The ALPM_CTL can be updated from different context, so
add mutex to sychonize the update.
Signed-off-by: Animesh Manna <animesh.ma...@intel.com>
Reviewed-by: Jouni Högander <jouni.hogan...@intel.com>
---
drivers/gpu/drm/i915/display/intel_alpm.c | 9 ++++++++-
drivers/gpu/drm/i915/display/intel_alpm.h | 2 +-
drivers/gpu/drm/i915/display/intel_display_types.h | 1 +
drivers/gpu/drm/i915/display/intel_dp.c | 2 +-
4 files changed, 11 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_alpm.c
b/drivers/gpu/drm/i915/display/intel_alpm.c
index 46d569df37c0..55eaf2ba996c 100644
--- a/drivers/gpu/drm/i915/display/intel_alpm.c
+++ b/drivers/gpu/drm/i915/display/intel_alpm.c
@@ -23,7 +23,7 @@ bool intel_alpm_aux_less_wake_supported(struct intel_dp
*intel_dp)
return intel_dp->alpm_dpcd & DP_ALPM_AUX_LESS_CAP;
}
-void intel_alpm_init_dpcd(struct intel_dp *intel_dp)
+void intel_alpm_init(struct intel_dp *intel_dp)
{
u8 dpcd;
@@ -31,6 +31,7 @@ void intel_alpm_init_dpcd(struct intel_dp *intel_dp)
return;
intel_dp->alpm_dpcd = dpcd;
+ mutex_init(&intel_dp->alpm_parameters.lock);
}
/*
@@ -327,6 +328,7 @@ static void lnl_alpm_configure(struct intel_dp *intel_dp,
(!intel_dp->psr.sel_update_enabled && !intel_dp_is_edp(intel_dp)))
return;
+ mutex_lock(&intel_dp->alpm_parameters.lock);
/*
* Panel Replay on eDP is always using ALPM aux less. I.e. no need to
* check panel support at this point.
@@ -370,6 +372,7 @@ static void lnl_alpm_configure(struct intel_dp *intel_dp,
alpm_ctl |=
ALPM_CTL_ALPM_ENTRY_CHECK(intel_dp->alpm_parameters.check_entry_lines);
intel_de_write(display, ALPM_CTL(display, cpu_transcoder), alpm_ctl);
+ mutex_unlock(&intel_dp->alpm_parameters.lock);
}
void intel_alpm_configure(struct intel_dp *intel_dp,
@@ -493,6 +496,8 @@ void intel_alpm_disable(struct intel_dp *intel_dp)
if (DISPLAY_VER(display) < 20)
return;
+ mutex_lock(&intel_dp->alpm_parameters.lock);
+
intel_de_rmw(display, ALPM_CTL(display, cpu_transcoder),
ALPM_CTL_ALPM_ENABLE | ALPM_CTL_LOBF_ENABLE |
ALPM_CTL_ALPM_AUX_LESS_ENABLE, 0);
@@ -500,4 +505,6 @@ void intel_alpm_disable(struct intel_dp *intel_dp)
intel_de_rmw(display,
PORT_ALPM_CTL(cpu_transcoder),
PORT_ALPM_CTL_ALPM_AUX_LESS_ENABLE, 0);
+
+ mutex_unlock(&intel_dp->alpm_parameters.lock);
}
diff --git a/drivers/gpu/drm/i915/display/intel_alpm.h
b/drivers/gpu/drm/i915/display/intel_alpm.h
index 91f51fb24f98..012b0b1d17ff 100644
--- a/drivers/gpu/drm/i915/display/intel_alpm.h
+++ b/drivers/gpu/drm/i915/display/intel_alpm.h
@@ -15,7 +15,7 @@ struct intel_connector;
struct intel_atomic_state;
struct intel_crtc;
-void intel_alpm_init_dpcd(struct intel_dp *intel_dp);
+void intel_alpm_init(struct intel_dp *intel_dp);
bool intel_alpm_compute_params(struct intel_dp *intel_dp,
const struct intel_crtc_state *crtc_state);
void intel_alpm_lobf_compute_config(struct intel_dp *intel_dp,
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h
b/drivers/gpu/drm/i915/display/intel_display_types.h
index daa5e2438c94..f7500fd1ee8c 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1806,6 +1806,7 @@ struct intel_dp {
u8 io_wake_lines;
u8 fast_wake_lines;
enum transcoder transcoder;
+ struct mutex lock;
/* LNL and beyond */
u8 check_entry_lines;
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
b/drivers/gpu/drm/i915/display/intel_dp.c
index 7b95d62730e6..0d986d624d8c 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -6393,7 +6393,7 @@ static bool intel_edp_init_connector(struct intel_dp
*intel_dp,
*/
intel_hpd_enable_detection(encoder);
- intel_alpm_init_dpcd(intel_dp);
+ intel_alpm_init(intel_dp);
/* Cache DPCD and EDID for edp. */
has_dpcd = intel_edp_init_dpcd(intel_dp, connector);
--
2.29.0
