The LT9611 has two DSI input ports. The driver currently hardcodes Port A or Port A+B, but some boards connect DSI to Port B only.
Add device tree property "lontium,dsi-port-b" to select Port B as the DSI input source. When set, configure port swap (0x8303 bit 6) and byte_clk source (0x8250 bit 3:2) for Port B. Signed-off-by: Hongyang Zhao <[email protected]> Reviewed-by: Roger Shimizu <[email protected]> --- drivers/gpu/drm/bridge/lontium-lt9611.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c index a2d032ee4744..178f056c9e85 100644 --- a/drivers/gpu/drm/bridge/lontium-lt9611.c +++ b/drivers/gpu/drm/bridge/lontium-lt9611.c @@ -47,6 +47,7 @@ struct lt9611 { struct mipi_dsi_device *dsi1; bool ac_mode; + bool dsi_port_b; struct gpio_desc *reset_gpio; struct gpio_desc *enable_gpio; @@ -116,6 +117,7 @@ static int lt9611_mipi_input_digital(struct lt9611 *lt9611, { 0x830a, 0x00 }, { 0x824f, 0x80 }, { 0x8250, 0x10 }, + { 0x8303, 0x00 }, { 0x8302, 0x0a }, { 0x8306, 0x0a }, }; @@ -123,6 +125,16 @@ static int lt9611_mipi_input_digital(struct lt9611 *lt9611, if (lt9611->dsi1_node) reg_cfg[1].def = 0x03; + /* + * Select DSI input port: + * - 0x8303 bit 6: port swap (0=PortA, 1=PortB) + * - 0x8250 bit 3:2: byte_clk source (00=PortA, 01=PortB) + */ + if (lt9611->dsi_port_b) { + reg_cfg[3].def = 0x14; + reg_cfg[4].def = 0x40; + } + return regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg)); } @@ -1024,6 +1036,8 @@ static int lt9611_parse_dt(struct device *dev, lt9611->ac_mode = of_property_read_bool(dev->of_node, "lt,ac-mode"); + lt9611->dsi_port_b = of_property_read_bool(dev->of_node, "lontium,dsi-port-b"); + return drm_of_find_panel_or_bridge(dev->of_node, 2, -1, NULL, <9611->next_bridge); } -- 2.43.0
