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From cf8b55ab71c780cefff2c152949303e82559701c Mon Sep 17 00:00:00 2001
From: Dom Cobley <popcornmix@gmail.com>
Date: Mon, 26 Jul 2021 18:03:53 +0100
Subject: [PATCH] drm/vc4: Increase the core clock based on HVS load
Depending on a given HVS output (HVS to PixelValves) and input (planes
attached to a channel) load, the HVS needs for the core clock to be
raised above its boot time default.
Failing to do so will result in a vblank timeout and a stalled display
pipeline.
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
drivers/gpu/drm/vc4/vc4_crtc.c | 15 +++++
drivers/gpu/drm/vc4/vc4_drv.h | 3 +
drivers/gpu/drm/vc4/vc4_kms.c | 116 ++++++++++++++++++++++++++++++++-
3 files changed, 131 insertions(+), 3 deletions(-)
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -660,12 +660,27 @@ static int vc4_crtc_atomic_check(struct
struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc_state);
struct drm_connector *conn;
struct drm_connector_state *conn_state;
+ struct drm_encoder *encoder;
int ret, i;
ret = vc4_hvs_atomic_check(crtc, state);
if (ret)
return ret;
+ encoder = vc4_get_crtc_encoder(crtc, crtc_state);
+ if (encoder) {
+ const struct drm_display_mode *mode = &crtc_state->adjusted_mode;
+ struct vc4_encoder *vc4_encoder = to_vc4_encoder(encoder);
+
+ mode = &crtc_state->adjusted_mode;
+ if (vc4_encoder->type == VC4_ENCODER_TYPE_HDMI0) {
+ vc4_state->hvs_load = max(mode->clock * mode->hdisplay / mode->htotal + 1000,
+ mode->clock * 9 / 10) * 1000;
+ } else {
+ vc4_state->hvs_load = mode->clock * 1000;
+ }
+ }
+
for_each_new_connector_in_state(state, conn, conn_state,
i) {
if (conn_state->crtc != crtc)
--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -326,6 +326,7 @@ struct vc4_hvs {
u32 __iomem *dlist;
struct clk *core_clk;
+ struct clk_request *core_req;
/* Memory manager for CRTCs to allocate space in the display
* list. Units are dwords.
@@ -537,6 +538,8 @@ struct vc4_crtc_state {
unsigned int bottom;
} margins;
+ unsigned long hvs_load;
+
/* Transitional state below, only valid during atomic commits */
bool update_muxing;
};
--- a/drivers/gpu/drm/vc4/vc4_kms.c
+++ b/drivers/gpu/drm/vc4/vc4_kms.c
@@ -40,6 +40,9 @@ static struct vc4_ctm_state *to_vc4_ctm_
struct vc4_hvs_state {
struct drm_private_state base;
unsigned int unassigned_channels;
+ unsigned int num_outputs;
+ unsigned long fifo_load;
+ unsigned long core_clock_rate;
};
static struct vc4_hvs_state *
@@ -186,6 +189,19 @@ vc4_ctm_commit(struct vc4_dev *vc4, stru
}
static struct vc4_hvs_state *
+vc4_hvs_get_new_global_state(struct drm_atomic_state *state)
+{
+ struct vc4_dev *vc4 = to_vc4_dev(state->dev);
+ struct drm_private_state *priv_state;
+
+ priv_state = drm_atomic_get_new_private_obj_state(state, &vc4->hvs_channels);
+ if (IS_ERR(priv_state))
+ return ERR_CAST(priv_state);
+
+ return to_vc4_hvs_state(priv_state);
+}
+
+static struct vc4_hvs_state *
vc4_hvs_get_global_state(struct drm_atomic_state *state)
{
struct vc4_dev *vc4 = to_vc4_dev(state->dev);
@@ -312,10 +328,15 @@ vc4_atomic_complete_commit(struct drm_at
struct vc4_dev *vc4 = to_vc4_dev(dev);
struct vc4_hvs *hvs = vc4->hvs;
struct drm_crtc_state *new_crtc_state;
+ struct vc4_hvs_state *hvs_state;
struct drm_crtc *crtc;
struct clk_request *core_req;
int i;
+ hvs_state = vc4_hvs_get_new_global_state(state);
+ if (WARN_ON(!hvs_state))
+ return;
+
for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
struct vc4_crtc_state *vc4_crtc_state;
@@ -326,9 +347,20 @@ vc4_atomic_complete_commit(struct drm_at
vc4_hvs_mask_underrun(dev, vc4_crtc_state->assigned_channel);
}
- if (vc4->hvs && vc4->hvs->hvs5)
+ if (vc4->hvs && vc4->hvs->hvs5) {
+ /*
+ * Do a temporary request on the core clock during the
+ * modeset.
