drm/i915/dp: return number of bytes written for short aux/i2c writes

Allow for a larger receive data size, and check if the receiver returned
the number of bytes written. Without this, we've basically skipped all
the unwritten bytes for short writes.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 5256c06..3967af1 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -951,7 +951,7 @@ intel_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
        case DP_AUX_NATIVE_WRITE:
        case DP_AUX_I2C_WRITE:
                txsize = msg->size ? HEADER_SIZE + msg->size : BARE_ADDRESS_SIZE;
-               rxsize = 1;
+               rxsize = 2; /* 0 or 1 data bytes */
 
                if (WARN_ON(txsize > 20))
                        return -E2BIG;
@@ -962,8 +962,13 @@ intel_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
                if (ret > 0) {
                        msg->reply = rxbuf[0] >> 4;
 
-                       /* Return payload size. */
-                       ret = msg->size;
+                       if (ret > 1) {
+                               /* Number of bytes written in a short write. */
+                               ret = clamp_t(int, rxbuf[1], 0, msg->size);
+                       } else {
+                               /* Return payload size. */
+                               ret = msg->size;
+                       }
                }
                break;