diff options
Diffstat (limited to 'kernels/linux-libre-xen/drm-i915-reorder-setup-sequence-to-have-irqs-for-output-setup.patch')
| -rw-r--r-- | kernels/linux-libre-xen/drm-i915-reorder-setup-sequence-to-have-irqs-for-output-setup.patch | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/kernels/linux-libre-xen/drm-i915-reorder-setup-sequence-to-have-irqs-for-output-setup.patch b/kernels/linux-libre-xen/drm-i915-reorder-setup-sequence-to-have-irqs-for-output-setup.patch new file mode 100644 index 000000000..8dc354488 --- /dev/null +++ b/kernels/linux-libre-xen/drm-i915-reorder-setup-sequence-to-have-irqs-for-output-setup.patch @@ -0,0 +1,124 @@ +From 52d7ecedac3f96fb562cb482c139015372728638 Mon Sep 17 00:00:00 2001 +From: Daniel Vetter <daniel.vetter@ffwll.ch> +Date: Sat, 1 Dec 2012 21:03:22 +0100 +Subject: drm/i915: reorder setup sequence to have irqs for output setup + +From: Daniel Vetter <daniel.vetter@ffwll.ch> + +commit 52d7ecedac3f96fb562cb482c139015372728638 upstream. + +Otherwise the new&shiny irq-driven gmbus and dp aux code won't work that +well. Noticed since the dp aux code doesn't have an automatic fallback +with a timeout (since the hw provides for that already). + +v2: Simple move drm_irq_install before intel_modeset_gem_init, as +suggested by Ben Widawsky. + +v3: Now that interrupts are enabled before all connectors are fully +set up, we might fall over serving a HPD interrupt while things are +still being set up. Instead of jumping through massive hoops and +complicating the code with a separate hpd irq enable step, simply +block out the hotplug work item from doing anything until things are +in place. + +v4: Actually, we can enable hotplug processing only after the fbdev is +fully set up, since we call down into the fbdev from the hotplug work +functions. So stick the hpd enabling right next to the poll helper +initialization. + +v5: We need to enable irqs before intel_modeset_init, since that +function sets up the outputs. + +v6: Fixup cleanup sequence, too. + +Reviewed-by: Imre Deak <imre.deak@intel.com> +Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> + +--- + drivers/gpu/drm/i915/i915_dma.c | 23 ++++++++++++++--------- + drivers/gpu/drm/i915/i915_drv.h | 1 + + drivers/gpu/drm/i915/i915_irq.c | 4 ++++ + 3 files changed, 19 insertions(+), 9 deletions(-) + +--- a/drivers/gpu/drm/i915/i915_dma.c ++++ b/drivers/gpu/drm/i915/i915_dma.c +@@ -1297,19 +1297,21 @@ static int i915_load_modeset_init(struct + if (ret) + goto cleanup_vga_switcheroo; + ++ ret = drm_irq_install(dev); ++ if (ret) ++ goto cleanup_gem_stolen; ++ ++ /* Important: The output setup functions called by modeset_init need ++ * working irqs for e.g. gmbus and dp aux transfers. */ + intel_modeset_init(dev); + + ret = i915_gem_init(dev); + if (ret) +- goto cleanup_gem_stolen; +- +- intel_modeset_gem_init(dev); ++ goto cleanup_irq; + + INIT_WORK(&dev_priv->console_resume_work, intel_console_resume); + +- ret = drm_irq_install(dev); +- if (ret) +- goto cleanup_gem; ++ intel_modeset_gem_init(dev); + + /* Always safe in the mode setting case. */ + /* FIXME: do pre/post-mode set stuff in core KMS code */ +@@ -1317,7 +1319,10 @@ static int i915_load_modeset_init(struct + + ret = intel_fbdev_init(dev); + if (ret) +- goto cleanup_irq; ++ goto cleanup_gem; ++ ++ /* Only enable hotplug handling once the fbdev is fully set up. */ ++ dev_priv->enable_hotplug_processing = true; + + drm_kms_helper_poll_init(dev); + +@@ -1326,13 +1331,13 @@ static int i915_load_modeset_init(struct + + return 0; + +-cleanup_irq: +- drm_irq_uninstall(dev); + cleanup_gem: + mutex_lock(&dev->struct_mutex); + i915_gem_cleanup_ringbuffer(dev); + mutex_unlock(&dev->struct_mutex); + i915_gem_cleanup_aliasing_ppgtt(dev); ++cleanup_irq: ++ drm_irq_uninstall(dev); + cleanup_gem_stolen: + i915_gem_cleanup_stolen(dev); + cleanup_vga_switcheroo: +--- a/drivers/gpu/drm/i915/i915_drv.h ++++ b/drivers/gpu/drm/i915/i915_drv.h +@@ -672,6 +672,7 @@ typedef struct drm_i915_private { + + u32 hotplug_supported_mask; + struct work_struct hotplug_work; ++ bool enable_hotplug_processing; + + int num_pipe; + int num_pch_pll; +--- a/drivers/gpu/drm/i915/i915_irq.c ++++ b/drivers/gpu/drm/i915/i915_irq.c +@@ -287,6 +287,10 @@ static void i915_hotplug_work_func(struc + struct drm_mode_config *mode_config = &dev->mode_config; + struct intel_encoder *encoder; + ++ /* HPD irq before everything is fully set up. */ ++ if (!dev_priv->enable_hotplug_processing) ++ return; ++ + mutex_lock(&mode_config->mutex); + DRM_DEBUG_KMS("running encoder hotplug functions\n"); + |