diff options
| author | Ingo Molnar <mingo@kernel.org> | 2015-03-27 09:46:03 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-03-27 09:46:03 +0100 |
| commit | 072e5a1cfabca7276744d24726e094d85721df5c (patch) | |
| tree | c7237fa143f72273aa8a8179f741c24b9072001c /drivers/gpu/drm/radeon/atombios_dp.c | |
| parent | 294fe0f52a44c6f207211de0686c369a961b5533 (diff) | |
| parent | d525211f9d1be8b523ec7633f080f2116f5ea536 (diff) | |
| download | talos-obmc-linux-072e5a1cfabca7276744d24726e094d85721df5c.tar.gz talos-obmc-linux-072e5a1cfabca7276744d24726e094d85721df5c.zip | |
Merge branch 'perf/urgent' into perf/core, to pick up fixes and to refresh the tree
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/gpu/drm/radeon/atombios_dp.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/atombios_dp.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c index 5bf825dfaa09..8d74de82456e 100644 --- a/drivers/gpu/drm/radeon/atombios_dp.c +++ b/drivers/gpu/drm/radeon/atombios_dp.c @@ -178,6 +178,13 @@ radeon_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) switch (msg->request & ~DP_AUX_I2C_MOT) { case DP_AUX_NATIVE_WRITE: case DP_AUX_I2C_WRITE: + /* The atom implementation only supports writes with a max payload of + * 12 bytes since it uses 4 bits for the total count (header + payload) + * in the parameter space. The atom interface supports 16 byte + * payloads for reads. The hw itself supports up to 16 bytes of payload. + */ + if (WARN_ON_ONCE(msg->size > 12)) + return -E2BIG; /* tx_size needs to be 4 even for bare address packets since the atom * table needs the info in tx_buf[3]. */ |
