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Subject[PATCH v2 2/2] drm/bridge: fsl-ldb: Add i.MX93 LDB support
Date
Same to i.MX8mp LDB, i.MX93 LDB is controlled by mediamix blk-ctrl
through LDB_CTRL and LVDS_CTRL registers. i.MX93 LDB supports only
one LVDS channel(channel 0) and it's LVDS_CTRL register bit1 is used
as LVDS_EN instead of CH1_EN. Add i.MX93 LDB support in the existing
i.MX8mp LDB bridge driver by adding i.MX93 LDB compatible string and
device data(to reflect different register offsets and LVDS_CTRL register
bit1 definition).

Signed-off-by: Liu Ying <victor.liu@nxp.com>
---
v1->v2:
* No change.

drivers/gpu/drm/bridge/fsl-ldb.c | 53 ++++++++++++++++++++++++++------
1 file changed, 44 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/bridge/fsl-ldb.c b/drivers/gpu/drm/bridge/fsl-ldb.c
index 9bcba8fc57e7..6ad63ac7367c 100644
--- a/drivers/gpu/drm/bridge/fsl-ldb.c
+++ b/drivers/gpu/drm/bridge/fsl-ldb.c
@@ -18,7 +18,6 @@
#include <drm/drm_of.h>
#include <drm/drm_panel.h>

-#define LDB_CTRL 0x5c
#define LDB_CTRL_CH0_ENABLE BIT(0)
#define LDB_CTRL_CH0_DI_SELECT BIT(1)
#define LDB_CTRL_CH1_ENABLE BIT(2)
@@ -35,9 +34,9 @@
#define LDB_CTRL_ASYNC_FIFO_ENABLE BIT(24)
#define LDB_CTRL_ASYNC_FIFO_THRESHOLD_MASK GENMASK(27, 25)

-#define LVDS_CTRL 0x128
#define LVDS_CTRL_CH0_EN BIT(0)
#define LVDS_CTRL_CH1_EN BIT(1)
+#define LVDS_CTRL_LVDS_EN BIT(1)
#define LVDS_CTRL_VBG_EN BIT(2)
#define LVDS_CTRL_HS_EN BIT(3)
#define LVDS_CTRL_PRE_EMPH_EN BIT(4)
@@ -52,6 +51,29 @@
#define LVDS_CTRL_VBG_ADJ(n) (((n) & 0x7) << 17)
#define LVDS_CTRL_VBG_ADJ_MASK GENMASK(19, 17)

+enum fsl_ldb_devtype {
+ IMX8MP_LDB,
+ IMX93_LDB,
+};
+
+struct fsl_ldb_devdata {
+ u32 ldb_ctrl;
+ u32 lvds_ctrl;
+ bool lvds_en_bit;
+};
+
+static const struct fsl_ldb_devdata fsl_ldb_devdata[] = {
+ [IMX8MP_LDB] = {
+ .ldb_ctrl = 0x5c,
+ .lvds_ctrl = 0x128,
+ },
+ [IMX93_LDB] = {
+ .ldb_ctrl = 0x20,
+ .lvds_ctrl = 0x24,
+ .lvds_en_bit = true,
+ },
+};
+
struct fsl_ldb {
struct device *dev;
struct drm_bridge bridge;
@@ -59,6 +81,7 @@ struct fsl_ldb {
struct clk *clk;
struct regmap *regmap;
bool lvds_dual_link;
+ const struct fsl_ldb_devdata *devdata;
};

static inline struct fsl_ldb *to_fsl_ldb(struct drm_bridge *bridge)
@@ -173,12 +196,12 @@ static void fsl_ldb_atomic_enable(struct drm_bridge *bridge,
reg |= LDB_CTRL_DI1_VSYNC_POLARITY;
}

- regmap_write(fsl_ldb->regmap, LDB_CTRL, reg);
+ regmap_write(fsl_ldb->regmap, fsl_ldb->devdata->ldb_ctrl, reg);

/* Program LVDS_CTRL */
reg = LVDS_CTRL_CC_ADJ(2) | LVDS_CTRL_PRE_EMPH_EN |
LVDS_CTRL_PRE_EMPH_ADJ(3) | LVDS_CTRL_VBG_EN;
- regmap_write(fsl_ldb->regmap, LVDS_CTRL, reg);
+ regmap_write(fsl_ldb->regmap, fsl_ldb->devdata->lvds_ctrl, reg);

/* Wait for VBG to stabilize. */
usleep_range(15, 20);
@@ -187,7 +210,7 @@ static void fsl_ldb_atomic_enable(struct drm_bridge *bridge,
if (fsl_ldb->lvds_dual_link)
reg |= LVDS_CTRL_CH1_EN;

- regmap_write(fsl_ldb->regmap, LVDS_CTRL, reg);
+ regmap_write(fsl_ldb->regmap, fsl_ldb->devdata->lvds_ctrl, reg);
}

static void fsl_ldb_atomic_disable(struct drm_bridge *bridge,
@@ -195,9 +218,14 @@ static void fsl_ldb_atomic_disable(struct drm_bridge *bridge,
{
struct fsl_ldb *fsl_ldb = to_fsl_ldb(bridge);

- /* Stop both channels. */
- regmap_write(fsl_ldb->regmap, LVDS_CTRL, 0);
- regmap_write(fsl_ldb->regmap, LDB_CTRL, 0);
+ /* Stop channel(s). */
+ if (fsl_ldb->devdata->lvds_en_bit)
+ /* Set LVDS_CTRL_LVDS_EN bit to disable. */
+ regmap_write(fsl_ldb->regmap, fsl_ldb->devdata->lvds_ctrl,
+ LVDS_CTRL_LVDS_EN);
+ else
+ regmap_write(fsl_ldb->regmap, fsl_ldb->devdata->lvds_ctrl, 0);
+ regmap_write(fsl_ldb->regmap, fsl_ldb->devdata->ldb_ctrl, 0);

clk_disable_unprepare(fsl_ldb->clk);
}
@@ -263,6 +291,10 @@ static int fsl_ldb_probe(struct platform_device *pdev)
if (!fsl_ldb)
return -ENOMEM;

+ fsl_ldb->devdata = of_device_get_match_data(dev);
+ if (!fsl_ldb->devdata)
+ return -EINVAL;
+
fsl_ldb->dev = &pdev->dev;
fsl_ldb->bridge.funcs = &funcs;
fsl_ldb->bridge.of_node = dev->of_node;
@@ -321,7 +353,10 @@ static int fsl_ldb_remove(struct platform_device *pdev)
}

static const struct of_device_id fsl_ldb_match[] = {
- { .compatible = "fsl,imx8mp-ldb", },
+ { .compatible = "fsl,imx8mp-ldb",
+ .data = &fsl_ldb_devdata[IMX8MP_LDB], },
+ { .compatible = "fsl,imx93-ldb",
+ .data = &fsl_ldb_devdata[IMX93_LDB], },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, fsl_ldb_match);
--
2.37.1
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