linux-kernel - [ 28/42] ssb: implement spurious tone avoidance

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Date:	Tue, 23 Apr 2013 14:52:26 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Stefan Brüns <stefan.bruens@...h-aachen.de>,
	Rafał Miłecki <zajec5@...il.com>,
	"John W. Linville" <linville@...driver.com>
Subject: [ 28/42] ssb: implement spurious tone avoidance

3.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Rafał Miłecki <zajec5@...il.com>

commit 46fc4c909339f5a84d1679045297d9d2fb596987 upstream.

And make use of it in b43. This fixes a regression introduced with
49d55cef5b1925a5c1efb6aaddaa40fc7c693335
b43: N-PHY: implement spurious tone avoidance
This commit made BCM4322 use only MCS 0 on channel 13, which of course
resulted in performance drop (down to 0.7Mb/s).

Reported-by: Stefan Brüns <stefan.bruens@...h-aachen.de>
Signed-off-by: Rafał Miłecki <zajec5@...il.com>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/b43/phy_n.c          |    3 ++-
 drivers/ssb/driver_chipcommon_pmu.c       |   29 +++++++++++++++++++++++++++++
 include/linux/ssb/ssb_driver_chipcommon.h |    2 ++
 3 files changed, 33 insertions(+), 1 deletion(-)

--- a/drivers/net/wireless/b43/phy_n.c
+++ b/drivers/net/wireless/b43/phy_n.c
@@ -5165,7 +5165,8 @@ static void b43_nphy_pmu_spur_avoid(stru
 #endif
 #ifdef CONFIG_B43_SSB
 	case B43_BUS_SSB:
-		/* FIXME */
+		ssb_pmu_spuravoid_pllupdate(&dev->dev->sdev->bus->chipco,
+					    avoid);
 		break;
 #endif
 	}
--- a/drivers/ssb/driver_chipcommon_pmu.c
+++ b/drivers/ssb/driver_chipcommon_pmu.c
@@ -675,3 +675,32 @@ u32 ssb_pmu_get_controlclock(struct ssb_
 		return 0;
 	}
 }
+
+void ssb_pmu_spuravoid_pllupdate(struct ssb_chipcommon *cc, int spuravoid)
+{
+	u32 pmu_ctl = 0;
+
+	switch (cc->dev->bus->chip_id) {
+	case 0x4322:
+		ssb_chipco_pll_write(cc, SSB_PMU1_PLLCTL0, 0x11100070);
+		ssb_chipco_pll_write(cc, SSB_PMU1_PLLCTL1, 0x1014140a);
+		ssb_chipco_pll_write(cc, SSB_PMU1_PLLCTL5, 0x88888854);
+		if (spuravoid == 1)
+			ssb_chipco_pll_write(cc, SSB_PMU1_PLLCTL2, 0x05201828);
+		else
+			ssb_chipco_pll_write(cc, SSB_PMU1_PLLCTL2, 0x05001828);
+		pmu_ctl = SSB_CHIPCO_PMU_CTL_PLL_UPD;
+		break;
+	case 43222:
+		/* TODO: BCM43222 requires updating PLLs too */
+		return;
+	default:
+		ssb_printk(KERN_ERR PFX
+			   "Unknown spuravoidance settings for chip 0x%04X, not changing PLL\n",
+			   cc->dev->bus->chip_id);
+		return;
+	}
+
+	chipco_set32(cc, SSB_CHIPCO_PMU_CTL, pmu_ctl);
+}
+EXPORT_SYMBOL_GPL(ssb_pmu_spuravoid_pllupdate);
--- a/include/linux/ssb/ssb_driver_chipcommon.h
+++ b/include/linux/ssb/ssb_driver_chipcommon.h
@@ -219,6 +219,7 @@
 #define SSB_CHIPCO_PMU_CTL			0x0600 /* PMU control */
 #define  SSB_CHIPCO_PMU_CTL_ILP_DIV		0xFFFF0000 /* ILP div mask */
 #define  SSB_CHIPCO_PMU_CTL_ILP_DIV_SHIFT	16
+#define  SSB_CHIPCO_PMU_CTL_PLL_UPD		0x00000400
 #define  SSB_CHIPCO_PMU_CTL_NOILPONW		0x00000200 /* No ILP on wait */
 #define  SSB_CHIPCO_PMU_CTL_HTREQEN		0x00000100 /* HT req enable */
 #define  SSB_CHIPCO_PMU_CTL_ALPREQEN		0x00000080 /* ALP req enable */
@@ -667,5 +668,6 @@ enum ssb_pmu_ldo_volt_id {
 void ssb_pmu_set_ldo_voltage(struct ssb_chipcommon *cc,
 			     enum ssb_pmu_ldo_volt_id id, u32 voltage);
 void ssb_pmu_set_ldo_paref(struct ssb_chipcommon *cc, bool on);
+void ssb_pmu_spuravoid_pllupdate(struct ssb_chipcommon *cc, int spuravoid);
 
 #endif /* LINUX_SSB_CHIPCO_H_ */


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