[Intel-gfx] [PATCH] drm/i915: Allow control of PSR at runtime through debugfs.
Maarten Lankhorst
maarten.lankhorst at linux.intel.com
Wed Mar 14 15:58:32 UTC 2018
Currently tests modify i915.enable_psr and then do a modeset cycle
to change PSR. We can write a value to i915_edp_psr_status to force
a certain value without a modeset.
To retain compatibility with older userspace, we also still allow
the override through the module parameter, and add some tracking
to check whether a debugfs mode is specified.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
drivers/gpu/drm/i915/i915_debugfs.c | 193 +++++++++++++++++++++++++++++++++++-
drivers/gpu/drm/i915/i915_drv.h | 7 ++
drivers/gpu/drm/i915/intel_drv.h | 7 ++
drivers/gpu/drm/i915/intel_psr.c | 155 ++++++++++++++++++-----------
4 files changed, 301 insertions(+), 61 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 574fcf234007..4abf8034d5c7 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2546,16 +2546,13 @@ static const char *psr2_live_status(u32 val)
static int i915_edp_psr_status(struct seq_file *m, void *data)
{
- struct drm_i915_private *dev_priv = node_to_i915(m->private);
+ struct drm_i915_private *dev_priv = m->private;
u32 psrperf = 0;
u32 stat[3];
enum pipe pipe;
bool enabled = false;
bool sink_support;
- if (!HAS_PSR(dev_priv))
- return -ENODEV;
-
sink_support = dev_priv->psr.sink_support;
seq_printf(m, "Sink_Support: %s\n", yesno(sink_support));
if (!sink_support)
@@ -2631,6 +2628,192 @@ static int i915_edp_psr_status(struct seq_file *m, void *data)
return 0;
}
+static bool psr_global_enabled(enum i915_psr_debugfs_mode mode)
+{
+ switch (mode) {
+ case PSR_DEBUGFS_MODE_DEFAULT: return i915_modparams.enable_psr;
+ case PSR_DEBUGFS_MODE_DISABLED: return false;
+ case PSR_DEBUGFS_MODE_ENABLED: return true;
+ }
+
+ /* GCC is stupid. */
+ return false;
+}
+
+static bool psr_needs_disable(struct drm_i915_private *dev_priv,
+ bool enable, bool link_standby)
+{
+ if (!dev_priv->psr.hw_configured)
+ return false;
+
+ if (!enable)
+ return true;
+
+ if (dev_priv->psr.link_standby != link_standby)
+ return true;
+
+ return false;
+}
+
+static bool psr_needs_enable(struct drm_i915_private *dev_priv,
+ bool enable)
+{
+ return enable && !dev_priv->psr.hw_configured;
+}
+
+static int __i915_edp_psr_write(struct drm_i915_private *dev_priv,
+ struct drm_modeset_acquire_ctx *ctx,
+ enum i915_psr_debugfs_mode mode,
+ bool link_standby)
+{
+ struct drm_device *dev = &dev_priv->drm;
+ struct drm_connector_list_iter conn_iter;
+ struct drm_connector *connector;
+ struct drm_encoder *encoder;
+ struct drm_crtc *crtc;
+ int ret;
+ bool needs_enable, found, enable;
+
+ ret = drm_modeset_lock(&dev->mode_config.connection_mutex, ctx);
+ if (ret)
+ return ret;
+
+ mutex_lock(&dev_priv->psr.lock);
+retry:
+ if (!dev_priv->psr.enabled) {
+ dev_priv->psr.debugfs_mode = mode;
+ dev_priv->psr.link_standby = link_standby;
+ goto end;
+ }
+ encoder = &dp_to_dig_port(dev_priv->psr.enabled)->base.base;
+ mutex_unlock(&dev_priv->psr.lock);
+
+ found = false;
+ drm_connector_list_iter_begin(dev, &conn_iter);
+ drm_for_each_connector_iter(connector, &conn_iter)
+ if (connector->state->best_encoder == encoder) {
+ found = true;
+ break;
+ }
+ drm_connector_list_iter_end(&conn_iter);
+
+ if (WARN_ON(!found))
+ return -EINVAL;
+
+ crtc = connector->state->crtc;
+ ret = drm_modeset_lock(&crtc->mutex, ctx);
+ if (ret)
+ return ret;
+
+ mutex_lock(&dev_priv->psr.lock);
+ enable = psr_global_enabled(mode);
+
+ if (dev_priv->psr.enabled != enc_to_intel_dp(encoder))
+ goto retry;
+
+ if ((connector->state->commit && !try_wait_for_completion(&connector->state->commit->hw_done)) ||
+ (crtc->state->commit && !try_wait_for_completion(&crtc->state->commit->hw_done))) {
+ ret = -EBUSY;
+ goto end;
+ }
+
+ if (psr_needs_disable(dev_priv, enable, link_standby))
+ __intel_psr_disable(dev_priv, dev_priv->psr.enabled, to_intel_crtc_state(crtc->state));
+
+ needs_enable = psr_needs_enable(dev_priv, enable);
+ dev_priv->psr.debugfs_mode = mode;
+ dev_priv->psr.link_standby = link_standby;
+
+ if (needs_enable)
+ __intel_psr_enable(dev_priv, dev_priv->psr.enabled, to_intel_crtc_state(crtc->state));
+
+end:
+ mutex_unlock(&dev_priv->psr.lock);
+ return ret;
+}
+
+static ssize_t i915_edp_psr_write(struct file *file, const char __user *ubuf,
+ size_t len, loff_t *offp)
+{
+ struct seq_file *m = file->private_data;
+ struct drm_i915_private *dev_priv = m->private;
+ struct drm_modeset_acquire_ctx ctx;
+ int ret, val;
+ bool link_standby;
+ enum i915_psr_debugfs_mode mode;
+
+ if (!dev_priv->psr.sink_support)
+ return -ENODEV;
+
+ ret = kstrtoint_from_user(ubuf, len, 10, &val);
+ if (ret < 0) {
+ bool enable;
+ ret = kstrtobool_from_user(ubuf, len, &enable);
+
+ if (ret < 0)
+ return ret;
+
+ val = enable;
+ }
+
+ switch (val) {
+ case -1:
+ case 0:
+ case 1:
+ link_standby = intel_psr_default_link_standby(dev_priv);
+ mode = val;
+ break;
+ case 2:
+ mode = PSR_DEBUGFS_MODE_ENABLED;
+ link_standby = true;
+ break;
+ case 3:
+ mode = PSR_DEBUGFS_MODE_ENABLED;
+ link_standby = false;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ intel_runtime_pm_get(dev_priv);
+
+ drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
+
+retry:
+ ret = __i915_edp_psr_write(dev_priv, &ctx, mode, link_standby);
+ if (ret == -EBUSY) {
+ ret = drm_modeset_backoff(&ctx);
+ if (!ret)
+ goto retry;
+ }
+
+ drm_modeset_drop_locks(&ctx);
+ drm_modeset_acquire_fini(&ctx);
+
+ intel_runtime_pm_put(dev_priv);
+
+ return ret ?: len;
+}
+
+static int i915_edp_psr_open(struct inode *inode, struct file *file)
+{
+ struct drm_i915_private *dev_priv = inode->i_private;
+
+ if (!HAS_PSR(dev_priv))
+ return -ENODEV;
+
+ return single_open(file, i915_edp_psr_status, dev_priv);
+}
+
+static const struct file_operations i915_edp_psr_ops = {
+ .owner = THIS_MODULE,
+ .open = i915_edp_psr_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .write = i915_edp_psr_write
+};
+
static int i915_sink_crc(struct seq_file *m, void *data)
{
struct drm_i915_private *dev_priv = node_to_i915(m->private);
@@ -4734,7 +4917,6 @@ static const struct drm_info_list i915_debugfs_list[] = {
{"i915_swizzle_info", i915_swizzle_info, 0},
{"i915_ppgtt_info", i915_ppgtt_info, 0},
{"i915_llc", i915_llc, 0},
- {"i915_edp_psr_status", i915_edp_psr_status, 0},
{"i915_sink_crc_eDP1", i915_sink_crc, 0},
{"i915_energy_uJ", i915_energy_uJ, 0},
{"i915_runtime_pm_status", i915_runtime_pm_status, 0},
@@ -4761,6 +4943,7 @@ static const struct i915_debugfs_files {
{"i915_wedged", &i915_wedged_fops},
{"i915_max_freq", &i915_max_freq_fops},
{"i915_min_freq", &i915_min_freq_fops},
+ {"i915_edp_psr_status", &i915_edp_psr_ops},
{"i915_cache_sharing", &i915_cache_sharing_fops},
