| From | Kamal Mostafa <> | Subject | [PATCH 3.19.y-ckt 72/92] drm/i915/dp: there is no audio on port A | Date | Tue, 26 May 2015 08:41:16 -0700 |
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3.19.8-ckt1 -stable review patch. If anyone has any objections, please let me know.
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From: Jani Nikula <jani.nikula@intel.com>
commit 9fcb1704d1d51b12e2f03c78bca013d0cbbb7c98 upstream.
The eDP port A register on PCH split platforms has a slightly different register layout from the other ports, with bit 6 being either alternate scrambler reset or reserved, depending on the generation. Our misinterpretation of the bit as audio has lead to warning.
Fix this by not enabling audio on port A, since none of our platforms support audio on port A anyway.
v2: DDI doesn't have audio on port A either (Sivakumar Thulasimani)
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=89958 Reported-and-tested-by: Chris Bainbridge <chris.bainbridge@gmail.com> Reviewed-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- drivers/gpu/drm/i915/intel_dp.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 9f6c897..00c8ee9 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -1175,7 +1175,7 @@ intel_dp_compute_config(struct intel_encoder *encoder, pipe_config->has_dp_encoder = true; pipe_config->has_drrs = false; - pipe_config->has_audio = intel_dp->has_audio; + pipe_config->has_audio = intel_dp->has_audio && port != PORT_A; if (is_edp(intel_dp) && intel_connector->panel.fixed_mode) { intel_fixed_panel_mode(intel_connector->panel.fixed_mode, @@ -2024,8 +2024,8 @@ static void intel_dp_get_config(struct intel_encoder *encoder, int dotclock; tmp = I915_READ(intel_dp->output_reg); - if (tmp & DP_AUDIO_OUTPUT_ENABLE) - pipe_config->has_audio = true; + + pipe_config->has_audio = tmp & DP_AUDIO_OUTPUT_ENABLE && port != PORT_A; if ((port == PORT_A) || !HAS_PCH_CPT(dev)) { if (tmp & DP_SYNC_HS_HIGH) -- 1.9.1
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