linux-kernel - [PATCH v2] usb: typec: mux: intel: Fix DP_HPD

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Message-Id: <20200510213934.146631-1-pmalani@chromium.org>
Date:   Sun, 10 May 2020 14:39:30 -0700
From:   Prashant Malani <pmalani@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     bleung@...omium.org, Prashant Malani <pmalani@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        linux-usb@...r.kernel.org (open list:USB TYPEC CLASS)
Subject: [PATCH v2] usb: typec: mux: intel: Fix DP_HPD_LVL bit field

According to the PMC Type C Subsystem (TCSS) Mux programming guide rev
0.6, the PMC HPD request LVL bit field is bit 4.
Fix the definition here to match the programming guide.

Since this bit field is changing, explicitly define a field for the
HPD_HIGH mode data bit.

Signed-off-by: Prashant Malani <pmalani@...omium.org>
Fixes: 6701adfa9693 ("usb: typec: driver for Intel PMC mux control")
Reviewed-by: Benson Leung <bleung@...omium.org>
---

Changes in v2:
- Fixed bit error in commit message.

 drivers/usb/typec/mux/intel_pmc_mux.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/typec/mux/intel_pmc_mux.c b/drivers/usb/typec/mux/intel_pmc_mux.c
index 67c5139cfa0d..15074aec94eb 100644
--- a/drivers/usb/typec/mux/intel_pmc_mux.c
+++ b/drivers/usb/typec/mux/intel_pmc_mux.c
@@ -63,6 +63,7 @@ enum {
 #define PMC_USB_ALTMODE_DP_MODE_SHIFT	8
 
 /* TBT specific Mode Data bits */
+#define PMC_USB_ALTMODE_HPD_HIGH	BIT(14)
 #define PMC_USB_ALTMODE_TBT_TYPE	BIT(17)
 #define PMC_USB_ALTMODE_CABLE_TYPE	BIT(18)
 #define PMC_USB_ALTMODE_ACTIVE_LINK	BIT(20)
@@ -75,7 +76,7 @@ enum {
 
 /* Display HPD Request bits */
 #define PMC_USB_DP_HPD_IRQ		BIT(5)
-#define PMC_USB_DP_HPD_LVL		BIT(6)
+#define PMC_USB_DP_HPD_LVL		BIT(4)
 
 struct pmc_usb;
 
@@ -158,8 +159,7 @@ pmc_usb_mux_dp(struct pmc_usb_port *port, struct typec_mux_state *state)
 			 PMC_USB_ALTMODE_DP_MODE_SHIFT;
 
 	if (data->status & DP_STATUS_HPD_STATE)
-		req.mode_data |= PMC_USB_DP_HPD_LVL <<
-				 PMC_USB_ALTMODE_DP_MODE_SHIFT;
+		req.mode_data |= PMC_USB_ALTMODE_HPD_HIGH;
 
 	return pmc_usb_command(port, (void *)&req, sizeof(req));
 }
-- 
2.26.2.645.ge9eca65c58-goog