[Ltib] anti-freeze imx27 pm patch

[Peter Wurmsdobler]

Hello,

In a previous post I mentioned that a imx27 ads loaded with the bsp 
release from 22 may 2007 freezes if a key is pressed while the system is 
in the suspend process (or resume which cannot be told). Freescale were 
so nice and provided a fix for this problem for the imx31, attached. 
Unfortunately, this patch cannot be applied to the imx27 kernel source 
file mxc_keyb.c, because the patch assumes an already implemented 
mxc_kpp_suspend() function which might be the case for a mx31, but is 
not for the mx27.

Well, I could download the mx31 bsp, install it, extract the kernel, 
etc, but would somebody simply have a mxc_keyb.c file to which I can 
savely apply the pach and add the new implementation of the two 
functions to the imx27 source tree. Afterwards I will be able to create 
a mx27 patch.

Regards,
peter
--
/drivers/input/keyboard/mxc_keyb.c
@@ -622,6 +622,16 @@ static irqreturn_t mxc_kpp_interrupt(int irq, void
*dev_id)
                                  */
                                 reg_val &= ~KBD_STAT_KDIE;
                                 __raw_writew(reg_val, KPSR);
+#ifdef CONFIG_PM
+                } else if (reg_val & KBD_STAT_KPKR) {
+                                reg_val &= ~KBD_STAT_KRIE;
+                                __raw_writew(reg_val, KPSR);
+#endif
                 } else {
                                 /* spurious interrupt */
                                 return IRQ_RETVAL(0);
@@ -673,9 +683,17 @@ static void mxc_kpp_close(struct input_dev *dev)
  */
 static int mxc_kpp_suspend(struct platform_device *pdev, pm_message_t
state)
 {
+                unsigned short reg_val;
+
                 del_timer(&kpp_dev.poll_timer);

                 if (device_may_wakeup(&pdev->dev)) {
+                                reg_val = __raw_readw(KPSR);
+                                if ((reg_val & KBD_STAT_KDIE) == 0) {
+                                                reg_val |= KBD_STAT_KRIE;
+                                                __raw_writew(reg_val, KPSR);
+                                }
                                 enable_irq_wake(keypad->irq);
                 } else {
                                 disable_irq(keypad->irq);