[PATCH v2 10/14] drm/i915: Track which port is using which pipe's power sequencer

ville.syrjala
2014-09-04T11:54:24Z

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

VLV/CHV have a per-pipe panel power sequencer which locks onto the
port once used. We need to keep track wich power sequencers are
locked to which ports.

v2: remove spurious whitespace change, rebase due to backlight changes (Imre)

Reviewed-by: Antti Koskipaa <antti.koskipaa@linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
drivers/gpu/drm/i915/intel_dp.c | 187 ++++++++++++++++++++++++++++++++++-----
drivers/gpu/drm/i915/intel_drv.h | 6 ++
2 files changed, 169 insertions(+), 24 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 487bcb9..0dd0abd 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -294,28 +294,99 @@ static enum pipe
vlv_power_sequencer_pipe(struct intel_dp *intel_dp)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
- struct drm_crtc *crtc = intel_dig_port->base.base.crtc;
struct drm_device *dev = intel_dig_port->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
- enum port port = intel_dig_port->port;
- enum pipe pipe;
+ struct intel_encoder *encoder;
+ unsigned int pipes = (1 << PIPE_A) | (1 << PIPE_B);
+ struct edp_power_seq power_seq;

lockdep_assert_held(&dev_priv->pps_mutex);

- /* modeset should have pipe */
- if (crtc)
- return to_intel_crtc(crtc)->pipe;
+ if (intel_dp->pps_pipe != INVALID_PIPE)
+ return intel_dp->pps_pipe;
+
+ /*
+ * We don't have power sequencer currently.
+ * Pick one that's not used by other ports.
+ */
+ list_for_each_entry(encoder, &dev->mode_config.encoder_list, base.head) {
+ struct intel_dp *tmp;
+
+ if (encoder->type != INTEL_OUTPUT_EDP)
+ continue;
+
+ tmp = enc_to_intel_dp(&encoder->base);
+
+ if (tmp->pps_pipe != INVALID_PIPE)
+ pipes &= ~(1 << tmp->pps_pipe);
+ }
+
+ /*
+ * Didn't find one. This should not happen since there
+ * are two power sequencers and up to two eDP ports.
+ */
+ if (WARN_ON(pipes == 0))
+ return PIPE_A;
+
+ intel_dp->pps_pipe = ffs(pipes) - 1;
+
+ DRM_DEBUG_KMS("picked pipe %c power sequencer for port %c\n",
+ pipe_name(intel_dp->pps_pipe), port_name(intel_dig_port->port));
+
+ /* init power sequencer on this pipe and port */
+ intel_dp_init_panel_power_sequencer(dev, intel_dp, &power_seq);
+ intel_dp_init_panel_power_sequencer_registers(dev, intel_dp,
+ &power_seq);
+
+ return intel_dp->pps_pipe;
+}
+
+static enum pipe
+vlv_initial_power_sequencer_pipe(struct drm_i915_private *dev_priv,
+ enum port port)
+{
+ enum pipe pipe;

- /* init time, try to find a pipe with this port selected */
for (pipe = PIPE_A; pipe <= PIPE_B; pipe++) {
u32 port_sel = I915_READ(VLV_PIPE_PP_ON_DELAYS(pipe)) &
PANEL_PORT_SELECT_MASK;
- if (port_sel == PANEL_PORT_SELECT_VLV(port))
- return pipe;
+
+ if (port_sel != PANEL_PORT_SELECT_VLV(port))
+ continue;
+
+ return pipe;
}

- /* shrug */
- return PIPE_A;
+ return INVALID_PIPE;
+}
+
+static void
+vlv_initial_power_sequencer_setup(struct intel_dp *intel_dp)
+{
+ struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
+ struct drm_device *dev = intel_dig_port->base.base.dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct edp_power_seq power_seq;
+ enum port port = intel_dig_port->port;
+
+ lockdep_assert_held(&dev_priv->pps_mutex);
+
+ /* try to find a pipe with this port selected */
+ intel_dp->pps_pipe = vlv_initial_power_sequencer_pipe(dev_priv, port);
+
+ /* didn't find one? just let vlv_power_sequencer_pipe() pick one when needed */
+ if (intel_dp->pps_pipe == INVALID_PIPE) {
+ DRM_DEBUG_KMS("no initial power sequencer for port %c\n",
+ port_name(port));
+ return;
+ }
+
+ DRM_DEBUG_KMS("initial power sequencer for port %c: pipe %c\n",
+ port_name(port), pipe_name(intel_dp->pps_pipe));
+
+ intel_dp_init_panel_power_sequencer(dev, intel_dp, &power_seq);
+ intel_dp_init_panel_power_sequencer_registers(dev, intel_dp,
+ &power_seq);
}

static u32 _pp_ctrl_reg(struct intel_dp *intel_dp)
@@ -2255,6 +2326,76 @@ static void g4x_pre_enable_dp(struct intel_encoder *encoder)
}
}

