Author: kevlo
Date: Thu Apr 16 07:40:01 2015
New Revision: 281592
URL: https://svnweb.freebsd.org/changeset/base/281592
Log:
Enable LDO to 2.5V before efuse r/w action in order to prevent
incorrect mac address read from efuse.
Reported by: swills
Tested by: rpaulo and myself on RPi
Modified:
head/sys/dev/usb/wlan/if_urtwn.c
Modified: head/sys/dev/usb/wlan/if_urtwn.c
==============================================================================
--- head/sys/dev/usb/wlan/if_urtwn.c Thu Apr 16 07:17:00 2015
(r281591)
+++ head/sys/dev/usb/wlan/if_urtwn.c Thu Apr 16 07:40:01 2015
(r281592)
@@ -1195,7 +1195,7 @@ urtwn_efuse_read(struct urtwn_softc *sc)
uint8_t *rom = (uint8_t *)&sc->rom;
uint16_t addr = 0;
uint32_t reg;
- uint8_t off, msk;
+ uint8_t off, msk, vol;
int i;
urtwn_efuse_switch_power(sc);
@@ -1228,10 +1228,15 @@ urtwn_efuse_read(struct urtwn_softc *sc)
printf("\n");
}
#endif
+ /* Disable LDO 2.5V. */
+ vol = urtwn_read_1(sc, R92C_EFUSE_TEST + 3);
+ urtwn_write_1(sc, R92C_EFUSE_TEST + 3, vol & ~(0x80));
+
}
static void
urtwn_efuse_switch_power(struct urtwn_softc *sc)
{
+ uint8_t vol;
uint32_t reg;
reg = urtwn_read_2(sc, R92C_SYS_ISO_CTRL);
@@ -1250,6 +1255,12 @@ urtwn_efuse_switch_power(struct urtwn_so
urtwn_write_2(sc, R92C_SYS_CLKR,
reg | R92C_SYS_CLKR_LOADER_EN | R92C_SYS_CLKR_ANA8M);
}
+
+ /* Enable LDO 2.5V. */
+ vol = urtwn_read_1(sc, R92C_EFUSE_TEST + 3);
+ vol &= 0x0f;
+ vol |= 0x30;
+ urtwn_write_1(sc, R92C_EFUSE_TEST + 3, (vol | 0x80));
}
static int
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