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Commit 866bd435 authored by Timothy Clacy's avatar Timothy Clacy Committed by Eric Miao
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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: default avatarTimothy Clacy <tcl@phaseone.com>
Signed-off-by: default avatarEric Miao <eric.miao@marvell.com>
parent 216e3b7a

arch/arm/mach-pxa/mfp-pxa2xx.c

+3 −0
Original line number Diff line number Diff line
@@ -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);