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Message-Id: <1309159583-11339-1-git-send-email-bigeasy@linutronix.de> Date: Mon, 27 Jun 2011 09:26:22 +0200 From: Sebastian Andrzej Siewior <bigeasy@...utronix.de> To: Grant Likely <grant.likely@...retlab.ca> Cc: linux-kernel@...r.kernel.org, sodaville@...utronix.de Subject: [PATCH 1/2] gpio/gpio-generic: read set register for caching if available The ->data is a shadow copy which is used during the ->set callback in order to avoid a read of the register before write. If ->reg_set is set then we write to this location therefore we should cache that value. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de> --- drivers/gpio/gpio-generic.c | 5 ++++- 1 files changed, 4 insertions(+), 1 deletions(-) diff --git a/drivers/gpio/gpio-generic.c b/drivers/gpio/gpio-generic.c index 231714d..9f8b5c6 100644 --- a/drivers/gpio/gpio-generic.c +++ b/drivers/gpio/gpio-generic.c @@ -398,7 +398,10 @@ int __devinit bgpio_init(struct bgpio_chip *bgc, if (ret) return ret; - bgc->data = bgc->read_reg(bgc->reg_dat); + if (bgc->reg_set) + bgc->data = bgc->read_reg(bgc->reg_set); + else + bgc->data = bgc->read_reg(bgc->reg_dat); return ret; } -- 1.7.4.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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