{"i915_ring_missed_irq", &i915_ring_missed_irq_fops},
{"i915_ring_test_irq", &i915_ring_test_irq_fops},
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index b39c5f68efb2..6bf1c6d43f7a 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -607,6 +607,13 @@ struct i915_psr {
bool colorimetry_support;
bool alpm;
bool has_hw_tracking;
+ bool hw_configured;
+
+ enum i915_psr_debugfs_mode {
+ PSR_DEBUGFS_MODE_DEFAULT,
+ PSR_DEBUGFS_MODE_DISABLED,
+ PSR_DEBUGFS_MODE_ENABLED
+ } debugfs_mode;
void (*enable_source)(struct intel_dp *,
const struct intel_crtc_state *);
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 1f0e8f1e4594..c486090f4f52 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1871,11 +1871,18 @@ bool is_hdcp_supported(struct drm_i915_private *dev_priv, enum port port);
/* intel_psr.c */
#define CAN_PSR(dev_priv) (HAS_PSR(dev_priv) && dev_priv->psr.sink_support)
+bool intel_psr_default_link_standby(struct drm_i915_private *dev_priv);
void intel_psr_init_dpcd(struct intel_dp *intel_dp);
void intel_psr_enable(struct intel_dp *intel_dp,
const struct intel_crtc_state *crtc_state);
+void __intel_psr_enable(struct drm_i915_private *dev_priv,
+ struct intel_dp *intel_dp,
+ const struct intel_crtc_state *crtc_state);
void intel_psr_disable(struct intel_dp *intel_dp,
const struct intel_crtc_state *old_crtc_state);
+void __intel_psr_disable(struct drm_i915_private *dev_priv,
+ struct intel_dp *intel_dp,
+ const struct intel_crtc_state *old_crtc_state);
void intel_psr_invalidate(struct drm_i915_private *dev_priv,
unsigned frontbuffer_bits,
enum fb_op_origin origin);
diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index 317cb4a12693..cfce5861b9ad 100644
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -56,6 +56,48 @@
#include "intel_drv.h"
#include "i915_drv.h"
+bool intel_psr_default_link_standby(struct drm_i915_private *dev_priv)
+{
+ /* Override link_standby x link_off defaults */
+ if (i915_modparams.enable_psr == 2) {
+ DRM_DEBUG_KMS("PSR: Forcing link standby\n");
+ return true;
+ }
+
+ if (i915_modparams.enable_psr == 3) {
+ DRM_DEBUG_KMS("PSR: Forcing main link off\n");
+ return false;
+ }
+
+ /* Set link_standby x link_off defaults */
+ if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
+ /* HSW and BDW require workarounds that we don't implement. */
+ return false;
+ else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
+ /* On VLV and CHV only standby mode is supported. */
+ return true;
+ else
+ /* For new platforms let's respect VBT back again */
+ return dev_priv->vbt.psr.full_link;
+}
+
+static bool intel_psr_global_enabled(struct drm_i915_private *dev_priv)
+{
+ switch (dev_priv->psr.debugfs_mode) {
+ case PSR_DEBUGFS_MODE_DEFAULT: return i915_modparams.enable_psr;
+ case PSR_DEBUGFS_MODE_DISABLED: return false;
+ case PSR_DEBUGFS_MODE_ENABLED: return true;
+ }
+
+ /* GCC is stupid. */
+ return false;
+}
+
+static bool intel_psr_enabled(struct drm_i915_private *dev_priv)
+{
+ return dev_priv->psr.enabled && dev_priv->psr.hw_configured;
+}
+
static inline enum intel_display_power_domain
psr_aux_domain(struct intel_dp *intel_dp)
{
@@ -502,11 +544,6 @@ void intel_psr_compute_config(struct intel_dp *intel_dp,
if (!CAN_PSR(dev_priv))
return;
- if (!i915_modparams.enable_psr) {
- DRM_DEBUG_KMS("PSR disable by flag\n");
- return;
- }
-
/*
* HSW spec explicitly says PSR is tied to port A.
