[PATCH v3 25/29] drm/i915: Stop frobbing with DDI encoder->type

Ville Syrjala
2017-09-21T14:56:39Z

Currently the DDI encoder->type will change at runtime depending on
what kind of hotplugs we've processed. That's quite bad since we can't
really trust that that current value of encoder->type actually matches
the type of signal we're trying to drive through it.

Let's eliminate that problem by declaring that non-eDP DDI port will
always have the encoder type as INTEL_OUTPUT_DDI. This means the code
can no longer try to distinguish DP vs. HDMI based on encoder->type.
We'll eDP as INTEL_OUTPUT_EDP, since it'll never change and there's a
bunch of code that relies on that value to identofy eDP.

We'll introduce a new encoder .compute_output_type() hook. This allows
us to compute the full output_types before any encoder .compute_config()
hooks get called, thus those hooks can rely on output_types being
correct, which is useful for cloning on oldr platforms. For now we'll
just look at the connector type and pick the correct mode based on that.
In the future the new hook could be used to implement dynamic switching
between LS and PCON modes for LSPCON.

TODO: maybe make .get_config() populate output_types rather than doing
the default encoder->type thing in caller and then undoing it for
DDI in .get_config().

v2: Fix BXT/GLK PPS explosion with DSI/MST encoders
v3: Avoid the PPS warn on pure HDMI/DVI DDI encoders by checking dp.output_reg

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
drivers/gpu/drm/i915/i915_debugfs.c | 2 +-
drivers/gpu/drm/i915/intel_ddi.c | 50 +++++++++++++++++++++++++++++------
drivers/gpu/drm/i915/intel_display.c | 11 +++++---
drivers/gpu/drm/i915/intel_dp.c | 19 +++++--------
drivers/gpu/drm/i915/intel_drv.h | 7 +++--
drivers/gpu/drm/i915/intel_hdmi.c | 10 ++-----
drivers/gpu/drm/i915/intel_opregion.c | 2 +-
7 files changed, 65 insertions(+), 36 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index ca6fa6d122c6..73601464240d 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -3053,7 +3053,7 @@ static void intel_connector_info(struct seq_file *m,
break;
case DRM_MODE_CONNECTOR_HDMIA:
if (intel_encoder->type == INTEL_OUTPUT_HDMI ||
- intel_encoder->type == INTEL_OUTPUT_UNKNOWN)
+ intel_encoder->type == INTEL_OUTPUT_DDI)
intel_hdmi_info(m, intel_connector);
break;
default:
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index d625bfe6d420..17b9bb80fb09 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -497,10 +497,8 @@ enum port intel_ddi_get_encoder_port(struct intel_encoder *encoder)
switch (encoder->type) {
case INTEL_OUTPUT_DP_MST:
return enc_to_mst(&encoder->base)->primary->port;
- case INTEL_OUTPUT_DP:
case INTEL_OUTPUT_EDP:
- case INTEL_OUTPUT_HDMI:
- case INTEL_OUTPUT_UNKNOWN:
+ case INTEL_OUTPUT_DDI:
return enc_to_dig_port(&encoder->base)->port;
case INTEL_OUTPUT_ANALOG:
return PORT_E;
@@ -1516,6 +1514,7 @@ void intel_ddi_set_vc_payload_alloc(const struct intel_crtc_state *crtc_state,
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
uint32_t temp;
+
temp = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));
if (state == true)
temp |= TRANS_DDI_DP_VC_PAYLOAD_ALLOC;
@@ -2489,6 +2488,13 @@ void intel_ddi_get_config(struct intel_encoder *encoder,
struct intel_digital_port *intel_dig_port;
u32 temp, flags = 0;

+ /*
+ * Can be set by the caller based on encoder->type.
+ * Undo that since we don't want INTEL_OUTPUT_DDI
+ * to appear in output_types.
+ */
+ pipe_config->output_types &= ~BIT(INTEL_OUTPUT_DDI);
+
/* XXX: DSI transcoder paranoia */
if (WARN_ON(transcoder_is_dsi(cpu_transcoder)))
return;
@@ -2537,12 +2543,23 @@ void intel_ddi_get_config(struct intel_encoder *encoder,
pipe_config->hdmi_high_tmds_clock_ratio = true;
/* fall through */
case TRANS_DDI_MODE_SELECT_DVI:
+ pipe_config->output_types |= BIT(INTEL_OUTPUT_HDMI);
pipe_config->lane_count = 4;
break;
case TRANS_DDI_MODE_SELECT_FDI:
+ pipe_config->output_types |= BIT(INTEL_OUTPUT_ANALOG);
break;
case TRANS_DDI_MODE_SELECT_DP_SST:
+ if (encoder->type == INTEL_OUTPUT_EDP)
+ pipe_config->output_types |= BIT(INTEL_OUTPUT_EDP);
+ else
+ pipe_config->output_types |= BIT(INTEL_OUTPUT_DP);
+ pipe_config->lane_count =
+ ((temp & DDI_PORT_WIDTH_MASK) >> DDI_PORT_WIDTH_SHIFT) + 1;
+ intel_dp_get_m_n(intel_crtc, pipe_config);
+ break;
case TRANS_DDI_MODE_SELECT_DP_MST:
+ pipe_config->output_types |= BIT(INTEL_OUTPUT_DP_MST);
pipe_config->lane_count =
((temp & DDI_PORT_WIDTH_MASK) >> DDI_PORT_WIDTH_SHIFT) + 1;
intel_dp_get_m_n(intel_crtc, pipe_config);
@@ -2581,21 +2598,36 @@ void intel_ddi_get_config(struct intel_encoder *encoder,
bxt_ddi_phy_get_lane_lat_optim_mask(encoder);
}

