[PATCH 4/5] drm/DP: Export drm_dp_dpcd_access() DP helper function

[Egbert Eich <eich@suse.de>]

It may be required to wrap the generic DP DPCD transfer function to
perfrom certain operations before of after this function is called.

Signed-off-by: Egbert Eich <eich@suse.de>
---
 drivers/gpu/drm/drm_dp_helper.c | 3 ++-
 include/drm/drm_dp_helper.h     | 4 ++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index f17ac01..2a731e6 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -171,7 +171,7 @@ EXPORT_SYMBOL(drm_dp_bw_code_to_link_rate);
  * Both native and I2C-over-AUX transactions are supported.
  */
 
-static int drm_dp_dpcd_access(struct drm_dp_aux *aux, u8 request,
+int drm_dp_dpcd_access(struct drm_dp_aux *aux, u8 request,
 			      unsigned int offset, void *buffer, size_t size)
 {
 	struct drm_dp_aux_msg msg;
@@ -220,6 +220,7 @@ static int drm_dp_dpcd_access(struct drm_dp_aux *aux, u8 request,
 	DRM_DEBUG_KMS("too many retries, giving up\n");
 	return -EIO;
 }
+EXPORT_SYMBOL(drm_dp_dpcd_access);
 
 /**
  * drm_dp_dpcd_read() - read a series of bytes from the DPCD
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 0103b7f..ad04f64 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -405,6 +405,8 @@
 #define MODE_I2C_READ	4
 #define MODE_I2C_STOP	8
 
+struct drm_dp_aux;
+
 #define DP_LINK_STATUS_SIZE	   6
 bool drm_dp_channel_eq_ok(const u8 link_status[DP_LINK_STATUS_SIZE],
 			  int lane_count);
@@ -423,6 +425,8 @@ void drm_dp_link_train_channel_eq_delay(const u8 dpcd[DP_RECEIVER_CAP_SIZE]);
 
 u8 drm_dp_link_rate_to_bw_code(int link_rate);
 int drm_dp_bw_code_to_link_rate(u8 link_bw);
+int drm_dp_dpcd_access(struct drm_dp_aux *aux, u8 request,
+		       unsigned int offset, void *buffer, size_t size);
 int drm_dp_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
 		    int num);
 
-- 
1.8.4.5

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