drm/nouveau/i2c/g94-: return REPLY_M value on reads

This value represents the actual number of bytes recieved on the AUX
channel as the result of a read transaction.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/auxg94.c b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/auxg94.c
index dc96afb..ab8cb19 100644 (file)
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/auxg94.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/auxg94.c
@@ -152,6 +152,7 @@ g94_i2c_aux_xfer(struct nvkm_i2c_aux *obj, bool retry,
                        AUX_TRACE(&aux->base, "rd %08x", xbuf[i / 4]);
                }
                memcpy(data, xbuf, *size);
+               *size = stat & 0x0000001f;
        }
 
 out:

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/auxgm200.c b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/auxgm200.c
index 50e79a9..ee091fa 100644 (file)
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/auxgm200.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/auxgm200.c
@@ -152,6 +152,7 @@ gm200_i2c_aux_xfer(struct nvkm_i2c_aux *obj, bool retry,
                        AUX_TRACE(&aux->base, "rd %08x", xbuf[i / 4]);
                }
                memcpy(data, xbuf, *size);
+               *size = stat & 0x0000001f;
        }
 
 out: