From: Guru Das Srinagesh <gurus@codeaurora.org>
To: linux-pwm@vger.kernel.org,
"Thierry Reding" <thierry.reding@gmail.com>,
"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Cc: Subbaraman Narayanamurthy <subbaram@codeaurora.org>,
David Collins <collinsd@codeaurora.org>,
linux-kernel@vger.kernel.org, Joe Perches <joe@perches.com>,
Stephen Boyd <sboyd@kernel.org>, Lee Jones <lee.jones@linaro.org>,
Arnd Bergmann <arnd@arndb.de>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Guenter Roeck <linux@roeck-us.net>,
Daniel Thompson <daniel.thompson@linaro.org>,
Dan Carpenter <dan.carpenter@oracle.com>,
linux-arm-kernel@lists.infradead.org,
Guru Das Srinagesh <gurus@codeaurora.org>
Subject: [PATCH v16 09/11] backlight: pwm_bl: Use 64-bit division function
Date: Tue, 2 Jun 2020 15:31:14 -0700 [thread overview]
Message-ID: <0ba6e042fc207c1b0b7dfe3a86d8971240faace1.1591136989.git.gurus@codeaurora.org> (raw)
In-Reply-To: <cover.1591136989.git.gurus@codeaurora.org>
In-Reply-To: <cover.1591136989.git.gurus@codeaurora.org>
Since the PWM framework is switching struct pwm_state.period's datatype
to u64, prepare for this transition by using div_u64 to handle a 64-bit
dividend instead of a straight division operation.
Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
---
drivers/video/backlight/pwm_bl.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index 82b8d75..464baad 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -606,7 +606,8 @@ static int pwm_backlight_probe(struct platform_device *pdev)
pb->scale = data->max_brightness;
}
- pb->lth_brightness = data->lth_brightness * (state.period / pb->scale);
+ pb->lth_brightness = data->lth_brightness * (div_u64(state.period,
+ pb->scale));
props.type = BACKLIGHT_RAW;
props.max_brightness = data->max_brightness;
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
next prev parent reply other threads:[~2020-06-02 22:31 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-02 22:31 [PATCH v16 00/11] Convert PWM period and duty cycle to u64 Guru Das Srinagesh
2020-06-02 22:31 ` [PATCH v16 01/11] drm/i915: Use 64-bit division macro Guru Das Srinagesh
2020-06-02 22:31 ` [PATCH v16 02/11] hwmon: pwm-fan: " Guru Das Srinagesh
2020-06-02 22:31 ` [PATCH v16 03/11] ir-rx51: " Guru Das Srinagesh
2020-06-02 22:31 ` [PATCH v16 04/11] pwm: clps711x: " Guru Das Srinagesh
2020-06-02 22:31 ` [PATCH v16 05/11] pwm: pwm-imx-tpm: " Guru Das Srinagesh
2020-06-02 22:31 ` [PATCH v16 06/11] pwm: imx27: Use 64-bit division macro and function Guru Das Srinagesh
2020-07-02 7:11 ` Uwe Kleine-König
[not found] ` <cover.1591135774.git.gurus@codeaurora.org>
2020-06-02 22:31 ` [PATCH v16 06/11] pwm: imx27: Use 64-bit division macro Guru Das Srinagesh
2020-06-02 22:34 ` Guru Das Srinagesh
2020-06-02 22:31 ` [PATCH v16 07/11] pwm: sifive: " Guru Das Srinagesh
2020-06-02 22:31 ` [PATCH v16 08/11] pwm: sun4i: Use nsecs_to_jiffies to avoid a division Guru Das Srinagesh
2020-06-02 22:31 ` Guru Das Srinagesh [this message]
2020-06-02 22:31 ` [PATCH v16 10/11] clk: pwm: Use 64-bit division function Guru Das Srinagesh
2020-06-02 22:31 ` [PATCH v16 11/11] pwm: core: Convert period and duty cycle to u64 Guru Das Srinagesh
2020-06-11 16:55 ` [PATCH v16 00/11] Convert PWM " Guru Das Srinagesh
2020-06-11 17:57 ` Lee Jones
2020-06-11 18:24 ` Thierry Reding
2020-06-11 18:31 ` Guru Das Srinagesh
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