[PATCH 08/12] staging: typec: tcpci: correct drp toggling

[Li Jun <jun.li-3arQi8VN3Tc@public.gmane.org>]

Per tcpci spec 4.4.5.2 ROLE_CONTROL description: "the TCPM shall
write B6 (DRP) =1b and the starting value of Rp/Rd to B3..0 (CC1/CC2)
to indicate DRP autonomous toggling mode to the TCPC", so add CC1/CC2
setting, also we should issue COMMAND.Look4Connection to start it.

Signed-off-by: Li Jun <jun.li-3arQi8VN3Tc@public.gmane.org>
---
 drivers/staging/typec/tcpci.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/typec/tcpci.c b/drivers/staging/typec/tcpci.c
index 851d026..cea67f9 100644
--- a/drivers/staging/typec/tcpci.c
+++ b/drivers/staging/typec/tcpci.c
@@ -109,6 +109,7 @@ static int tcpci_start_drp_toggling(struct tcpc_dev *tcpc,
 {
 	struct tcpci *tcpci = tcpc_to_tcpci(tcpc);
 	unsigned int reg = TCPC_ROLE_CTRL_DRP;
+	int ret;
 
 	switch (cc) {
 	default:
@@ -126,7 +127,19 @@ static int tcpci_start_drp_toggling(struct tcpc_dev *tcpc,
 		break;
 	}
 
-	return regmap_write(tcpci->regmap, TCPC_ROLE_CTRL, reg);
+	if (cc == TYPEC_CC_RD)
+		reg |= (TCPC_ROLE_CTRL_CC_RD << TCPC_ROLE_CTRL_CC1_SHIFT) |
+			(TCPC_ROLE_CTRL_CC_RD << TCPC_ROLE_CTRL_CC2_SHIFT);
+	else
+		reg |= (TCPC_ROLE_CTRL_CC_RP << TCPC_ROLE_CTRL_CC1_SHIFT) |
+			(TCPC_ROLE_CTRL_CC_RP << TCPC_ROLE_CTRL_CC2_SHIFT);
+
+	ret = regmap_write(tcpci->regmap, TCPC_ROLE_CTRL, reg);
+	if (ret < 0)
+		return ret;
+
+	return regmap_write(tcpci->regmap, TCPC_COMMAND,
+				TCPC_CMD_LOOK4CONNECTION);
 }
 
 static enum typec_cc_status tcpci_to_typec_cc(unsigned int cc, bool sink)
-- 
2.6.6

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