[Intel-gfx] [PATCH v2 08/22] drm/i915/fdi: Improve FDI BW sharing between pipe B and C
Imre Deak
imre.deak at intel.com
Thu Aug 24 08:05:03 UTC 2023
At the moment modesetting pipe C on IVB will fail if pipe B uses 4 FDI
lanes. Make the BW sharing more dynamic by trying to reduce pipe B's
link bpp in this case, until pipe B uses only up to 2 FDI lanes.
For this instead of the encoder compute config retry loop - which
reduced link bpp only for the encoder's pipe - check the overall BW
limits after all CRTC states have been computed and if the check fails
reduce the maximum link bpp for a selected pipe (for FDI pipe B or C as
required) and recompute all the CRTC states. Retry this sequence until
either the overall BW limit check passes, or further bpp reduction is
not possible (because all pipes/encoders sharing the link BW reached
their minimum link bpp).
This change also prepares for an upcoming patch resolving BW limits in
a similar way on MST links as well.
v2:
- Rename intel_crtc_state::max_link_bpp to max_link_bpp_x16 and
intel_link_bw_limits::max_bpp to max_bpp_x16. (Jani)
- Increase back pipe B's link bpp if earlier it was limited due to
pipe C and pipe C gets later disabled.
- Don't assume that a CRTC is already in the atomic state, while
reducing its link bpp.
- Add DocBook description to intel_fdi_atomic_check_link().
Cc: Jani Nikula <jani.nikula at linux.intel.com>
Signed-off-by: Imre Deak <imre.deak at intel.com>
---
drivers/gpu/drm/i915/display/g4x_hdmi.c | 5 +-
drivers/gpu/drm/i915/display/intel_atomic.c | 207 ++++++++++++++++++
drivers/gpu/drm/i915/display/intel_atomic.h | 8 +
drivers/gpu/drm/i915/display/intel_crt.c | 7 +
drivers/gpu/drm/i915/display/intel_crtc.c | 1 +
drivers/gpu/drm/i915/display/intel_display.c | 44 ++--
drivers/gpu/drm/i915/display/intel_display.h | 4 +
.../drm/i915/display/intel_display_types.h | 9 +-
drivers/gpu/drm/i915/display/intel_dp.c | 3 +-
drivers/gpu/drm/i915/display/intel_fdi.c | 137 ++++++++++--
drivers/gpu/drm/i915/display/intel_fdi.h | 5 +
drivers/gpu/drm/i915/display/intel_lvds.c | 9 +-
drivers/gpu/drm/i915/display/intel_sdvo.c | 9 +-
13 files changed, 404 insertions(+), 44 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/g4x_hdmi.c b/drivers/gpu/drm/i915/display/g4x_hdmi.c
index 634b14116d9dd..ebbceddc13259 100644
--- a/drivers/gpu/drm/i915/display/g4x_hdmi.c
+++ b/drivers/gpu/drm/i915/display/g4x_hdmi.c
@@ -133,8 +133,11 @@ static int g4x_hdmi_compute_config(struct intel_encoder *encoder,
struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
struct drm_i915_private *i915 = to_i915(encoder->base.dev);
- if (HAS_PCH_SPLIT(i915))
+ if (HAS_PCH_SPLIT(i915)) {
crtc_state->has_pch_encoder = true;
+ if (!intel_atomic_compute_pipe_bpp(crtc_state))
+ return -EINVAL;
+ }
if (IS_G4X(i915))
crtc_state->has_hdmi_sink = g4x_compute_has_hdmi_sink(state, crtc);
diff --git a/drivers/gpu/drm/i915/display/intel_atomic.c b/drivers/gpu/drm/i915/display/intel_atomic.c
index 7cf51dd8c0567..ee4cbf80ddb55 100644
--- a/drivers/gpu/drm/i915/display/intel_atomic.c
+++ b/drivers/gpu/drm/i915/display/intel_atomic.c
@@ -38,6 +38,7 @@
#include "intel_atomic.h"
#include "intel_cdclk.h"
#include "intel_display_types.h"
+#include "intel_fdi.h"
#include "intel_global_state.h"
#include "intel_hdcp.h"
#include "intel_psr.h"
@@ -358,3 +359,209 @@ intel_atomic_get_crtc_state(struct drm_atomic_state *state,
return to_intel_crtc_state(crtc_state);
}
+
+/**
+ * intel_atomic_compute_pipe_bpp - compute pipe bpp limited by max link bpp
+ * @crtc_state: the crtc state
+ *
+ * Compute the pipe bpp limited by the CRTC's maximum link bpp. Encoders can
+ * call this function during state computation in the simple case where the
+ * link bpp will always match the pipe bpp. This is the case for all non-DP
+ * encoders, while DP encoders will use a link bpp lower than pipe bpp in case
+ * of DSC compression.
