iwlwifi: software w/a for h/w bug cause Rx bit get clear

This is a w/a for a hardware bug. the h/w bug may cause the Rx bit
(bit 15 before shifting it to 31) to clear when using interrupt coalescing.

This does not mean frames are lost - their processing is just delayed until
next interrupt arrives.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/iwlwifi/iwl-core.c b/drivers/net/wireless/iwlwifi/iwl-core.c
index 29eb7b4..9d6c144 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-core.c
+++ b/drivers/net/wireless/iwlwifi/iwl-core.c
@@ -1803,6 +1803,16 @@ irqreturn_t iwl_isr_ict(int irq, void *data)
        if (val == 0xffffffff)
                val = 0;
 
+       /*
+        * this is a w/a for a h/w bug. the h/w bug may cause the Rx bit
+        * (bit 15 before shifting it to 31) to clear when using interrupt
+        * coalescing. fortunately, bits 18 and 19 stay set when this happens
+        * so we use them to decide on the real state of the Rx bit.
+        * In order words, bit 15 is set if bit 18 or bit 19 are set.
+        */
+       if (val & 0xC0000)
+               val |= 0x8000;
+
        inta = (0xff & val) | ((0xff00 & val) << 16);
        IWL_DEBUG_ISR(priv, "ISR inta 0x%08x, enabled 0x%08x ict 0x%08x\n",
                        inta, inta_mask, val);