lkml.org 
[lkml]   [2011]   [Jul]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    SubjectRe: [PATCH] drm/radeon: Fix Asus M2A-VM HDMI EDID error flooding problem
    From
    On Wed, Jul 6, 2011 at 11:39 AM, Alex Deucher <alexdeucher@gmail.com> wrote:
    > On Wed, Jul 6, 2011 at 6:09 AM,  <reimth@googlemail.com> wrote:
    >> From: Thomas Reim <rdratlos@yahoo.co.uk>
    >>
    >>    Some integrated ATI Radeon chipset implementations
    >>    with add-on HDMI card (e. g. Asus M2A-VM HDMI) indicate the availability
    >>    of a DDC even when the add-on card is not plugged in or HDMI is disabled
    >>    in BIOS setup. In this case, drm_get_edid() and drm_edid_block_valid()
    >>    periodically dump data and kernel errors into system log files and onto
    >>    terminals. For these chipsets DDC probing is extended by a check for a
    >>    correct EDID header. Only in case a valid EDID header is also found, the
    >>    (HDMI) connector will be used by the Radeon driver. This prevents the
    >>    kernel driver from useless flooding of logs and terminal sessions with
    >>    EDID dumps and error messages.
    >>    This patch adds a flag 'requires_extended_probe' to the radeon_connector
    >>    structure. In function radeon_connector_needs_extended_probe() this flag
    >>    can be set on a chipset family/vendor/connector type specific basis.
    >>    In addition, function drm_edid_header_is_valid() has been added for EDID
    >>    header check and function radeon_ddc_probe() has been adapted to perform
    >>    extended DDC probing if required by the connector's flag.
    >>
    >>    Tested for kernel 2.35, 2.38 and 3.0 on Asus M2A-VM HDMI board
    >>
    >
    > Once it's ready, just add:
    > Cc: stable@kernel.org
    > to the commit message and it will go into the stable kernels as well.
    > Might want to mention the bug report in your commit message as well.
    > Just a couple comments below.  With those fixed:
    >
    > Reviewed-by: Alex Deucher <alexdeucher@gmail.com>

    We also may want to revert 4a9a8b71e12d41abb71c4e741bff524f016cfef4
    once this patch goes in, otherwise we may remove the ddc bus
    unnecessarily on some systems.

    Alex
    --
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2011-07-06 17:45    [W:0.022 / U:92.804 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site