[PATCH] drm/amd/display: introduce quirks for i2c adaptor

[Shirish S]

The dp aux channel cannot read messages of size greater
than 16 bytes, this patch adds quirks feild accordingly
at the initialization of the adaptor.

Signed-off-by: Shirish S <shirish.s at amd.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index 782491e..f7d6d9a 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -464,10 +464,15 @@ static const struct drm_dp_mst_topology_cbs dm_mst_cbs = {
 	.register_connector = dm_dp_mst_register_connector
 };
 
+/* I2C adapter quirks, max read len is 16 bytes. */
+static const struct i2c_adapter_quirks dm_dp_aux_quirks = {
+	.max_read_len = 128,
+};
 void amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm,
 				       struct amdgpu_dm_connector *aconnector)
 {
 	aconnector->dm_dp_aux.aux.name = "dmdc";
+	aconnector->dm_dp_aux.aux.ddc.quirks = &dm_dp_aux_quirks;
 	aconnector->dm_dp_aux.aux.dev = dm->adev->dev;
 	aconnector->dm_dp_aux.aux.transfer = dm_dp_aux_transfer;
 	aconnector->dm_dp_aux.ddc_service = aconnector->dc_link->ddc;
-- 
2.7.4