+ */
core_req = clk_request_start(hvs->core_clk, 500000000);
+ /*
+ * And remove the previous one based on the HVS
+ * requirements if any.
+ */
+ clk_request_done(hvs->core_req);
+ }
+
drm_atomic_helper_wait_for_fences(dev, state, false);
drm_atomic_helper_wait_for_dependencies(state);
@@ -358,8 +390,20 @@ vc4_atomic_complete_commit(struct drm_at
drm_atomic_helper_commit_cleanup_done(state);
- if (vc4->hvs && vc4->hvs->hvs5)
+ if (vc4->hvs && vc4->hvs->hvs5) {
+ drm_dbg(dev, "Running the core clock at %lu Hz\n",
+ hvs_state->core_clock_rate);
+
+ /*
+ * Request a clock rate based on the current HVS
+ * requirements.
+ */
+ hvs->core_req = clk_request_start(hvs->core_clk,
+ hvs_state->core_clock_rate);
+
+ /* And drop the temporary request */
clk_request_done(core_req);
+ }
drm_atomic_state_put(state);
@@ -703,6 +747,9 @@ vc4_hvs_channels_duplicate_state(struct
__drm_atomic_helper_private_obj_duplicate_state(obj, &state->base);
state->unassigned_channels = old_state->unassigned_channels;
+ state->fifo_load = old_state->fifo_load;
+ state->num_outputs = old_state->num_outputs;
+ state->core_clock_rate = old_state->core_clock_rate;
return &state->base;
}
@@ -849,6 +896,65 @@ static int vc4_pv_muxing_atomic_check(st
}
static int
+vc4_core_clock_atomic_check(struct drm_atomic_state *state)
+{
+ struct vc4_dev *vc4 = to_vc4_dev(state->dev);
+ struct drm_private_state *priv_state;
+ struct vc4_hvs_state *hvs_new_state;
+ struct vc4_load_tracker_state *load_state;
+ struct drm_crtc_state *old_crtc_state, *new_crtc_state;
+ struct drm_crtc *crtc;
+ unsigned long pixel_rate;
+ unsigned long cob_rate;
+ unsigned int i;
+
+ priv_state = drm_atomic_get_private_obj_state(state,
+ &vc4->load_tracker);
+ if (IS_ERR(priv_state))
+ return PTR_ERR(priv_state);
+
+ load_state = to_vc4_load_tracker_state(priv_state);
+
+ hvs_new_state = vc4_hvs_get_global_state(state);
+ if (!hvs_new_state)
+ return -EINVAL;
+
+ for_each_oldnew_crtc_in_state(state, crtc,
+ old_crtc_state,
+ new_crtc_state,
+ i) {
+ if (old_crtc_state->active) {
+ struct vc4_crtc_state *old_vc4_state =
+ to_vc4_crtc_state(old_crtc_state);
+
+ hvs_new_state->num_outputs -= 1;
+ hvs_new_state->fifo_load -= old_vc4_state->hvs_load;
+ }
+
+ if (new_crtc_state->active) {
+ struct vc4_crtc_state *new_vc4_state =
+ to_vc4_crtc_state(new_crtc_state);
+
+ hvs_new_state->num_outputs += 1;
+ hvs_new_state->fifo_load += new_vc4_state->hvs_load;
+ }
+ }
+
+ cob_rate = hvs_new_state->fifo_load;
+ pixel_rate = load_state->hvs_load;
+ if (hvs_new_state->num_outputs > 1) {
+ pixel_rate = (pixel_rate * 40) / 100;
+ } else {
+ pixel_rate = (pixel_rate * 60) / 100;
+ }
+
+ hvs_new_state->core_clock_rate = max(cob_rate, pixel_rate);
+
+ return 0;
+}
+
+
+static int
vc4_atomic_check(struct drm_device *dev, struct drm_atomic_state *state)
{
int ret;
@@ -865,7 +971,11 @@ vc4_atomic_check(struct drm_device *dev,
if (ret)
return ret;
- return vc4_load_tracker_atomic_check(state);
+ ret = vc4_load_tracker_atomic_check(state);
+ if (ret)
+ return ret;
+
+ return vc4_core_clock_atomic_check(state);
}
static const struct drm_mode_config_funcs vc4_mode_funcs = {
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