mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

drm/i915/tc: Fix TypeC PHY connect/disconnect logic on ADL-P 

So far TC-cold was blocked only for the duration of TypeC mode resets.
The DP-alt and legacy modes require TC-cold to be blocked also whenever
the port is in use (AUX transfers, enable modeset), and this was ensured
by the held PHY ownership flag. On ADL-P this doesn't work, since the
PHY ownership flag is in a register backed by the PW#2 power well.
Whenever this power well is disabled the ownership flag is cleared by
the HW under the driver.

The only way to cleanly release and re-acquire the PHY ownership flag
and also allow for power saving (by disabling the display power wells
and reaching DC5/6 states) is to hold the TC-cold blocking power domains
while the PHY is connected and disconnect/reconnect the PHY on-demand
around AUX transfers and modeset enable/disables. Let's do that,
disconnecting a PHY with a 1 sec delay after it becomes idle. For
consistency do this on all platforms and TypeC modes.

v2: Add tc_mode!=disconnected and phy_is_owned asserts to
    __intel_tc_port_lock().

Cc: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210929132833.2253961-6-imre.deak@intel.com
This commit is contained in:
Imre Deak 2021-09-29 16:28:32 +03:00
parent 38c393462d
commit 3e0abc7661
4 changed files with 65 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/gpu/drm/i915/display/intel_ddi.c
View File

@ -4017,8 +4017,11 @@ static void intel_ddi_encoder_destroy(struct drm_encoder *encoder)
{
struct drm_i915_private *i915 = to_i915(encoder->dev);
struct intel_digital_port *dig_port = enc_to_dig_port(to_intel_encoder(encoder));
enum phy phy = intel_port_to_phy(i915, dig_port->base.port);
intel_dp_encoder_flush_work(encoder);
if (intel_phy_is_tc(i915, phy))
intel_tc_port_flush_work(dig_port);
intel_display_power_flush_work(i915);
drm_encoder_cleanup(encoder);
@ -4443,7 +4446,7 @@ static void intel_ddi_encoder_suspend(struct intel_encoder *encoder)
if (!intel_phy_is_tc(i915, phy))
return;
intel_tc_port_disconnect_phy(dig_port);
intel_tc_port_flush_work(dig_port);
}
static void intel_ddi_encoder_shutdown(struct intel_encoder *encoder)
@ -4458,7 +4461,7 @@ static void intel_ddi_encoder_shutdown(struct intel_encoder *encoder)
if (!intel_phy_is_tc(i915, phy))
return;
intel_tc_port_disconnect_phy(dig_port);
intel_tc_port_flush_work(dig_port);
}
#define port_tc_name(port) ((port) - PORT_TC1 + '1')

1
drivers/gpu/drm/i915/display/intel_display_types.h
View File

@ -1666,6 +1666,7 @@ struct intel_digital_port {
struct mutex tc_lock; /* protects the TypeC port mode */
intel_wakeref_t tc_lock_wakeref;
enum intel_display_power_domain tc_lock_power_domain;
struct delayed_work tc_disconnect_phy_work;
int tc_link_refcount;
bool tc_legacy_port:1;
char tc_port_name[8];

