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    Subject[PATCH 3.5 07/62] drm/i915/dp: increase native aux defer retry timeout
    Date
    3.5.7.32 -stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Jani Nikula <jani.nikula@intel.com>

    commit 04eada25d1f72efdecd32d702706594f81de65d5 upstream.

    Give more slack to sink devices before retrying on native aux
    defer. AFAICT the 100 us timeout was not based on the DP spec.

    Signed-off-by: Jani Nikula <jani.nikula@intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
    [ luis: backported to 3.5: adjusted context ]
    Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
    ---
    drivers/gpu/drm/i915/intel_dp.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
    index 0224d43..fa14b42 100644
    --- a/drivers/gpu/drm/i915/intel_dp.c
    +++ b/drivers/gpu/drm/i915/intel_dp.c
    @@ -510,7 +510,7 @@ intel_dp_aux_native_write(struct intel_dp *intel_dp,
    if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_ACK)
    break;
    else if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_DEFER)
    - udelay(100);
    + usleep_range(400, 500);
    else
    return -EIO;
    }
    @@ -559,7 +559,7 @@ intel_dp_aux_native_read(struct intel_dp *intel_dp,
    return ret - 1;
    }
    else if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_DEFER)
    - udelay(100);
    + usleep_range(400, 500);
    else
    return -EIO;
    }
    --
    1.9.0


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