The newer version of DSS (AM625-DSS) has 2 OLDI TXes at its disposal.
These can be configured to support the following modes:
1. OLDI_SINGLE_LINK_SINGLE_MODE
Single Output over OLDI 0.
+------+ +---------+ +-------+
| | | | | |
| CRTC +------->+ ENCODER +----->| PANEL |
| | | | | |
+------+ +---------+ +-------+
2. OLDI_SINGLE_LINK_CLONE_MODE
Duplicate Output over OLDI 0 and 1.
+------+ +---------+ +-------+
| | | | | |
| CRTC +---+--->| ENCODER +----->| PANEL |
| | | | | | |
+------+ | +---------+ +-------+
|
| +---------+ +-------+
| | | | |
+--->| ENCODER +----->| PANEL |
| | | |
+---------+ +-------+
3. OLDI_DUAL_LINK_MODE
Combined Output over OLDI 0 and 1.
+------+ +---------+ +-------+
| | | +----->| |
| CRTC +------->+ ENCODER | | PANEL |
| | | +----->| |
+------+ +---------+ +-------+
Following the above pathways for different modes, 2 encoder/panel-bridge
pipes get created for clone mode, and 1 pipe in cases of single link and
dual link mode.
Add support for confguring the OLDI modes using OF and LVDS DRM helper
functions.
Signed-off-by: Aradhya Bhatia <a-bhatia1@xxxxxx>
---
drivers/gpu/drm/tidss/tidss_dispc.c | 12 ++
drivers/gpu/drm/tidss/tidss_dispc.h | 9 ++
drivers/gpu/drm/tidss/tidss_drv.h | 3 +
drivers/gpu/drm/tidss/tidss_encoder.c | 4 +-
drivers/gpu/drm/tidss/tidss_encoder.h | 3 +-
drivers/gpu/drm/tidss/tidss_kms.c | 188 +++++++++++++++++++++++---
6 files changed, 198 insertions(+), 21 deletions(-)
diff --git a/drivers/gpu/drm/tidss/tidss_dispc.c b/drivers/gpu/drm/tidss/tidss_dispc.c
index dbc6a5b617ca..472226a83251 100644
--- a/drivers/gpu/drm/tidss/tidss_dispc.c
+++ b/drivers/gpu/drm/tidss/tidss_dispc.c
@@ -365,6 +365,8 @@ struct dispc_device {
struct dss_vp_data vp_data[TIDSS_MAX_VPS];
+ enum dispc_oldi_modes oldi_mode;
+
u32 *fourccs;
u32 num_fourccs;
@@ -1967,6 +1969,16 @@ const u32 *dispc_plane_formats(struct dispc_device *dispc, unsigned int *len)
return dispc->fourccs;
}
+int dispc_set_oldi_mode(struct dispc_device *dispc,
+ enum dispc_oldi_modes oldi_mode)
+{
+ WARN_ON(!dispc);
+
+ dispc->oldi_mode = oldi_mode;
+
+ return 0;
+}
+
static s32 pixinc(int pixels, u8 ps)
{
if (pixels == 1)
diff --git a/drivers/gpu/drm/tidss/tidss_dispc.h b/drivers/gpu/drm/tidss/tidss_dispc.h
index 51db500590ee..e76a7599b544 100644
--- a/drivers/gpu/drm/tidss/tidss_dispc.h
+++ b/drivers/gpu/drm/tidss/tidss_dispc.h
@@ -64,6 +64,14 @@ enum dispc_dss_subrevision {
DISPC_AM625,
};
+enum dispc_oldi_modes {
+ OLDI_MODE_OFF, /* OLDI turned off / tied off in IP. */
+ OLDI_SINGLE_LINK_SINGLE_MODE, /* Single Output over OLDI 0. */
+ OLDI_SINGLE_LINK_CLONE_MODE, /* Duplicate Output over OLDI 0 and 1. */
+ OLDI_DUAL_LINK_MODE, /* Combined Output over OLDI 0 and 1. */
+ OLDI_MODE_UNSUPPORTED, /* Unsupported OLDI Mode */
+};
+
struct dispc_features {
int min_pclk_khz;
int max_pclk_khz[DISPC_VP_MAX_BUS_TYPE];
@@ -133,6 +141,7 @@ int dispc_plane_setup(struct dispc_device *dispc, u32 hw_plane,
u32 hw_videoport);
int dispc_plane_enable(struct dispc_device *dispc, u32 hw_plane, bool enable);
