From: Guru Das Srinagesh <gurus@codeaurora.org>
To: linux-pwm@vger.kernel.org
Cc: "Guru Das Srinagesh" <gurus@codeaurora.org>,
"Daniel Thompson" <daniel.thompson@linaro.org>,
"Uwe Kleine-König" <uwe@kleine-koenig.org>,
"Bartlomiej Zolnierkiewicz" <b.zolnierkie@samsung.com>,
"Jingoo Han" <jingoohan1@gmail.com>,
linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
"Thierry Reding" <thierry.reding@gmail.com>,
linux-fbdev@vger.kernel.org,
"Subbaraman Narayanamurthy" <subbaram@codeaurora.org>,
"Lee Jones" <lee.jones@linaro.org>
Subject: [PATCH v10 10/12] backlight: pwm_bl: Use 64-bit division function
Date: Thu, 19 Mar 2020 13:50:13 -0700 [thread overview]
Message-ID: <3790b021beaa6b780636bfbcd47ca30f02eacef5.1584650604.git.gurus@codeaurora.org> (raw)
In-Reply-To: <cover.1584650604.git.gurus@codeaurora.org>
In-Reply-To: <cover.1584650604.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.
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: linux-pwm@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-fbdev@vger.kernel.org
Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.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 efb4efc..3e5dbcf 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -625,7 +625,8 @@ 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
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next prev parent reply other threads:[~2020-03-20 8:01 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-19 20:50 [PATCH v10 00/12] Convert PWM period and duty cycle to u64 Guru Das Srinagesh
2020-03-19 20:50 ` [PATCH v10 01/12] drm/i915: Use 64-bit division macro Guru Das Srinagesh
2020-03-19 20:50 ` Guru Das Srinagesh [this message]
2020-03-21 11:47 ` [PATCH v10 00/12] Convert PWM period and duty cycle to u64 Dan Carpenter
2020-03-30 19:15 ` Guru Das Srinagesh
2020-03-30 20:26 ` Daniel Thompson
2020-03-30 21:00 ` Guru Das Srinagesh
2020-03-31 13:48 ` Daniel Thompson
2020-03-31 19:59 ` Guru Das Srinagesh
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