93
drivers/gpu/drm/i915/display/intel_tc.c
View File

@ -666,6 +666,13 @@ static void intel_tc_port_update_mode(struct intel_digital_port *dig_port,
intel_tc_port_reset_mode(dig_port, required_lanes, force_disconnect);
/* Get power domain matching the new mode after reset. */
tc_cold_unblock(dig_port, dig_port->tc_lock_power_domain,
fetch_and_zero(&dig_port->tc_lock_wakeref));
if (dig_port->tc_mode != TC_PORT_DISCONNECTED)
dig_port->tc_lock_wakeref = tc_cold_block(dig_port,
&dig_port->tc_lock_power_domain);
tc_cold_unblock(dig_port, domain, wref);
}
@ -693,6 +700,7 @@ void intel_tc_port_sanitize(struct intel_digital_port *dig_port)
active_links = to_intel_crtc(encoder->base.crtc)->active;
drm_WARN_ON(&i915->drm, dig_port->tc_mode != TC_PORT_DISCONNECTED);
drm_WARN_ON(&i915->drm, dig_port->tc_lock_wakeref);
if (active_links) {
enum intel_display_power_domain domain;
intel_wakeref_t tc_cold_wref = tc_cold_block(dig_port, &domain);
@ -705,6 +713,9 @@ void intel_tc_port_sanitize(struct intel_digital_port *dig_port)
dig_port->tc_port_name, active_links);
intel_tc_port_link_init_refcount(dig_port, active_links);
dig_port->tc_lock_wakeref = tc_cold_block(dig_port,
&dig_port->tc_lock_power_domain);
tc_cold_unblock(dig_port, domain, tc_cold_wref);
}
@ -745,56 +756,67 @@ bool intel_tc_port_connected(struct intel_encoder *encoder)
}
static void __intel_tc_port_lock(struct intel_digital_port *dig_port,
int required_lanes, bool force_disconnect)
int required_lanes)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
intel_wakeref_t wakeref;
wakeref = intel_display_power_get(i915, POWER_DOMAIN_DISPLAY_CORE);
mutex_lock(&dig_port->tc_lock);
cancel_delayed_work(&dig_port->tc_disconnect_phy_work);
if (!dig_port->tc_link_refcount)
intel_tc_port_update_mode(dig_port, required_lanes,
force_disconnect);
false);
drm_WARN_ON(&i915->drm, dig_port->tc_lock_wakeref);
dig_port->tc_lock_wakeref = wakeref;
drm_WARN_ON(&i915->drm, dig_port->tc_mode == TC_PORT_DISCONNECTED);
drm_WARN_ON(&i915->drm, dig_port->tc_mode != TC_PORT_TBT_ALT &&
!tc_phy_is_owned(dig_port));
}
void intel_tc_port_lock(struct intel_digital_port *dig_port)
{
__intel_tc_port_lock(dig_port, 1, false);
__intel_tc_port_lock(dig_port, 1);
}
/**
* intel_tc_port_disconnect_phy_work: disconnect TypeC PHY from display port
* @dig_port: digital port
*
* Disconnect the given digital port from its TypeC PHY (handing back the
* control of the PHY to the TypeC subsystem). This will happen in a delayed
* manner after each aux transactions and modeset disables.
*/
static void intel_tc_port_disconnect_phy_work(struct work_struct *work)
{
struct intel_digital_port *dig_port =
container_of(work, struct intel_digital_port, tc_disconnect_phy_work.work);
mutex_lock(&dig_port->tc_lock);
if (!dig_port->tc_link_refcount)
intel_tc_port_update_mode(dig_port, 1, true);
mutex_unlock(&dig_port->tc_lock);
}
/**
* intel_tc_port_flush_work: flush the work disconnecting the PHY
* @dig_port: digital port
*
* Flush the delayed work disconnecting an idle PHY.
*/
void intel_tc_port_flush_work(struct intel_digital_port *dig_port)
{
flush_delayed_work(&dig_port->tc_disconnect_phy_work);
}
void intel_tc_port_unlock(struct intel_digital_port *dig_port)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
intel_wakeref_t wakeref = fetch_and_zero(&dig_port->tc_lock_wakeref);
if (!dig_port->tc_link_refcount && dig_port->tc_mode != TC_PORT_DISCONNECTED)
queue_delayed_work(system_unbound_wq, &dig_port->tc_disconnect_phy_work,
msecs_to_jiffies(1000));
mutex_unlock(&dig_port->tc_lock);
intel_display_power_put_async(i915, POWER_DOMAIN_DISPLAY_CORE,
wakeref);
}
/**
* intel_tc_port_disconnect_phy: disconnect TypeC PHY from display port
* @dig_port: digital port
*
* Disconnect the given digital port from its TypeC PHY (handing back the
* control of the PHY to the TypeC subsystem). The only purpose of this
* function is to force the disconnect even with a TypeC display output still
* plugged to the TypeC connector, which is required by the TypeC firmwares
* during system suspend and shutdown. Otherwise - during the unplug event
* handling - the PHY ownership is released automatically by
* intel_tc_port_reset_mode(), when calling this function is not required.
*/
void intel_tc_port_disconnect_phy(struct intel_digital_port *dig_port)
{
__intel_tc_port_lock(dig_port, 1, true);
intel_tc_port_unlock(dig_port);
}
bool intel_tc_port_ref_held(struct intel_digital_port *dig_port)
@ -806,16 +828,16 @@ bool intel_tc_port_ref_held(struct intel_digital_port *dig_port)
void intel_tc_port_get_link(struct intel_digital_port *dig_port,
int required_lanes)
{
__intel_tc_port_lock(dig_port, required_lanes, false);
__intel_tc_port_lock(dig_port, required_lanes);
dig_port->tc_link_refcount++;
intel_tc_port_unlock(dig_port);
}
void intel_tc_port_put_link(struct intel_digital_port *dig_port)
{
mutex_lock(&dig_port->tc_lock);
dig_port->tc_link_refcount--;
mutex_unlock(&dig_port->tc_lock);
intel_tc_port_lock(dig_port);
--dig_port->tc_link_refcount;
intel_tc_port_unlock(dig_port);
}
static bool
@ -871,6 +893,7 @@ void intel_tc_port_init(struct intel_digital_port *dig_port, bool is_legacy)
"%c/TC#%d", port_name(port), tc_port + 1);
mutex_init(&dig_port->tc_lock);
INIT_DELAYED_WORK(&dig_port->tc_disconnect_phy_work, intel_tc_port_disconnect_phy_work);
dig_port->tc_legacy_port = is_legacy;
dig_port->tc_mode = TC_PORT_DISCONNECTED;
dig_port->tc_link_refcount = 0;

2
drivers/gpu/drm/i915/display/intel_tc.h
View File

@ -17,7 +17,6 @@ bool intel_tc_port_in_dp_alt_mode(struct intel_digital_port *dig_port);
bool intel_tc_port_in_legacy_mode(struct intel_digital_port *dig_port);
bool intel_tc_port_connected(struct intel_encoder *encoder);
void intel_tc_port_disconnect_phy(struct intel_digital_port *dig_port);
u32 intel_tc_port_get_lane_mask(struct intel_digital_port *dig_port);
u32 intel_tc_port_get_pin_assignment_mask(struct intel_digital_port *dig_port);
@ -28,6 +27,7 @@ void intel_tc_port_set_fia_lane_count(struct intel_digital_port *dig_port,
void intel_tc_port_sanitize(struct intel_digital_port *dig_port);
void intel_tc_port_lock(struct intel_digital_port *dig_port);
void intel_tc_port_unlock(struct intel_digital_port *dig_port);
void intel_tc_port_flush_work(struct intel_digital_port *dig_port);
void intel_tc_port_get_link(struct intel_digital_port *dig_port,
int required_lanes);
void intel_tc_port_put_link(struct intel_digital_port *dig_port);