2 files changed, 10 insertions, 5 deletions

diff --git a/drivers/gpu/drm/i915/gvt/display.h b/drivers/gpu/drm/i915/gvt/display.h
index b46b86892d58..ea7c1c525b8c 100644
--- a/drivers/gpu/drm/i915/gvt/display.h
+++ b/drivers/gpu/drm/i915/gvt/display.h
@@ -67,7 +67,7 @@
 #define AUX_NATIVE_REPLY_NAK    (0x1 << 4)
 #define AUX_NATIVE_REPLY_DEFER  (0x2 << 4)
 
-#define AUX_BURST_SIZE          16
+#define AUX_BURST_SIZE          20
 
 /* DPCD addresses */
 #define DPCD_REV                        0x000
diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
index 9be639aa3b55..dea751e76196 100644
--- a/drivers/gpu/drm/i915/gvt/handlers.c
+++ b/drivers/gpu/drm/i915/gvt/handlers.c
@@ -898,11 +898,14 @@ static int dp_aux_ch_ctl_mmio_write(struct intel_vgpu *vgpu,
                 }
 
                 /*
-                 * Write request format: (command + address) occupies
-                 * 3 bytes, followed by (len + 1) bytes of data.
+                 * Write request format: Headr (command + address + size) occupies
+                 * 4 bytes, followed by (len + 1) bytes of data. See details at
+                 * intel_dp_aux_transfer().
                  */
-                if (WARN_ON((len + 4) > AUX_BURST_SIZE))
+                if ((len + 1 + 4) > AUX_BURST_SIZE) {
+                        gvt_vgpu_err("dp_aux_header: len %d is too large\n", len);
                         return -EINVAL;
+                }
 
                 /* unpack data from vreg to buf */
                 for (t = 0; t < 4; t++) {
@@ -966,8 +969,10 @@ static int dp_aux_ch_ctl_mmio_write(struct intel_vgpu *vgpu,
                 /*
                  * Read reply format: ACK (1 byte) plus (len + 1) bytes of data.
                  */
-                if (WARN_ON((len + 2) > AUX_BURST_SIZE))
+                if ((len + 2) > AUX_BURST_SIZE) {
+                        gvt_vgpu_err("dp_aux_header: len %d is too large\n", len);
                         return -EINVAL;
+                }
 
                 /* read from virtual DPCD to vreg */
                 /* first 4 bytes: [ACK][addr][addr+1][addr+2] */