const u32 *dispc_plane_formats(struct dispc_device *dispc, unsigned int *len);
+int dispc_set_oldi_mode(struct dispc_device *dispc, enum dispc_oldi_modes oldi_mode);
int dispc_init(struct tidss_device *tidss);
void dispc_remove(struct tidss_device *tidss);
diff --git a/drivers/gpu/drm/tidss/tidss_drv.h b/drivers/gpu/drm/tidss/tidss_drv.h
index 0ce7ee5ccd5b..58892f065c16 100644
--- a/drivers/gpu/drm/tidss/tidss_drv.h
+++ b/drivers/gpu/drm/tidss/tidss_drv.h
@@ -13,6 +13,9 @@
#define TIDSS_MAX_PLANES 4
#define TIDSS_MAX_OUTPUT_PORTS 4
+/* For AM625-DSS with 2 OLDI TXes */
+#define TIDSS_MAX_BRIDGES_PER_PIPE 2
+
typedef u32 dispc_irq_t;
struct tidss_device {
diff --git a/drivers/gpu/drm/tidss/tidss_encoder.c b/drivers/gpu/drm/tidss/tidss_encoder.c
index e278a9c89476..141383ec4045 100644
--- a/drivers/gpu/drm/tidss/tidss_encoder.c
+++ b/drivers/gpu/drm/tidss/tidss_encoder.c
@@ -70,7 +70,8 @@ static const struct drm_encoder_funcs encoder_funcs = {
};
struct drm_encoder *tidss_encoder_create(struct tidss_device *tidss,
- u32 encoder_type, u32 possible_crtcs)
+ u32 encoder_type, u32 possible_crtcs,
+ u32 possible_clones)
{
struct drm_encoder *enc;
int ret;
@@ -80,6 +81,7 @@ struct drm_encoder *tidss_encoder_create(struct tidss_device *tidss,
return ERR_PTR(-ENOMEM);
enc->possible_crtcs = possible_crtcs;
+ enc->possible_clones = possible_clones;
ret = drm_encoder_init(&tidss->ddev, enc, &encoder_funcs,
encoder_type, NULL);
diff --git a/drivers/gpu/drm/tidss/tidss_encoder.h b/drivers/gpu/drm/tidss/tidss_encoder.h
index ace877c0e0fd..01c62ba3ef16 100644
--- a/drivers/gpu/drm/tidss/tidss_encoder.h
+++ b/drivers/gpu/drm/tidss/tidss_encoder.h
@@ -12,6 +12,7 @@
struct tidss_device;
struct drm_encoder *tidss_encoder_create(struct tidss_device *tidss,
- u32 encoder_type, u32 possible_crtcs);
+ u32 encoder_type, u32 possible_crtcs,
+ u32 possible_clones);
#endif
diff --git a/drivers/gpu/drm/tidss/tidss_kms.c b/drivers/gpu/drm/tidss/tidss_kms.c
index fc9c4eefd31d..8ae321f02197 100644
--- a/drivers/gpu/drm/tidss/tidss_kms.c
+++ b/drivers/gpu/drm/tidss/tidss_kms.c
@@ -106,30 +106,115 @@ static const struct drm_mode_config_funcs mode_config_funcs = {
.atomic_commit = drm_atomic_helper_commit,
};
+static enum dispc_oldi_modes tidss_get_oldi_mode(struct device_node *oldi0_port,
+ struct device_node *oldi1_port)
+{
+ int pixel_order;
+
+ if (!(oldi0_port || oldi1_port)) {
+ /* Keep OLDI TXes off if neither OLDI port is present. */
+ return OLDI_MODE_OFF;
+ } else if (oldi0_port && !oldi1_port) {
+ /*
+ * OLDI0 port found, but not OLDI1 port. Setting single
+ * link, single mode output.
+ */
+ return OLDI_SINGLE_LINK_SINGLE_MODE;
+ } else if (!oldi0_port && oldi1_port) {
+ /*
+ * The 2nd OLDI TX cannot be operated alone. This use case is
+ * not supported in the HW. Since the pins for OLDIs 0 and 1 are
+ * separate, one could theoretically set a clone mode over OLDIs
+ * 0 and 1 and just simply not use the OLDI 0. This is a hacky
+ * way to enable only OLDI TX 1 and hence is not officially
+ * supported.
