ARM: PXA2xx: MFP: fix bug with MFP_LPM_KEEP_OUTPUT

Pins that have MFP_LPM_KEEP_OUTPUT set and are configured for output
must retain the output state in low power mode.
Currently, the pin direction configuration is overrided with values
in gpdr_lpm[] array and do not obey the MFP_LPM_KEEP_OUTPUT setting.

Fix the above bug and add some documentation to clarify the
MFP_LPM_KEEP_OUTPUT setting purpose.

Reported-by: Paul Parsons <lost.distance@yahoo.com>
Signed-off-by: Igor Grinberg <grinberg@compulab.co.il>
Tested-by: Paul Parsons <lost.distance@yahoo.com>
Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>

1 files changed, 10 insertions, 2 deletions

diff --git a/arch/arm/mach-pxa/mfp-pxa2xx.c b/arch/arm/mach-pxa/mfp-pxa2xx.c
index b0a842887780..d2373d79b657 100644
--- a/arch/arm/mach-pxa/mfp-pxa2xx.c
+++ b/arch/arm/mach-pxa/mfp-pxa2xx.c
@@ -366,14 +366,22 @@ static int pxa2xx_mfp_suspend(void)
         }
 
         for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
-
                 saved_gafr[0][i] = GAFR_L(i);
                 saved_gafr[1][i] = GAFR_U(i);
                 saved_gpdr[i] = GPDR(i * 32);
                 saved_pgsr[i] = PGSR(i);
+        }
 
-                GPDR(i * 32) = gpdr_lpm[i];
+        /* set GPDR bits taking into account MFP_LPM_KEEP_OUTPUT */
+        for (i = 0; i < pxa_last_gpio; i++) {
+                if ((gpdr_lpm[gpio_to_bank(i)] & GPIO_bit(i)) ||
+                    ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
+                     (saved_gpdr[gpio_to_bank(i)] & GPIO_bit(i))))
+                        GPDR(i) |= GPIO_bit(i);
+                else
+                        GPDR(i) &= ~GPIO_bit(i);
         }
+
         return 0;
 }