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| author | Ayushee <ayushee.shah@intel.com> | 2020-04-15 22:17:18 -0700 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2020-05-29 22:08:40 +0000 |
| commit | 87063754d48a046ad9a96149996fb3cf1e02f71c (patch) | |
| tree | 4dfd24ed76b15a4b243f74a7f1be85081a821096 /common/usb_pd_alt_mode_dfp.c | |
| parent | 0f6844002d1dc543bd5823b2d925a5f25bd9c1de (diff) | |
| download | chrome-ec-87063754d48a046ad9a96149996fb3cf1e02f71c.tar.gz | |
BB retimer: Correct setting USB4 cable speed
For DFP, TBT/USB4_cable_speed_support is set according to
a. Discover mode SOP' response for Thunderbolt-compat mode and
b. Discover ID SOP' response for USB4 mode.
Ref: Burnside Bridge spec Table 13: Connection state register
BUG=b:152544514
BRANCH=None
TEST=make buildall -j
Signed-off-by: Ayushee <ayushee.shah@intel.com>
Change-Id: Ic031489878dab701177936ea8e2f50d434dba25b
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2152287
Reviewed-by: Keith Short <keithshort@chromium.org>
Diffstat (limited to 'common/usb_pd_alt_mode_dfp.c')
| -rw-r--r-- | common/usb_pd_alt_mode_dfp.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/common/usb_pd_alt_mode_dfp.c b/common/usb_pd_alt_mode_dfp.c index 6d6859fceb..79ac93d94e 100644 --- a/common/usb_pd_alt_mode_dfp.c +++ b/common/usb_pd_alt_mode_dfp.c @@ -862,6 +862,37 @@ __overridable enum tbt_compat_cable_speed board_get_max_tbt_speed(int port) return cable->cable_mode_resp.tbt_cable_speed; } +/* + * ############################################################################ + * + * USB4 functions + * + * ############################################################################ + */ + +enum usb_rev30_ss get_usb4_cable_speed(int port) +{ + struct pd_cable *cable = pd_get_cable_attributes(port); + + /* + * TODO: Return USB4 cable speed for USB3.2 Gen 2 cables if DFP isn't + * Gen 3 capable. + */ + if ((cable->rev == PD_REV30) && + (get_usb_pd_cable_type(port) == IDH_PTYPE_PCABLE) && + ((cable->attr.p_rev30.ss != USB_R30_SS_U32_U40_GEN2) || + !IS_ENABLED(CONFIG_USB_PD_TBT_GEN3_CAPABLE))) { + return cable->attr.p_rev30.ss; + } + + /* + * Converting Thunderolt-Compatible cable speed to equivalent USB4 cable + * speed. + */ + return cable->cable_mode_resp.tbt_cable_speed == TBT_SS_TBT_GEN3 ? + USB_R30_SS_U40_GEN3 : USB_R30_SS_U32_U40_GEN2; +} + __overridable void svdm_safe_dp_mode(int port) { /* make DP interface safe until configure */ |