+static enum intel_output_type
+intel_ddi_compute_output_type(struct intel_encoder *encoder,
+ struct intel_crtc_state *crtc_state,
+ struct drm_connector_state *conn_state)
+{
+ switch (conn_state->connector->connector_type) {
+ case DRM_MODE_CONNECTOR_HDMIA:
+ return INTEL_OUTPUT_HDMI;
+ case DRM_MODE_CONNECTOR_eDP:
+ return INTEL_OUTPUT_EDP;
+ case DRM_MODE_CONNECTOR_DisplayPort:
+ return INTEL_OUTPUT_DP;
+ default:
+ MISSING_CASE(conn_state->connector->connector_type);
+ return INTEL_OUTPUT_UNUSED;
+ }
+}
+
static bool intel_ddi_compute_config(struct intel_encoder *encoder,
struct intel_crtc_state *pipe_config,
struct drm_connector_state *conn_state)
{
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
- int type = encoder->type;
int port = intel_ddi_get_encoder_port(encoder);
int ret;

- WARN(type == INTEL_OUTPUT_UNKNOWN, "compute_config() on unknown output!\n");
-
if (port == PORT_A)
pipe_config->cpu_transcoder = TRANSCODER_EDP;

- if (type == INTEL_OUTPUT_HDMI)
+ if (intel_crtc_has_type(pipe_config, INTEL_OUTPUT_HDMI))
ret = intel_hdmi_compute_config(encoder, pipe_config, conn_state);
else
ret = intel_dp_compute_config(encoder, pipe_config, conn_state);
@@ -2715,6 +2747,7 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
drm_encoder_init(&dev_priv->drm, encoder, &intel_ddi_funcs,
DRM_MODE_ENCODER_TMDS, "DDI %c", port_name(port));

+ intel_encoder->compute_output_type = intel_ddi_compute_output_type;
intel_encoder->compute_config = intel_ddi_compute_config;
intel_encoder->enable = intel_enable_ddi;
if (IS_GEN9_LP(dev_priv))
@@ -2772,9 +2805,10 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
}
}

+ intel_dig_port->dp.output_reg = INVALID_MMIO_REG;
intel_dig_port->max_lanes = max_lanes;

- intel_encoder->type = INTEL_OUTPUT_UNKNOWN;
+ intel_encoder->type = INTEL_OUTPUT_DDI;
intel_encoder->power_domain = intel_port_to_power_domain(port);
intel_encoder->port = port;
intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 9221f613643a..18bffb883a65 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -10696,7 +10696,7 @@ static const char * const output_type_str[] = {
OUTPUT_TYPE(DP),
OUTPUT_TYPE(EDP),
OUTPUT_TYPE(DSI),
- OUTPUT_TYPE(UNKNOWN),
+ OUTPUT_TYPE(DDI),
OUTPUT_TYPE(DP_MST),
};

@@ -10867,7 +10867,7 @@ static bool check_digital_port_conflicts(struct drm_atomic_state *state)

switch (encoder->type) {
unsigned int port_mask;
- case INTEL_OUTPUT_UNKNOWN:
+ case INTEL_OUTPUT_DDI:
if (WARN_ON(!HAS_DDI(to_i915(dev))))
break;
case INTEL_OUTPUT_DP:
@@ -11000,7 +11000,12 @@ intel_modeset_pipe_config(struct drm_crtc *crtc,
* Determine output_types before calling the .compute_config()
* hooks so that the hooks can use this information safely.
*/
- pipe_config->output_types |= 1 << encoder->type;
+ if (encoder->compute_output_type)
+ pipe_config->output_types |=
+ BIT(encoder->compute_output_type(encoder, pipe_config,
+ connector_state));
+ else
+ pipe_config->output_types |= BIT(encoder->type);
}

encoder_retry:
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 2ef68d28ea1e..f30fabc802c5 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -769,11 +769,16 @@ void intel_power_sequencer_reset(struct drm_i915_private *dev_priv)
struct intel_dp *intel_dp;

if (encoder->type != INTEL_OUTPUT_DP &&
- encoder->type != INTEL_OUTPUT_EDP)
+ encoder->type != INTEL_OUTPUT_EDP &&
+ encoder->type != INTEL_OUTPUT_DDI)
continue;

intel_dp = enc_to_intel_dp(&encoder->base);

