svn commit: r313416 - head/sys/dev/iwm

[Adrian Chadd]

Author: adrian
Date: Wed Feb  8 06:54:08 2017
New Revision: 313416
URL: https://svnweb.freebsd.org/changeset/base/313416

Log:
  [iwm] Only for family 7000 power-down busmaster DMA clocks when stopping.
  
  Taken-From: Linux iwlwifi
  
  Obtained from:	DragonflyBSD commit 4c45994fcc77373ae2fb0901db15368c9731f641

Modified:
  head/sys/dev/iwm/if_iwm.c

Modified: head/sys/dev/iwm/if_iwm.c
==============================================================================
--- head/sys/dev/iwm/if_iwm.c	Wed Feb  8 06:53:23 2017	(r313415)
+++ head/sys/dev/iwm/if_iwm.c	Wed Feb  8 06:54:08 2017	(r313416)
@@ -1401,11 +1401,12 @@ iwm_stop_device(struct iwm_softc *sc)
 	for (qid = 0; qid < nitems(sc->txq); qid++)
 		iwm_reset_tx_ring(sc, &sc->txq[qid]);
 
-	/*
-	 * Power-down device's busmaster DMA clocks
-	 */
-	iwm_write_prph(sc, IWM_APMG_CLK_DIS_REG, IWM_APMG_CLK_VAL_DMA_CLK_RQT);
-	DELAY(5);
+	if (sc->cfg->device_family == IWM_DEVICE_FAMILY_7000) {
+		/* Power-down device's busmaster DMA clocks */
+		iwm_write_prph(sc, IWM_APMG_CLK_DIS_REG,
+		    IWM_APMG_CLK_VAL_DMA_CLK_RQT);
+		DELAY(5);
+	}
 
 	/* Make sure (redundant) we've released our request to stay awake */
 	IWM_CLRBITS(sc, IWM_CSR_GP_CNTRL,