Thread (4 messages) 4 messages, 3 authors, 2014-10-21

[PATCH v3 6/8] phy: miphy28lp: Add SSC support for PCIE

From: Valdis.Kletnieks at vt.edu <hidden>
Date: 2014-09-29 19:22:14
Also in: linux-devicetree, lkml

On Fri, 26 Sep 2014 10:54:15 +0200, Gabriel FERNANDEZ said:
SSC is the technique of modulating the operating frequency of a signal
slightly to spread its radiated emissions over a range of frequencies.
This reduction in the maximum emission for a given frequency helps meet
radiated emission requirements.
These settings are applicable for PCIE with Internal clock.
+		writeb_relaxed(0x69, miphy_phy->base + MIPHY_PLL_SBR_3);
+		writeb_relaxed(0x21, miphy_phy->base + MIPHY_PLL_SBR_4);
+		writeb_relaxed(0x3c, miphy_phy->base + MIPHY_PLL_SBR_2);
+		writeb_relaxed(0x21, miphy_phy->base + MIPHY_PLL_SBR_4);
+		writeb_relaxed(0x00, miphy_phy->base + MIPHY_PLL_SBR_1);
+		writeb_relaxed(0x02, miphy_phy->base + MIPHY_PLL_SBR_1);
+		writeb_relaxed(0x00, miphy_phy->base + MIPHY_PLL_SBR_1);
I'd feel a lot better about all these magic numbers (and the triple write
to SBR_1) if the Changelog or something referenced where they came from....
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