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Commit fc625e65 authored by Mohan Pallaka's avatar Mohan Pallaka
Browse files

leds: qpnp-wled: enable VREF_UP in TEST4 register 



False ovp (over voltage protection) can be triggered
for LCD panels when the brightness is low. Avoid this
by enabling VREF_UP in TEST4 register.

Change-Id: I5c503f2c806499fd565234757fdac87367951f60
Signed-off-by: default avatarMohan Pallaka <mpallaka@codeaurora.org>
parent 8b4c2654

drivers/leds/leds-qpnp-wled.c

+15 −0
Original line number Diff line number Diff line
@@ -42,6 +42,7 @@ 
#define QPNP_WLED_SC_PRO_REG(b)		(b + 0x5E)

#define QPNP_WLED_TEST1_REG(b)		(b + 0xE2)

#define QPNP_WLED_TEST3_REG(b)		(b + 0xE4)

#define QPNP_WLED_TEST4_REG(b)		(b + 0xE5)



#define QPNP_WLED_EN_MASK		0x7F

#define QPNP_WLED_EN_SHIFT		7
@@ -73,6 +74,7 @@ 
#define QPNP_WLED_TEST3_OVP_DIS		0x1F

#define QPNP_WLED_TEST3_OVP_EN		0x3F

#define QPNP_WLED_TEST3_OVP_DLY_US	100

#define QPNP_WLED_TEST4_EN_VREF_UP	0x32



/* sink registers */

#define QPNP_WLED_CURR_SINK_REG(b)	(b + 0x46)
@@ -772,6 +774,19 @@ static int qpnp_wled_set_disp(struct qpnp_wled *wled, u16 base_addr) 
	if (rc)

		return rc;



	/* enable VREF_UP to avoid false ovp on low brightness for LCD */

	if (!wled->disp_type_amoled) {

		rc = qpnp_wled_sec_access(wled, base_addr);

		if (rc)

			return rc;



		reg = QPNP_WLED_TEST4_EN_VREF_UP;

		rc = qpnp_wled_write_reg(wled, &reg,

				QPNP_WLED_TEST4_REG(base_addr));

		if (rc)

			return rc;

	}



	return 0;

}