From 500b4ac90d1103a7c302d5bb16c53f4ffc45d057 Mon Sep 17 00:00:00 2001 From: Sundar R Iyer Date: Mon, 17 May 2010 21:24:48 +0530 Subject: [PATCH] regulator: return set_mode is same mode is requested On Mon, 2010-05-17 at 17:34 +0200, Mark Brown wrote: > This doesn't seem like the right error handling - if the driver has a > set_mode() you'd *expect* it to have a get_mode() but there's no need > for it to be a strict requirement. True. In such a case, even a valid request would be lost! So now in the updated patch: - check if get_mode is present to avoid oops; - if get_mode is not present, proceed anyways for the request. Here is the updated patch: >From bad0d5eb51ef84be5b100e3dd0f5a590ea0529b6 Mon Sep 17 00:00:00 2001 From: Sundar R Iyer Date: Fri, 14 May 2010 15:14:17 +0530 Subject: [PATCH 1/1] regulator: return set_mode when same mode is requested save I/O costs by returning when the same mode is requested for the regulator Cc: Liam Girdwood Cc: Mark Brown Acked-by: Linus Walleij Signed-off-by: Sundar R Iyer Acked-by: Mark Brown Signed-off-by: Liam Girdwood --- drivers/regulator/core.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 98e5d14f94f3..2248087b9be2 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -1745,6 +1745,7 @@ int regulator_set_mode(struct regulator *regulator, unsigned int mode) { struct regulator_dev *rdev = regulator->rdev; int ret; + int regulator_curr_mode; mutex_lock(&rdev->mutex); @@ -1754,6 +1755,15 @@ int regulator_set_mode(struct regulator *regulator, unsigned int mode) goto out; } + /* return if the same mode is requested */ + if (rdev->desc->ops->get_mode) { + regulator_curr_mode = rdev->desc->ops->get_mode(rdev); + if (regulator_curr_mode == mode) { + ret = 0; + goto out; + } + } + /* constraints check */ ret = regulator_check_mode(rdev, mode); if (ret < 0) -- 2.39.5