From 96550555a78ca3c9fda4b358549a5622810fe32c Mon Sep 17 00:00:00 2001 From: Lyude Paul Date: Tue, 15 Jan 2019 15:08:00 -0500 Subject: drm/i915: Pass down rc in intel_encoder->compute_config() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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() Signed-off-by: Lyude Paul Cc: Ville Syrjälä Fixes: eceae1472467 ("drm/dp_mst: Start tracking per-port VCPI allocations") Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=109320 Reviewed-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20190115200800.3121-1-lyude@redhat.com --- drivers/gpu/drm/i915/intel_tv.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'drivers/gpu/drm/i915/intel_tv.c') diff --git a/drivers/gpu/drm/i915/intel_tv.c b/drivers/gpu/drm/i915/intel_tv.c index 860f306a23ba..9bbe35a0f0f2 100644 --- a/drivers/gpu/drm/i915/intel_tv.c +++ b/drivers/gpu/drm/i915/intel_tv.c @@ -870,7 +870,7 @@ intel_tv_get_config(struct intel_encoder *encoder, pipe_config->base.adjusted_mode.crtc_clock = pipe_config->port_clock; } -static bool +static int intel_tv_compute_config(struct intel_encoder *encoder, struct intel_crtc_state *pipe_config, struct drm_connector_state *conn_state) @@ -880,10 +880,10 @@ intel_tv_compute_config(struct intel_encoder *encoder, &pipe_config->base.adjusted_mode; if (!tv_mode) - return false; + return -EINVAL; if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN) - return false; + return -EINVAL; pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB; adjusted_mode->crtc_clock = tv_mode->clock; @@ -898,7 +898,7 @@ intel_tv_compute_config(struct intel_encoder *encoder, * or whether userspace is doing something stupid. */ - return true; + return 0; } static void -- cgit v1.2.3-59-g8ed1b