Re: [PATCH v4 11/13] staging: typec: tcpci: keep the not connecting cc line open

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On 03/28/2018 09:06 AM, Li Jun wrote:
While set polarity, we should keep the not connecting cc line to be
open.


The more I look at this code, the more I am confused by it.

The original code doesn't touch the CC lines. This function only sets the polarity.
Is it really appropriate to touch the CC lines in the same function ?

Guenter

Signed-off-by: Li Jun <jun.li@xxxxxxx>
---
  drivers/staging/typec/tcpci.c | 18 ++++++++++++++----
  1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/typec/tcpci.c b/drivers/staging/typec/tcpci.c
index d5b4e4e..b58bd59 100644
--- a/drivers/staging/typec/tcpci.c
+++ b/drivers/staging/typec/tcpci.c
@@ -185,15 +185,25 @@ static int tcpci_set_polarity(struct tcpc_dev *tcpc,
  			      enum typec_cc_polarity polarity)
  {
  	struct tcpci *tcpci = tcpc_to_tcpci(tcpc);
+	unsigned int reg;
  	int ret;
- ret = regmap_write(tcpci->regmap, TCPC_TCPC_CTRL,
-			   (polarity == TYPEC_POLARITY_CC2) ?
-			   TCPC_TCPC_CTRL_ORIENTATION : 0);
+	/* Keep the disconnect cc line open */
+	ret = regmap_read(tcpci->regmap, TCPC_ROLE_CTRL, &reg);
  	if (ret < 0)
  		return ret;
- return 0;
+	if (polarity == TYPEC_POLARITY_CC2)
+		reg |= TCPC_ROLE_CTRL_CC_OPEN << TCPC_ROLE_CTRL_CC1_SHIFT;
+	else
+		reg |= TCPC_ROLE_CTRL_CC_OPEN << 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_TCPC_CTRL,
+			   (polarity == TYPEC_POLARITY_CC2) ?
+			   TCPC_TCPC_CTRL_ORIENTATION : 0);
  }
static int tcpci_set_vconn(struct tcpc_dev *tcpc, bool enable)


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