+ */
+ return OLDI_MODE_UNSUPPORTED;
+ }
+
+ /*
+ * OLDI Ports found for both the OLDI TXes. The DSS is to be configured
+ * in either Dual Link or Clone Mode.
+ */
+ pixel_order = drm_of_lvds_get_dual_link_pixel_order(oldi0_port,
+ oldi1_port);
+ switch (pixel_order) {
+ case -EINVAL:
+ /*
+ * The dual link properties were not found in at least one of
+ * the sink nodes. Since 2 OLDI ports are present in the DT, it
+ * can be safely assumed that the required configuration is
+ * Clone Mode.
+ */
+ return OLDI_SINGLE_LINK_CLONE_MODE;
+
+ case DRM_LVDS_DUAL_LINK_EVEN_ODD_PIXELS:
+ /*
+ * Note that the OLDI TX 0 transmits the odd set of pixels while
+ * the OLDI TX 1 transmits the even set. This is a fixed
+ * configuration in the IP and an cannot be change vis SW. These
+ * properties have been used to merely identify if a Dual Link
+ * configuration is required. Swapping this property in the panel
+ * port DT nodes will not make any difference.
+ */
+ pr_warn("EVEN-ODD config for dual-link sinks is not supported in HW. Switching to ODD-EVEN.\n");
+ fallthrough;
+
+ case DRM_LVDS_DUAL_LINK_ODD_EVEN_PIXELS:
+ return OLDI_DUAL_LINK_MODE;
+
+ default:
+ return OLDI_MODE_OFF;
+ }
+}
+
static int tidss_dispc_modeset_init(struct tidss_device *tidss)
{
struct device *dev = tidss->dev;
unsigned int fourccs_len;
const u32 *fourccs = dispc_plane_formats(tidss->dispc, &fourccs_len);
- unsigned int i;
+ unsigned int i, j;
struct pipe {
u32 hw_videoport;
- struct drm_bridge *bridge;
+ struct drm_bridge *bridge[TIDSS_MAX_BRIDGES_PER_PIPE];
u32 enc_type;
+ u32 num_bridges;
};
const struct dispc_features *feat = tidss->feat;
- u32 max_vps = feat->num_vps;
+ u32 output_ports = feat->num_output_ports;
u32 max_planes = feat->num_planes;
- struct pipe pipes[TIDSS_MAX_VPS];
+ struct pipe pipes[TIDSS_MAX_VPS] = {0};
+
u32 num_pipes = 0;
u32 crtc_mask;
+ u32 portnum_oldi0 = 0, portnum_oldi1 = 2;
+ enum dispc_oldi_modes oldi_mode = OLDI_MODE_OFF;
+ u32 num_oldi = 0;
+ u32 oldi_pipe_index = 0;
+ u32 num_encoders = 0;
+
+ if (feat->oldi_supported) {
+ struct device_node *oldi0_port, *oldi1_port;
+
+ oldi0_port = of_graph_get_port_by_id(dev->of_node,
+ portnum_oldi0);
+ oldi1_port = of_graph_get_port_by_id(dev->of_node,
+ portnum_oldi1);
+
+ oldi_mode = tidss_get_oldi_mode(oldi0_port, oldi1_port);
+
+ of_node_put(oldi0_port);
+ of_node_put(oldi1_port);
+
+ dispc_set_oldi_mode(tidss->dispc, oldi_mode);
+ }
/* first find all the connected panels & bridges */
- for (i = 0; i < max_vps; i++) {
+ for (i = 0; i < output_ports; i++) {
struct drm_panel *panel;
struct drm_bridge *bridge;
u32 enc_type = DRM_MODE_ENCODER_NONE;
@@ -145,16 +230,24 @@ static int tidss_dispc_modeset_init(struct tidss_device *tidss)
return ret;
}
+ if (feat->output_port_bus_type[i] == DISPC_VP_OLDI &&
+ oldi_mode == OLDI_MODE_UNSUPPORTED) {
+ dev_err(dev,
+ "Single Mode over OLDI 1 is not supported in HW. Keeping OLDI off.\n");
+ continue;
+ }
+
if (panel) {
u32 conn_type;
dev_dbg(dev, "Setting up panel for port %d\n", i);
- switch (feat->vp_bus_type[i]) {
+ switch (feat->output_port_bus_type[i]) {
case DISPC_VP_OLDI:
enc_type = DRM_MODE_ENCODER_LVDS;
conn_type = DRM_MODE_CONNECTOR_LVDS;
break;
+
case DISPC_VP_DPI:
enc_type = DRM_MODE_ENCODER_DPI;
conn_type = DRM_MODE_CONNECTOR_DPI;
@@ -172,6 +265,17 @@ static int tidss_dispc_modeset_init(struct tidss_device *tidss)
return -EINVAL;
}
+ /*
+ * If the 2nd OLDI port is discovered connected to a panel
+ * which is not to be connected in the Clone Mode then a
+ * bridge is not required because the detected port is the
+ * 2nd port for the previously connected panel.
