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drm/i915: Pass down rc in intel_encoder->compute_config()

Telusuri Sumber 
Something that I completely missed when implementing the new MST VCPI
atomic helpers is that with those helpers, there's technically a chance
of us having to grab additional modeset locks in ->compute_config() and
furthermore, that means we have the potential to hit a normal modeset
deadlock. However, because ->compute_config() only returns a bool this
means we can't return -EDEADLK when we need to drop locks and try again
which means we end up just failing the atomic check permanently. Whoops.

So, fix this by modifying ->compute_config() to pass down an actual
error code instead of a bool so that the atomic check can be restarted
on modeset deadlocks.

Thanks to Ville Syrjälä for pointing this out!

Changes since v1:
* Add some newlines
* Return only -EINVAL from hsw_crt_compute_config()
* Propogate return code from intel_dp_compute_dsc_params()
* Change all of the intel_dp_compute_link_config*() variants
* Don't miss if (hdmi_port_clock_valid()) branch in
  intel_hdmi_compute_config()

[Cherry-picked from drm-misc-next to drm-intel-next-queued to fix
 linux-next & drm-tip conflict, while waiting for proper propagation of
 the DP MST series that this commit fixes. In hindsight, a topic branch
 might have been a better approach for it.]

Signed-off-by: Lyude Paul <lyude@redhat.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Fixes: eceae14724 ("drm/dp_mst: Start tracking per-port VCPI allocations")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=109320
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190115200800.3121-1-lyude@redhat.com
(cherry picked from commit 96550555a7)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Daniel Vetter <daniel@ffwll.ch>
This commit is contained in:
Lyude Paul
2019-01-15 15:08:00 -05:00
committed by Jani Nikula
orang tua 9e267d286a
melakukan 204474a6b8
13 mengubah file dengan 122 tambahan dan 112 penghapusan
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71
drivers/gpu/drm/i915/intel_dp.c
Melihat File

