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| author | Rajmohan Mani <rajmohan.mani@intel.com> | 2021-04-01 17:20:17 +0200 |
|---|---|---|
| committer | Mika Westerberg <mika.westerberg@linux.intel.com> | 2021-06-01 09:53:31 +0200 |
| commit | ccc5cb8ad5d18ec0e008d1652711fa1c18e9366c (patch) | |
| tree | 16b4ea3e31c37bf3c8cf82b46152a65c5e76e520 /drivers/thunderbolt/tb.h | |
| parent | thunderbolt: Add USB4 port devices (diff) | |
| download | linux-ccc5cb8ad5d18ec0e008d1652711fa1c18e9366c.tar.xz linux-ccc5cb8ad5d18ec0e008d1652711fa1c18e9366c.zip | |
thunderbolt: Add support for ACPI _DSM to power on/off retimers
Typically retimers can be accessed only when the USB4 link is up (e.g
there is a cable connected). However, sometimes it is useful to be able
to access retimers even if there is nothing connected to the USB4 port.
For instance we may still want to be able to upgrade the retimer NVM
firmware even if the user does not have any USB4 devices. This is
something that USB4 spec leaves to implementers.
In case of ACPI based systems, we can support this by providing a
special _DSM method under each USB4 port. This _DSM can be used to turn
on power to on-board retimers (and cycle it through different modes so
that the sideband becomes usable).
This patch adds support for this _DSM and makes the functionality
available to the rest of the driver through tb_acpi_power_[on|off]_retimers().
Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com>
Co-developed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/thunderbolt/tb.h')
| -rw-r--r-- | drivers/thunderbolt/tb.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h index 948e7601428f..c5704f495afa 100644 --- a/drivers/thunderbolt/tb.h +++ b/drivers/thunderbolt/tb.h @@ -247,10 +247,13 @@ struct tb_port { * struct usb4_port - USB4 port device * @dev: Device for the port * @port: Pointer to the lane 0 adapter + * @can_offline: Does the port have necessary platform support to moved + * it into offline mode and back */ struct usb4_port { struct device dev; struct tb_port *port; + bool can_offline; }; /** @@ -1113,6 +1116,11 @@ bool tb_acpi_may_tunnel_usb3(void); bool tb_acpi_may_tunnel_dp(void); bool tb_acpi_may_tunnel_pcie(void); bool tb_acpi_is_xdomain_allowed(void); + +int tb_acpi_init(void); +void tb_acpi_exit(void); +int tb_acpi_power_on_retimers(struct tb_port *port); +int tb_acpi_power_off_retimers(struct tb_port *port); #else static inline void tb_acpi_add_links(struct tb_nhi *nhi) { } @@ -1121,6 +1129,11 @@ static inline bool tb_acpi_may_tunnel_usb3(void) { return true; } static inline bool tb_acpi_may_tunnel_dp(void) { return true; } static inline bool tb_acpi_may_tunnel_pcie(void) { return true; } static inline bool tb_acpi_is_xdomain_allowed(void) { return true; } + +static inline int tb_acpi_init(void) { return 0; } +static inline void tb_acpi_exit(void) { } +static inline int tb_acpi_power_on_retimers(struct tb_port *port) { return 0; } +static inline int tb_acpi_power_off_retimers(struct tb_port *port) { return 0; } #endif #ifdef CONFIG_DEBUG_FS |