Loongson ML5B_MA board using ITE IT66121 HDMI transmitter to support HDMI
display output, with the vbios provided the necessary information, we are
able to create a minimal drm bridge driver for it. After apply this patch
we are able to change mode freely.
Tested on LS3A5000+LS7A1000 ML5B_MA board.
$ dmesg | grep drm
[drm] dc: 264MHz, gmc: 529MHz, gpu: 529MHz
[drm] Dedicated vram start: 0xe0030000000, size: 64MiB
[drm] Loongson VBIOS version: 0.3
[drm] Loongson VBIOS: has 8 DCBs
[drm] VRAM: 4096 pages ready
[drm] GTT: 32768 pages ready
[drm] lsdc-i2c0(sda pin mask=1, scl pin mask=2) created
[drm] lsdc-i2c1(sda pin mask=4, scl pin mask=8) created
[drm] DisplayPipe-0 has DVO-0
[drm] device address(0x4d) is not correct
[drm] i2c client IT66121@0x4c created
[drm] IT66121 attached, Vendor ID: 0x4954, Device ID: 0x612
[drm] Total 2 outputs
[drm] registered irq: 40
[drm] Initialized loongson 1.0.0 20220701 for 0000:00:06.1 on minor 0
loongson 0000:00:06.1: [drm] fb0: loongsondrmfb frame buffer device
Signed-off-by: Sui Jingfeng <suijingf...@loongson.cn>
---
drivers/gpu/drm/loongson/lsdc_output_7a1000.c | 144 +++++++-----------
1 file changed, 55 insertions(+), 89 deletions(-)
diff --git a/drivers/gpu/drm/loongson/lsdc_output_7a1000.c
b/drivers/gpu/drm/loongson/lsdc_output_7a1000.c
index 6fc8dd1c7d9a..e12f9a0157d0 100644
--- a/drivers/gpu/drm/loongson/lsdc_output_7a1000.c
+++ b/drivers/gpu/drm/loongson/lsdc_output_7a1000.c
@@ -10,6 +10,7 @@
#include "lsdc_drv.h"
#include "lsdc_output.h"
+#include "ite_it66121.h"
/*
* The display controller in the LS7A1000 exports two DVO interfaces, thus
* external encoder is required, except connected to the DPI panel directly.
@@ -38,68 +39,6 @@
* TODO: Add support for non-transparent encoders
*/
-static int ls7a1000_dpi_connector_get_modes(struct drm_connector *conn)
-{
- unsigned int num = 0;
- struct edid *edid;
-
- if (conn->ddc) {
- edid = drm_get_edid(conn, conn->ddc);
- if (edid) {
- drm_connector_update_edid_property(conn, edid);
- num = drm_add_edid_modes(conn, edid);
- kfree(edid);
- }
-
- return num;
- }
-
- num = drm_add_modes_noedid(conn, 1920, 1200);
-
- drm_set_preferred_mode(conn, 1024, 768);
-
- return num;
-}
-
-static struct drm_encoder *
-ls7a1000_dpi_connector_get_best_encoder(struct drm_connector *connector,
- struct drm_atomic_state *state)
-{
- struct lsdc_output *output = connector_to_lsdc_output(connector);
-
- return &output->encoder;
-}
-
-static const struct drm_connector_helper_funcs
-ls7a1000_dpi_connector_helpers = {
- .atomic_best_encoder = ls7a1000_dpi_connector_get_best_encoder,
- .get_modes = ls7a1000_dpi_connector_get_modes,
-};
-
-static enum drm_connector_status
-ls7a1000_dpi_connector_detect(struct drm_connector *connector, bool force)
-{
- struct i2c_adapter *ddc = connector->ddc;
-
- if (ddc) {
- if (drm_probe_ddc(ddc))
- return connector_status_connected;
-
- return connector_status_disconnected;
- }
-
- return connector_status_unknown;
-}
-
-static const struct drm_connector_funcs ls7a1000_dpi_connector_funcs = {
- .detect = ls7a1000_dpi_connector_detect,
- .fill_modes = drm_helper_probe_single_connector_modes,
- .destroy = drm_connector_cleanup,
- .reset = drm_atomic_helper_connector_reset,
- .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
- .atomic_destroy_state = drm_atomic_helper_connector_destroy_state
-};
-
static void ls7a1000_pipe0_encoder_reset(struct drm_encoder *encoder)
{
struct drm_device *ddev = encoder->dev;
@@ -139,40 +78,67 @@ static const struct drm_encoder_funcs
ls7a1000_encoder_funcs[2] = {
},
};
+/*
+ * This is a default output description for LS7A1000/LS2K1000, this is always
+ * true from the hardware perspective. It is just that when there are external
+ * display bridge connected, this description no longer complete. As it cannot
+ * describe the topology about the external encoders.