@@ -1819,7 +1819,7 @@ intel_dp_adjust_compliance_config(struct intel_dp *intel_dp,
}
/* Optimize link config in order: max bpp, min clock, min lanes */
static bool
static int
intel_dp_compute_link_config_wide(struct intel_dp *intel_dp,
struct intel_crtc_state *pipe_config,
const struct link_config_limits *limits)
@@ -1845,17 +1845,17 @@ intel_dp_compute_link_config_wide(struct intel_dp *intel_dp,
pipe_config->pipe_bpp = bpp;
pipe_config->port_clock = link_clock;
return true;
return 0;
}
}
}
}
return false;
return -EINVAL;
}
/* Optimize link config in order: max bpp, min lanes, min clock */
static bool
static int
intel_dp_compute_link_config_fast(struct intel_dp *intel_dp,
struct intel_crtc_state *pipe_config,
const struct link_config_limits *limits)
@@ -1881,13 +1881,13 @@ intel_dp_compute_link_config_fast(struct intel_dp *intel_dp,
pipe_config->pipe_bpp = bpp;
pipe_config->port_clock = link_clock;
return true;
return 0;
}
}
}
}
return false;
return -EINVAL;
}
static int intel_dp_dsc_compute_bpp(struct intel_dp *intel_dp, u8 dsc_max_bpc)
@@ -1905,19 +1905,20 @@ static int intel_dp_dsc_compute_bpp(struct intel_dp *intel_dp, u8 dsc_max_bpc)
return 0;
}
static bool intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
struct intel_crtc_state *pipe_config,
struct drm_connector_state *conn_state,
struct link_config_limits *limits)
static int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
struct intel_crtc_state *pipe_config,
struct drm_connector_state *conn_state,
struct link_config_limits *limits)
{
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
u8 dsc_max_bpc;
int pipe_bpp;
int ret;
if (!intel_dp_supports_dsc(intel_dp, pipe_config))
return false;
return -EINVAL;
dsc_max_bpc = min_t(u8, DP_DSC_MAX_SUPPORTED_BPC,
conn_state->max_requested_bpc);
@@ -1925,7 +1926,7 @@ static bool intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
pipe_bpp = intel_dp_dsc_compute_bpp(intel_dp, dsc_max_bpc);
if (pipe_bpp < DP_DSC_MIN_SUPPORTED_BPC * 3) {
DRM_DEBUG_KMS("No DSC support for less than 8bpc\n");
return false;
return -EINVAL;
}
/*
@@ -1959,7 +1960,7 @@ static bool intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
adjusted_mode->crtc_hdisplay);
if (!dsc_max_output_bpp || !dsc_dp_slice_count) {
DRM_DEBUG_KMS("Compressed BPP/Slice Count not supported\n");
return false;
return -EINVAL;
}
pipe_config->dsc_params.compressed_bpp = min_t(u16,
dsc_max_output_bpp >> 4,
@@ -1976,16 +1977,19 @@ static bool intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
pipe_config->dsc_params.dsc_split = true;
} else {
DRM_DEBUG_KMS("Cannot split stream to use 2 VDSC instances\n");
return false;
return -EINVAL;
}
}
if (intel_dp_compute_dsc_params(intel_dp, pipe_config) < 0) {
ret = intel_dp_compute_dsc_params(intel_dp, pipe_config);
if (ret < 0) {
DRM_DEBUG_KMS("Cannot compute valid DSC parameters for Input Bpp = %d "
"Compressed BPP = %d\n",
pipe_config->pipe_bpp,
pipe_config->dsc_params.compressed_bpp);
return false;
return ret;
}
pipe_config->dsc_params.compression_enable = true;
DRM_DEBUG_KMS("DP DSC computed with Input Bpp = %d "
"Compressed Bpp = %d Slice Count = %d\n",
@@ -1993,10 +1997,10 @@ static bool intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
pipe_config->dsc_params.compressed_bpp,
pipe_config->dsc_params.slice_count);
return true;
return 0;
}
static bool
static int
intel_dp_compute_link_config(struct intel_encoder *encoder,
struct intel_crtc_state *pipe_config,
struct drm_connector_state *conn_state)
@@ -2005,7 +2009,7 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
struct link_config_limits limits;
int common_len;
bool ret;
int ret;
common_len = intel_dp_common_len_rate_limit(intel_dp,
intel_dp->max_link_rate);
@@ -2063,10 +2067,11 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
/* enable compression if the mode doesn't fit available BW */
DRM_DEBUG_KMS("Force DSC en = %d\n", intel_dp->force_dsc_en);
if (!ret || intel_dp->force_dsc_en) {
if (!intel_dp_dsc_compute_config(intel_dp, pipe_config,
conn_state, &limits))
return false;
if (ret || intel_dp->force_dsc_en) {
ret = intel_dp_dsc_compute_config(intel_dp, pipe_config,
conn_state, &limits);
if (ret < 0)
return ret;
}
if (pipe_config->dsc_params.compression_enable) {
@@ -2091,10 +2096,10 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
intel_dp_max_data_rate(pipe_config->port_clock,
pipe_config->lane_count));
}
return true;
return 0;
}
bool
int
intel_dp_compute_config(struct intel_encoder *encoder,
struct intel_crtc_state *pipe_config,
struct drm_connector_state *conn_state)
@@ -2110,6 +2115,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
to_intel_digital_connector_state(conn_state);
bool constant_n = drm_dp_has_quirk(&intel_dp->desc,
DP_DPCD_QUIRK_CONSTANT_N);
int ret;
if (HAS_PCH_SPLIT(dev_priv) && !HAS_DDI(dev_priv) && port != PORT_A)
pipe_config->has_pch_encoder = true;
@@ -2131,8 +2137,6 @@ intel_dp_compute_config(struct intel_encoder *encoder,
adjusted_mode);
if (INTEL_GEN(dev_priv) >= 9) {
int ret;
ret = skl_update_scaler_crtc(pipe_config);
if (ret)
return ret;
@@ -2147,20 +2151,21 @@ intel_dp_compute_config(struct intel_encoder *encoder,
}
if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
return false;
return -EINVAL;
if (HAS_GMCH_DISPLAY(dev_priv) &&
adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE)
return false;
return -EINVAL;
if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK)
return false;
return -EINVAL;
pipe_config->fec_enable = !intel_dp_is_edp(intel_dp) &&
intel_dp_supports_fec(intel_dp, pipe_config);
if (!intel_dp_compute_link_config(encoder, pipe_config, conn_state))
return false;
ret = intel_dp_compute_link_config(encoder, pipe_config, conn_state);
if (ret < 0)
return ret;
if (intel_conn_state->broadcast_rgb == INTEL_BROADCAST_RGB_AUTO) {
/*
@@ -2208,7 +2213,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
intel_psr_compute_config(intel_dp, pipe_config);
return true;
return 0;
}
void intel_dp_set_link_params(struct intel_dp *intel_dp,