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| author | Hans de Goede <hdegoede@redhat.com> | 2015-01-11 19:43:56 +0100 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2015-01-14 14:56:40 +0100 |
| commit | 3c781190d11ca44752562867d76ccfb8d0a45ac3 (patch) | |
| tree | 3e3050046c066b150489eb43413bddeeea6c704b | |
| parent | 52755b12e30e45501ccea9260d47a2b6aba12a91 (diff) | |
| download | u-boot-imx-3c781190d11ca44752562867d76ccfb8d0a45ac3.zip u-boot-imx-3c781190d11ca44752562867d76ccfb8d0a45ac3.tar.gz u-boot-imx-3c781190d11ca44752562867d76ccfb8d0a45ac3.tar.bz2 | |
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 <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
| -rw-r--r-- | drivers/power/axp221.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/power/axp221.c b/drivers/power/axp221.c index 1fda19a..728727b 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; } |