From 6d139a87b747aaebc969ac5f4eb8db766fcd9cbd Mon Sep 17 00:00:00 2001 From: Bryan Freed Date: Thu, 14 Oct 2010 09:14:51 +0100 Subject: [PATCH] drm/i915: Initialize panel timing registers if VBIOS did not The time between start of the pixel clock and backlight enable is a basic panel timing constraint. If the Panel Power On/Off registers are found to be 0, assume we are booting without VBIOS initialization and set these registers to something reasonable. Change-Id: Ibed6cc10d46bf52fd92e0beb25ae3525b5eef99d Signed-off-by: Bryan Freed [ickle: rearranged into a separate function to distinguish its role from simply parsing the VBIOS tables.] Signed-off-by: Chris Wilson --- drivers/gpu/drm/i915/i915_dma.c | 5 ++++- drivers/gpu/drm/i915/intel_bios.c | 21 +++++++++++++++++++-- drivers/gpu/drm/i915/intel_bios.h | 3 ++- 3 files changed, 25 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c index 2caf43de8a6a..35d121c70a1f 100644 --- a/drivers/gpu/drm/i915/i915_dma.c +++ b/drivers/gpu/drm/i915/i915_dma.c @@ -1235,7 +1235,7 @@ static int i915_load_modeset_init(struct drm_device *dev, */ dev_priv->allow_batchbuffer = 1; - ret = intel_init_bios(dev); + ret = intel_parse_bios(dev); if (ret) DRM_INFO("failed to find VBIOS tables\n"); @@ -2001,6 +2001,9 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags) intel_setup_gmbus(dev); intel_opregion_setup(dev); + /* Make sure the bios did its job and set up vital registers */ + intel_setup_bios(dev); + i915_gem_load(dev); /* Init HWS */ diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c index cc15447eff41..b9560f3cbb3d 100644 --- a/drivers/gpu/drm/i915/intel_bios.c +++ b/drivers/gpu/drm/i915/intel_bios.c @@ -577,7 +577,7 @@ init_vbt_defaults(struct drm_i915_private *dev_priv) } /** - * intel_init_bios - initialize VBIOS settings & find VBT + * intel_parse_bios - find VBT and initialize settings from the BIOS * @dev: DRM device * * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers @@ -586,7 +586,7 @@ init_vbt_defaults(struct drm_i915_private *dev_priv) * Returns 0 on success, nonzero on failure. */ bool -intel_init_bios(struct drm_device *dev) +intel_parse_bios(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; struct pci_dev *pdev = dev->pdev; @@ -647,3 +647,20 @@ intel_init_bios(struct drm_device *dev) return 0; } + +/* Ensure that vital registers have been initialised, even if the BIOS + * is absent or just failing to do its job. + */ +void intel_setup_bios(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + + /* Set the Panel Power On/Off timings if uninitialized. */ + if ((I915_READ(PP_ON_DELAYS) == 0) && (I915_READ(PP_OFF_DELAYS) == 0)) { + /* Set T2 to 40ms and T5 to 200ms */ + I915_WRITE(PP_ON_DELAYS, 0x019007d0); + + /* Set T3 to 35ms and Tx to 200ms */ + I915_WRITE(PP_OFF_DELAYS, 0x015e07d0); + } +} diff --git a/drivers/gpu/drm/i915/intel_bios.h b/drivers/gpu/drm/i915/intel_bios.h index e1a598f2a966..5f8e4edcbbb9 100644 --- a/drivers/gpu/drm/i915/intel_bios.h +++ b/drivers/gpu/drm/i915/intel_bios.h @@ -467,7 +467,8 @@ struct bdb_edp { struct edp_link_params link_params[16]; } __attribute__ ((packed)); -bool intel_init_bios(struct drm_device *dev); +void intel_setup_bios(struct drm_device *dev); +bool intel_parse_bios(struct drm_device *dev); /* * Driver<->VBIOS interaction occurs through scratch bits in -- 2.20.1