Bug 12753 – Implement the low-power LCD brightness pin in the backlight kernel driver

Bug 12753 - Implement the low-power LCD brightness pin in the backlight kernel driver

Summary:

Implement the low-power LCD brightness pin in the backlight kernel driver

Status:	CLOSED FIXED

Product:	SB Radio
Classification:	Unclassified
Component:	OS/Bootloader
Version:	Include FW version in comment
Platform:	PC Other

Importance:	P1 normal (vote)
Target Milestone:	7.4.0
Assigned To:	Caleb Crome

URL:
Keywords:

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2009-07-09 05:48 UTC by Caleb Crome
Modified:	2009-09-08 09:18 UTC (History)
CC List:	0 users

See Also:
Category:	---

Attachments
Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.

Description Caleb Crome 2009-07-09 05:48:08 UTC

Hey Riochard.  Can you implement the LCD_BACKLIGHT_LP bit in the backlight driver?  When driven high, it will put the LCD into low power mode.  

PA5 and later should behave better in this regard.  Earlier boards may not have reliable brightness in the low power mode, but PA5 and later should.

It would be good to do this for MP, but could wait for PLD if necessary.

-C

Comment 1 Caleb Crome 2009-07-09 05:48:39 UTC

Oops, the bit is on pin D11.

Comment 2 SVN Bot 2009-08-19 14:57:36 UTC

 == Auto-comment from SVN commit #7163 to the jive repo by richard ==
 == https://svn.slimdevices.com/jive?view=revision&revision=7163 ==

Bug #12753
Implement D11 low power brightness pin, so Caleb get some quality sleep :).

Comment 3 Richard Titmuss 2009-08-19 14:58:44 UTC

Use on/dim/off:

# echo "0" > /sys/devices/platform/mxc_lcdc_bl.0/backlight\:mxc_lcdc_bl.0/bl_pow
er
# echo "1" > /sys/devices/platform/mxc_lcdc_bl.0/backlight\:mxc_lcdc_bl.0/bl_pow
er
# echo "4" > /sys/devices/platform/mxc_lcdc_bl.0/backlight\:mxc_lcdc_bl.0/bl_pow
er

Comment 4 Caleb Crome 2009-08-19 22:49:31 UTC

Nice.  Works like a charm.