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Commit d5f0adb6 authored by Xiaogang Cui's avatar Xiaogang Cui Committed by Gerrit - the friendly Code Review server
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coresight: add support to force dump tmc registers during tmc_enable 



Add boolean property to force dump TMC registers during tmc_enable().
This is required for cases where TMC registers are not retained across
watchdog reset workflows.

Change-Id: I08c54f8b0b747436dec488e9421e08684f602c26
Signed-off-by: default avatarXiaogang Cui <xiaogang@codeaurora.org>
parent 819f45d3

Documentation/devicetree/bindings/coresight/coresight.txt

+2 −0
Original line number Diff line number Diff line
@@ -167,6 +167,8 @@ Optional properties: 
		    interrupts specified in the 'interrupts' property.

- qcom,sg-enable : indicates whether scatter gather feature is supported for TMC

		   ETR configuration.

- qcom,force-reg-dump : boolean, indicate whether TMC register need to be dumped.

			Used for TMC component

- qcom,nidntsw : boolean, indicating NIDnT software debug or trace support

		 present. Used for tpiu component

- qcom,nidnthw : boolean, indicating NIDnT hardware sensing support present.

drivers/coresight/coresight-tmc.c

+15 −1
Original line number Diff line number Diff line
@@ -206,6 +206,8 @@ struct tmc_drvdata { 
	char			*byte_cntr_node;

	uint32_t		mem_size;

	bool			sticky_enable;

	bool			force_reg_dump;

	bool			dump_reg;

	bool			sg_enable;

	enum tmc_etr_mem_type	mem_type;

	enum tmc_etr_mem_type	memtype;
@@ -215,6 +217,7 @@ struct tmc_drvdata { 
	struct notifier_block	jtag_save_blk;

};



static void __tmc_reg_dump(struct tmc_drvdata *drvdata);

static void tmc_wait_for_flush(struct tmc_drvdata *drvdata)

{

	int count;
@@ -909,6 +912,11 @@ static int tmc_enable(struct tmc_drvdata *drvdata, enum tmc_mode mode) 
			__tmc_etf_enable(drvdata);

	}

	drvdata->enable = true;

	if (drvdata->force_reg_dump) {

		drvdata->dump_reg = true;

		__tmc_reg_dump(drvdata);

		drvdata->dump_reg = false;

	}



	/*

	 * sticky_enable prevents users from reading tmc dev node before
@@ -951,7 +959,9 @@ static void __tmc_reg_dump(struct tmc_drvdata *drvdata) 
	char *reg_hdr;

	uint32_t *reg_buf;



	if (!drvdata->reg_buf || !drvdata->aborting)

	if (!drvdata->reg_buf)

		return;

	else if (!drvdata->aborting && !drvdata->dump_reg)

		return;



	reg_hdr = drvdata->reg_buf - PAGE_SIZE;
@@ -2379,6 +2389,10 @@ static int tmc_probe(struct platform_device *pdev) 
	if (ret)

		return ret;



	drvdata->force_reg_dump = of_property_read_bool

				  (pdev->dev.of_node,

				  "qcom,force-reg-dump");



	devid = tmc_readl(drvdata, CORESIGHT_DEVID);

	drvdata->config_type = BMVAL(devid, 6, 7);