[RFC v4 02/20] drm/nouveau/kms/nv50-: Remove open-coded drm_dp_read_desc()

Lyude Paul
2020-08-25T19:51:05Z

Noticed this while going through our DP code - we use an open-coded
version of drm_dp_read_desc() instead of just using the helper, so
change that. This will also let us use quirks in the future if we end up
needing them.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Ben Skeggs <bskeggs@redhat.com>
---
drivers/gpu/drm/nouveau/nouveau_connector.c | 3 ++-
drivers/gpu/drm/nouveau/nouveau_dp.c | 30 +++++++--------------
drivers/gpu/drm/nouveau/nouveau_encoder.h | 4 ++-
3 files changed, 14 insertions(+), 23 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index 7674025a4bfe8..e12957e6faa7c 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -435,7 +435,8 @@ nouveau_connector_ddc_detect(struct drm_connector *connector)

switch (nv_encoder->dcb->type) {
case DCB_OUTPUT_DP:
- ret = nouveau_dp_detect(nv_encoder);
+ ret = nouveau_dp_detect(nouveau_connector(connector),
+ nv_encoder);
if (ret == NOUVEAU_DP_MST)
return NULL;
else if (ret == NOUVEAU_DP_SST)
diff --git a/drivers/gpu/drm/nouveau/nouveau_dp.c b/drivers/gpu/drm/nouveau/nouveau_dp.c
index ee778ddc95fae..c4e9c21d4dd2b 100644
--- a/drivers/gpu/drm/nouveau/nouveau_dp.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dp.c
@@ -36,27 +36,9 @@ MODULE_PARM_DESC(mst, "Enable DisplayPort multi-stream (default: enabled)");
static int nouveau_mst = 1;
module_param_named(mst, nouveau_mst, int, 0400);

-static void
-nouveau_dp_probe_oui(struct drm_device *dev, struct nvkm_i2c_aux *aux, u8 *dpcd)
-{
- struct nouveau_drm *drm = nouveau_drm(dev);
- u8 buf[3];
-
- if (!(dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT))
- return;
-
- if (!nvkm_rdaux(aux, DP_SINK_OUI, buf, 3))
- NV_DEBUG(drm, "Sink OUI: %02hx%02hx%02hx\n",
- buf[0], buf[1], buf[2]);
-
- if (!nvkm_rdaux(aux, DP_BRANCH_OUI, buf, 3))
- NV_DEBUG(drm, "Branch OUI: %02hx%02hx%02hx\n",
- buf[0], buf[1], buf[2]);
-
-}
-
int
-nouveau_dp_detect(struct nouveau_encoder *nv_encoder)
+nouveau_dp_detect(struct nouveau_connector *nv_connector,
+ struct nouveau_encoder *nv_encoder)
{
struct drm_device *dev = nv_encoder->base.base.dev;
struct nouveau_drm *drm = nouveau_drm(dev);
@@ -89,7 +71,13 @@ nouveau_dp_detect(struct nouveau_encoder *nv_encoder)
NV_DEBUG(drm, "maximum: %dx%d\n",
nv_encoder->dp.link_nr, nv_encoder->dp.link_bw);

- nouveau_dp_probe_oui(dev, aux, dpcd);
+ ret = drm_dp_read_desc(&nv_connector->aux, &nv_encoder->dp.desc,
+ drm_dp_is_branch(dpcd));
+ if (ret) {
+ NV_ERROR(drm, "Failed to read DP descriptor on %s: %d\n",
+ nv_connector->base.name, ret);
+ return ret;
+ }

ret = nv50_mstm_detect(nv_encoder->dp.mstm, dpcd, nouveau_mst);
if (ret == 1)
diff --git a/drivers/gpu/drm/nouveau/nouveau_encoder.h b/drivers/gpu/drm/nouveau/nouveau_encoder.h
index a72c412ac8b14..6424cdcb4913f 100644
--- a/drivers/gpu/drm/nouveau/nouveau_encoder.h
+++ b/drivers/gpu/drm/nouveau/nouveau_encoder.h
@@ -33,6 +33,7 @@
#include <drm/drm_dp_mst_helper.h>
#include "dispnv04/disp.h"
struct nv50_head_atom;
+struct nouveau_connector;

#define NV_DPMS_CLEARED 0x80

@@ -64,6 +65,7 @@ struct nouveau_encoder {
struct nv50_mstm *mstm;
int link_nr;
int link_bw;
+ struct drm_dp_desc desc;
} dp;
};

@@ -104,7 +106,7 @@ enum nouveau_dp_status {
NOUVEAU_DP_MST,
};

-int nouveau_dp_detect(struct nouveau_encoder *);
+int nouveau_dp_detect(struct nouveau_connector *, struct nouveau_encoder *);
enum drm_mode_status nv50_dp_mode_valid(struct drm_connector *,
struct nouveau_encoder *,
const struct drm_display_mode *,
--
2.26.2