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Message-Id: <20120103223324.463302611@clark.kroah.org> Date: Tue, 03 Jan 2012 14:33:14 -0800 From: Greg KH <gregkh@...e.de> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: torvalds@...ux-foundation.org, akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk, Jason Chen <jason.chen@...aro.org>, Sascha Hauer <s.hauer@...gutronix.de> Subject: [41/75] ARM:imx:fix pwm period value 3.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jason Chen <jason.chen@...aro.org> commit 5776ac2eb33164c77cdb4d2b48feee15616eaba3 upstream. According to imx pwm RM, the real period value should be PERIOD value in PWMPR plus 2. PWMO (Hz) = PCLK(Hz) / (period +2) Signed-off-by: Jason Chen <jason.chen@...aro.org> Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de> --- arch/arm/plat-mxc/pwm.c | 9 +++++++++ 1 file changed, 9 insertions(+) --- a/arch/arm/plat-mxc/pwm.c +++ b/arch/arm/plat-mxc/pwm.c @@ -77,6 +77,15 @@ int pwm_config(struct pwm_device *pwm, i do_div(c, period_ns); duty_cycles = c; + /* + * according to imx pwm RM, the real period value should be + * PERIOD value in PWMPR plus 2. + */ + if (period_cycles > 2) + period_cycles -= 2; + else + period_cycles = 0; + writel(duty_cycles, pwm->mmio_base + MX3_PWMSAR); writel(period_cycles, pwm->mmio_base + MX3_PWMPR); -- 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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