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[ARM] pxa: enable GPIO receivers after configuring pins 

'mach-pxa' platforms currently rely on a bootloader to setup GPIO pins
and clear RDH (to enable inputs).

A kernel loaded by a 'minimal' bootloader, that doesn't touch any pins,
will not function correctly; inputs will remain disabled, even after the
pins are configured. The following change fixes the issue and has been
verified on Gumstix Verdex XL6P and a custom PXA270 platform.

Signed-off-by: Timothy Clacy <tcl@phaseone.com>
Signed-off-by: Eric Miao <eric.miao@marvell.com>
This commit is contained in:
Timothy Clacy 2009-05-07 19:40:33 +02:00 committed by Eric Miao
parent 216e3b7abb
commit 866bd43581
1 changed files with 3 additions and 0 deletions
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3
arch/arm/mach-pxa/mfp-pxa2xx.c
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@ -377,6 +377,9 @@ static int __init pxa2xx_mfp_init(void)
if (cpu_is_pxa27x())
pxa27x_mfp_init();
/* clear RDH bit to enable GPIO receivers after reset/sleep exit */
PSSR = PSSR_RDH;
/* initialize gafr_run[], pgsr_lpm[] from existing values */
for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++)
gpdr_lpm[i] = GPDR(i * 32);