Author: imp
Date: Tue May 5 04:23:55 2015
New Revision: 282447
URL: https://svnweb.freebsd.org/changeset/base/282447
Log:
Add some data found in TI's application note "SCPA035: PCI1510
Implementation Guide" about default values.
Modified:
head/sys/dev/pccbb/pccbb_pci.c
Modified: head/sys/dev/pccbb/pccbb_pci.c
==============================================================================
--- head/sys/dev/pccbb/pccbb_pci.c Tue May 5 04:13:48 2015
(r282446)
+++ head/sys/dev/pccbb/pccbb_pci.c Tue May 5 04:23:55 2015
(r282447)
@@ -511,6 +511,13 @@ cbb_chipinit(struct cbb_softc *sc)
* register since changing them have subtle side effects
* for different variants of the card and are
* extremely difficult to exaustively test.
+ *
+ * Also, the TI 1510/1520 changed the default for the MFUNC
+ * register from 0x0 to 0x1000 to enable IRQSER by default.
+ * We want to be careful to avoid overriding that, and the
+ * below test will do that. Should this check prove to be
+ * too permissive, we should just check against 0 and 0x1000
+ * and not touch it otherwise.
*/
mux = pci_read_config(sc->dev, CBBR_MFUNC, 4);
sysctrl = pci_read_config(sc->dev, CBBR_SYSCTRL, 4);
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