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Commit bcea8d72 authored by Junjie Wu's avatar Junjie Wu
Browse files

PM / devfreq: m4m-hwmon: Fix counter limit calculation 



M4M counters are only 28-bit instead of 32-bit. Fix limit calculation
to use the right max value.

Change-Id: I91078842b72da80f6b6755bf8d808ff4b4142f10
Signed-off-by: default avatarJunjie Wu <junjiew@codeaurora.org>
parent 57330bc4

drivers/devfreq/m4m-hwmon.c

+9 −2
Original line number Diff line number Diff line
@@ -50,6 +50,9 @@ 
#define CYC_CNTR_IDX		0

#define WASTED_CYC_CNTR_IDX	1



/* counter is 28-bit */

#define CNT_MAX 0x0FFFFFFFU



struct m4m_counter {

	int idx;

	u32 event_mask;
@@ -144,7 +147,7 @@ static unsigned long _mon_get_count(struct m4m_hwmon *m, 
	}



	if (ov)

		cnt = U32_MAX - start + cur_cnt;

		cnt = CNT_MAX - start + cur_cnt;

	else

		cnt = cur_cnt - start;
@@ -160,7 +163,11 @@ static unsigned long mon_get_count(struct m4m_hwmon *m, 
static inline void mon_set_limit(struct m4m_hwmon *m, enum request_group grp,

			  unsigned int limit)

{

	u32 start = U32_MAX - limit;

	u32 start;



	if (limit >= CNT_MAX)

		limit = CNT_MAX;

	start = CNT_MAX - limit;



	writel_relaxed(start, EVCNTR(m, m->cntr[grp].idx));

	m->cntr[grp].last_start = start;