+ */
+ if (feat->output_port_bus_type[i] == DISPC_VP_OLDI &&
+ oldi_mode != OLDI_SINGLE_LINK_CLONE_MODE &&
+ num_oldi)
+ break;
+
bridge = devm_drm_panel_bridge_add(dev, panel);
if (IS_ERR(bridge)) {
dev_err(dev,
@@ -181,10 +285,47 @@ static int tidss_dispc_modeset_init(struct tidss_device *tidss)
}
}
- pipes[num_pipes].hw_videoport = i;
- pipes[num_pipes].bridge = bridge;
- pipes[num_pipes].enc_type = enc_type;
- num_pipes++;
+ if (feat->output_port_bus_type[i] == DISPC_VP_OLDI) {
+ if (++num_oldi == 1) {
+ /* Setting up pipe parameters when 1st OLDI port is detected */
+
+ pipes[num_pipes].hw_videoport = i;
+ pipes[num_pipes].enc_type = enc_type;
+
+ /*
+ * Saving the pipe index in case its required for
+ * 2nd OLDI Port.
+ */
+ oldi_pipe_index = num_pipes;
+
+ /*
+ * No additional pipe is required for the 2nd OLDI
+ * port, because the 2nd Encoder -> Bridge connection
+ * is the part of the first OLDI Port pipe.
+ *
+ * num_pipes will only be incremented when the first
+ * OLDI port is discovered.
+ */
+ num_pipes++;
+ }
+
+ /*
+ * Bridge is required to be added only if the detected
+ * port is the first OLDI port or a subsequent port in
+ * Clone Mode.
+ */
+ if (oldi_mode == OLDI_SINGLE_LINK_CLONE_MODE ||
+ num_oldi == 1) {
+ pipes[oldi_pipe_index].bridge[num_oldi - 1] = bridge;
+ pipes[oldi_pipe_index].num_bridges++;
+ }
+ } else {
+ pipes[num_pipes].hw_videoport = i;
+ pipes[num_pipes].bridge[0] = bridge;
+ pipes[num_pipes].num_bridges++;
+ pipes[num_pipes].enc_type = enc_type;
+ num_pipes++;
+ }
}
/* all planes can be on any crtc */
@@ -196,6 +337,7 @@ static int tidss_dispc_modeset_init(struct tidss_device *tidss)
struct tidss_plane *tplane;
struct tidss_crtc *tcrtc;
struct drm_encoder *enc;
+ u32 possible_clones = 0;
u32 hw_plane_id = feat->vid_order[tidss->num_planes];
int ret;
@@ -218,16 +360,24 @@ static int tidss_dispc_modeset_init(struct tidss_device *tidss)
tidss->crtcs[tidss->num_crtcs++] = &tcrtc->crtc;
- enc = tidss_encoder_create(tidss, pipes[i].enc_type,
- 1 << tcrtc->crtc.index);
- if (IS_ERR(enc)) {
- dev_err(tidss->dev, "encoder create failed\n");
- return PTR_ERR(enc);
- }
+ for (j = 0; j < pipes[i].num_bridges; j++) {
+ if (pipes[i].num_bridges > 1)
+ possible_clones = (((1 << pipes[i].num_bridges) - 1)
+ << num_encoders);
+
+ enc = tidss_encoder_create(tidss, pipes[i].enc_type,
+ 1 << tcrtc->crtc.index,
+ possible_clones);
+ if (IS_ERR(enc)) {
+ dev_err(tidss->dev, "encoder create failed\n");
+ return PTR_ERR(enc);
+ }
- ret = drm_bridge_attach(enc, pipes[i].bridge, NULL, 0);
- if (ret)
- return ret;
+ ret = drm_bridge_attach(enc, pipes[i].bridge[j], NULL, 0);
+ if (ret)
+ return ret;
+ }
+ num_encoders += pipes[i].num_bridges;
}
/* create overlay planes of the leftover planes */
--
2.38.1