+ *
+ * Returns %true in case of success, %false if pipe bpp would need to be
+ * reduced below its valid range.
+ */
+bool intel_atomic_compute_pipe_bpp(struct intel_crtc_state *crtc_state)
+{
+ int pipe_bpp = min(crtc_state->pipe_bpp,
+ to_bpp_int(crtc_state->max_link_bpp_x16));
+
+ pipe_bpp = rounddown(pipe_bpp, 2 * 3);
+
+ if (pipe_bpp < 6 * 3)
+ return false;
+
+ crtc_state->pipe_bpp = pipe_bpp;
+
+ return true;
+}
+
+/**
+ * intel_atomic_reduce_link_bpp - reduce maximum link bpp for a selected pipe
+ * @state: atomic state
+ * @limits: link BW limits
+ * @pipe_mask: mask of pipes to select from
+ * @reason: explanation of why bpp reduction is needed
+ *
+ * Select the pipe from @pipe_mask with the biggest link bpp value and set the
+ * maximum of link bpp in @limits below this value. Modeset the selected pipe,
+ * so that its state will get recomputed.
+ *
+ * This function can be called to resolve a link's BW overallocation by reducing
+ * the link bpp of one pipe on the link and hence reducing the total link BW.
+ *
+ * Returns
+ * - 0 in case of success
+ * - %-EINVAL if no pipe can further reduce its link bpp
+ * - Other negative error, if modesetting the selected pipe failed
+ */
+int intel_atomic_reduce_link_bpp(struct intel_atomic_state *state,
+ struct intel_link_bw_limits *limits,
+ u8 pipe_mask,
+ const char *reason)
+{
+ struct drm_i915_private *i915 = to_i915(state->base.dev);
+ enum pipe max_bpp_pipe = INVALID_PIPE;
+ struct intel_crtc *crtc;
+ int max_bpp = 0;
+
+ for_each_intel_crtc_in_pipe_mask(&i915->drm, crtc, pipe_mask) {
+ struct intel_crtc_state *crtc_state;
+ int pipe_bpp;
+
+ if (limits->min_bpp_pipes & BIT(crtc->pipe))
+ continue;
+
+ crtc_state = intel_atomic_get_crtc_state(&state->base,
+ crtc);
+ if (IS_ERR(crtc_state))
+ return PTR_ERR(crtc_state);
+
+ if (crtc_state->dsc.compression_enable)
+ pipe_bpp = crtc_state->dsc.compressed_bpp;
+ else
+ pipe_bpp = crtc_state->pipe_bpp;
+
+ if (pipe_bpp > max_bpp) {
+ max_bpp = pipe_bpp;
+ max_bpp_pipe = crtc->pipe;
+ }
+ }
+
+ if (max_bpp_pipe == INVALID_PIPE)
+ return -EINVAL;
+
+ limits->max_bpp_x16[max_bpp_pipe] = to_bpp_x16(max_bpp) - 1;
+
+ return intel_modeset_pipes_in_mask(state, reason,
+ BIT(max_bpp_pipe), false);
+}
+
+static int intel_atomic_check_link(struct intel_atomic_state *state,
+ struct intel_link_bw_limits *limits)
+{
+ int ret;
+
+ ret = intel_fdi_atomic_check_link(state, limits);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static bool
+assert_link_limit_change_valid(struct drm_i915_private *i915,
+ const struct intel_link_bw_limits *old_limits,
+ const struct intel_link_bw_limits *new_limits)
+{
+ bool bpps_changed = false;
+ enum pipe pipe;
+
+ for_each_pipe(i915, pipe) {
+ /* The bpp limit can only decrease. */
+ if (drm_WARN_ON(&i915->drm,
+ new_limits->max_bpp_x16[pipe] >
+ old_limits->max_bpp_x16[pipe]))
+ return false;
+
+ if (new_limits->max_bpp_x16[pipe] <
+ old_limits->max_bpp_x16[pipe])
+ bpps_changed = true;
+ }
+
+ if (drm_WARN_ON(&i915->drm,
