From 049456416f74a4a66d058cf9a46075f0051c6383 Mon Sep 17 00:00:00 2001 From: Paulo Zanoni Date: Thu, 1 Nov 2012 21:00:59 -0200 Subject: [PATCH] drm/i915: fix Haswell FDI link training code This commit makes hsw_fdi_link_train responsible for implementing everything described in the "Enable and train FDI" section from the Hawell CRT mode set sequence documentation. We completely rewrite hsw_fdi_link_train to match the documentation and we also call it in the right place. This patch was initially sent as a series of tiny patches fixing every little problem of the function, but since there were too many patches fixing the same function it got a little difficult to get the "big picture" of how the function would be in the end, so here we amended all the patches into a single big patch fixing the whole function. Problems we fixed: 1 - Train Haswell FDI at the right time. We need to train the FDI before enabling the pipes and planes, so we're moving the call from lpt_pch_enable to haswell_crtc_enable directly. We are also removing ironlake_fdi_pll_enable since the PLL enablement on Haswell is completely different and is also done during the link training steps. 2 - Use the right FDI_RX_CTL register on Haswell There is only one PCH transcoder, so it's always _FDI_RXA_CTL. Using "pipe" here is wrong. 3 - Don't rely on DDI_BUF_CTL previous values Just set the bits we want, everything else is zero. Also POSTING_READ the register before sleeping. 4 - Program the FDI RX TUSIZE register on hsw_fdi_link_train According to the mode set sequence documentation, this is the right place. According to the FDI_RX_TUSIZE register description, this is the value we should set. Also remove the code that sets this register from the old location: lpt_pch_enable. 5 - Properly program FDI_RX_MISC pwrdn lane values on HSW 6 - Wait only 35us for the FDI link training First we wait 30us for the FDI receiver lane calibration, then we wait 5us for the FDI auto training time. 7 - Remove an useless indentation level on hsw_fdi_link_train We already "break" when the link training succeeds. 8 - Disable FDI_RX_ENABLE, not FDI_RX_PLL_ENABLE When we fail the training. 9 - Change Haswell FDI link training error messages We shouldn't call DRM_ERROR when still looping through voltage levels since this is expected and not really a failure. So in this commit we adjust the error path to only DRM_ERROR when we really fail after trying everything. While at it, replace DRM_DEBUG_DRIVER with DRM_DEBUG_KMS since it's what we use everywhere. 10 - Try each voltage twice at hsw_fdi_link_train Now with Daniel Vetter's suggestion to use "/2" instead of ">>1". Signed-off-by: Paulo Zanoni [danvet: Applied tiny bikesheds: - mention in comment that we test each voltage/emphasis level twice - realing arguments of the only untouched reg write, it spilled over the 80 char limit ...] Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_reg.h | 17 +++-- drivers/gpu/drm/i915/intel_ddi.c | 119 ++++++++++++++++++++--------------- drivers/gpu/drm/i915/intel_display.c | 11 +--- 3 files changed, 82 insertions(+), 65 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 3674891..5e820fa 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -3936,16 +3936,21 @@ #define FDI_PORT_WIDTH_2X_LPT (1<<19) #define FDI_PORT_WIDTH_1X_LPT (0<<19) -#define _FDI_RXA_MISC 0xf0010 -#define _FDI_RXB_MISC 0xf1010 +#define _FDI_RXA_MISC 0xf0010 +#define _FDI_RXB_MISC 0xf1010 +#define FDI_RX_PWRDN_LANE1_MASK (3<<26) +#define FDI_RX_PWRDN_LANE1_VAL(x) ((x)<<26) +#define FDI_RX_PWRDN_LANE0_MASK (3<<24) +#define FDI_RX_PWRDN_LANE0_VAL(x) ((x)<<24) +#define FDI_RX_TP1_TO_TP2_48 (2<<20) +#define FDI_RX_TP1_TO_TP2_64 (3<<20) +#define FDI_RX_FDI_DELAY_90 (0x90<<0) +#define FDI_RX_MISC(pipe) _PIPE(pipe, _FDI_RXA_MISC, _FDI_RXB_MISC) + #define _FDI_RXA_TUSIZE1 0xf0030 #define _FDI_RXA_TUSIZE2 0xf0038 #define _FDI_RXB_TUSIZE1 0xf1030 #define _FDI_RXB_TUSIZE2 0xf1038 -#define FDI_RX_TP1_TO_TP2_48 (2<<20) -#define FDI_RX_TP1_TO_TP2_64 (3<<20) -#define FDI_RX_FDI_DELAY_90 (0x90<<0) -#define FDI_RX_MISC(pipe) _PIPE(pipe, _FDI_RXA_MISC, _FDI_RXB_MISC) #define FDI_RX_TUSIZE1(pipe) _PIPE(pipe, _FDI_RXA_TUSIZE1, _FDI_RXB_TUSIZE1) #define FDI_RX_TUSIZE2(pipe) _PIPE(pipe, _FDI_RXA_TUSIZE2, _FDI_RXB_TUSIZE2) diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c index a7a555f..0095839 100644 --- a/drivers/gpu/drm/i915/intel_ddi.c +++ b/drivers/gpu/drm/i915/intel_ddi.c @@ -153,11 +153,34 @@ void hsw_fdi_link_train(struct drm_crtc *crtc) struct drm_device *dev = crtc->dev; struct drm_i915_private *dev_priv = dev->dev_private; struct intel_crtc *intel_crtc = to_intel_crtc(crtc); - int pipe = intel_crtc->pipe; - u32 reg, temp, i; + u32 temp, i, rx_ctl_val; - /* Start the training iterating through available voltages and emphasis */ - for (i=0; i < ARRAY_SIZE(hsw_ddi_buf_ctl_values); i++) { + /* Set the FDI_RX_MISC pwrdn lanes and the 2 workarounds listed at the + * mode set "sequence for CRT port" document: + * - TP1 to TP2 time with the default value + * - FDI delay to 90h + */ + I915_WRITE(_FDI_RXA_MISC, FDI_RX_PWRDN_LANE1_VAL(2) | + FDI_RX_PWRDN_LANE0_VAL(2) | + FDI_RX_TP1_TO_TP2_48 | FDI_RX_FDI_DELAY_90); + + /* Enable the PCH Receiver FDI PLL */ + rx_ctl_val = FDI_RX_PLL_ENABLE | FDI_RX_ENHANCE_FRAME_ENABLE | + ((intel_crtc->fdi_lanes - 1) << 19); + I915_WRITE(_FDI_RXA_CTL, rx_ctl_val); + POSTING_READ(_FDI_RXA_CTL); + udelay(220); + + /* Switch from Rawclk to PCDclk */ + rx_ctl_val |= FDI_PCDCLK; + I915_WRITE(_FDI_RXA_CTL, rx_ctl_val); + + /* Configure Port Clock Select */ + I915_WRITE(PORT_CLK_SEL(PORT_E), intel_crtc->ddi_pll_sel); + + /* Start the training iterating through available voltages and emphasis, + * testing each value twice. */ + for (i = 0; i < ARRAY_SIZE(hsw_ddi_buf_ctl_values) * 2; i++) { /* Configure DP_TP_CTL with auto-training */ I915_WRITE(DP_TP_CTL(PORT_E), DP_TP_CTL_FDI_AUTOTRAIN | @@ -166,65 +189,63 @@ void hsw_fdi_link_train(struct drm_crtc *crtc) DP_TP_CTL_ENABLE); /* Configure and enable DDI_BUF_CTL for DDI E with next voltage */ - temp = I915_READ(DDI_BUF_CTL(PORT_E)); - temp = (temp & ~DDI_BUF_EMP_MASK); I915_WRITE(DDI_BUF_CTL(PORT_E), - temp | - DDI_BUF_CTL_ENABLE | - ((intel_crtc->fdi_lanes - 1) << 1) | - hsw_ddi_buf_ctl_values[i]); + DDI_BUF_CTL_ENABLE | + ((intel_crtc->fdi_lanes - 1) << 1) | + hsw_ddi_buf_ctl_values[i / 2]); + POSTING_READ(DDI_BUF_CTL(PORT_E)); udelay(600); - /* We need to program FDI_RX_MISC with the default TP1 to TP2 - * values before enabling the receiver, and configure the delay - * for the FDI timing generator to 90h. Luckily, all the other - * bits are supposed to be zeroed, so we can write those values - * directly. - */ - I915_WRITE(FDI_RX_MISC(pipe), FDI_RX_TP1_TO_TP2_48 | - FDI_RX_FDI_DELAY_90); - - /* Enable