usb: typec: altmodes/displayport: correct pin assignment for UFP receptacles

Fix incorrect pin assignment values when connecting to a monitor with
Type-C receptacle instead of a plug.

According to specification, an UFP_D receptacle's pin assignment
should came from the UFP_D pin assignments field (bit 23:16), while
an UFP_D plug's assignments are described in the DFP_D pin assignments
(bit 15:8) during Mode Discovery.

For example the LG 27 UL850-W is a monitor with Type-C receptacle.
The monitor responds to MODE DISCOVERY command with following
DisplayPort Capability flag:

        dp->alt->vdo=0x140045

The existing logic only take cares of UPF_D plug case,
and would take the bit 15:8 for this 0x140045 case.

This results in an non-existing pin assignment 0x0 in
dp_altmode_configure.

To fix this problem a new set of macros are introduced
to take plug/receptacle differences into consideration.

Fixes: 5e5a5296796c ("usb: typec: Add driver for DisplayPort alternate mode")
Cc: stable@vger.kernel.org
Co-developed-by: Pablo Sun <pablo.sun@mediatek.com>
Co-developed-by: Macpaul Lin <macpaul.lin@mediatek.com>
Reviewed-by: Guillaume Ranquet <granquet@baylibre.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Pablo Sun <pablo.sun@mediatek.com>
Signed-off-by: Macpaul Lin <macpaul.lin@mediatek.com>
Link: https://lore.kernel.org/r/20220804034803.19486-1-macpaul.lin@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c
index c1d8c23baa399cdafcb64c628a49e7ab9e3909fd..de66a2949e33b2b2f029056af449228b851904f6 100644 (file)
--- a/drivers/usb/typec/altmodes/displayport.c
+++ b/drivers/usb/typec/altmodes/displayport.c
@@ -99,8 +99,8 @@ static int dp_altmode_configure(struct dp_altmode *dp, u8 con)
        case DP_STATUS_CON_UFP_D:
        case DP_STATUS_CON_BOTH: /* NOTE: First acting as DP source */
                conf |= DP_CONF_UFP_U_AS_UFP_D;
-               pin_assign = DP_CAP_DFP_D_PIN_ASSIGN(dp->alt->vdo) &
-                            DP_CAP_UFP_D_PIN_ASSIGN(dp->port->vdo);
+               pin_assign = DP_CAP_PIN_ASSIGN_UFP_D(dp->alt->vdo) &
+                                DP_CAP_PIN_ASSIGN_DFP_D(dp->port->vdo);
                break;
        default:
                break;

diff --git a/include/linux/usb/typec_dp.h b/include/linux/usb/typec_dp.h
index cfb916cccd316b345a824564600324c65e1f3630..8d09c2f0a9b80717cdda7eba91cf63959d3be158 100644 (file)
--- a/include/linux/usb/typec_dp.h
+++ b/include/linux/usb/typec_dp.h
@@ -73,6 +73,11 @@ enum {
 #define DP_CAP_USB                     BIT(7)
 #define DP_CAP_DFP_D_PIN_ASSIGN(_cap_) (((_cap_) & GENMASK(15, 8)) >> 8)
 #define DP_CAP_UFP_D_PIN_ASSIGN(_cap_) (((_cap_) & GENMASK(23, 16)) >> 16)
+/* Get pin assignment taking plug & receptacle into consideration */
+#define DP_CAP_PIN_ASSIGN_UFP_D(_cap_) ((_cap_ & DP_CAP_RECEPTACLE) ? \
+                       DP_CAP_UFP_D_PIN_ASSIGN(_cap_) : DP_CAP_DFP_D_PIN_ASSIGN(_cap_))
+#define DP_CAP_PIN_ASSIGN_DFP_D(_cap_) ((_cap_ & DP_CAP_RECEPTACLE) ? \
+                       DP_CAP_DFP_D_PIN_ASSIGN(_cap_) : DP_CAP_UFP_D_PIN_ASSIGN(_cap_))
 
 /* DisplayPort Status Update VDO bits */
 #define DP_STATUS_CONNECTION(_status_) ((_status_) & 3)