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drm/bridge: lt9611: Add support for single Port B input

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The LT9611 has two DSI input ports. The driver currently assumes Port A
is always used for single-port configurations. However, some boards
connect DSI to Port B only.

Update the driver to detect which ports are populated from devicetree
and configure the hardware accordingly:

- If only port@1 (Port B) is populated, configure port swap (0x8303
  bit 6) and byte_clk source (0x8250 bit 3:2) for Port B operation
- If both ports are populated, use dual-port mode (Port A + B)
- If only port@0 (Port A) is populated, use single Port A (existing
  behavior)

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Hongyang Zhao <hongyang.zhao@thundersoft.com>
Reviewed-by: Roger Shimizu <rosh@debian.org>
Tested-by: Roger Shimizu <rosh@debian.org>
Link: https://patch.msgid.link/20260207-rubikpi-next-20260116-v3-2-23b9aa189a3a@thundersoft.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
This commit is contained in:
Hongyang Zhao
2026-02-07 15:32:55 +08:00
committed by Dmitry Baryshkov
parent 5ae47f510f
commit e8bd92c4a0
1 changed files with 32 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

46
drivers/gpu/drm/bridge/lontium-lt9611.c
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@@ -116,12 +116,25 @@ static int lt9611_mipi_input_digital(struct lt9611 *lt9611,
{ 0x830a, 0x00 },
{ 0x824f, 0x80 },
{ 0x8250, 0x10 },
{ 0x8303, 0x00 },
{ 0x8302, 0x0a },
{ 0x8306, 0x0a },
};
if (lt9611->dsi1_node)
reg_cfg[1].def = 0x03;
if (lt9611->dsi1_node) {
if (lt9611->dsi0_node) {
/* Dual port (Port A + B) */
reg_cfg[1].def = 0x03;
} else {
/*
* Single port B:
* - 0x8303 bit 6: port swap (1=PortB as primary)
* - 0x8250 bit 3:2: byte_clk source (01=PortB)
*/
reg_cfg[3].def = 0x14;
reg_cfg[4].def = 0x40;
}
}
return regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
}
@@ -202,7 +215,9 @@ static void lt9611_pcr_setup(struct lt9611 *lt9611, const struct drm_display_mod
regmap_write(lt9611->regmap, 0x831d, pol);
regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
if (lt9611->dsi1_node) {
/* dual port: configure hact for combining two DSI inputs */
if (lt9611->dsi0_node && lt9611->dsi1_node) {
unsigned int hact = mode->hdisplay;
hact >>= 2;
@@ -759,7 +774,8 @@ static enum drm_mode_status lt9611_bridge_mode_valid(struct drm_bridge *bridge,
if (mode->hdisplay > 3840)
return MODE_BAD_HVALUE;
if (mode->hdisplay > 2000 && !lt9611->dsi1_node)
/* high resolution requires dual port (Port A + B) */
if (mode->hdisplay > 2000 && !(lt9611->dsi0_node && lt9611->dsi1_node))
return MODE_PANEL;
return MODE_OK;
@@ -1033,13 +1049,13 @@ static int lt9611_parse_dt(struct device *dev,
struct lt9611 *lt9611)
{
lt9611->dsi0_node = of_graph_get_remote_node(dev->of_node, 0, -1);
if (!lt9611->dsi0_node) {
dev_err(lt9611->dev, "failed to get remote node for primary dsi\n");
lt9611->dsi1_node = of_graph_get_remote_node(dev->of_node, 1, -1);
if (!lt9611->dsi0_node && !lt9611->dsi1_node) {
dev_err(lt9611->dev, "failed to get remote node for dsi\n");
return -ENODEV;
}
lt9611->dsi1_node = of_graph_get_remote_node(dev->of_node, 1, -1);
lt9611->ac_mode = of_property_read_bool(dev->of_node, "lt,ac-mode");
return drm_of_find_panel_or_bridge(dev->of_node, 2, -1, NULL, &lt9611->next_bridge);
@@ -1161,14 +1177,16 @@ static int lt9611_probe(struct i2c_client *client)
drm_bridge_add(&lt9611->bridge);
/* Attach primary DSI */
lt9611->dsi0 = lt9611_attach_dsi(lt9611, lt9611->dsi0_node);
if (IS_ERR(lt9611->dsi0)) {
ret = PTR_ERR(lt9611->dsi0);
goto err_remove_bridge;
/* Attach primary DSI (directly drives or Port A in dual-port mode) */
if (lt9611->dsi0_node) {
lt9611->dsi0 = lt9611_attach_dsi(lt9611, lt9611->dsi0_node);
if (IS_ERR(lt9611->dsi0)) {
ret = PTR_ERR(lt9611->dsi0);
goto err_remove_bridge;
}
}
/* Attach secondary DSI, if specified */
/* Attach secondary DSI (Port B in single or dual-port mode) */
if (lt9611->dsi1_node) {
lt9611->dsi1 = lt9611_attach_dsi(lt9611, lt9611->dsi1_node);
if (IS_ERR(lt9611->dsi1)) {