+ !bpps_changed))
+ return false;
+
+ return true;
+}
+
+static bool
+reset_link_bpp_limit_to_min(struct intel_atomic_state *state,
+ const struct intel_link_bw_limits *old_limits,
+ struct intel_link_bw_limits *new_limits,
+ enum pipe failed_pipe)
+{
+ if (failed_pipe == INVALID_PIPE)
+ return false;
+
+ if (new_limits->min_bpp_pipes & BIT(failed_pipe))
+ return false;
+
+ if (new_limits->max_bpp_x16[failed_pipe] ==
+ old_limits->max_bpp_x16[failed_pipe])
+ return false;
+
+ new_limits->max_bpp_x16[failed_pipe] =
+ old_limits->max_bpp_x16[failed_pipe];
+ new_limits->min_bpp_pipes |= BIT(failed_pipe);
+
+ return true;
+}
+
+/**
+ * intel_atomic_check_config_and_link - compute CRTC configs, resolving any BW limits
+ * @state: atomic state
+ *
+ * Compute the configuration of all CRTCs in @state and resolve any BW
+ * limitations on links shared by these CRTCs.
+ *
+ * Return 0 in case of success, or a negative error code otherwise.
+ */
+int intel_atomic_check_config_and_link(struct intel_atomic_state *state)
+{
+ struct drm_i915_private *i915 = to_i915(state->base.dev);
+ struct intel_link_bw_limits new_limits = {};
+ struct intel_link_bw_limits old_limits;
+ enum pipe pipe;
+ int ret;
+
+ for_each_pipe(i915, pipe)
+ new_limits.max_bpp_x16[pipe] = INT_MAX;
+
+ old_limits = new_limits;
+
+ while (true) {
+ enum pipe failed_pipe;
+
+ ret = intel_atomic_check_config(state, &new_limits,
+ &failed_pipe);
+ if (ret) {
+ if (ret == -EINVAL &&
+ reset_link_bpp_limit_to_min(state,
+ &old_limits,
+ &new_limits,
+ failed_pipe))
+ continue;
+
+ break;
+ }
+
+ old_limits = new_limits;
+
+ ret = intel_atomic_check_link(state, &new_limits);
+ if (ret != -EAGAIN)
+ break;
+
+ if (!assert_link_limit_change_valid(i915,
+ &old_limits,
+ &new_limits)) {
+ ret = -EINVAL;
+ break;
+ }
+ }
+
+ return ret;
+}
diff --git a/drivers/gpu/drm/i915/display/intel_atomic.h b/drivers/gpu/drm/i915/display/intel_atomic.h
index e506f6a873447..bbf3595d52c41 100644
--- a/drivers/gpu/drm/i915/display/intel_atomic.h
+++ b/drivers/gpu/drm/i915/display/intel_atomic.h
@@ -20,6 +20,7 @@ struct intel_atomic_state;
struct intel_connector;
struct intel_crtc;
struct intel_crtc_state;
+struct intel_link_bw_limits;
int intel_digital_connector_atomic_get_property(struct drm_connector *connector,
const struct drm_connector_state *state,
@@ -52,4 +53,11 @@ struct intel_crtc_state *
intel_atomic_get_crtc_state(struct drm_atomic_state *state,
struct intel_crtc *crtc);
+int intel_atomic_reduce_link_bpp(struct intel_atomic_state *state,
+ struct intel_link_bw_limits *limits,
+ u8 pipe_mask,
+ const char *reason);
+bool intel_atomic_compute_pipe_bpp(struct intel_crtc_state *crtc_state);
+int intel_atomic_check_config_and_link(struct intel_atomic_state *state);
+
#endif /* __INTEL_ATOMIC_H__ */
diff --git a/drivers/gpu/drm/i915/display/intel_crt.c b/drivers/gpu/drm/i915/display/intel_crt.c
index f66340b4caf0f..3322080a574e8 100644
--- a/drivers/gpu/drm/i915/display/intel_crt.c
+++ b/drivers/gpu/drm/i915/display/intel_crt.c
