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drm/i915: Unbreak check_digital_port_conflicts() 

Atomic changes broke check_digital_port_conflicts(). It needs to look
at the global situation instead of just trying to find a conflict
within the current atomic state.

This bug made my HSW explode spectacularly after I had split the DDI
encoders into separate DP and HDMI encoders. With the fix, things
seem much more solid.

I hope holding the connection_mutex is enough protection that we can
actually walk the connectors even if they're not part of the current
atomic state...

v2: Regenerate the patch so that it actually applies (Jani)

Cc: stable@vger.kernel.org
Cc: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Fixes: 5448a00d3f ("drm/i915: Don't use staged config in check_digital_port_conflicts()")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1449764551-12466-1-git-send-email-ville.syrjala@linux.intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Ville Syrjälä 2015-12-10 18:22:31 +02:00 committed by Jani Nikula
parent 152b22627c
commit 0bff485865
1 changed files with 8 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/gpu/drm/i915/intel_display.c
View File

@ -12270,18 +12270,22 @@ static void intel_dump_pipe_config(struct intel_crtc *crtc,
static bool check_digital_port_conflicts(struct drm_atomic_state *state)
{
struct drm_device *dev = state->dev;
struct intel_encoder *encoder;
struct drm_connector *connector;
struct drm_connector_state *connector_state;
unsigned int used_ports = 0;
int i;
/*
* Walk the connector list instead of the encoder
* list to detect the problem on ddi platforms
* where there's just one encoder per digital port.
*/
for_each_connector_in_state(state, connector, connector_state, i) {
drm_for_each_connector(connector, dev) {
struct drm_connector_state *connector_state;
struct intel_encoder *encoder;
connector_state = drm_atomic_get_existing_connector_state(state, connector);
if (!connector_state)
connector_state = connector->state;
if (!connector_state->best_encoder)
continue;