From 1612c8bd4cef20dd06e8622bb8ab9bbe9f90c0e5 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Tue, 5 May 2015 17:17:34 +0300 Subject: [PATCH] drm/i915: Fix the IBX transcoder B workarounds MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Currently the IBX transcoder B workarounds are not working correctly. Well, the HDMI one seems to be working somewhat, but the DP one is definitely busted. After a bit of experimentation it looks like the best way to make this work is first disable the port on transcoder B, and then re-enable it transcoder A, and immediately disable it again. We can also clean up the code by noting that we can't be called without a valid crtc. And also note that port A on ILK does not need the workaround, so let's check for that one too. Signed-off-by: Ville Syrjälä Reviewed-by: Jesse Barnes Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_dp.c | 37 +++++++++++++---------- drivers/gpu/drm/i915/intel_hdmi.c | 50 ++++++++++++++----------------- drivers/gpu/drm/i915/intel_sdvo.c | 41 ++++++++++--------------- 3 files changed, 60 insertions(+), 68 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index d86e1f951666..abd442af4127 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -3843,6 +3843,7 @@ static void intel_dp_link_down(struct intel_dp *intel_dp) { struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct intel_crtc *crtc = to_intel_crtc(intel_dig_port->base.base.crtc); enum port port = intel_dig_port->port; struct drm_device *dev = intel_dig_port->base.base.dev; struct drm_i915_private *dev_priv = dev->dev_private; @@ -3859,34 +3860,38 @@ intel_dp_link_down(struct intel_dp *intel_dp) if ((IS_GEN7(dev) && port == PORT_A) || (HAS_PCH_CPT(dev) && port != PORT_A)) { DP &= ~DP_LINK_TRAIN_MASK_CPT; - I915_WRITE(intel_dp->output_reg, DP | DP_LINK_TRAIN_PAT_IDLE_CPT); + DP |= DP_LINK_TRAIN_PAT_IDLE_CPT; } else { if (IS_CHERRYVIEW(dev)) DP &= ~DP_LINK_TRAIN_MASK_CHV; else DP &= ~DP_LINK_TRAIN_MASK; - I915_WRITE(intel_dp->output_reg, DP | DP_LINK_TRAIN_PAT_IDLE); + DP |= DP_LINK_TRAIN_PAT_IDLE; } + I915_WRITE(intel_dp->output_reg, DP); POSTING_READ(intel_dp->output_reg); - if (HAS_PCH_IBX(dev) && - I915_READ(intel_dp->output_reg) & DP_PIPEB_SELECT) { - /* Hardware workaround: leaving our transcoder select - * set to transcoder B while it's off will prevent the - * corresponding HDMI output on transcoder A. - * - * Combine this with another hardware workaround: - * transcoder select bit can only be cleared while the - * port is enabled. - */ - DP &= ~DP_PIPEB_SELECT; + DP &= ~(DP_PORT_EN | DP_AUDIO_OUTPUT_ENABLE); + I915_WRITE(intel_dp->output_reg, DP); + POSTING_READ(intel_dp->output_reg); + + /* + * HW workaround for IBX, we need to move the port + * to transcoder A after disabling it to allow the + * matching HDMI port to be enabled on transcoder A. + */ + if (HAS_PCH_IBX(dev) && crtc->pipe == PIPE_B && port != PORT_A) { + /* always enable with pattern 1 (as per spec) */ + DP &= ~(DP_PIPEB_SELECT | DP_LINK_TRAIN_MASK); + DP |= DP_PORT_EN | DP_LINK_TRAIN_PAT_1; + I915_WRITE(intel_dp->output_reg, DP); + POSTING_READ(intel_dp->output_reg); + + DP &= ~DP_PORT_EN; I915_WRITE(intel_dp->output_reg, DP); POSTING_READ(intel_dp->output_reg); } - DP &= ~DP_AUDIO_OUTPUT_ENABLE; - I915_WRITE(intel_dp->output_reg, DP & ~DP_PORT_EN); - POSTING_READ(intel_dp->output_reg); msleep(intel_dp->panel_power_down_delay); } diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c index d148e09db901..fb2dc84e1061 100644 --- a/drivers/gpu/drm/i915/intel_hdmi.c +++ b/drivers/gpu/drm/i915/intel_hdmi.c @@ -873,41 +873,37 @@ static void intel_disable_hdmi(struct intel_encoder *encoder) struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base); struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc); u32 temp; - u32 enable_bits = SDVO_ENABLE | SDVO_AUDIO_ENABLE; if (crtc->config->has_audio) intel_audio_codec_disable(encoder); temp = I915_READ(intel_hdmi->hdmi_reg); - /* HW workaround for IBX, we need to move the port to transcoder A - * before disabling it. */ - if (HAS_PCH_IBX(dev)) { - struct drm_crtc *crtc = encoder->base.crtc; - int pipe = crtc ? to_intel_crtc(crtc)->pipe : -1; - - if (temp & SDVO_PIPE_B_SELECT) { - temp &= ~SDVO_PIPE_B_SELECT; - I915_WRITE(intel_hdmi->hdmi_reg, temp); - POSTING_READ(intel_hdmi->hdmi_reg); - - /* Again we need to write this twice. */ - I915_WRITE(intel_hdmi->hdmi_reg, temp); - POSTING_READ(intel_hdmi->hdmi_reg); - - /* Transcoder selection bits only update - * effectively on vblank. */ - if (crtc) - intel_wait_for_vblank(dev, pipe); - else - msleep(50); - } - } - - temp &= ~enable_bits; - + temp &= ~(SDVO_ENABLE | SDVO_AUDIO_ENABLE); I915_WRITE(intel_hdmi->hdmi_reg, temp); POSTING_READ(intel_hdmi->hdmi_reg); + + /* + * HW workaround for IBX, we need to move the port + * to transcoder A after disabling it to allow the + * matching DP port to be enabled on transcoder A. + */ + if (HAS_PCH_IBX(dev) && crtc->pipe == PIPE_B) { + temp &= ~SDVO_PIPE_B_SELECT; + temp |= SDVO_ENABLE; + /* + * HW workaround, need to write this twice for issue + * that may result in first write getting masked. + */ + I915_WRITE(intel_hdmi->hdmi_reg, temp); + POSTING_READ(intel_hdmi->hdmi_reg); + I915_WRITE(intel_hdmi->hdmi_reg, temp); + POSTING_READ(intel_hdmi->hdmi_reg); + + temp &= ~SDVO_ENABLE; + I915_WRITE(intel_hdmi->hdmi_reg, temp); + POSTING_READ(intel_hdmi->hdmi_reg); + } } static int hdmi_portclock_limit(struct intel_hdmi *hdmi, bool respect_dvi_limit) diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c index e3e9c98eaf52..4a876914f212 100644 --- a/drivers/gpu/drm/i915/intel_sdvo.c +++ b/drivers/gpu/drm/i915/intel_sdvo.c @@ -1437,6 +1437,7 @@ static void intel_disable_sdvo(struct intel_encoder *encoder) { struct drm_i915_private *dev_priv = encoder->base.dev->dev_private; struct intel_sdvo *intel_sdvo = to_sdvo(encoder); + struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc); u32 temp; intel_sdvo_set_active_outputs(intel_sdvo, 0); @@ -1445,32 +1446,22 @@ static void intel_disable_sdvo(struct intel_encoder *encoder) DRM_MODE_DPMS_OFF); temp = I915_READ(intel_sdvo->sdvo_reg); - if ((temp & SDVO_ENABLE) != 0) { - /* HW workaround for IBX, we need to move the port to - * transcoder A before disabling it. */ - if (HAS_PCH_IBX(encoder->base.dev)) { - struct drm_crtc *crtc = encoder->base.crtc; - int pipe = crtc ? to_intel_crtc(crtc)->pipe : -1; - - if (temp & SDVO_PIPE_B_SELECT) { - temp &= ~SDVO_PIPE_B_SELECT; - I915_WRITE(intel_sdvo->sdvo_reg, temp); - POSTING_READ(intel_sdvo->sdvo_reg); - - /* Again we need to write this twice. */ - I915_WRITE(intel_sdvo->sdvo_reg, temp); - POSTING_READ(intel_sdvo->sdvo_reg); - - /* Transcoder selection bits only update - * effectively on vblank. */ - if (crtc) - intel_wait_for_vblank(encoder->base.dev, pipe); - else - msleep(50); - } - } - intel_sdvo_write_sdvox(intel_sdvo, temp & ~SDVO_ENABLE); + temp &= ~SDVO_ENABLE; + intel_sdvo_write_sdvox(intel_sdvo, temp); + + /* + * HW workaround for IBX, we need to move the port + * to transcoder A after disabling it to allow the + * matching DP port to be enabled on transcoder A. + */ + if (HAS_PCH_IBX(dev_priv) && crtc->pipe == PIPE_B) { + temp &= ~SDVO_PIPE_B_SELECT; + temp |= SDVO_ENABLE; + intel_sdvo_write_sdvox(intel_sdvo, temp); + + temp &= ~SDVO_ENABLE; + intel_sdvo_write_sdvox(intel_sdvo, temp); } } -- 2.20.1