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Message-ID: <20250827202354.2017972-5-nm@ti.com>
Date: Wed, 27 Aug 2025 15:23:53 -0500
From: Nishanth Menon <nm@...com>
To: Conor Dooley <conor+dt@...nel.org>,
Krzysztof Kozlowski
<krzk+dt@...nel.org>,
Rob Herring <robh@...nel.org>, David Airlie
<airlied@...il.com>,
Maxime Ripard <mripard@...nel.org>,
Laurent Pinchart
<Laurent.pinchart@...asonboard.com>,
Neil Armstrong
<neil.armstrong@...aro.org>
CC: <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
<dri-devel@...ts.freedesktop.org>,
Robert Nelson <robertcnelson@...il.com>,
Jason Kridner <jkridner@...gleboard.org>, <afd@...com>,
<tomi.valkeinen@...asonboard.com>, <devarsht@...com>,
<dmitry.baryshkov@....qualcomm.com>, Nishanth Menon <nm@...com>
Subject: [PATCH V5 4/5] drm/bridge: it66121: Use vid/pid to detect the type of chip
The driver knows exactly which version of the chip is present since
the vid/pid is used to enforce a compatibility. Given that some
devices like IT66121 has potentially been replaced with IT66122 mid
production for many platforms, it makes no sense to use the vid/pid
as an enforcement for compatibility. Instead, detect the ID of the
actual chip in use by matching the corresponding vid/pid and drop the
compatible specific lookup table.
Signed-off-by: Nishanth Menon <nm@...com>
Reviewed-by: Andrew Davis <afd@...com>
---
Changes since V4:
- Switched to ARRAY_SIZE, Dropped the null entry
- Picked up Andrew's Reviewed-by
V4: https://lore.kernel.org/all/20250819130807.3322536-5-nm@ti.com/
V3: https://lore.kernel.org/all/20250815034105.1276548-4-nm@ti.com/
V2: https://lore.kernel.org/all/20250813204106.580141-3-nm@ti.com/
drivers/gpu/drm/bridge/ite-it66121.c | 58 ++++++++++++++--------------
1 file changed, 29 insertions(+), 29 deletions(-)
diff --git a/drivers/gpu/drm/bridge/ite-it66121.c b/drivers/gpu/drm/bridge/ite-it66121.c
index cd74f3966560..1b2ef774c770 100644
--- a/drivers/gpu/drm/bridge/ite-it66121.c
+++ b/drivers/gpu/drm/bridge/ite-it66121.c
@@ -312,7 +312,7 @@ struct it66121_ctx {
u8 swl;
bool auto_cts;
} audio;
- const struct it66121_chip_info *info;
+ enum chip_id id;
};
static const struct regmap_range_cfg it66121_regmap_banks[] = {
@@ -402,7 +402,7 @@ static int it66121_configure_afe(struct it66121_ctx *ctx,
if (ret)
return ret;
- if (ctx->info->id == ID_IT66121) {
+ if (ctx->id == ID_IT66121) {
ret = regmap_write_bits(ctx->regmap, IT66121_AFE_IP_REG,
IT66121_AFE_IP_EC1, 0);
if (ret)
@@ -428,7 +428,7 @@ static int it66121_configure_afe(struct it66121_ctx *ctx,
if (ret)
return ret;
- if (ctx->info->id == ID_IT66121) {
+ if (ctx->id == ID_IT66121) {
ret = regmap_write_bits(ctx->regmap, IT66121_AFE_IP_REG,
IT66121_AFE_IP_EC1,
IT66121_AFE_IP_EC1);
@@ -449,7 +449,7 @@ static int it66121_configure_afe(struct it66121_ctx *ctx,
if (ret)
return ret;
- if (ctx->info->id == ID_IT6610) {
+ if (ctx->id == ID_IT6610) {
ret = regmap_write_bits(ctx->regmap, IT66121_AFE_XP_REG,
IT6610_AFE_XP_BYPASS,
IT6610_AFE_XP_BYPASS);
@@ -599,7 +599,7 @@ static int it66121_bridge_attach(struct drm_bridge *bridge,
if (ret)
return ret;
- if (ctx->info->id == ID_IT66121) {
+ if (ctx->id == ID_IT66121) {
ret = regmap_write_bits(ctx->regmap, IT66121_CLK_BANK_REG,
IT66121_CLK_BANK_PWROFF_RCLK, 0);
if (ret)
@@ -748,7 +748,7 @@ static int it66121_bridge_check(struct drm_bridge *bridge,
{
struct it66121_ctx *ctx = container_of(bridge, struct it66121_ctx, bridge);
- if (ctx->info->id == ID_IT6610) {
