From c59053dc58fa3b81ade8e4b411c0e127669c9167 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Jos=C3=A9=20Roberto=20de=20Souza?= Date: Sun, 22 Dec 2019 17:06:51 -0800 Subject: [PATCH] drm/i915/dp: Fix MST disable sequence MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The disable sequence after wait for transcoder off was not correctly implemented. The MST disable sequence is basically the same for HSW, SKL, ICL and TGL, with just minor changes for TGL. With this last patch we finally fixed the hotplugs triggered by MST sinks during the disable/enable sequence, those were causing source to try to do a link training while it was not ready causing CPU pipe FIFO underrrus on TGL. v2: Only unsetting TGL_TRANS_DDI_PORT_MASK for TGL on the post disable sequence v4: Rebased, moved MST sequences to intel_mst_post_disable_dp() BSpec: 4231 BSpec: 4163 BSpec: 22243 BSpec: 49190 Cc: Ville Syrjälä Cc: Lucas De Marchi Reviewed-by: Ville Syrjälä Signed-off-by: José Roberto de Souza Link: https://patchwork.freedesktop.org/patch/msgid/20191223010654.67037-4-jose.souza@intel.com --- drivers/gpu/drm/i915/display/intel_ddi.c | 31 +++++++++++++++++++-------- drivers/gpu/drm/i915/display/intel_dp_mst.c | 33 +++++++++++++++++------------ 2 files changed, 42 insertions(+), 22 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c index c3ac950..3a53878 100644 --- a/drivers/gpu/drm/i915/display/intel_ddi.c +++ b/drivers/gpu/drm/i915/display/intel_ddi.c @@ -34,6 +34,7 @@ #include "intel_ddi.h" #include "intel_display_types.h" #include "intel_dp.h" +#include "intel_dp_mst.h" #include "intel_dp_link_training.h" #include "intel_dpio_phy.h" #include "intel_dsi.h" @@ -1949,17 +1950,18 @@ void intel_ddi_disable_transcoder_func(const struct intel_crtc_state *crtc_state struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc); struct drm_i915_private *dev_priv = to_i915(crtc->base.dev); enum transcoder cpu_transcoder = crtc_state->cpu_transcoder; - i915_reg_t reg = TRANS_DDI_FUNC_CTL(cpu_transcoder); - u32 val = I915_READ(reg); + u32 val; + + val = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder)); + val &= ~TRANS_DDI_FUNC_ENABLE; if (INTEL_GEN(dev_priv) >= 12) { - val &= ~(TRANS_DDI_FUNC_ENABLE | TGL_TRANS_DDI_PORT_MASK | - TRANS_DDI_DP_VC_PAYLOAD_ALLOC); + if (!intel_dp_mst_is_master_trans(crtc_state)) + val &= ~TGL_TRANS_DDI_PORT_MASK; } else { - val &= ~(TRANS_DDI_FUNC_ENABLE | TRANS_DDI_PORT_MASK | - TRANS_DDI_DP_VC_PAYLOAD_ALLOC); + val &= ~TRANS_DDI_PORT_MASK; } - I915_WRITE(reg, val); + I915_WRITE(TRANS_DDI_FUNC_CTL(cpu_transcoder), val); if (dev_priv->quirks & QUIRK_INCREASE_DDI_DISABLED_TIME && intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI)) { @@ -3813,8 +3815,19 @@ static void intel_ddi_post_disable_dp(struct intel_encoder *encoder, */ intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF); - if (INTEL_GEN(dev_priv) < 12 && !is_mst) - intel_ddi_disable_pipe_clock(old_crtc_state); + if (INTEL_GEN(dev_priv) >= 12) { + if (is_mst) { + enum transcoder cpu_transcoder = old_crtc_state->cpu_transcoder; + u32 val; + + val = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder)); + val &= ~TGL_TRANS_DDI_PORT_MASK; + I915_WRITE(TRANS_DDI_FUNC_CTL(cpu_transcoder), val); + } + } else { + if (!is_mst) + intel_ddi_disable_pipe_clock(old_crtc_state); + } intel_disable_ddi_buf(encoder, old_crtc_state); diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c index 8cfff07..9251d47 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c @@ -347,6 +347,7 @@ static void intel_mst_post_disable_dp(struct intel_encoder *encoder, to_intel_connector(old_conn_state->connector); struct drm_i915_private *dev_priv = to_i915(connector->base.dev); bool last_mst_stream; + u32 val; intel_dp->active_mst_links--; last_mst_stream = intel_dp->active_mst_links == 0; @@ -357,6 +358,19 @@ static void intel_mst_post_disable_dp(struct intel_encoder *encoder, intel_disable_pipe(old_crtc_state); + drm_dp_update_payload_part2(&intel_dp->mst_mgr); + + val = I915_READ(TRANS_DDI_FUNC_CTL(old_crtc_state->cpu_transcoder)); + val &= ~TRANS_DDI_DP_VC_PAYLOAD_ALLOC; + I915_WRITE(TRANS_DDI_FUNC_CTL(old_crtc_state->cpu_transcoder), val); + + if (intel_de_wait_for_set(dev_priv, intel_dp->regs.dp_tp_status, + DP_TP_STATUS_ACT_SENT, 1)) + DRM_ERROR("Timed out waiting for ACT sent when disabling\n"); + drm_dp_check_act_status(&intel_dp->mst_mgr); + + drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, connector->port); + intel_ddi_disable_transcoder_func(old_crtc_state); if (INTEL_GEN(dev_priv) >= 9) @@ -365,6 +379,12 @@ static void intel_mst_post_disable_dp(struct intel_encoder *encoder, ironlake_pfit_disable(old_crtc_state); /* + * Power down mst path before disabling the port, otherwise we end + * up getting interrupts from the sink upon detecting link loss. + */ + drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port, + false); + /* * From TGL spec: "If multi-stream slave transcoder: Configure * Transcoder Clock Select to direct no clock to the transcoder" * @@ -374,19 +394,6 @@ static void intel_mst_post_disable_dp(struct intel_encoder *encoder, if (INTEL_GEN(dev_priv) < 12 || !last_mst_stream) intel_ddi_disable_pipe_clock(old_crtc_state); - /* this can fail */ - drm_dp_check_act_status(&intel_dp->mst_mgr); - /* and this can also fail */ - drm_dp_update_payload_part2(&intel_dp->mst_mgr); - - drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, connector->port); - - /* - * Power down mst path before disabling the port, otherwise we end - * up getting interrupts from the sink upon detecting link loss. - */ - drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port, - false); intel_mst->connector = NULL; if (last_mst_stream) -- 2.7.4