@@ -36,6 +36,7 @@
#include "i915_drv.h"
#include "i915_irq.h"
#include "i915_reg.h"
+#include "intel_atomic.h"
#include "intel_connector.h"
#include "intel_crt.h"
#include "intel_crtc.h"
@@ -413,6 +414,9 @@ static int pch_crt_compute_config(struct intel_encoder *encoder,
return -EINVAL;
pipe_config->has_pch_encoder = true;
+ if (!intel_atomic_compute_pipe_bpp(pipe_config))
+ return -EINVAL;
+
pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
return 0;
@@ -435,6 +439,9 @@ static int hsw_crt_compute_config(struct intel_encoder *encoder,
return -EINVAL;
pipe_config->has_pch_encoder = true;
+ if (!intel_atomic_compute_pipe_bpp(pipe_config))
+ return -EINVAL;
+
pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
/* LPT FDI RX only supports 8bpc. */
diff --git a/drivers/gpu/drm/i915/display/intel_crtc.c b/drivers/gpu/drm/i915/display/intel_crtc.c
index 182c6dd64f47c..1eda6a9f19aa8 100644
--- a/drivers/gpu/drm/i915/display/intel_crtc.c
+++ b/drivers/gpu/drm/i915/display/intel_crtc.c
@@ -175,6 +175,7 @@ void intel_crtc_state_reset(struct intel_crtc_state *crtc_state,
crtc_state->hsw_workaround_pipe = INVALID_PIPE;
crtc_state->scaler_state.scaler_id = -1;
crtc_state->mst_master_transcoder = INVALID_TRANSCODER;
+ crtc_state->max_link_bpp_x16 = INT_MAX;
}
static struct intel_crtc *intel_crtc_alloc(void)
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index dbf109a2e738f..32778bd01bb05 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -4641,7 +4641,8 @@ intel_crtc_prepare_cleared_state(struct intel_atomic_state *state,
static int
intel_modeset_pipe_config(struct intel_atomic_state *state,
- struct intel_crtc *crtc)
+ struct intel_crtc *crtc,
+ const struct intel_link_bw_limits *limits)
{
struct drm_i915_private *i915 = to_i915(crtc->base.dev);
struct intel_crtc_state *crtc_state =
@@ -4650,7 +4651,6 @@ intel_modeset_pipe_config(struct intel_atomic_state *state,
struct drm_connector_state *connector_state;
int pipe_src_w, pipe_src_h;
int base_bpp, ret, i;
- bool retry = true;
crtc_state->cpu_transcoder = (enum transcoder) crtc->pipe;
@@ -4673,6 +4673,17 @@ intel_modeset_pipe_config(struct intel_atomic_state *state,
if (ret)
return ret;
+ crtc_state->max_link_bpp_x16 = limits->max_bpp_x16[crtc->pipe];
+
+ if (crtc_state->pipe_bpp > to_bpp_int(crtc_state->max_link_bpp_x16)) {
+ drm_dbg_kms(&i915->drm,
+ "[CRTC:%d:%s] Link bpp limited to %d.%04d\n",
+ crtc->base.base.id, crtc->base.name,
+ to_bpp_int(crtc_state->max_link_bpp_x16),
+ to_bpp_frac_dec(crtc_state->max_link_bpp_x16));
+ crtc_state->bw_constrained = true;
+ }
+
base_bpp = crtc_state->pipe_bpp;
/*
@@ -4714,7 +4725,6 @@ intel_modeset_pipe_config(struct intel_atomic_state *state,
crtc_state->output_types |= BIT(encoder->type);
}
-encoder_retry:
/* Ensure the port clock defaults are reset when retrying. */
crtc_state->port_clock = 0;
crtc_state->pixel_multiplier = 1;
@@ -4754,17 +4764,6 @@ intel_modeset_pipe_config(struct intel_atomic_state *state,
ret = intel_crtc_compute_config(state, crtc);
if (ret == -EDEADLK)
