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coresight: etm: Add check of trace unit power property

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Add check of trace unit power property to enable/disable that
keep the trace unit powered.

Change-Id: I66dbfee16df63480c9309092e61ee39b8b0cd6e8
Signed-off-by: Mao Jinlong <jinlmao@codeaurora.org>
Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org>
This commit is contained in:
Tingwei Zhang 2019-09-04 16:51:14 +08:00
commit 57fa8d1135
2 changed files with 25 additions and 12 deletions
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33
drivers/hwtracing/coresight/coresight-etm4x.c
View file

@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2014, The Linux Foundation. All rights reserved.
* Copyright (c) 2014, 2018 The Linux Foundation. All rights reserved.
*/
#include <linux/kernel.h>
@ -20,6 +20,7 @@
#include <linux/cpu.h>
#include <linux/coresight.h>
#include <linux/coresight-pmu.h>
#include <linux/of.h>
#include <linux/pm_wakeup.h>
#include <linux/amba/bus.h>
#include <linux/seq_file.h>
@ -173,12 +174,14 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
writel_relaxed(config->vmid_mask0, drvdata->base + TRCVMIDCCTLR0);
writel_relaxed(config->vmid_mask1, drvdata->base + TRCVMIDCCTLR1);
/*
* Request to keep the trace unit powered and also
* emulation of powerdown
*/
writel_relaxed(readl_relaxed(drvdata->base + TRCPDCR) | TRCPDCR_PU,
drvdata->base + TRCPDCR);
if (!drvdata->tupwr_disable) {
/*
* Request to keep the trace unit powered and also
* emulation of powerdown
*/
writel_relaxed(readl_relaxed(drvdata->base + TRCPDCR)
| TRCPDCR_PU, drvdata->base + TRCPDCR);
}
/* Enable the trace unit */
writel_relaxed(1, drvdata->base + TRCPRGCTLR);
@ -443,10 +446,12 @@ static void etm4_disable_hw(void *info)
CS_UNLOCK(drvdata->base);
/* power can be removed from the trace unit now */
control = readl_relaxed(drvdata->base + TRCPDCR);
control &= ~TRCPDCR_PU;
writel_relaxed(control, drvdata->base + TRCPDCR);
if (!drvdata->tupwr_disable) {
/* power can be removed from the trace unit now */
control = readl_relaxed(drvdata->base + TRCPDCR);
control &= ~TRCPDCR_PU;
writel_relaxed(control, drvdata->base + TRCPDCR);
}
control = readl_relaxed(drvdata->base + TRCPRGCTLR);
@ -1166,6 +1171,12 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
dev_info(&drvdata->csdev->dev, "CPU%d: ETM v%d.%d initialized\n",
drvdata->cpu, drvdata->arch >> 4, drvdata->arch & 0xf);
drvdata->tupwr_disable = of_property_read_bool(dev->of_node,
"qcom,tupwr-disable");
dev_info(dev, "CPU%d: %s initialized\n",
drvdata->cpu, (char *)id->data);
if (boot_enable) {
coresight_enable(drvdata->csdev);
drvdata->boot_enable = true;

4
drivers/hwtracing/coresight/coresight-etm4x.h
View file

@ -1,6 +1,6 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
* Copyright (c) 2014-2016, 2018 The Linux Foundation. All rights reserved.
*/
#ifndef _CORESIGHT_CORESIGHT_ETM_H
@ -335,6 +335,7 @@ struct etmv4_config {
* @nooverflow: Indicate if overflow prevention is supported.
* @atbtrig: If the implementation can support ATB triggers
* @lpoverride: If the implementation can support low-power state over.
* @tupwr_disable: If disable the support of keeping trace unit powered.
* @config: structure holding configuration parameters.
*/
struct etmv4_drvdata {
@ -380,6 +381,7 @@ struct etmv4_drvdata {
bool nooverflow;
bool atbtrig;
bool lpoverride;
bool tupwr_disable;
struct etmv4_config config;
};