* BDW+ platforms with DDI implementation of PSR have different
@@ -559,7 +596,11 @@ void intel_psr_compute_config(struct intel_dp *intel_dp,
crtc_state->has_psr = true;
crtc_state->has_psr2 = intel_psr2_config_valid(intel_dp, crtc_state);
- DRM_DEBUG_KMS("Enabling PSR%s\n", crtc_state->has_psr2 ? "2" : "");
+
+ if (intel_psr_global_enabled(dev_priv))
+ DRM_DEBUG_KMS("Enabling PSR%s\n", crtc_state->has_psr2 ? "2" : "");
+ else
+ DRM_DEBUG_KMS("PSR disable by flag\n");
}
static void intel_psr_activate(struct intel_dp *intel_dp)
@@ -617,6 +658,34 @@ static void hsw_psr_enable_source(struct intel_dp *intel_dp,
}
}
+void __intel_psr_enable(struct drm_i915_private *dev_priv,
+ struct intel_dp *intel_dp,
+ const struct intel_crtc_state *crtc_state)
+{
+ dev_priv->psr.hw_configured = true;
+
+ dev_priv->psr.setup_vsc(intel_dp, crtc_state);
+ dev_priv->psr.enable_sink(intel_dp);
+ dev_priv->psr.enable_source(intel_dp, crtc_state);
+
+ if (INTEL_GEN(dev_priv) >= 9) {
+ intel_psr_activate(intel_dp);
+ } else {
+ /*
+ * FIXME: Activation should happen immediately since this
+ * function is just called after pipe is fully trained and
+ * enabled.
+ * However on some platforms we face issues when first
+ * activation follows a modeset so quickly.
+ * - On VLV/CHV we get bank screen on first activation
+ * - On HSW/BDW we get a recoverable frozen screen until
+ * next exit-activate sequence.
+ */
+ schedule_delayed_work(&dev_priv->psr.work,
+ msecs_to_jiffies(intel_dp->panel_power_cycle_delay * 5));
+ }
+}
+
/**
* intel_psr_enable - Enable PSR
* @intel_dp: Intel DP
@@ -647,27 +716,10 @@ void intel_psr_enable(struct intel_dp *intel_dp,
dev_priv->psr.psr2_support = crtc_state->has_psr2;
dev_priv->psr.busy_frontbuffer_bits = 0;
- dev_priv->psr.setup_vsc(intel_dp, crtc_state);
- dev_priv->psr.enable_sink(intel_dp);
- dev_priv->psr.enable_source(intel_dp, crtc_state);
dev_priv->psr.enabled = intel_dp;
- if (INTEL_GEN(dev_priv) >= 9) {
- intel_psr_activate(intel_dp);
- } else {
- /*
- * FIXME: Activation should happen immediately since this
- * function is just called after pipe is fully trained and
- * enabled.
- * However on some platforms we face issues when first
- * activation follows a modeset so quickly.
- * - On VLV/CHV we get bank screen on first activation
- * - On HSW/BDW we get a recoverable frozen screen until
- * next exit-activate sequence.