+ /* Skip pure DVI/HDMI DDI encoders */
+ if (!i915_mmio_reg_valid(intel_dp->output_reg))
+ continue;
+
WARN_ON(intel_dp->active_pipe != INVALID_PIPE);

if (encoder->type != INTEL_OUTPUT_EDP)
@@ -4719,8 +4724,6 @@ intel_dp_long_pulse(struct intel_connector *intel_connector)
{
struct drm_connector *connector = &intel_connector->base;
struct intel_dp *intel_dp = intel_attached_dp(connector);
- struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
- struct intel_encoder *intel_encoder = &intel_dig_port->base;
struct drm_device *dev = connector->dev;
enum drm_connector_status status;
u8 sink_irq_vector = 0;
@@ -4753,9 +4756,6 @@ intel_dp_long_pulse(struct intel_connector *intel_connector)
goto out;
}

- if (intel_encoder->type != INTEL_OUTPUT_EDP)
- intel_encoder->type = INTEL_OUTPUT_DP;
-
DRM_DEBUG_KMS("Display Port TPS3 support: source %s, sink %s\n",
yesno(intel_dp_source_supports_hbr2(intel_dp)),
yesno(drm_dp_tps3_supported(intel_dp->dpcd)));
@@ -4876,9 +4876,6 @@ intel_dp_force(struct drm_connector *connector)
intel_dp_set_edid(intel_dp);

intel_display_power_put(dev_priv, intel_dp->aux_power_domain);
-
- if (intel_encoder->type != INTEL_OUTPUT_EDP)
- intel_encoder->type = INTEL_OUTPUT_DP;
}

static int intel_dp_get_modes(struct drm_connector *connector)
@@ -5097,10 +5094,6 @@ intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
struct drm_i915_private *dev_priv = to_i915(dev);
enum irqreturn ret = IRQ_NONE;

- if (intel_dig_port->base.type != INTEL_OUTPUT_EDP &&
- intel_dig_port->base.type != INTEL_OUTPUT_HDMI)
- intel_dig_port->base.type = INTEL_OUTPUT_DP;
-
if (long_hpd && intel_dig_port->base.type == INTEL_OUTPUT_EDP) {
/*
* vdd off can generate a long pulse on eDP which
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 307807672896..6e375d2e052c 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -173,7 +173,7 @@ enum intel_output_type {
INTEL_OUTPUT_DP = 7,
INTEL_OUTPUT_EDP = 8,
INTEL_OUTPUT_DSI = 9,
- INTEL_OUTPUT_UNKNOWN = 10,
+ INTEL_OUTPUT_DDI = 10,
INTEL_OUTPUT_DP_MST = 11,
};

@@ -216,6 +216,9 @@ struct intel_encoder {
enum port port;
unsigned int cloneable;
void (*hot_plug)(struct intel_encoder *);
+ enum intel_output_type (*compute_output_type)(struct intel_encoder *,
+ struct intel_crtc_state *,
+ struct drm_connector_state *);
bool (*compute_config)(struct intel_encoder *,
struct intel_crtc_state *,
struct drm_connector_state *);
@@ -1151,7 +1154,7 @@ enc_to_dig_port(struct drm_encoder *encoder)
struct intel_encoder *intel_encoder = to_intel_encoder(encoder);

switch (intel_encoder->type) {
- case INTEL_OUTPUT_UNKNOWN:
+ case INTEL_OUTPUT_DDI:
WARN_ON(!HAS_DDI(to_i915(encoder->dev)));
case INTEL_OUTPUT_DP:
case INTEL_OUTPUT_EDP:
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index e6f8f30ce7bd..ab8f8d751081 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1604,12 +1604,9 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)

intel_hdmi_unset_edid(connector);

- if (intel_hdmi_set_edid(connector)) {
- struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
-
- hdmi_to_dig_port(intel_hdmi)->base.type = INTEL_OUTPUT_HDMI;
+ if (intel_hdmi_set_edid(connector))
status = connector_status_connected;
- } else
+ else
status = connector_status_disconnected;

intel_display_power_put(dev_priv, POWER_DOMAIN_GMBUS);
@@ -1620,8 +1617,6 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
static void
intel_hdmi_force(struct drm_connector *connector)
{
- struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
-
DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
connector->base.id, connector->name);

@@ -1631,7 +1626,6 @@ intel_hdmi_force(struct drm_connector *connector)
return;

intel_hdmi_set_edid(connector);
- hdmi_to_dig_port(intel_hdmi)->base.type = INTEL_OUTPUT_HDMI;
}

static int intel_hdmi_get_modes(struct drm_connector *connector)
diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
index 98154efcb2f4..d57ade0b652a 100644
--- a/drivers/gpu/drm/i915/intel_opregion.c
+++ b/drivers/gpu/drm/i915/intel_opregion.c
@@ -383,7 +383,7 @@ int intel_opregion_notify_encoder(struct intel_encoder *intel_encoder,
case INTEL_OUTPUT_ANALOG:
type = DISPLAY_TYPE_CRT;
break;