diff options
| author | Gil Fine <gil.fine@linux.intel.com> | 2023-01-31 14:04:52 +0300 |
|---|---|---|
| committer | Mika Westerberg <mika.westerberg@linux.intel.com> | 2023-03-13 12:54:31 +0300 |
| commit | f0a57dd33b3eadf540912cd130db727ea824d174 (patch) | |
| tree | 7ac76bb197898ddd12f2a5aa1ba0302d7cbed05e /drivers/thunderbolt/usb4.c | |
| parent | d2d6ddf188f609861489d5d188d545856a3ed399 (diff) | |
| download | linux-f0a57dd33b3eadf540912cd130db727ea824d174.tar.xz | |
thunderbolt: Limit USB3 bandwidth of certain Intel USB4 host routers
Current Intel USB4 host routers have hardware limitation that the USB3
bandwidth cannot go higher than 16376 Mb/s. Work this around by adding a
new quirk that limits the bandwidth for the affected host routers.
Cc: stable@vger.kernel.org
Signed-off-by: Gil Fine <gil.fine@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Diffstat (limited to 'drivers/thunderbolt/usb4.c')
| -rw-r--r-- | drivers/thunderbolt/usb4.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/drivers/thunderbolt/usb4.c b/drivers/thunderbolt/usb4.c index 95ff02395822..6e87cf993c68 100644 --- a/drivers/thunderbolt/usb4.c +++ b/drivers/thunderbolt/usb4.c @@ -1882,6 +1882,15 @@ int usb4_port_retimer_nvm_read(struct tb_port *port, u8 index, usb4_port_retimer_nvm_read_block, &info); } +static inline unsigned int +usb4_usb3_port_max_bandwidth(const struct tb_port *port, unsigned int bw) +{ + /* Take the possible bandwidth limitation into account */ + if (port->max_bw) + return min(bw, port->max_bw); + return bw; +} + /** * usb4_usb3_port_max_link_rate() - Maximum support USB3 link rate * @port: USB3 adapter port @@ -1903,7 +1912,9 @@ int usb4_usb3_port_max_link_rate(struct tb_port *port) return ret; lr = (val & ADP_USB3_CS_4_MSLR_MASK) >> ADP_USB3_CS_4_MSLR_SHIFT; - return lr == ADP_USB3_CS_4_MSLR_20G ? 20000 : 10000; + ret = lr == ADP_USB3_CS_4_MSLR_20G ? 20000 : 10000; + + return usb4_usb3_port_max_bandwidth(port, ret); } /** @@ -1930,7 +1941,9 @@ int usb4_usb3_port_actual_link_rate(struct tb_port *port) return 0; lr = val & ADP_USB3_CS_4_ALR_MASK; - return lr == ADP_USB3_CS_4_ALR_20G ? 20000 : 10000; + ret = lr == ADP_USB3_CS_4_ALR_20G ? 20000 : 10000; + + return usb4_usb3_port_max_bandwidth(port, ret); } static int usb4_usb3_port_cm_request(struct tb_port *port, bool request) |