linux/drivers/gpu/drm
Daniel Vetter 82a28bcf56 drm/i915: implement ibx_hpd_irq_setup
This fixes a regression introduced in

commit e5868a318d
Author: Egbert Eich <eich@suse.de>
Date:   Thu Feb 28 04:17:12 2013 -0500

    DRM/i915: Convert HPD interrupts to make use of HPD pin assignment in encode

Due to the irq setup rework in 3.9, see

commit 20afbda209
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Tue Dec 11 14:05:07 2012 +0100

    drm/i915: Fixup hpd irq register setup ordering

Egbert Eich's hpd rework blows up on pch-split platforms - it walks
the encoder list before that has been set up completely. The new init
sequence is:

1. irq enabling
2. modeset init
3. hpd setup

We need to move around the ibx setup a bit to fix this.

Ville Syrjälä pointed out in his review that we can't touch SDEIER
after the interrupt handler is set up, since that'll race with Paulo
Zanoni's PCH interrupt race fix:

commit 44498aea29
Author: Paulo Zanoni <paulo.r.zanoni@intel.com>
Date:   Fri Feb 22 17:05:28 2013 -0300

    drm/i915: also disable south interrupts when handling them

We fix that by unconditionally enabling all interrupts in SDEIER, but
masking them as-needed in SDEIMR. Since only the single-threaded
setup/teardown (or suspend/resume) code touches that, no further
locking is required.

While at it also simplify the mask handling - we start out with all
interrupts cleared in the postinstall hook, and never enable a hpd
interrupt before hpd_irq_setup is called.

And finally, for consistency rename the ibx hpd setup function to
ibx_hpd_irq_setup.

v2: Fix race around SDEIER writes (Ville).

v3: Remove the superflous posting read for SDEIER, spotted by Ville.

Ville also wondered whether we shouldn't clear SDEIIR, since now
SDE interrupts are enabled before we have an irq handler installed.
But the master interrupt control bit in DEIER is still cleared, so we
should be fine.

Cc: Egbert Eich <eich@suse.de>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=62798
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2013-03-27 17:10:44 +01:00
..
ast Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2013-02-25 16:46:44 -08:00
cirrus Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2013-02-25 16:46:44 -08:00
exynos drm/exynos: convert to idr_alloc() 2013-02-27 19:10:15 -08:00
gma500 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-02-26 20:16:07 -08:00
i2c drm/i2c: nxp-tda998x (v3) 2013-02-19 17:57:44 -05:00
i810
i915 drm/i915: implement ibx_hpd_irq_setup 2013-03-27 17:10:44 +01:00
mga
mgag200 drm/mgag200: Bug fix: Renesas board now selects native resolution. 2013-03-08 08:31:49 +10:00
nouveau drm/nv50: use correct tiling methods for m2mf buffer moves 2013-03-11 08:43:09 +10:00
omapdrm Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-02-26 20:16:07 -08:00
r128
radeon drm/radeon: don't check mipmap alignment if MIP_ADDRESS is FMASK 2013-03-07 12:58:59 -05:00
savage
shmobile
sis drm/sis: convert to idr_alloc() 2013-02-27 19:10:16 -08:00
tdfx
tegra drm/tegra: drop "select DRM_HDMI" 2013-03-08 08:36:01 +10:00
tilcdc drm/tilcdc: only build on arm 2013-02-26 09:54:48 +10:00
ttm Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-02-26 20:16:07 -08:00
udl Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-02-26 20:16:07 -08:00
via drm/via: convert to idr_alloc() 2013-02-27 19:10:16 -08:00
vmwgfx drm/vmwgfx: convert to idr_alloc() 2013-02-27 19:10:16 -08:00
ati_pcigart.c
drm_agpsupport.c
drm_auth.c
drm_buffer.c
drm_bufs.c
drm_cache.c drm: handle compact dma scatter lists in drm_clflush_sg() 2013-03-19 09:50:22 +01:00
drm_context.c drm: convert to idr_alloc() 2013-02-27 19:10:15 -08:00
drm_crtc_helper.c
drm_crtc.c drm: convert to idr_alloc() 2013-02-27 19:10:15 -08:00
drm_debugfs.c
drm_dma.c
drm_dp_helper.c
drm_drv.c drm: don't use idr_remove_all() 2013-02-27 19:10:13 -08:00
drm_edid_load.c
drm_edid.c drm: Add HDMI infoframe helpers 2013-02-22 08:20:10 +01:00
drm_encoder_slave.c drm: i2c encoder helper wrappers 2013-02-17 17:55:42 -05:00
drm_fb_cma_helper.c Merge branch 'tilcdc-next' of git://people.freedesktop.org/~robclark/linux into drm-next 2013-02-21 09:31:47 +10:00
drm_fb_helper.c drm: add initial_config function to fb helper 2013-03-26 21:32:53 +01:00
drm_fops.c
drm_gem_cma_helper.c drm/cma: add debugfs helpers 2013-02-17 17:55:42 -05:00
drm_gem.c drm: convert to idr_alloc() 2013-02-27 19:10:15 -08:00
drm_global.c
drm_hashtab.c hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
drm_info.c
drm_ioc32.c
drm_ioctl.c
drm_irq.c drm: small fix in drm_send_vblank_event() 2013-02-17 17:55:42 -05:00
drm_lock.c
drm_memory.c
drm_mm.c
drm_modes.c
drm_pci.c drm/pci: define drm_pcie_get_speed_cap_mask() only when CONFIG_PCI=y 2013-02-15 10:15:19 +10:00
drm_platform.c
drm_prime.c drm: modify pages_to_sg prime helper to create optimized SG table 2013-03-23 12:17:57 +01:00
drm_proc.c
drm_scatter.c
drm_stub.c drm: convert to idr_alloc() 2013-02-27 19:10:15 -08:00
drm_sysfs.c
drm_trace_points.c
drm_trace.h
drm_usb.c
drm_vm.c
Kconfig drm: Add HDMI infoframe helpers 2013-02-22 08:20:10 +01:00
Makefile Merge branch 'tilcdc-next' of git://people.freedesktop.org/~robclark/linux into drm-next 2013-02-21 09:31:47 +10:00
README.drm

************************************************************
* For the very latest on DRI development, please see:      *
*     http://dri.freedesktop.org/                          *
************************************************************

The Direct Rendering Manager (drm) is a device-independent kernel-level
device driver that provides support for the XFree86 Direct Rendering
Infrastructure (DRI).

The DRM supports the Direct Rendering Infrastructure (DRI) in four major
ways:

    1. The DRM provides synchronized access to the graphics hardware via
       the use of an optimized two-tiered lock.

    2. The DRM enforces the DRI security policy for access to the graphics
       hardware by only allowing authenticated X11 clients access to
       restricted regions of memory.

    3. The DRM provides a generic DMA engine, complete with multiple
       queues and the ability to detect the need for an OpenGL context
       switch.

    4. The DRM is extensible via the use of small device-specific modules
       that rely extensively on the API exported by the DRM module.


Documentation on the DRI is available from:
    http://dri.freedesktop.org/wiki/Documentation
    http://sourceforge.net/project/showfiles.php?group_id=387
    http://dri.sourceforge.net/doc/

For specific information about kernel-level support, see:

    The Direct Rendering Manager, Kernel Support for the Direct Rendering
    Infrastructure
    http://dri.sourceforge.net/doc/drm_low_level.html

    Hardware Locking for the Direct Rendering Infrastructure
    http://dri.sourceforge.net/doc/hardware_locking_low_level.html

    A Security Analysis of the Direct Rendering Infrastructure
    http://dri.sourceforge.net/doc/security_low_level.html