diff options
author | Jani Nikula <jani.nikula@intel.com> | 2014-02-11 11:52:05 +0200 |
---|---|---|
committer | Ben Hutchings <ben@decadent.org.uk> | 2014-04-02 00:58:52 +0100 |
commit | b7b269a7ff58af01cf5c031a31eeb9c4579aabae (patch) | |
tree | acc58f6daec154c43212575013f87518bff250c0 /drivers/gpu | |
parent | 531a799a2088e138937baa9b2e4e3ef883276a47 (diff) | |
download | kernel_samsung_smdk4412-b7b269a7ff58af01cf5c031a31eeb9c4579aabae.zip kernel_samsung_smdk4412-b7b269a7ff58af01cf5c031a31eeb9c4579aabae.tar.gz kernel_samsung_smdk4412-b7b269a7ff58af01cf5c031a31eeb9c4579aabae.tar.bz2 |
drm/i915/dp: add native aux defer retry limit
commit f51a44b9a6c4982cc25bfb3727de9bb893621ebc upstream.
Retrying indefinitely places too much trust on the aux implementation of
the sink devices.
Reported-by: Daniel Martin <consume.noise@gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=71267
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Tested-by: Theodore Ts'o <tytso@mit.edu>
Tested-by: Sree Harsha Totakura <freedesktop@h.totakura.in>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'drivers/gpu')
-rw-r--r-- | drivers/gpu/drm/i915/intel_dp.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 39849a9..ca75076 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -483,6 +483,7 @@ intel_dp_aux_native_write(struct intel_dp *intel_dp, uint8_t msg[20]; int msg_bytes; uint8_t ack; + int retry; intel_dp_check_edp(intel_dp); if (send_bytes > 16) @@ -493,18 +494,20 @@ intel_dp_aux_native_write(struct intel_dp *intel_dp, msg[3] = send_bytes - 1; memcpy(&msg[4], send, send_bytes); msg_bytes = send_bytes + 4; - for (;;) { + for (retry = 0; retry < 7; retry++) { ret = intel_dp_aux_ch(intel_dp, msg, msg_bytes, &ack, 1); if (ret < 0) return ret; if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_ACK) - break; + return send_bytes; else if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_DEFER) usleep_range(400, 500); else return -EIO; } - return send_bytes; + + DRM_ERROR("too many retries, giving up\n"); + return -EIO; } /* Write a single byte to the aux channel in native mode */ @@ -526,6 +529,7 @@ intel_dp_aux_native_read(struct intel_dp *intel_dp, int reply_bytes; uint8_t ack; int ret; + int retry; intel_dp_check_edp(intel_dp); msg[0] = AUX_NATIVE_READ << 4; @@ -536,7 +540,7 @@ intel_dp_aux_native_read(struct intel_dp *intel_dp, msg_bytes = 4; reply_bytes = recv_bytes + 1; - for (;;) { + for (retry = 0; retry < 7; retry++) { ret = intel_dp_aux_ch(intel_dp, msg, msg_bytes, reply, reply_bytes); if (ret == 0) @@ -553,6 +557,9 @@ intel_dp_aux_native_read(struct intel_dp *intel_dp, else return -EIO; } + + DRM_ERROR("too many retries, giving up\n"); + return -EIO; } static int |