+ if (ctx->id == ID_IT6610) {
/* The IT6610 only supports these settings */
bridge_state->input_bus_cfg.flags |= DRM_BUS_FLAG_DE_HIGH |
DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
@@ -802,7 +802,7 @@ void it66121_bridge_mode_set(struct drm_bridge *bridge,
if (regmap_write(ctx->regmap, IT66121_HDMI_MODE_REG, IT66121_HDMI_MODE_HDMI))
goto unlock;
- if (ctx->info->id == ID_IT66121 &&
+ if (ctx->id == ID_IT66121 &&
regmap_write_bits(ctx->regmap, IT66121_CLK_BANK_REG,
IT66121_CLK_BANK_PWROFF_TXCLK,
IT66121_CLK_BANK_PWROFF_TXCLK)) {
@@ -815,7 +815,7 @@ void it66121_bridge_mode_set(struct drm_bridge *bridge,
if (it66121_configure_afe(ctx, adjusted_mode))
goto unlock;
- if (ctx->info->id == ID_IT66121 &&
+ if (ctx->id == ID_IT66121 &&
regmap_write_bits(ctx->regmap, IT66121_CLK_BANK_REG,
IT66121_CLK_BANK_PWROFF_TXCLK, 0)) {
goto unlock;
@@ -1498,13 +1498,19 @@ static const char * const it66121_supplies[] = {
"vcn33", "vcn18", "vrf12"
};
+static const struct it66121_chip_info it66xx_chip_info[] = {
+ {.id = ID_IT6610, .vid = 0xca00, .pid = 0x0611 },
+ {.id = ID_IT66121, .vid = 0x4954, .pid = 0x0612 },
+};
+
static int it66121_probe(struct i2c_client *client)
{
u32 revision_id, vendor_ids[2] = { 0 }, device_ids[2] = { 0 };
struct device_node *ep;
- int ret;
+ int ret, i;
struct it66121_ctx *ctx;
struct device *dev = &client->dev;
+ const struct it66121_chip_info *chip_info;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
dev_err(dev, "I2C check functionality failed.\n");
@@ -1522,7 +1528,6 @@ static int it66121_probe(struct i2c_client *client)
ctx->dev = dev;
ctx->client = client;
- ctx->info = i2c_get_match_data(client);
of_property_read_u32(ep, "bus-width", &ctx->bus_width);
of_node_put(ep);
@@ -1568,11 +1573,18 @@ static int it66121_probe(struct i2c_client *client)
revision_id = FIELD_GET(IT66121_REVISION_MASK, device_ids[1]);
device_ids[1] &= IT66121_DEVICE_ID1_MASK;
- if ((vendor_ids[1] << 8 | vendor_ids[0]) != ctx->info->vid ||
- (device_ids[1] << 8 | device_ids[0]) != ctx->info->pid) {
- return -ENODEV;
+ for (i = 0; i < ARRAY_SIZE(it66xx_chip_info); i++) {
+ chip_info = &it66xx_chip_info[i];
+ if ((vendor_ids[1] << 8 | vendor_ids[0]) == chip_info->vid &&
+ (device_ids[1] << 8 | device_ids[0]) == chip_info->pid) {
+ ctx->id = chip_info->id;
+ break;
+ }
}
+ if (i == ARRAY_SIZE(it66xx_chip_info))
+ return -ENODEV;
+
ctx->bridge.of_node = dev->of_node;
ctx->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
ctx->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID;
@@ -1606,28 +1618,16 @@ static void it66121_remove(struct i2c_client *client)
mutex_destroy(&ctx->lock);
}
-static const struct it66121_chip_info it66121_chip_info = {
- .id = ID_IT66121,
- .vid = 0x4954,
- .pid = 0x0612,
-};
-
-static const struct it66121_chip_info it6610_chip_info = {
- .id = ID_IT6610,
- .vid = 0xca00,
- .pid = 0x0611,
-};
-
static const struct of_device_id it66121_dt_match[] = {
- { .compatible = "ite,it6610", &it6610_chip_info },
- { .compatible = "ite,it66121", &it66121_chip_info },
+ { .compatible = "ite,it6610" },
+ { .compatible = "ite,it66121" },
{ }
};
MODULE_DEVICE_TABLE(of, it66121_dt_match);
static const struct i2c_device_id it66121_id[] = {
- { "it6610", (kernel_ulong_t)&it6610_chip_info },
- { "it66121", (kernel_ulong_t)&it66121_chip_info },
+ { .name = "it6610" },
+ { .name = "it66121" },
{ }
};
MODULE_DEVICE_TABLE(i2c, it66121_id);
--
2.47.0
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