcctlr1 = readl(drvdata->base + TRCVMIDCCTLR1);

state->trcclaimset = readl(drvdata->base + TRCCLAIMCLR);

@@ -1353,7 +1355,8 @@ static void etm4_cpu_restore(struct etmv
writel_relaxed(state->trccidcctlr1, drvdata->base + TRCCIDCCTLR1);

writel_relaxed(state->trcvmidcctlr0, drvdata->base + TRCVMIDCCTLR0);
- writel_relaxed(state->trcvmidcctlr1, drvdata->base + TRCVMIDCCTLR1);
+ if (drvdata->numvmidc > 4)
+ writel_relaxed(state->trcvmidcctlr1, drvdata->base + TRCVMIDCCTLR1);

writel_relaxed(state->trcclaimset, drvdata->base + TRCCLAIMSET);


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