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Commit bccf0798 authored by Ke Liu's avatar Ke Liu
Browse files

msm: cpr-regulator: add dummy read to bypass false register value 



There is an issue in certain CPR HW, which requires ignoring the
first read of IRQ_STATUS register in ISR.

CRs-Fixed: 570495
Change-Id: Ib1a57a3da3c60ffb5af3669947a4eb09dbb8c255
Signed-off-by: default avatarKe Liu <keliu@codeaurora.org>
parent 7b6446cc

arch/arm/mach-msm/cpr-regulator.c

+12 −0
Original line number Diff line number Diff line
@@ -34,6 +34,10 @@ 


/* Register Offsets for RB-CPR and Bit Definitions */



/* RBCPR Version Register */

#define REG_RBCPR_VERSION		0

#define RBCPR_VER_2			0x02



/* RBCPR Gate Count and Target Registers */

#define REG_RBCPR_GCNT_TARGET(n)	(0x60 + 4 * n)
@@ -138,6 +142,7 @@ 


#define BYTES_PER_FUSE_ROW		8



#define FLAGS_IGNORE_1ST_IRQ_STATUS	BIT(0)

#define FLAGS_SET_MIN_VOLTAGE		BIT(1)



enum voltage_change_dir {
@@ -674,6 +679,9 @@ static irqreturn_t cpr_irq_handler(int irq, void *dev) 
	mutex_lock(&cpr_vreg->cpr_mutex);



	reg_val = cpr_read(cpr_vreg, REG_RBIF_IRQ_STATUS);

	if (cpr_vreg->flags & FLAGS_IGNORE_1ST_IRQ_STATUS)

		reg_val = cpr_read(cpr_vreg, REG_RBIF_IRQ_STATUS);



	cpr_debug_irq("IRQ_STATUS = 0x%02X\n", reg_val);



	if (!cpr_is_allowed(cpr_vreg)) {
@@ -967,6 +975,10 @@ static int cpr_config(struct cpr_regulator *cpr_vreg) 


	cpr_irq_set(cpr_vreg, CPR_INT_DEFAULT);



	val = cpr_read(cpr_vreg, REG_RBCPR_VERSION);

	if (val <= RBCPR_VER_2)

		cpr_vreg->flags |= FLAGS_IGNORE_1ST_IRQ_STATUS;



	cpr_corner_save(cpr_vreg, CPR_CORNER_SVS);

	cpr_corner_save(cpr_vreg, CPR_CORNER_NORMAL);

	cpr_corner_save(cpr_vreg, CPR_CORNER_TURBO);