From: anarsoul@gmail.com (Vasily Khoruzhick)
To: linux-arm-kernel@lists.infradead.org
Subject: Problem with s3c24xx pwm driver
Date: Thu, 24 Sep 2009 11:54:56 +0300 [thread overview]
Message-ID: <200909241155.01206.anarsoul@gmail.com> (raw)
In-Reply-To: <f17812d70909231525t594704c5u781e2221481676a0@mail.gmail.com>
? ????????? ?? 24 ???????? 2009 01:25:46 ????? Eric Miao ???????:
> No, it doesn't.
>
> So my suggestion at the moment is that you may:
>
> 1. try dump the registers after pwm_enable() and see if all are setup
> correctly,
>
> 2. and make sure those registers are write-able at that time (some
> SoC doesn't allow register writing when the controller is disabled).
>
Here's a trace with my comments, but I can't see anything wrong in this trace:
/* Configuring backlight level */
pwm_config:271: TCMPB, wrote: 0000010a, read: 0000010a <- Configure duty
pwm_config:274: TCNTB, wrote: 0000012a, read: 0000012a <- Configure period
pwm_config:281: TCON, wrote: 0051990f, read: 0051990f <- Set manual update
flag
pwm_config:286: TCON, wrote: 0051990d, read: 0051990d <- Clear manual update
flag
pwm_enable:149: TCON, wrote: 0051990d, read: 0051990d <- Enable called each
time if backlight level != 0
/* Configuring backlight level */
pwm_config:271: TCMPB, wrote: 000000a3, read: 000000a3
pwm_config:274: TCNTB, wrote: 0000012a, read: 0000012a
pwm_config:281: TCON, wrote: 0051990f, read: 0051990f
pwm_config:286: TCON, wrote: 0051990d, read: 0051990d
pwm_enable:149: TCON, wrote: 0051990d, read: 0051990d
/* Configuring backlight level */
pwm_config:271: TCMPB, wrote: 00000112, read: 00000112
pwm_config:274: TCNTB, wrote: 0000012a, read: 0000012a
pwm_config:281: TCON, wrote: 0051990f, read: 0051990f
pwm_config:286: TCON, wrote: 0051990d, read: 0051990d
pwm_enable:149: TCON, wrote: 0051990d, read: 0051990d
/* Works fine until next sequence */
/* Disabling backlight */
pwm_config:271: TCMPB, wrote: 00000129, read: 00000129
pwm_config:274: TCNTB, wrote: 0000012a, read: 0000012a
pwm_config:281: TCON, wrote: 0051990f, read: 0051990f
pwm_config:286: TCON, wrote: 0051990d, read: 0051990d
pwm_disable:170: TCON, wrote: 0051990c, read: 0051990c <- Clear start flag
/* Enabling backlight back, but it doesn't work :( */
pwm_config:271: TCMPB, wrote: 00000124, read: 00000124 <- Configure duty
pwm_config:274: TCNTB, wrote: 0000012a, read: 0000012a <- Configure period
pwm_config:281: TCON, wrote: 0051990e, read: 0051990e <- Set manual update
flag
pwm_config:286: TCON, wrote: 0051990c, read: 0051990c <- Clear manual update
flag
pwm_enable:149: TCON, wrote: 0051990d, read: 0051990d <- Set start flag
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next prev parent reply other threads:[~2009-09-24 8:54 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-23 15:24 Problem with s3c24xx pwm driver Vasily Khoruzhick
2009-09-23 19:03 ` Eric Miao
2009-09-23 19:16 ` Vasily Khoruzhick
2009-09-23 19:23 ` Vasily Khoruzhick
2009-09-23 22:25 ` Eric Miao
2009-09-24 8:54 ` Vasily Khoruzhick [this message]
2009-09-24 14:33 ` Vasily Khoruzhick
2009-09-24 20:34 ` Russell King - ARM Linux
2009-09-25 6:07 ` Vasily Khoruzhick
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