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authorAlex Deucher <alexander.deucher@amd.com>2011-10-03 09:13:46 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2011-10-16 14:14:52 -0700
commitc6e2e6abefaceb135487e805b7af78afdbff563e (patch)
treeb61dcba30a262590e9aa8f740f5265d4c6617ecb
parent290771305e6699f3807950f30562781d9bc593df (diff)
drm/radeon/kms: add retry limits for native DP aux defer
commit 6375bda073724ead7df08746866b724b1799a295 upstream. The previous code could potentially loop forever. Limit the number of DP aux defer retries to 4 for native aux transactions, same as i2c over aux transactions. Noticed by: Brad Campbell <lists2009@fnarfbargle.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Cc: Brad Campbell <lists2009@fnarfbargle.com> Signed-off-by: Dave Airlie <airlied@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/gpu/drm/radeon/atombios_dp.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
index f526fa77e320..4da23889fea6 100644
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -115,6 +115,7 @@ static int radeon_dp_aux_native_write(struct radeon_connector *radeon_connector,
u8 msg[20];
int msg_bytes = send_bytes + 4;
u8 ack;
+ unsigned retry;
if (send_bytes > 16)
return -1;
@@ -125,20 +126,20 @@ static int radeon_dp_aux_native_write(struct radeon_connector *radeon_connector,
msg[3] = (msg_bytes << 4) | (send_bytes - 1);
memcpy(&msg[4], send, send_bytes);
- while (1) {
+ for (retry = 0; retry < 4; retry++) {
ret = radeon_process_aux_ch(dig_connector->dp_i2c_bus,
msg, msg_bytes, NULL, 0, delay, &ack);
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)
udelay(400);
else
return -EIO;
}
- return send_bytes;
+ return -EIO;
}
static int radeon_dp_aux_native_read(struct radeon_connector *radeon_connector,
@@ -149,13 +150,14 @@ static int radeon_dp_aux_native_read(struct radeon_connector *radeon_connector,
int msg_bytes = 4;
u8 ack;
int ret;
+ unsigned retry;
msg[0] = address;
msg[1] = address >> 8;
msg[2] = AUX_NATIVE_READ << 4;
msg[3] = (msg_bytes << 4) | (recv_bytes - 1);
- while (1) {
+ for (retry = 0; retry < 4; retry++) {
ret = radeon_process_aux_ch(dig_connector->dp_i2c_bus,
msg, msg_bytes, recv, recv_bytes, delay, &ack);
if (ret < 0)
@@ -169,6 +171,8 @@ static int radeon_dp_aux_native_read(struct radeon_connector *radeon_connector,
else
return -EIO;
}
+
+ return -EIO;
}
static void radeon_write_dpcd_reg(struct radeon_connector *radeon_connector,