- */
- schedule_delayed_work(&dev_priv->psr.work,
- msecs_to_jiffies(intel_dp->panel_power_cycle_delay * 5));
- }
+ if (intel_psr_global_enabled(dev_priv))
+ __intel_psr_enable(dev_priv, intel_dp, crtc_state);
unlock:
mutex_unlock(&dev_priv->psr.lock);
@@ -752,6 +804,17 @@ static void hsw_psr_disable(struct intel_dp *intel_dp,
psr_aux_io_power_put(intel_dp);
}
+void __intel_psr_disable(struct drm_i915_private *dev_priv,
+ struct intel_dp *intel_dp,
+ const struct intel_crtc_state *old_crtc_state)
+{
+ dev_priv->psr.disable_source(intel_dp, old_crtc_state);
+
+ /* Disable PSR on Sink */
+ drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, 0);
+ dev_priv->psr.hw_configured = false;
+}
+
/**
* intel_psr_disable - Disable PSR
* @intel_dp: Intel DP
@@ -773,15 +836,13 @@ void intel_psr_disable(struct intel_dp *intel_dp,
return;
mutex_lock(&dev_priv->psr.lock);
- if (!dev_priv->psr.enabled) {
+ if (intel_dp != dev_priv->psr.enabled) {
mutex_unlock(&dev_priv->psr.lock);
return;
}
- dev_priv->psr.disable_source(intel_dp, old_crtc_state);
-
- /* Disable PSR on Sink */
- drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, 0);
+ if (intel_psr_enabled(dev_priv))
+ __intel_psr_disable(dev_priv, intel_dp, old_crtc_state);
dev_priv->psr.enabled = NULL;
mutex_unlock(&dev_priv->psr.lock);
@@ -833,11 +894,11 @@ static void intel_psr_work(struct work_struct *work)
}
}
mutex_lock(&dev_priv->psr.lock);
- intel_dp = dev_priv->psr.enabled;
-
- if (!intel_dp)
+ if (!intel_psr_enabled(dev_priv))
goto unlock;
+ intel_dp = dev_priv->psr.enabled;
+
/*
* The delayed work can race with an invalidate hence we need to
* recheck. Since psr_flush first clears this and then reschedules we
@@ -933,7 +994,7 @@ void intel_psr_single_frame_update(struct drm_i915_private *dev_priv,
return;
mutex_lock(&dev_priv->psr.lock);
- if (!dev_priv->psr.enabled) {
+ if (!intel_psr_enabled(dev_priv)) {
mutex_unlock(&dev_priv->psr.lock);
return;
}
@@ -979,7 +1040,7 @@ void intel_psr_invalidate(struct drm_i915_private *dev_priv,
return;
mutex_lock(&dev_priv->psr.lock);
- if (!dev_priv->psr.enabled) {
+ if (!intel_psr_enabled(dev_priv)) {
mutex_unlock(&dev_priv->psr.lock);
return;
}
@@ -1022,7 +1083,7 @@ void intel_psr_flush(struct drm_i915_private *dev_priv,
return;
mutex_lock(&dev_priv->psr.lock);
- if (!dev_priv->psr.enabled) {
+ if (!intel_psr_enabled(dev_priv)) {
mutex_unlock(&dev_priv->psr.lock);
return;
}
@@ -1081,26 +1142,8 @@ void intel_psr_init(struct drm_i915_private *dev_priv)
if (i915_modparams.enable_psr == -1)
i915_modparams.enable_psr = 0;
- /* Set link_standby x link_off defaults */
- if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
- /* HSW and BDW require workarounds that we don't implement. */
- dev_priv->psr.link_standby = false;
- else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
- /* On VLV and CHV only standby mode is supported. */
- dev_priv->psr.link_standby = true;
- else
- /* For new platforms let's respect VBT back again */
- dev_priv->psr.link_standby = dev_priv->vbt.psr.full_link;
-
- /* Override link_standby x link_off defaults */
- if (i915_modparams.enable_psr == 2 && !dev_priv->psr.link_standby) {
- DRM_DEBUG_KMS("PSR: Forcing link standby\n");
- dev_priv->psr.link_standby = true;
- }
- if (i915_modparams.enable_psr == 3 && dev_priv->psr.link_standby) {
- DRM_DEBUG_KMS("PSR: Forcing main link off\n");
- dev_priv->psr.link_standby = false;
- }
+ dev_priv->psr.link_standby = intel_psr_default_link_standby(dev_priv);
+ dev_priv->psr.debugfs_mode = PSR_DEBUGFS_MODE_DEFAULT;
INIT_DELAYED_WORK(&dev_priv->psr.work, intel_psr_work);
mutex_init(&dev_priv->psr.lock);
--
2.16.2
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