return ret;
- if (ret == -EAGAIN) {
- if (drm_WARN(&i915->drm, !retry,
- "[CRTC:%d:%s] loop in pipe configuration computation\n",
- crtc->base.base.id, crtc->base.name))
- return -EINVAL;
-
- drm_dbg_kms(&i915->drm, "[CRTC:%d:%s] bw constrained, retrying\n",
- crtc->base.base.id, crtc->base.name);
- retry = false;
- goto encoder_retry;
- }
if (ret < 0) {
drm_dbg_kms(&i915->drm, "[CRTC:%d:%s] config failure: %d\n",
crtc->base.base.id, crtc->base.name, ret);
@@ -6206,7 +6205,9 @@ static int intel_bigjoiner_add_affected_crtcs(struct intel_atomic_state *state)
return 0;
}
-static int intel_atomic_check_config(struct intel_atomic_state *state)
+int intel_atomic_check_config(struct intel_atomic_state *state,
+ struct intel_link_bw_limits *limits,
+ enum pipe *failed_pipe)
{
struct drm_i915_private *i915 = to_i915(state->base.dev);
struct intel_crtc_state *new_crtc_state;
@@ -6214,10 +6215,16 @@ static int intel_atomic_check_config(struct intel_atomic_state *state)
int ret;
int i;
+ *failed_pipe = INVALID_PIPE;
+
ret = intel_bigjoiner_add_affected_crtcs(state);
if (ret)
return ret;
+ ret = intel_fdi_add_affected_crtcs(state);
+ if (ret)
+ return ret;
+
for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
if (!intel_crtc_needs_modeset(new_crtc_state)) {
if (intel_crtc_is_bigjoiner_slave(new_crtc_state))
@@ -6239,7 +6246,7 @@ static int intel_atomic_check_config(struct intel_atomic_state *state)
if (!new_crtc_state->hw.enable)
continue;
- ret = intel_modeset_pipe_config(state, crtc);
+ ret = intel_modeset_pipe_config(state, crtc, limits);
if (ret)
break;
@@ -6248,6 +6255,9 @@ static int intel_atomic_check_config(struct intel_atomic_state *state)
break;
}
+ if (ret)
+ *failed_pipe = crtc->pipe;
+
return ret;
}
@@ -6295,7 +6305,7 @@ int intel_atomic_check(struct drm_device *dev,
return ret;
}
- ret = intel_atomic_check_config(state);
+ ret = intel_atomic_check_config_and_link(state);
if (ret)
goto fail;
diff --git a/drivers/gpu/drm/i915/display/intel_display.h b/drivers/gpu/drm/i915/display/intel_display.h
index d9a54610d9d5e..2e0535739bd70 100644
--- a/drivers/gpu/drm/i915/display/intel_display.h
+++ b/drivers/gpu/drm/i915/display/intel_display.h
@@ -55,6 +55,7 @@ struct intel_digital_port;
struct intel_dp;
struct intel_encoder;
struct intel_initial_plane_config;
+struct intel_link_bw_limits;
struct intel_link_m_n;
struct intel_plane;
struct intel_plane_state;
@@ -391,6 +392,9 @@ enum phy_fia {
(new_connector_state) = to_intel_digital_connector_state((__state)->base.connectors[__i].new_state), 1))
int intel_atomic_check(struct drm_device *dev, struct drm_atomic_state *state);
+int intel_atomic_check_config(struct intel_atomic_state *state,
+ struct intel_link_bw_limits *limits,
+ enum pipe *failed_pipe);
int intel_atomic_add_affected_planes(struct intel_atomic_state *state,
struct intel_crtc *crtc);
u8 intel_calc_active_pipes(struct intel_atomic_state *state,
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index b143085b399eb..6f4f46658df22 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -66,6 +66,12 @@ struct intel_tc_port;
