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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>
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@ -377,6 +377,9 @@ static int __init pxa2xx_mfp_init(void)
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if (cpu_is_pxa27x())
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pxa27x_mfp_init();
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/* clear RDH bit to enable GPIO receivers after reset/sleep exit */
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PSSR = PSSR_RDH;
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/* initialize gafr_run[], pgsr_lpm[] from existing values */
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for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++)
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gpdr_lpm[i] = GPDR(i * 32);
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