+static void vlv_steal_power_sequencer(struct drm_device *dev,
+ enum pipe pipe)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct intel_encoder *encoder;
+
+ lockdep_assert_held(&dev_priv->pps_mutex);
+
+ list_for_each_entry(encoder, &dev->mode_config.encoder_list, base.head) {
+ struct intel_dp *intel_dp;
+
+ if (encoder->type != INTEL_OUTPUT_EDP)
+ continue;
+
+ intel_dp = enc_to_intel_dp(&encoder->base);
+
+ if (intel_dp->pps_pipe != pipe)
+ continue;
+
+ DRM_DEBUG_KMS("stealing pipe %c power sequencer from port %c\n",
+ pipe_name(pipe),
+ port_name(dp_to_dig_port(intel_dp)->port));
+
+ /* make sure vdd is off before we steal it */
+ edp_panel_vdd_off_sync(intel_dp);
+
+ intel_dp->pps_pipe = INVALID_PIPE;
+ }
+}
+
+static void vlv_init_panel_power_sequencer(struct intel_dp *intel_dp)
+{
+ struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
+ struct intel_encoder *encoder = &intel_dig_port->base;
+ struct drm_device *dev = encoder->base.dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
+ struct edp_power_seq power_seq;
+
+ lockdep_assert_held(&dev_priv->pps_mutex);
+
+ if (intel_dp->pps_pipe == crtc->pipe)
+ return;
+
+ /*
+ * If another power sequencer was being used on this
+ * port previously make sure to turn off vdd there while
+ * we still have control of it.
+ */
+ if (intel_dp->pps_pipe != INVALID_PIPE)
+ edp_panel_vdd_off_sync(intel_dp);
+
+ /*
+ * We may be stealing the power
+ * sequencer from another port.
+ */
+ vlv_steal_power_sequencer(dev, crtc->pipe);
+
+ /* now it's all ours */
+ intel_dp->pps_pipe = crtc->pipe;
+
+ DRM_DEBUG_KMS("initializing pipe %c power sequencer for port %c\n",
+ pipe_name(intel_dp->pps_pipe), port_name(intel_dig_port->port));
+
+ /* init power sequencer on this pipe and port */
+ intel_dp_init_panel_power_sequencer(dev, intel_dp, &power_seq);
+ intel_dp_init_panel_power_sequencer_registers(dev, intel_dp,
+ &power_seq);
+}
+
static void vlv_pre_enable_dp(struct intel_encoder *encoder)
{
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
@@ -2264,7 +2405,6 @@ static void vlv_pre_enable_dp(struct intel_encoder *encoder)
struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
enum dpio_channel port = vlv_dport_to_channel(dport);
int pipe = intel_crtc->pipe;
- struct edp_power_seq power_seq;
u32 val;

mutex_lock(&dev_priv->dpio_lock);
@@ -2283,11 +2423,8 @@ static void vlv_pre_enable_dp(struct intel_encoder *encoder)
mutex_unlock(&dev_priv->dpio_lock);

if (is_edp(intel_dp)) {
- /* init power sequencer on this pipe and port */
mutex_lock(&dev_priv->pps_mutex);
- intel_dp_init_panel_power_sequencer(dev, intel_dp, &power_seq);
- intel_dp_init_panel_power_sequencer_registers(dev, intel_dp,
- &power_seq);
+ vlv_init_panel_power_sequencer(intel_dp);
mutex_unlock(&dev_priv->pps_mutex);
}

@@ -2332,7 +2469,6 @@ static void chv_pre_enable_dp(struct intel_encoder *encoder)
struct intel_digital_port *dport = dp_to_dig_port(intel_dp);
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
- struct edp_power_seq power_seq;
struct intel_crtc *intel_crtc =
to_intel_crtc(encoder->base.crtc);
enum dpio_channel ch = vlv_dport_to_channel(dport);
@@ -2378,11 +2514,8 @@ static void chv_pre_enable_dp(struct intel_encoder *encoder)
mutex_unlock(&dev_priv->dpio_lock);

if (is_edp(intel_dp)) {
- /* init power sequencer on this pipe and port */
mutex_lock(&dev_priv->pps_mutex);
- intel_dp_init_panel_power_sequencer(dev, intel_dp, &power_seq);
- intel_dp_init_panel_power_sequencer_registers(dev, intel_dp,
- &power_seq);
+ vlv_init_panel_power_sequencer(intel_dp);
mutex_unlock(&dev_priv->pps_mutex);
}

@@ -4784,6 +4917,8 @@ intel_dp_init_connector(struct intel_digital_port *intel_dig_port,
struct edp_power_seq power_seq = { 0 };
int type;

+ intel_dp->pps_pipe = INVALID_PIPE;
+
/* intel_dp vfuncs */
if (IS_VALLEYVIEW(dev))
intel_dp->get_aux_clock_divider = vlv_get_aux_clock_divider;
@@ -4855,10 +4990,14 @@ intel_dp_init_connector(struct intel_digital_port *intel_dig_port,

if (is_edp(intel_dp)) {
mutex_lock(&dev_priv->pps_mutex);
- intel_dp_init_panel_power_timestamps(intel_dp);
- intel_dp_init_panel_power_sequencer(dev, intel_dp, &power_seq);
- mutex_unlock(&dev_priv->pps_mutex);
+ if (IS_VALLEYVIEW(dev)) {
+ vlv_initial_power_sequencer_setup(intel_dp);
+ } else {
+ intel_dp_init_panel_power_timestamps(intel_dp);
+ intel_dp_init_panel_power_sequencer(dev, intel_dp, &power_seq);
+ }
}
+ mutex_unlock(&dev_priv->pps_mutex);

intel_dp_aux_init(intel_dp, intel_connector);

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index d727d20..1278b25 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -570,6 +570,12 @@ struct intel_dp {

struct notifier_block edp_notifier;

+ /*
+ * Pipe whose power sequencer is currently locked into
+ * this port. Only relevant on VLV/CHV.
+ */
+ enum pipe pps_pipe;
+
bool use_tps3;
bool can_mst; /* this port supports mst */
bool is_mst;
--
1.8.5.5