[PATCH 4/9] drm/i915: Use EAGAIN instead EBUSY for aux retry.

[Rodrigo Vivi]

Current EBUSY meaning is immediately retry, but this is
about to change. DRM aux transfer is about to change and
make EAGAIN the immediately retry and use EBUSY to wait
a bit for aux channels to recover for any error or wake up.

This has no functional change if the EAGAIN support is in
place already for drm aux transfer.

Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.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 2805f0d..1261d26 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -835,7 +835,7 @@ intel_dp_aux_ch(struct intel_dp *intel_dp,
                        last_status = status;
                }

-               ret = -EBUSY;
+               ret = -EAGAIN;
                goto out;
        }

@@ -890,7 +890,7 @@ intel_dp_aux_ch(struct intel_dp *intel_dp,

        if ((status & DP_AUX_CH_CTL_DONE) == 0) {
                DRM_ERROR("dp_aux_ch not done status 0x%08x\n", status);
-               ret = -EBUSY;
+               ret = -EAGAIN;
                goto out;
        }

-- 
2.4.3