On 08/17/2015 08:46 AM, ville.syrj...@linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrj...@linux.intel.com>
>
> Set up the DDI->PLL mapping on SKL also for MST links. Might help make
> MST operational on SKL.
>
> Cc: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
> Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
> ---
> drivers/gpu/drm/i915/intel_ddi.c | 49
> ++++++++++++++++++++++---------------
> drivers/gpu/drm/i915/intel_dp_mst.c | 8 +-----
> drivers/gpu/drm/i915/intel_drv.h | 2 ++
> 3 files changed, 32 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c
> b/drivers/gpu/drm/i915/intel_ddi.c
> index 5dff8b7..10a5a98 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -2258,30 +2258,21 @@ uint32_t ddi_signal_levels(struct intel_dp *intel_dp)
> return DDI_BUF_TRANS_SELECT(level);
> }
>
> -static void intel_ddi_pre_enable(struct intel_encoder *intel_encoder)
> +void intel_ddi_clk_select(struct intel_encoder *encoder,
> + const struct intel_crtc_state *pipe_config)
> {
> - struct drm_encoder *encoder = &intel_encoder->base;
> - struct drm_device *dev = encoder->dev;
> - struct drm_i915_private *dev_priv = dev->dev_private;
> - struct intel_crtc *crtc = to_intel_crtc(encoder->crtc);
> - enum port port = intel_ddi_get_encoder_port(intel_encoder);
> - int type = intel_encoder->type;
> - int hdmi_level;
> -
> - if (type == INTEL_OUTPUT_EDP) {
> - struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
> - intel_edp_panel_on(intel_dp);
> - }
> + struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> + enum port port = intel_ddi_get_encoder_port(encoder);
>
> - if (IS_SKYLAKE(dev)) {
> - uint32_t dpll = crtc->config->ddi_pll_sel;
> + if (IS_SKYLAKE(dev_priv)) {
> + uint32_t dpll = pipe_config->ddi_pll_sel;
> uint32_t val;
>
> /*
> * DPLL0 is used for eDP and is the only "private" DPLL (as
> * opposed to shared) on SKL
> */
> - if (type == INTEL_OUTPUT_EDP) {
> + if (encoder->type == INTEL_OUTPUT_EDP) {
> WARN_ON(dpll != SKL_DPLL0);
>
> val = I915_READ(DPLL_CTRL1);
> @@ -2289,7 +2280,7 @@ static void intel_ddi_pre_enable(struct intel_encoder
> *intel_encoder)
> val &= ~(DPLL_CTRL1_HDMI_MODE(dpll) |
> DPLL_CTRL1_SSC(dpll) |
> DPLL_CTRL1_LINK_RATE_MASK(dpll));
> - val |= crtc->config->dpll_hw_state.ctrl1 << (dpll * 6);
> + val |= pipe_config->dpll_hw_state.ctrl1 << (dpll * 6);
>
> I915_WRITE(DPLL_CTRL1, val);
> POSTING_READ(DPLL_CTRL1);
> @@ -2305,11 +2296,29 @@ static void intel_ddi_pre_enable(struct intel_encoder
> *intel_encoder)
>
> I915_WRITE(DPLL_CTRL2, val);
>
> - } else if (INTEL_INFO(dev)->gen < 9) {
> - WARN_ON(crtc->config->ddi_pll_sel == PORT_CLK_SEL_NONE);
> - I915_WRITE(PORT_CLK_SEL(port), crtc->config->ddi_pll_sel);
> + } else if (INTEL_INFO(dev_priv)->gen < 9) {
> + WARN_ON(pipe_config->ddi_pll_sel == PORT_CLK_SEL_NONE);
> + I915_WRITE(PORT_CLK_SEL(port), pipe_config->ddi_pll_sel);
> + }
> +}
> +
> +static void intel_ddi_pre_enable(struct intel_encoder *intel_encoder)
> +{
> + struct drm_encoder *encoder = &intel_encoder->base;
> + struct drm_device *dev = encoder->dev;
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + struct intel_crtc *crtc = to_intel_crtc(encoder->crtc);
> + enum port port = intel_ddi_get_encoder_port(intel_encoder);
> + int type = intel_encoder->type;
> + int hdmi_level;
> +
> + if (type == INTEL_OUTPUT_EDP) {
> + struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
> + intel_edp_panel_on(intel_dp);
> }
>
> + intel_ddi_clk_select(intel_encoder, crtc->config);
> +
> if (type == INTEL_OUTPUT_DISPLAYPORT || type == INTEL_OUTPUT_EDP) {
> struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
>
> diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c
> b/drivers/gpu/drm/i915/intel_dp_mst.c
> index ebf2054..fd25aeb7 100644
> --- a/drivers/gpu/drm/i915/intel_dp_mst.c
> +++ b/drivers/gpu/drm/i915/intel_dp_mst.c
> @@ -163,20 +163,14 @@ static void intel_mst_pre_enable_dp(struct
> intel_encoder *encoder)
> intel_mst->port = found->port;
>
> if (intel_dp->active_mst_links == 0) {
> - enum port port = intel_ddi_get_encoder_port(encoder);
> + intel_ddi_clk_select(encoder, intel_crtc->config);
>
> intel_dp_set_link_params(intel_dp, intel_crtc->config);
>
> - /* FIXME: add support for SKL */
> - if (INTEL_INFO(dev)->gen < 9)
> - I915_WRITE(PORT_CLK_SEL(port),
> - intel_crtc->config->ddi_pll_sel);
> -
> intel_ddi_init_dp_buf_reg(&intel_dig_port->base);
>
> intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
>
> -
> intel_dp_start_link_train(intel_dp);
> intel_dp_complete_link_train(intel_dp);
> intel_dp_stop_link_train(intel_dp);
> diff --git a/drivers/gpu/drm/i915/intel_drv.h
> b/drivers/gpu/drm/i915/intel_drv.h
> index 71a2e18..a97908a 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -938,6 +938,8 @@ void intel_crt_init(struct drm_device *dev);
>
>
> /* intel_ddi.c */
> +void intel_ddi_clk_select(struct intel_encoder *encoder,
> + const struct intel_crtc_state *pipe_config);
> void intel_prepare_ddi(struct drm_device *dev);
> void hsw_fdi_link_train(struct drm_crtc *crtc);
> void intel_ddi_init(struct drm_device *dev, enum port port);
>
Looks like an improvement over current code and fixes the hard hang in
https://bugs.freedesktop.org/show_bug.cgi?id=91791, so I think we should
push it.
Sounds like we need more than just this to fix MST on SKL though.
Reviewed-by: Jesse Barnes <jbar...@virtuousgeek.org>
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