From 3c781190d11ca44752562867d76ccfb8d0a45ac3 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Sun, 11 Jan 2015 19:43:56 +0100 Subject: [PATCH] sunxi: axp221: Protect axp221_init against multiple calls The voltage setting code knows it needs to call axp221_init before calling the various voltage setting functions. But users of axp utility functions like axp221_get_sid() do not know this, so the utility functions always call axp221_init() to ensure that the p2wi / rsb setup magic has been done. Since doing this repeatedly is quite expensive, add a check to axp221_init so that it only does the initialization once. Signed-off-by: Hans de Goede Acked-by: Ian Campbell --- drivers/power/axp221.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/power/axp221.c b/drivers/power/axp221.c index 1fda19ac01..728727b48e 100644 --- a/drivers/power/axp221.c +++ b/drivers/power/axp221.c @@ -304,9 +304,14 @@ int axp221_set_aldo3(unsigned int mvolt) int axp221_init(void) { + /* This cannot be 0 because it is used in SPL before BSS is ready */ + static int needs_init = 1; u8 axp_chip_id; int ret; + if (!needs_init) + return 0; + ret = pmic_bus_init(); if (ret) return ret; @@ -318,6 +323,7 @@ int axp221_init(void) if (!(axp_chip_id == 0x6 || axp_chip_id == 0x7 || axp_chip_id == 0x17)) return -ENODEV; + needs_init = 0; return 0; } -- 2.39.5