* Display related stuff
*/
+struct intel_link_bw_limits {
+ u8 min_bpp_pipes;
+ /* in 1/16 bpp units */
+ int max_bpp_x16[I915_MAX_PIPES];
+};
+
/* these are outputs from the chip - integrated only
external chips are via DVO or SDVO output */
enum intel_output_type {
@@ -1189,7 +1195,8 @@ struct intel_crtc_state {
u32 ctrl, div;
} dsi_pll;
- int pipe_bpp;
+ int max_link_bpp_x16; /* in 1/16 bpp units */
+ int pipe_bpp; /* in 1 bpp units */
struct intel_link_m_n dp_m_n;
/* m2_n2 for eDP downclock */
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 6637bd4768bf7..48f005932ad8b 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -2218,7 +2218,8 @@ intel_dp_compute_config_link_bpp_limits(struct intel_dp *intel_dp,
const struct intel_encoder *encoder = &dp_to_dig_port(intel_dp)->base;
int max_link_bpp_x16;
- max_link_bpp_x16 = to_bpp_x16(limits->pipe.max_bpp);
+ max_link_bpp_x16 = min(crtc_state->max_link_bpp_x16,
+ to_bpp_x16(limits->pipe.max_bpp));
if (!dsc) {
max_link_bpp_x16 = rounddown(max_link_bpp_x16, to_bpp_x16(2 * 3));
diff --git a/drivers/gpu/drm/i915/display/intel_fdi.c b/drivers/gpu/drm/i915/display/intel_fdi.c
index e12b46a84fa11..123ba67f68791 100644
--- a/drivers/gpu/drm/i915/display/intel_fdi.c
+++ b/drivers/gpu/drm/i915/display/intel_fdi.c
@@ -119,6 +119,59 @@ void intel_fdi_link_train(struct intel_crtc *crtc,
dev_priv->display.funcs.fdi->fdi_link_train(crtc, crtc_state);
}
+/**
+ * intel_fdi_add_affected_crtcs - add CRTCs on FDI affected by other modeset CRTCs
+ * @state: intel atomic state
+ *
+ * Add a CRTC using FDI to @state if changing another CRTC's FDI BW usage is
+ * known to affect the available FDI BW for the former CRTC. In practice this
+ * means adding CRTC B on IVYBRIDGE if its use of FDI lanes is limited (by
+ * CRTC C) and CRTC C is getting disabled.
+ *
+ * Returns 0 in case of success, or a negative error code otherwise.
+ */
+int intel_fdi_add_affected_crtcs(struct intel_atomic_state *state)
+{
+ struct drm_i915_private *i915 = to_i915(state->base.dev);
+ struct intel_crtc_state *old_crtc_state;
+ struct intel_crtc_state *new_crtc_state;
+ struct intel_crtc *crtc;
+
+ if (!IS_IVYBRIDGE(i915))
+ return 0;
+
+ crtc = intel_crtc_for_pipe(i915, PIPE_C);
+ new_crtc_state = intel_atomic_get_new_crtc_state(state, crtc);
+
+ if (!new_crtc_state)
+ return 0;
+
+ old_crtc_state = intel_atomic_get_new_crtc_state(state, crtc);
+
+ if (!old_crtc_state->fdi_lanes)
+ return 0;
+
+ if (!intel_crtc_needs_modeset(new_crtc_state))
+ return 0;
+
+ if (new_crtc_state->uapi.enable)
+ return 0;
+
+ crtc = intel_crtc_for_pipe(i915, PIPE_B);
+ new_crtc_state = intel_atomic_get_crtc_state(&state->base, crtc);
+
+ if (IS_ERR(new_crtc_state))
+ return PTR_ERR(old_crtc_state);
+
+ old_crtc_state = intel_atomic_get_old_crtc_state(state, crtc);
+ if (!old_crtc_state->fdi_lanes)
+ return 0;
+
+ return intel_modeset_pipes_in_mask(state,
+ "FDI link BW decrease on pipe C",
+ BIT(PIPE_B), false);
+}
