On 04/07/2013 10:28 PM, Marek Vasut wrote:
Dear Mike Dunn,
This patch adds a config option CONFIG_SYS_LCD_PXA_NO_L_BIAS, which causes the lcd controller initialization code to leave as an ordinary gpio the line that is typically configured as the lcd L_BIAS alternate function (this is the gpio 77 line).
For some reason (I don't have a datasheet), the lcd device on the palmtreo680 board does not use the L_BIAS line. PalmOS does not configure the gpio 77 line for the L_BIAS alternate function, and if it is configured as such, the lcd does not work.
Signed-off-by: Mike Dunn mikedunn@newsguy.com
The other option would be to pull the GPIO setup from the driver. That'd be the best.
Well, there's a lot of shared code in pxafb_setup_gpio() that handles pin configuration for all possible interface widths.
But after looking at this problem some more, I realized that the board-specific lcd_enable() is called after the pxa driver's initialization, so the board code can undo the L_BIAS pin configuration. Not elegant, but better than the ugly #ifdefs.
Thanks, Mike