linux-kernel - [PATCH v2 04/10] backlight: pwm_bl: remove useless call to pwm_set

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Message-Id: <1437406327-6207-5-git-send-email-boris.brezillon@free-electrons.com>
Date:	Mon, 20 Jul 2015 17:32:01 +0200
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Thierry Reding <thierry.reding@...il.com>,
	linux-pwm@...r.kernel.org
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Jacek Anaszewski <j.anaszewski@...sung.com>,
	linux-leds@...r.kernel.org, Heiko Stuebner <heiko@...ech.de>,
	linux-rockchip@...ts.infradead.org,
	Jingoo Han <jingoohan1@...il.com>,
	Lee Jones <lee.jones@...aro.org>, linux-fbdev@...r.kernel.org,
	Mark Brown <broonie@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Doug Anderson <dianders@...gle.com>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>
Subject: [PATCH v2 04/10] backlight: pwm_bl: remove useless call to pwm_set_period

The PWM period will be set when calling pwm_config. Remove this useless
call to pwm_set_period, which might mess up with the initial PWM state
once we have added proper support for PWM init state retrieval.

Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
---
 drivers/video/backlight/pwm_bl.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index ae498c1..71944f8 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -293,12 +293,14 @@ static int pwm_backlight_probe(struct platform_device *pdev)
 	 * period, parsed from the DT, in the PWM device. For the non-DT case,
 	 * set the period from platform data if it has not already been set
 	 * via the PWM lookup table.
+	 * FIXME: This assignment should be dropped as soon as all the boards
+	 * have moved to the PWM lookup table approach. The same goes for the
+	 * pb->period field which should be replaced by
+	 * pwm_get_default_period() calls.
 	 */
 	pb->period = pwm_get_default_period(pb->pwm);
-	if (!pb->period && (data->pwm_period_ns > 0)) {
+	if (!pb->period && (data->pwm_period_ns > 0))
 		pb->period = data->pwm_period_ns;
-		pwm_set_period(pb->pwm, data->pwm_period_ns);
-	}
 
 	pb->lth_brightness = data->lth_brightness * (pb->period / pb->scale);
 
-- 
1.9.1

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