+
/* units of 100MHz */
static int pipe_required_fdi_lanes(struct intel_crtc_state *crtc_state)
{
@@ -129,13 +182,16 @@ static int pipe_required_fdi_lanes(struct intel_crtc_state *crtc_state)
}
static int ilk_check_fdi_lanes(struct drm_device *dev, enum pipe pipe,
- struct intel_crtc_state *pipe_config)
+ struct intel_crtc_state *pipe_config,
+ enum pipe *pipe_to_reduce)
{
struct drm_i915_private *dev_priv = to_i915(dev);
struct drm_atomic_state *state = pipe_config->uapi.state;
struct intel_crtc *other_crtc;
struct intel_crtc_state *other_crtc_state;
+ *pipe_to_reduce = pipe;
+
drm_dbg_kms(&dev_priv->drm,
"checking fdi config on pipe %c, lanes %i\n",
pipe_name(pipe), pipe_config->fdi_lanes);
@@ -198,6 +254,9 @@ static int ilk_check_fdi_lanes(struct drm_device *dev, enum pipe pipe,
if (pipe_required_fdi_lanes(other_crtc_state) > 2) {
drm_dbg_kms(&dev_priv->drm,
"fdi link B uses too many lanes to enable link C\n");
+
+ *pipe_to_reduce = PIPE_B;
+
return -EINVAL;
}
return 0;
@@ -238,10 +297,8 @@ int ilk_fdi_compute_config(struct intel_crtc *crtc,
struct drm_device *dev = crtc->base.dev;
struct drm_i915_private *i915 = to_i915(dev);
const struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode;
- int lane, link_bw, fdi_dotclock, ret;
- bool needs_recompute = false;
+ int lane, link_bw, fdi_dotclock;
-retry:
/* FDI is a binary signal running at ~2.7GHz, encoding
* each output octet as 10 bits. The actual frequency
* is stored as a divider into a 100MHz clock, and the
@@ -261,25 +318,69 @@ int ilk_fdi_compute_config(struct intel_crtc *crtc,
intel_link_compute_m_n(pipe_config->pipe_bpp, lane, fdi_dotclock,
link_bw, &pipe_config->fdi_m_n, false);
- ret = ilk_check_fdi_lanes(dev, crtc->pipe, pipe_config);
- if (ret == -EDEADLK)
+ return 0;
+}
+
+static int intel_fdi_atomic_check_bw(struct intel_atomic_state *state,
+ struct intel_crtc *crtc,
+ struct intel_crtc_state *pipe_config,
+ struct intel_link_bw_limits *limits)
+{
+ struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+ enum pipe pipe_to_reduce;
+ int ret;
+
+ ret = ilk_check_fdi_lanes(&i915->drm, crtc->pipe, pipe_config,
+ &pipe_to_reduce);
+ if (ret != -EINVAL)
return ret;
- if (ret == -EINVAL && pipe_config->pipe_bpp > 6*3) {
- pipe_config->pipe_bpp -= 2*3;
- drm_dbg_kms(&i915->drm,
- "fdi link bw constraint, reducing pipe bpp to %i\n",
- pipe_config->pipe_bpp);
- needs_recompute = true;
- pipe_config->bw_constrained = true;
+ ret = intel_atomic_reduce_link_bpp(state, limits,
+ BIT(pipe_to_reduce),
+ "FDI link BW");
- goto retry;
- }
+ return ret ? : -EAGAIN;
+}
- if (needs_recompute)
- return -EAGAIN;
+/**
+ * intel_fdi_atomic_check_link - check all modeset FDI link configuration
+ * @state: intel atomic state
+ * @limits: link BW limits
+ *
+ * Check the link configuration for all modeset FDI outputs. If the
+ * configuration is invalid @limits will be updated if possible to
+ * reduce the total BW, after which the configuration for all CRTCs in
+ * @state must be recomputed with the updated @limits.
