From 876a8cdf92b23d268275cdce4397df0c37dac3fe Mon Sep 17 00:00:00 2001 From: Damien Lespiau Date: Tue, 11 Dec 2012 18:48:30 +0000 Subject: [PATCH] drm/i915: Preserve the DDI link reversal configuration Similarly to: commit 6a0d1df3d3a0d2370541164eb0595fe35dcd6de3 Author: Damien Lespiau Date: Tue Dec 11 15:18:28 2012 +0000 drm/i915: Preserve the FDI line reversal override bit on CPT DDI port support lane reversal to easy the PCB layouting work. Let's preserve the bit configured by the BIOS (until we find how to correctly retrieve the information from the VBT, but this does sound more fragile then just relying on the BIOS that has, hopefully, been validated already. Signed-off-by: Damien Lespiau Reviewed-by: Paulo Zanoni Cc: stable@vger.kernel.org Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_reg.h | 1 + drivers/gpu/drm/i915/intel_ddi.c | 19 ++++++++++++++++--- drivers/gpu/drm/i915/intel_drv.h | 1 + 3 files changed, 18 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 64919eee248b..2593fefd81f3 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -4510,6 +4510,7 @@ #define DDI_BUF_EMP_800MV_0DB_HSW (7<<24) /* Sel7 */ #define DDI_BUF_EMP_800MV_3_5DB_HSW (8<<24) /* Sel8 */ #define DDI_BUF_EMP_MASK (0xf<<24) +#define DDI_BUF_PORT_REVERSAL (1<<16) #define DDI_BUF_IS_IDLE (1<<7) #define DDI_A_4_LANES (1<<4) #define DDI_PORT_WIDTH_X1 (0<<1) diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c index 89bdb1be61e6..816c45c71b72 100644 --- a/drivers/gpu/drm/i915/intel_ddi.c +++ b/drivers/gpu/drm/i915/intel_ddi.c @@ -203,7 +203,10 @@ void hsw_fdi_link_train(struct drm_crtc *crtc) DP_TP_CTL_LINK_TRAIN_PAT1 | DP_TP_CTL_ENABLE); - /* Configure and enable DDI_BUF_CTL for DDI E with next voltage */ + /* Configure and enable DDI_BUF_CTL for DDI E with next voltage. + * DDI E does not support port reversal, the functionality is + * achieved on the PCH side in FDI_RX_CTL, so no need to set the + * port reversal bit */ I915_WRITE(DDI_BUF_CTL(PORT_E), DDI_BUF_CTL_ENABLE | ((intel_crtc->fdi_lanes - 1) << 1) | @@ -678,8 +681,11 @@ static void intel_ddi_mode_set(struct drm_encoder *encoder, intel_crtc->eld_vld = false; if (type == INTEL_OUTPUT_DISPLAYPORT || type == INTEL_OUTPUT_EDP) { struct intel_dp *intel_dp = enc_to_intel_dp(encoder); + struct intel_digital_port *intel_dig_port = + enc_to_dig_port(encoder); - intel_dp->DP = DDI_BUF_CTL_ENABLE | DDI_BUF_EMP_400MV_0DB_HSW; + intel_dp->DP = intel_dig_port->port_reversal | + DDI_BUF_CTL_ENABLE | DDI_BUF_EMP_400MV_0DB_HSW; switch (intel_dp->lane_count) { case 1: intel_dp->DP |= DDI_PORT_WIDTH_X1; @@ -1302,11 +1308,15 @@ static void intel_enable_ddi(struct intel_encoder *intel_encoder) uint32_t tmp; if (type == INTEL_OUTPUT_HDMI) { + struct intel_digital_port *intel_dig_port = + enc_to_dig_port(encoder); + /* In HDMI/DVI mode, the port width, and swing/emphasis values * are ignored so nothing special needs to be done besides * enabling the port. */ - I915_WRITE(DDI_BUF_CTL(port), DDI_BUF_CTL_ENABLE); + I915_WRITE(DDI_BUF_CTL(port), + intel_dig_port->port_reversal | DDI_BUF_CTL_ENABLE); } else if (type == INTEL_OUTPUT_EDP) { struct intel_dp *intel_dp = enc_to_intel_dp(encoder); @@ -1484,6 +1494,7 @@ static const struct drm_encoder_helper_funcs intel_ddi_helper_funcs = { void intel_ddi_init(struct drm_device *dev, enum port port) { + struct drm_i915_private *dev_priv = dev->dev_private; struct intel_digital_port *intel_dig_port; struct intel_encoder *intel_encoder; struct drm_encoder *encoder; @@ -1524,6 +1535,8 @@ void intel_ddi_init(struct drm_device *dev, enum port port) intel_encoder->get_hw_state = intel_ddi_get_hw_state; intel_dig_port->port = port; + intel_dig_port->port_reversal = I915_READ(DDI_BUF_CTL(port)) & + DDI_BUF_PORT_REVERSAL; if (hdmi_connector) intel_dig_port->hdmi.sdvox_reg = DDI_BUF_CTL(port); else diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index 006b5aa35bb3..005a91f1f8f5 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -393,6 +393,7 @@ struct intel_dp { struct intel_digital_port { struct intel_encoder base; enum port port; + u32 port_reversal; struct intel_dp dp; struct intel_hdmi hdmi; }; -- 2.30.2