From: Mathieu Poirier <mathieu.poirier@linaro.org>
To: gregkh@linuxfoundation.org
Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH 01/15] coresight: etm4x: Skip setting LPOVERRIDE bit for qcom,skip-power-up
Date: Fri, 27 Nov 2020 10:52:42 -0700 [thread overview]
Message-ID: <20201127175256.1092685-2-mathieu.poirier@linaro.org> (raw)
In-Reply-To: <20201127175256.1092685-1-mathieu.poirier@linaro.org>
From: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
There is a bug on the systems supporting to skip power up
(qcom,skip-power-up) where setting LPOVERRIDE bit(low-power
state override behaviour) will result in CPU hangs/lockups
even on the implementations which supports it. So skip
setting the LPOVERRIDE bit for such platforms.
Cc: stable@vger.kernel.org
Fixes: 02510a5aa78d ("coresight: etm4x: Add support to skip trace unit power up")
Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
---
drivers/hwtracing/coresight/coresight-etm4x-core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c
index abd706b216ac..6096d7abf80d 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
@@ -779,7 +779,7 @@ static void etm4_init_arch_data(void *info)
* LPOVERRIDE, bit[23] implementation supports
* low-power state override
*/
- if (BMVAL(etmidr5, 23, 23))
+ if (BMVAL(etmidr5, 23, 23) && (!drvdata->skip_power_up))
drvdata->lpoverride = true;
else
drvdata->lpoverride = false;
--
2.25.1
next prev parent reply other threads:[~2020-11-27 17:53 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-27 17:52 [PATCH 00/15] coresight: Patches for v5.11 Mathieu Poirier
2020-11-27 17:52 ` Mathieu Poirier [this message]
2020-11-27 17:52 ` [PATCH 02/15] coresight: core: Remove unneeded semicolon Mathieu Poirier
2020-11-27 17:52 ` [PATCH 03/15] coresight: etm4x: Fix accesses to TRCVMIDCTLR1 Mathieu Poirier
2020-11-27 17:52 ` [PATCH 04/15] coresight: etm4x: Fix accesses to TRCCIDCTLR1 Mathieu Poirier
2020-11-27 17:52 ` [PATCH 05/15] coresight: etm4x: Update TRCIDR3.NUMPROCS handling to match v4.2 Mathieu Poirier
2020-11-27 17:52 ` [PATCH 06/15] coresight: etm4x: Fix accesses to TRCPROCSELR Mathieu Poirier
2020-11-27 17:52 ` [PATCH 07/15] coresight: etm4x: Handle TRCVIPCSSCTLR accesses Mathieu Poirier
2020-11-27 17:52 ` [PATCH 08/15] coresight: Remove unnecessary THIS_MODULE of funnel and replicator driver Mathieu Poirier
2020-11-27 17:52 ` [PATCH 09/15] coresight: tmc-etf: Fix NULL ptr dereference in tmc_enable_etf_sink_perf() Mathieu Poirier
2020-11-27 17:52 ` [PATCH 10/15] coresight: etb10: Fix possible NULL ptr dereference in etb_enable_perf() Mathieu Poirier
2020-11-27 17:52 ` [PATCH 11/15] coresight: tmc-etr: Assign boolean values to a bool variable Mathieu Poirier
2020-11-27 17:52 ` [PATCH 12/15] coresight: tmc-etr: Check if page is valid before dma_map_page() Mathieu Poirier
2020-11-27 17:52 ` [PATCH 13/15] coresight: Fix W=1 warnings in core framework Mathieu Poirier
2020-11-27 17:52 ` [PATCH 14/15] coresight-tpiu: Fix W=1 warning in TPIU driver Mathieu Poirier
2020-11-27 17:52 ` [PATCH 15/15] coresight-stm: Fix W=1 warning in STM driver Mathieu Poirier
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