+ *
+ * Returns:
+ * - 0 if the confugration is valid
+ * - %-EAGAIN, if the configuration is invalid and @limits got updated
+ * with fallback values with which the configuration of all CRTCs
+ * in @state must be recomputed
+ * - Other negative error, if the configuration is invalid without a
+ * fallback possibility, or the check failed for another reason
+ */
+int intel_fdi_atomic_check_link(struct intel_atomic_state *state,
+ struct intel_link_bw_limits *limits)
+{
+ struct intel_crtc *crtc;
+ struct intel_crtc_state *crtc_state;
+ int i;
+
+ for_each_new_intel_crtc_in_state(state, crtc, crtc_state, i) {
+ int ret;
- return ret;
+ if (!crtc_state->has_pch_encoder ||
+ !intel_crtc_needs_modeset(crtc_state) ||
+ !crtc_state->hw.enable)
+ continue;
+
+ ret = intel_fdi_atomic_check_bw(state, crtc, crtc_state, limits);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
}
static void cpt_set_fdi_bc_bifurcation(struct drm_i915_private *dev_priv, bool enable)
diff --git a/drivers/gpu/drm/i915/display/intel_fdi.h b/drivers/gpu/drm/i915/display/intel_fdi.h
index 1cdb86172702f..eb02b967bb440 100644
--- a/drivers/gpu/drm/i915/display/intel_fdi.h
+++ b/drivers/gpu/drm/i915/display/intel_fdi.h
@@ -8,14 +8,19 @@
enum pipe;
struct drm_i915_private;
+struct intel_atomic_state;
struct intel_crtc;
struct intel_crtc_state;
struct intel_encoder;
+struct intel_link_bw_limits;
+int intel_fdi_add_affected_crtcs(struct intel_atomic_state *state);
int intel_fdi_link_freq(struct drm_i915_private *i915,
const struct intel_crtc_state *pipe_config);
int ilk_fdi_compute_config(struct intel_crtc *intel_crtc,
struct intel_crtc_state *pipe_config);
+int intel_fdi_atomic_check_link(struct intel_atomic_state *state,
+ struct intel_link_bw_limits *limits);
void intel_fdi_normal_train(struct intel_crtc *crtc);
void ilk_fdi_disable(struct intel_crtc *crtc);
void ilk_fdi_pll_disable(struct intel_crtc *intel_crtc);
diff --git a/drivers/gpu/drm/i915/display/intel_lvds.c b/drivers/gpu/drm/i915/display/intel_lvds.c
index 3ace56979b70e..08dcc2d10a2c1 100644
--- a/drivers/gpu/drm/i915/display/intel_lvds.c
+++ b/drivers/gpu/drm/i915/display/intel_lvds.c
@@ -425,6 +425,12 @@ static int intel_lvds_compute_config(struct intel_encoder *encoder,
return -EINVAL;
}
+ if (HAS_PCH_SPLIT(i915)) {
+ crtc_state->has_pch_encoder = true;
+ if (!intel_atomic_compute_pipe_bpp(crtc_state))
+ return -EINVAL;
+ }
+
if (lvds_encoder->a3_power == LVDS_A3_POWER_UP)
lvds_bpp = 8*3;
else
@@ -453,9 +459,6 @@ static int intel_lvds_compute_config(struct intel_encoder *encoder,
if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
return -EINVAL;
- if (HAS_PCH_SPLIT(i915))
- crtc_state->has_pch_encoder = true;
-
ret = intel_panel_fitting(crtc_state, conn_state);
if (ret)
return ret;
diff --git a/drivers/gpu/drm/i915/display/intel_sdvo.c b/drivers/gpu/drm/i915/display/intel_sdvo.c
index 7d25a64698e2f..1c6330151f4d6 100644
--- a/drivers/gpu/drm/i915/display/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/display/intel_sdvo.c
@@ -1352,14 +1352,17 @@ static int intel_sdvo_compute_config(struct intel_encoder *encoder,
struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode;
struct drm_display_mode *mode = &pipe_config->hw.mode;
+ if (HAS_PCH_SPLIT(to_i915(encoder->base.dev))) {
+ pipe_config->has_pch_encoder = true;
+ if (!intel_atomic_compute_pipe_bpp(pipe_config))
+ return -EINVAL;
+ }
+
DRM_DEBUG_KMS("forcing bpc to 8 for SDVO\n");
pipe_config->pipe_bpp = 8*3;
pipe_config->sink_format = INTEL_OUTPUT_FORMAT_RGB;
pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
- if (HAS_PCH_SPLIT(to_i915(encoder->base.dev)))
- pipe_config->has_pch_encoder = true;
-
/*
* We need to construct preferred input timings based on our
* output timings. To do that, we have to set the output
--
2.37.2
More information about the Intel-gfx
mailing list