+ */
+static const struct lsdc_output_desc ls7a1000_output_desc[2] = {
+ {
+ .pipe = 0,
+ .encoder_type = DRM_MODE_ENCODER_DPI,
+ .connector_type = DRM_MODE_CONNECTOR_DPI,
+ .encoder_funcs = &ls7a1000_encoder_funcs[0],
+ .encoder_helper_funcs = &lsdc_encoder_helper_funcs,
+ .connector_funcs = &lsdc_connector_funcs,
+ .connector_helper_funcs = &lsdc_connector_helper_funcs,
+ .name = "DVO-0",
+ },
+ {
+ .pipe = 1,
+ .encoder_type = DRM_MODE_ENCODER_DPI,
+ .connector_type = DRM_MODE_CONNECTOR_DPI,
+ .encoder_funcs = &ls7a1000_encoder_funcs[1],
+ .encoder_helper_funcs = &lsdc_encoder_helper_funcs,
+ .connector_funcs = &lsdc_connector_funcs,
+ .connector_helper_funcs = &lsdc_connector_helper_funcs,
+ .name = "DVO-1",
+ },
+};
+
int ls7a1000_output_init(struct drm_device *ddev,
struct lsdc_display_pipe *dispipe,
struct i2c_adapter *ddc,
unsigned int index)
{
struct lsdc_output *output = &dispipe->output;
- struct drm_encoder *encoder = &output->encoder;
- struct drm_connector *connector = &output->connector;
- int ret;
-
- ret = drm_encoder_init(ddev, encoder, &ls7a1000_encoder_funcs[index],
- DRM_MODE_ENCODER_TMDS, "encoder-%u", index);
- if (ret)
- return ret;
-
- encoder->possible_crtcs = BIT(index);
-
- ret = drm_connector_init_with_ddc(ddev, connector,
- &ls7a1000_dpi_connector_funcs,
- DRM_MODE_CONNECTOR_DPI, ddc);
- if (ret)
- return ret;
-
- drm_info(ddev, "display pipe-%u has a DVO\n", index);
-
- drm_connector_helper_add(connector, &ls7a1000_dpi_connector_helpers);
-
- drm_connector_attach_encoder(connector, encoder);
+ enum loongson_vbios_encoder_name encoder_name = 0;
+ struct drm_bridge *bridge = NULL;
+ u8 slave_addr;
+ bool ret;
+
+ output->descp = &ls7a1000_output_desc[index];
+
+ ret = loongson_vbios_query_encoder_info(ddev, index, NULL,
+ &encoder_name, &slave_addr);
+ if (!ret)
+ goto skip;
+
+ switch (encoder_name) {
+ case ENCODER_CHIP_IT66121:
+ bridge = it66121_bridge_create(ddev, ddc, slave_addr, false,
+ 0, index);
+ break;
+ default:
+ break;
+ }
- connector->polled = DRM_CONNECTOR_POLL_CONNECT |
- DRM_CONNECTOR_POLL_DISCONNECT;
+ if (IS_ERR(bridge))
+ goto skip;
- connector->interlace_allowed = 0;
- connector->doublescan_allowed = 0;
+ output->bridge = bridge;
- return 0;
+skip:
+ return lsdc_output_init(ddev, dispipe, ddc, index);
}
--
2.34.1
