From 55607e8aaa86e68ed4f37d072ee9af404cc8a830 Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Sun, 16 Jun 2013 21:42:39 +0200 Subject: [PATCH] drm/i915: asserts for lvds pre_enable Lots of bangin my head against the wall^UExperiments have shown that we really need to enable the lvds port before we enable plls. Strangely that seems to include the fdi rx pll on the pch. Note that the pch pll assert can fire since the lvds port has it's own special clock source settings in the DPLL register, which means it will never have a shared dpll (since there's only one LVDS port). Anyway, encode this new evidence with a few nice WARNs. v2: Incorporate review comments from Imre. - Explain why lvds can't have a shared dpll. - Update the WARN output. Cc: Imre Deak Reviewed-by: Imre Deak Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_display.c | 26 +++++++++++++------------- drivers/gpu/drm/i915/intel_drv.h | 16 ++++++++++++++++ drivers/gpu/drm/i915/intel_lvds.c | 17 ++++++++++++----- 3 files changed, 41 insertions(+), 18 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index e0efe4b..66c6e38 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -892,8 +892,8 @@ static const char *state_string(bool enabled) } /* Only for pre-ILK configs */ -static void assert_pll(struct drm_i915_private *dev_priv, - enum pipe pipe, bool state) +void assert_pll(struct drm_i915_private *dev_priv, + enum pipe pipe, bool state) { int reg; u32 val; @@ -906,10 +906,8 @@ static void assert_pll(struct drm_i915_private *dev_priv, "PLL state assertion failure (expected %s, current %s)\n", state_string(state), state_string(cur_state)); } -#define assert_pll_enabled(d, p) assert_pll(d, p, true) -#define assert_pll_disabled(d, p) assert_pll(d, p, false) -static struct intel_shared_dpll * +struct intel_shared_dpll * intel_crtc_to_shared_dpll(struct intel_crtc *crtc) { struct drm_i915_private *dev_priv = crtc->base.dev->dev_private; @@ -921,9 +919,9 @@ intel_crtc_to_shared_dpll(struct intel_crtc *crtc) } /* For ILK+ */ -static void assert_shared_dpll(struct drm_i915_private *dev_priv, - struct intel_shared_dpll *pll, - bool state) +void assert_shared_dpll(struct drm_i915_private *dev_priv, + struct intel_shared_dpll *pll, + bool state) { bool cur_state; struct intel_dpll_hw_state hw_state; @@ -942,8 +940,6 @@ static void assert_shared_dpll(struct drm_i915_private *dev_priv, "%s assertion failure (expected %s, current %s)\n", pll->name, state_string(state), state_string(cur_state)); } -#define assert_shared_dpll_enabled(d, p) assert_shared_dpll(d, p, true) -#define assert_shared_dpll_disabled(d, p) assert_shared_dpll(d, p, false) static void assert_fdi_tx(struct drm_i915_private *dev_priv, enum pipe pipe, bool state) @@ -1007,15 +1003,19 @@ static void assert_fdi_tx_pll_enabled(struct drm_i915_private *dev_priv, WARN(!(val & FDI_TX_PLL_ENABLE), "FDI TX PLL assertion failure, should be active but is disabled\n"); } -static void assert_fdi_rx_pll_enabled(struct drm_i915_private *dev_priv, - enum pipe pipe) +void assert_fdi_rx_pll(struct drm_i915_private *dev_priv, + enum pipe pipe, bool state) { int reg; u32 val; + bool cur_state; reg = FDI_RX_CTL(pipe); val = I915_READ(reg); - WARN(!(val & FDI_RX_PLL_ENABLE), "FDI RX PLL assertion failure, should be active but is disabled\n"); + cur_state = !!(val & FDI_RX_PLL_ENABLE); + WARN(cur_state != state, + "FDI RX PLL assertion failure (expected %s, current %s)\n", + state_string(state), state_string(cur_state)); } static void assert_panel_unlocked(struct drm_i915_private *dev_priv, diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index 8eeee74..6f7f33e 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -747,6 +747,22 @@ extern int intel_overlay_attrs(struct drm_device *dev, void *data, extern void intel_fb_output_poll_changed(struct drm_device *dev); extern void intel_fb_restore_mode(struct drm_device *dev); +struct intel_shared_dpll * +intel_crtc_to_shared_dpll(struct intel_crtc *crtc); + +void assert_shared_dpll(struct drm_i915_private *dev_priv, + struct intel_shared_dpll *pll, + bool state); +#define assert_shared_dpll_enabled(d, p) assert_shared_dpll(d, p, true) +#define assert_shared_dpll_disabled(d, p) assert_shared_dpll(d, p, false) +void assert_pll(struct drm_i915_private *dev_priv, + enum pipe pipe, bool state); +#define assert_pll_enabled(d, p) assert_pll(d, p, true) +#define assert_pll_disabled(d, p) assert_pll(d, p, false) +void assert_fdi_rx_pll(struct drm_i915_private *dev_priv, + enum pipe pipe, bool state); +#define assert_fdi_rx_pll_enabled(d, p) assert_fdi_rx_pll(d, p, true) +#define assert_fdi_rx_pll_disabled(d, p) assert_fdi_rx_pll(d, p, false) extern void assert_pipe(struct drm_i915_private *dev_priv, enum pipe pipe, bool state); #define assert_pipe_enabled(d, p) assert_pipe(d, p, true) diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c index 2abb2d3..a510fa8 100644 --- a/drivers/gpu/drm/i915/intel_lvds.c +++ b/drivers/gpu/drm/i915/intel_lvds.c @@ -120,12 +120,20 @@ static void intel_pre_pll_enable_lvds(struct intel_encoder *encoder) struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base); struct drm_device *dev = encoder->base.dev; struct drm_i915_private *dev_priv = dev->dev_private; - struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc); + struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc); struct drm_display_mode *fixed_mode = lvds_encoder->attached_connector->base.panel.fixed_mode; - int pipe = intel_crtc->pipe; + int pipe = crtc->pipe; u32 temp; + if (HAS_PCH_SPLIT(dev)) { + assert_fdi_rx_pll_disabled(dev_priv, pipe); + assert_shared_dpll_disabled(dev_priv, + intel_crtc_to_shared_dpll(crtc)); + } else { + assert_pll_disabled(dev_priv, pipe); + } + temp = I915_READ(lvds_encoder->reg); temp |= LVDS_PORT_EN | LVDS_A0A2_CLKA_POWER_UP; @@ -142,7 +150,7 @@ static void intel_pre_pll_enable_lvds(struct intel_encoder *encoder) /* set the corresponsding LVDS_BORDER bit */ temp &= ~LVDS_BORDER_ENABLE; - temp |= intel_crtc->config.gmch_pfit.lvds_border_bits; + temp |= crtc->config.gmch_pfit.lvds_border_bits; /* Set the B0-B3 data pairs corresponding to whether we're going to * set the DPLLs for dual-channel mode or not. */ @@ -162,8 +170,7 @@ static void intel_pre_pll_enable_lvds(struct intel_encoder *encoder) if (INTEL_INFO(dev)->gen == 4) { /* Bspec wording suggests that LVDS port dithering only exists * for 18bpp panels. */ - if (intel_crtc->config.dither && - intel_crtc->config.pipe_bpp == 18) + if (crtc->config.dither && crtc->config.pipe_bpp == 18) temp |= LVDS_ENABLE_DITHER; else temp &= ~LVDS_ENABLE_DITHER; -- 2.7.4