提交 8cf35797 编写于 作者: P Prashant Malani 提交者: zhaoxiaoqiang11

usb: typec: altmodes/displayport: Fix probe pin assign check

stable inclusion
from stable-v5.10.168
commit 4f518a4a79bddfd1f87fe62a85bdece5ee809614
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7URR4

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=4f518a4a79bddfd1f87fe62a85bdece5ee809614

----------------------------------------------------

commit 54e5c00a upstream.

While checking Pin Assignments of the port and partner during probe, we
don't take into account whether the peripheral is a plug or receptacle.

This manifests itself in a mode entry failure on certain docks and
dongles with captive cables. For instance, the Startech.com Type-C to DP
dongle (Model #CDP2DP) advertises its DP VDO as 0x405. This would fail
the Pin Assignment compatibility check, despite it supporting
Pin Assignment C as a UFP.

Update the check to use the correct DP Pin Assign macros that
take the peripheral's receptacle bit into account.

Fixes: c1e5c2f0 ("usb: typec: altmodes/displayport: correct pin assignment for UFP receptacles")
Cc: stable@vger.kernel.org
Reported-by: NDiana Zigterman <dzigterman@chromium.org>
Signed-off-by: NPrashant Malani <pmalani@chromium.org>
Link: https://lore.kernel.org/r/20230208205318.131385-1-pmalani@chromium.orgSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Nzhaoxiaoqiang11 <zhaoxiaoqiang11@jd.com>
上级 95bc19f2
......@@ -524,10 +524,10 @@ int dp_altmode_probe(struct typec_altmode *alt)
/* FIXME: Port can only be DFP_U. */
/* Make sure we have compatiple pin configurations */
if (!(DP_CAP_DFP_D_PIN_ASSIGN(port->vdo) &
DP_CAP_UFP_D_PIN_ASSIGN(alt->vdo)) &&
!(DP_CAP_UFP_D_PIN_ASSIGN(port->vdo) &
DP_CAP_DFP_D_PIN_ASSIGN(alt->vdo)))
if (!(DP_CAP_PIN_ASSIGN_DFP_D(port->vdo) &
DP_CAP_PIN_ASSIGN_UFP_D(alt->vdo)) &&
!(DP_CAP_PIN_ASSIGN_UFP_D(port->vdo) &
DP_CAP_PIN_ASSIGN_DFP_D(alt->vdo)))
return -ENODEV;
ret = sysfs_create_group(&alt->dev.kobj, &dp_altmode_group);
......
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