CPU FDI Receiver with auto-training */ - reg = FDI_RX_CTL(pipe); - I915_WRITE(reg, - I915_READ(reg) | - FDI_LINK_TRAIN_AUTO | - FDI_RX_ENABLE | - FDI_LINK_TRAIN_PATTERN_1_CPT | - FDI_RX_ENHANCE_FRAME_ENABLE | - ((intel_crtc->fdi_lanes - 1) << 19) | - FDI_RX_PLL_ENABLE); - POSTING_READ(reg); - udelay(100); + /* Program PCH FDI Receiver TU */ + I915_WRITE(_FDI_RXA_TUSIZE1, TU_SIZE(64)); + + /* Enable PCH FDI Receiver with auto-training */ + rx_ctl_val |= FDI_RX_ENABLE | FDI_LINK_TRAIN_AUTO; + I915_WRITE(_FDI_RXA_CTL, rx_ctl_val); + POSTING_READ(_FDI_RXA_CTL); + + /* Wait for FDI receiver lane calibration */ + udelay(30); + + /* Unset FDI_RX_MISC pwrdn lanes */ + temp = I915_READ(_FDI_RXA_MISC); + temp &= ~(FDI_RX_PWRDN_LANE1_MASK | FDI_RX_PWRDN_LANE0_MASK); + I915_WRITE(_FDI_RXA_MISC, temp); + POSTING_READ(_FDI_RXA_MISC); + + /* Wait for FDI auto training time */ + udelay(5); temp = I915_READ(DP_TP_STATUS(PORT_E)); if (temp & DP_TP_STATUS_AUTOTRAIN_DONE) { - DRM_DEBUG_DRIVER("BUF_CTL training done on %d step\n", i); + DRM_DEBUG_KMS("FDI link training done on step %d\n", i); /* Enable normal pixel sending for FDI */ I915_WRITE(DP_TP_CTL(PORT_E), - DP_TP_CTL_FDI_AUTOTRAIN | - DP_TP_CTL_LINK_TRAIN_NORMAL | - DP_TP_CTL_ENHANCED_FRAME_ENABLE | - DP_TP_CTL_ENABLE); + DP_TP_CTL_FDI_AUTOTRAIN | + DP_TP_CTL_LINK_TRAIN_NORMAL | + DP_TP_CTL_ENHANCED_FRAME_ENABLE | + DP_TP_CTL_ENABLE); - break; - } else { - DRM_ERROR("Error training BUF_CTL %d\n", i); - - /* Disable DP_TP_CTL and FDI_RX_CTL) and retry */ - I915_WRITE(DP_TP_CTL(PORT_E), - I915_READ(DP_TP_CTL(PORT_E)) & - ~DP_TP_CTL_ENABLE); - I915_WRITE(FDI_RX_CTL(pipe), - I915_READ(FDI_RX_CTL(pipe)) & - ~FDI_RX_PLL_ENABLE); - continue; + return; } + + /* Disable DP_TP_CTL and FDI_RX_CTL and retry */ + I915_WRITE(DP_TP_CTL(PORT_E), + I915_READ(DP_TP_CTL(PORT_E)) & ~DP_TP_CTL_ENABLE); + + rx_ctl_val &= ~FDI_RX_ENABLE; + I915_WRITE(_FDI_RXA_CTL, rx_ctl_val); + + /* Reset FDI_RX_MISC pwrdn lanes */ + temp = I915_READ(_FDI_RXA_MISC); + temp &= ~(FDI_RX_PWRDN_LANE1_MASK | FDI_RX_PWRDN_LANE0_MASK); + temp |= FDI_RX_PWRDN_LANE1_VAL(2) | FDI_RX_PWRDN_LANE0_VAL(2); + I915_WRITE(_FDI_RXA_MISC, temp); } - DRM_DEBUG_KMS("FDI train done.\n"); + DRM_ERROR("FDI link training failed!\n"); } /* WRPLL clock dividers */ diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 50215e4..417fb4a 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -3224,19 +3224,10 @@ static void lpt_pch_enable(struct drm_crtc *crtc) struct drm_device *dev = crtc->dev; struct drm_i915_private *dev_priv = dev->dev_private; struct intel_crtc *intel_crtc = to_intel_crtc(crtc); - int pipe = intel_crtc->pipe; enum transcoder cpu_transcoder = intel_crtc->cpu_transcoder; assert_transcoder_disabled(dev_priv, TRANSCODER_A); - /* Write the TU size bits before fdi link training, so that error - * detection works. */ - I915_WRITE(FDI_RX_TUSIZE1(pipe), - I915_READ(PIPE_DATA_M1(pipe)) & TU_SIZE_MASK); - - /* For PCH output, training FDI link */ - dev_priv->display.fdi_link_train(crtc); - lpt_program_iclkip(crtc); /* Set transcoder timing. */ @@ -3463,7 +3454,7 @@ static void haswell_crtc_enable(struct drm_crtc *crtc) is_pch_port = haswell_crtc_driving_pch(crtc); if (is_pch_port) - ironlake_fdi_pll_enable(intel_crtc); + dev_priv->display.fdi_link_train(crtc); for_each_encoder_on_crtc(dev, crtc, encoder) if (encoder->pre_enable) -- 2.7.4