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, let us detect the ID of the actual chip in use by matching the corresponding vid/pid.
This also allows for some future compatibility to be checked only against a restricted set of vid/pid. While at this, fix up a bit of formatting errors reported by checkpatch warning, and since the ctx info just requires the id, drop storing the entire chip_info pointer. Signed-off-by: Nishanth Menon <n...@ti.com> --- Changes in V3: * Converted the patch to lookup ID based on vid/pid match rather than enforcing vid/pid match per compatible. * Squashed a formating fix for pre-existing checkpatch --strict warning V2: https://lore.kernel.org/all/20250813204106.580141-3...@ti.com/ drivers/gpu/drm/bridge/ite-it66121.c | 53 ++++++++++++++-------------- 1 file changed, 27 insertions(+), 26 deletions(-) diff --git a/drivers/gpu/drm/bridge/ite-it66121.c b/drivers/gpu/drm/bridge/ite-it66121.c index 9b8ed2fae2f4..5ac9631bcd9a 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; @@ -1505,6 +1505,7 @@ static int it66121_probe(struct i2c_client *client) int ret; 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 +1523,7 @@ static int it66121_probe(struct i2c_client *client) ctx->dev = dev; ctx->client = client; - ctx->info = i2c_get_match_data(client); + chip_info = i2c_get_match_data(client); of_property_read_u32(ep, "bus-width", &ctx->bus_width); of_node_put(ep); @@ -1568,11 +1569,17 @@ 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 (; chip_info->vid; chip_info++) { + 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 (!chip_info->vid) + 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 +1613,22 @@ 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 it66121_chip_info it66xx_chip_info[] = { + {.id = ID_IT66121, .vid = 0x4954, .pid = 0x0612 }, + {.id = ID_IT6610, .vid = 0xca00, .pid = 0x0611 }, + { } }; static const struct of_device_id it66121_dt_match[] = { - { .compatible = "ite,it66121", &it66121_chip_info }, - { .compatible = "ite,it6610", &it6610_chip_info }, + { .compatible = "ite,it66121", &it66xx_chip_info }, + { .compatible = "ite,it6610", &it66xx_chip_info }, { } }; MODULE_DEVICE_TABLE(of, it66121_dt_match); static const struct i2c_device_id it66121_id[] = { - { "it66121", (kernel_ulong_t) &it66121_chip_info }, - { "it6610", (kernel_ulong_t) &it6610_chip_info }, + { "it66121", (kernel_ulong_t)&it66xx_chip_info }, + { "it6610", (kernel_ulong_t)&it66xx_chip_info }, { } }; MODULE_DEVICE_TABLE(i2c, it66121_id); -- 2.47.0
