linux_dsm_epyc7002/drivers/gpu/drm
Paulo Zanoni adf00b26d1 drm/i915: make sure we write all the DIP data bytes
... even if the actual infoframe is smaller than the maximum possible
size.

If we don't write all the 32 DIP data bytes the InfoFrame ECC may not
be correctly calculated in some cases (e.g., when changing the port),
and this will lead to black screens on HDMI monitors. The ECC value is
generated by the hardware.

I don't see how this should break anything since we're writing 0 and
that should be the correct value, so this patch should be safe.

Notice that on IVB and older we actually have 64 bytes available for
VIDEO_DIP_DATA, but only bytes 0-31 actually store infoframe data: the
others are either read-only ECC values or marked as "reserved". On HSW
we only have 32 bytes, and the ECC value is stored on its own separate
read-only register. See BSpec.

This patch fixes bug #46761, which is marked as a regression
introduced by commit 4e89ee174b:
    drm/i915: set the DIP port on ibx_write_infoframe

Before commit 4e89 we were just failing to send AVI infoframes when we
needed to change the port, which can lead to black screens in some
cases. After commit 4e89 we started sending infoframes, but with a
possibly wrong ECC value. After this patch I hope we start sending
correct infoframes.

Version 2:
  - Improve commit message
  - Try to make the code more clear

Cc: stable@vger.kernel.org
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=46761
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2012-09-26 09:24:09 +02:00
..
ast Linux 3.6-rc7 2012-09-24 18:17:12 +02:00
cirrus Linux 3.6-rc7 2012-09-24 18:17:12 +02:00
exynos Linux 3.6-rc7 2012-09-24 18:17:12 +02:00
gma500 Linux 3.6-rc7 2012-09-24 18:17:12 +02:00
i2c drm/i2c/ch7006: Convert to dev_pm_ops 2012-08-24 09:56:08 +10:00
i810 drm: use drm_compat_ioctl for 32-bit apps 2012-09-06 06:55:02 +10:00
i915 drm/i915: make sure we write all the DIP data bytes 2012-09-26 09:24:09 +02:00
mga drm: kill reclaim_buffers callback 2012-07-19 22:50:28 -04:00
mgag200 Linux 3.6-rc7 2012-09-24 18:17:12 +02:00
nouveau Linux 3.6-rc7 2012-09-24 18:17:12 +02:00
r128 drm: kill reclaim_buffers callback 2012-07-19 22:50:28 -04:00
radeon Linux 3.6-rc7 2012-09-24 18:17:12 +02:00
savage drm: use drm_compat_ioctl for 32-bit apps 2012-09-06 06:55:02 +10:00
shmobile drm: Renesas SH Mobile DRM driver 2012-09-18 12:28:22 +02:00
sis drm: use drm_compat_ioctl for 32-bit apps 2012-09-06 06:55:02 +10:00
tdfx drm: use drm_compat_ioctl for 32-bit apps 2012-09-06 06:55:02 +10:00
ttm drm: Handle io prot correctly for MIPS. 2012-08-24 09:41:05 +10:00
udl Linux 3.6-rc7 2012-09-24 18:17:12 +02:00
via drm: use drm_compat_ioctl for 32-bit apps 2012-09-06 06:55:02 +10:00
vmwgfx Linux 3.6-rc7 2012-09-24 18:17:12 +02:00
ati_pcigart.c
drm_agpsupport.c
drm_auth.c
drm_buffer.c
drm_bufs.c drm: kill dma queue support 2012-07-19 22:50:55 -04:00
drm_cache.c drm/i915: Replace the array of pages with a scatterlist 2012-09-20 14:22:57 +02:00
drm_context.c drm: Unify and fix idr error handling 2012-04-24 09:50:20 +01:00
drm_crtc_helper.c drm: Don't initialize local ret variable when not needed 2012-05-22 10:32:58 +01:00
drm_crtc.c Linux 3.6-rc7 2012-09-24 18:17:12 +02:00
drm_debugfs.c drm: kill dma queue support 2012-07-19 22:50:55 -04:00
drm_dma.c drm: kill dma queue support 2012-07-19 22:50:55 -04:00
drm_dp_i2c_helper.c
drm_drv.c drm: make buffer management work without DRM_MASTER 2012-09-13 11:19:44 +10:00
drm_edid_load.c drm/edid: limit printk when facing bad edid 2012-09-17 11:16:40 +10:00
drm_edid_modes.h drm: consistently name interlaced modes 2012-09-13 11:21:03 +10:00
drm_edid.c Linux 3.6-rc7 2012-09-24 18:17:12 +02:00
drm_encoder_slave.c
drm_fb_cma_helper.c DRM: Add DRM KMS/FB CMA helper 2012-09-18 12:28:21 +02:00
drm_fb_helper.c drm/fb helper: don't call drm_helper_connector_dpms directly 2012-09-08 00:51:15 +02:00
drm_fops.c drm: track dev_mapping in more robust and flexible way 2012-07-25 14:09:30 +10:00
drm_gem_cma_helper.c DRM: Add DRM GEM CMA helper 2012-09-18 12:28:21 +02:00
drm_gem.c drm: Add colouring to the range allocator 2012-07-16 05:59:37 +10:00
drm_global.c
drm_hashtab.c
drm_info.c drm: kill dma queue support 2012-07-19 22:50:55 -04:00
drm_ioc32.c
drm_ioctl.c drm/prime: expose capability flags for userspace. 2012-05-18 11:12:16 +01:00
drm_irq.c drm: Add missing static storage class specifier in drm_irq.c file 2012-08-24 10:00:56 +10:00
drm_lock.c drm: ditch strange DRIVER_DMA_QUEUE only error bail-out 2012-07-19 22:50:47 -04:00
drm_memory.c
drm_mm.c drm: Add colouring to the range allocator 2012-07-16 05:59:37 +10:00
drm_modes.c drm: Remove two unused fields from struct drm_display_mode 2012-08-22 09:27:27 +10:00
drm_pci.c drm/pci: add support for getting the supported link bw. 2012-07-19 22:29:25 -04:00
drm_platform.c
drm_prime.c drm/prime: add exported buffers to current fprivs imported buffer list (v2) 2012-05-23 10:46:03 +01:00
drm_proc.c drm: Add missing static storage class specifiers in drm_proc.c file 2012-08-22 09:30:00 +10:00
drm_scatter.c
drm_stub.c drm: Don't initialize local ret variable when not needed 2012-05-22 10:32:58 +01:00
drm_sysfs.c drm: fail gracefully when proc isn't setup. 2012-07-16 05:57:03 +10:00
drm_trace_points.c
drm_trace.h
drm_usb.c drm/usb: fix module license on drm/usb layer. 2012-04-19 09:33:32 +01:00
drm_vm.c drm: Remove unnecessary test for ARM. 2012-09-13 11:28:39 +10:00
Kconfig drm: Renesas SH Mobile DRM driver 2012-09-18 12:28:22 +02:00
Makefile drm: Renesas SH Mobile DRM driver 2012-09-18 12:28:22 +02:00
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