iwlwifi: software w/a for h/w bug cause Rx bit get clear (2a11df6e) · Commits · 戴 / test

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>

drivers/net/wireless/iwlwifi/iwl-core.c

+10 −0

Original line number	Diff line number	Diff line
		@@ -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);

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