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Commit 6b630baa authored by Satyajit Desai's avatar Satyajit Desai
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coresight-tmc: Avoid reading TMC buffer before enabling 



Add sticky enable flag to avoid reading TMC buffer before
enabling TMC at least once.

Change-Id: Id1c04101d65923c266242370f725ea611b0ac846
Signed-off-by: default avatarSatyajit Desai <sadesai@codeaurora.org>
parent deda3be7

drivers/hwtracing/coresight/coresight-tmc.c

+4 −0
Original line number Diff line number Diff line
@@ -64,6 +64,7 @@ void tmc_flush_and_stop(struct tmc_drvdata *drvdata) 
void tmc_enable_hw(struct tmc_drvdata *drvdata)

{

	drvdata->enable = true;

	drvdata->sticky_enable = true;

	writel_relaxed(TMC_CTL_CAPT_EN, drvdata->base + TMC_CTL);

}
@@ -77,6 +78,9 @@ static int tmc_read_prepare(struct tmc_drvdata *drvdata) 
{

	int ret = 0;



	if (!drvdata->sticky_enable)

		return -EPERM;



	switch (drvdata->config_type) {

	case TMC_CONFIG_TYPE_ETB:

	case TMC_CONFIG_TYPE_ETF:

drivers/hwtracing/coresight/coresight-tmc.h

+1 −0
Original line number Diff line number Diff line
@@ -183,6 +183,7 @@ struct tmc_drvdata { 
	struct usb_qdss_ch	*usbch;

	struct tmc_etr_bam_data	*bamdata;

	bool			enable_to_bam;

	bool			sticky_enable;



};