anx3429: force chip reset on PD_RESUME

we need to properly restart the anx3429 after a firmware update.
simply initializing the chip doesn't seem to get it to reload its
firmware - at least not the portion of the chip that implements the
firmware version register.  so, we explicitly power down and reset the
chip before reinitializing it to force it to run the new firmware.

the chip also needs a 10ms "off" time so the reset is properly seen by
the chip, so i did a light refactoring of the code paths that reset
the anx3429.

TEST=used 2 different firmware blobs and verified it switches between
	them during software sync.

BRANCH=none
BUG=b:35586895

Change-Id: I967898dd906f21bdc5bc4ce9c1dff9f873d198c1
Signed-off-by: Caveh Jalali <caveh@google.com>
Reviewed-on: https://chromium-review.googlesource.com/631976

1 files changed, 13 insertions, 1 deletions

diff --git a/driver/tcpm/anx74xx.h b/driver/tcpm/anx74xx.h
index 06720650bd..11ae964af7 100644
--- a/driver/tcpm/anx74xx.h
+++ b/driver/tcpm/anx74xx.h
@@ -186,13 +186,25 @@
 #define ANX74XX_CC_RD_MASK (BIT_VALUE_OF_SRC_CC_RD | \
 			    (BIT_VALUE_OF_SRC_CC_RD << 4))
 
+/*
+ * RESETN low to PWR_EN low delay
+ */
+#define ANX74XX_RST_L_PWR_L_DELAY_MS	1
+/*
+ * minimum power off-to-on delay to reset chip
+ */
+#define ANX74XX_PWR_L_PWR_H_DELAY_MS	10
+/*
+ * parameter T4: PWR_EN high to RESETN high delay
+ */
+#define ANX74XX_PWR_H_RST_H_DELAY_MS	10
+
 extern const struct tcpm_drv anx74xx_tcpm_drv;
 extern const struct usb_mux_driver anx74xx_tcpm_usb_mux_driver;
 void anx74xx_tcpc_set_vbus(int port, int enable);
 void anx74xx_tcpc_update_hpd_status(int port, int hpd_lvl, int hpd_irq);
 void anx74xx_tcpc_clear_hpd_status(int port);
 int anx74xx_tcpc_get_fw_version(int port, int *version);
-void anx74xx_handle_power_mode(int port, int mode);
 
 #ifdef CONFIG_CMD_I2C_STRESS_TEST_TCPC
 extern struct i2c_stress_test_dev anx74xx_i2c_stress_test_dev;