[PATCH v8 3/9] drm/bridge: fsl-ldb: Add support for i.MX94

Laurentiu Palcu
2026-03-04T11:34:55Z

i.MX94 series LDB controller shares the same LDB and LVDS control
registers as i.MX8MP and i.MX93 but supports a higher maximum clock
frequency.

Add a 'max_clk_khz' member to the fsl_ldb_devdata structure in order to
be able to set different max frequencies for other platforms.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Laurentiu Palcu <laurentiu.palcu@oss.nxp.com>
---
drivers/gpu/drm/bridge/fsl-ldb.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/fsl-ldb.c b/drivers/gpu/drm/bridge/fsl-ldb.c
index d59f26016de26..1b8f65a817a25 100644
--- a/drivers/gpu/drm/bridge/fsl-ldb.c
+++ b/drivers/gpu/drm/bridge/fsl-ldb.c
@@ -57,6 +57,7 @@ enum fsl_ldb_devtype {
IMX6SX_LDB,
IMX8MP_LDB,
IMX93_LDB,
+ IMX94_LDB,
};

struct fsl_ldb_devdata {
@@ -64,21 +65,31 @@ struct fsl_ldb_devdata {
u32 lvds_ctrl;
bool lvds_en_bit;
bool single_ctrl_reg;
+ u32 max_clk_khz;
};

static const struct fsl_ldb_devdata fsl_ldb_devdata[] = {
[IMX6SX_LDB] = {
.ldb_ctrl = 0x18,
.single_ctrl_reg = true,
+ .max_clk_khz = 80000,
},
[IMX8MP_LDB] = {
.ldb_ctrl = 0x5c,
.lvds_ctrl = 0x128,
+ .max_clk_khz = 80000,
},
[IMX93_LDB] = {
.ldb_ctrl = 0x20,
.lvds_ctrl = 0x24,
.lvds_en_bit = true,
+ .max_clk_khz = 80000,
+ },
+ [IMX94_LDB] = {
+ .ldb_ctrl = 0x04,
+ .lvds_ctrl = 0x08,
+ .lvds_en_bit = true,
+ .max_clk_khz = 165000,
},
};

@@ -275,7 +286,7 @@ fsl_ldb_mode_valid(struct drm_bridge *bridge,
{
struct fsl_ldb *fsl_ldb = to_fsl_ldb(bridge);

- if (mode->clock > (fsl_ldb_is_dual(fsl_ldb) ? 160000 : 80000))
+ if (mode->clock > (fsl_ldb_is_dual(fsl_ldb) ? 2 : 1) * fsl_ldb->devdata->max_clk_khz)
return MODE_CLOCK_HIGH;

return MODE_OK;
@@ -384,6 +395,8 @@ static const struct of_device_id fsl_ldb_match[] = {
.data = &fsl_ldb_devdata[IMX8MP_LDB], },
{ .compatible = "fsl,imx93-ldb",
.data = &fsl_ldb_devdata[IMX93_LDB], },
+ { .compatible = "fsl,imx94-ldb",
+ .data = &fsl_ldb_devdata[IMX94_LDB], },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, fsl_ldb_match);

--
2.51.0