From 5e6fd339b68df81f35a70b4aa0501e3eec1dd2de Mon Sep 17 00:00:00 2001 From: Bingbu Cao Date: Fri, 13 Nov 2020 04:06:58 +0100 Subject: [PATCH] media: ov2740: allow OTP data access during streaming OTP data access of ov2740 need enable the streaming mode to load and it could be done in any time, so driver need allow the OTP data access during streaming instead of return EBUSY, this patch try to read the OTP data out in STREAMON if OTP data is not ready before first time streaming start. Signed-off-by: Bingbu Cao Signed-off-by: Qingwu Zhang Reviewed-by: Tomasz Figa Signed-off-by: Sakari Ailus Signed-off-by: Mauro Carvalho Chehab --- drivers/media/i2c/ov2740.c | 189 +++++++++++++++++++------------------ 1 file changed, 96 insertions(+), 93 deletions(-) diff --git a/drivers/media/i2c/ov2740.c b/drivers/media/i2c/ov2740.c index 16a1e4e16dd8..99016546cbec 100644 --- a/drivers/media/i2c/ov2740.c +++ b/drivers/media/i2c/ov2740.c @@ -598,13 +598,109 @@ static void ov2740_update_pad_format(const struct ov2740_mode *mode, fmt->field = V4L2_FIELD_NONE; } +static int ov2740_load_otp_data(struct nvm_data *nvm) +{ + struct i2c_client *client = nvm->client; + struct ov2740 *ov2740 = to_ov2740(i2c_get_clientdata(client)); + u32 isp_ctrl00 = 0; + u32 isp_ctrl01 = 0; + int ret; + + if (!nvm) + return -EINVAL; + + if (nvm->nvm_buffer) + return 0; + + nvm->nvm_buffer = kzalloc(CUSTOMER_USE_OTP_SIZE, GFP_KERNEL); + if (!nvm->nvm_buffer) + return -ENOMEM; + + ret = ov2740_read_reg(ov2740, OV2740_REG_ISP_CTRL00, 1, &isp_ctrl00); + if (ret) { + dev_err(&client->dev, "failed to read ISP CTRL00\n"); + goto err; + } + + ret = ov2740_read_reg(ov2740, OV2740_REG_ISP_CTRL01, 1, &isp_ctrl01); + if (ret) { + dev_err(&client->dev, "failed to read ISP CTRL01\n"); + goto err; + } + + /* Clear bit 5 of ISP CTRL00 */ + ret = ov2740_write_reg(ov2740, OV2740_REG_ISP_CTRL00, 1, + isp_ctrl00 & ~BIT(5)); + if (ret) { + dev_err(&client->dev, "failed to set ISP CTRL00\n"); + goto err; + } + + /* Clear bit 7 of ISP CTRL01 */ + ret = ov2740_write_reg(ov2740, OV2740_REG_ISP_CTRL01, 1, + isp_ctrl01 & ~BIT(7)); + if (ret) { + dev_err(&client->dev, "failed to set ISP CTRL01\n"); + goto err; + } + + ret = ov2740_write_reg(ov2740, OV2740_REG_MODE_SELECT, 1, + OV2740_MODE_STREAMING); + if (ret) { + dev_err(&client->dev, "failed to set streaming mode\n"); + goto err; + } + + /* + * Users are not allowed to access OTP-related registers and memory + * during the 20 ms period after streaming starts (0x100 = 0x01). + */ + msleep(20); + + ret = regmap_bulk_read(nvm->regmap, OV2740_REG_OTP_CUSTOMER, + nvm->nvm_buffer, CUSTOMER_USE_OTP_SIZE); + if (ret) { + dev_err(&client->dev, "failed to read OTP data, ret %d\n", ret); + goto err; + } + + ret = ov2740_write_reg(ov2740, OV2740_REG_MODE_SELECT, 1, + OV2740_MODE_STANDBY); + if (ret) { + dev_err(&client->dev, "failed to set streaming mode\n"); + goto err; + } + + ret = ov2740_write_reg(ov2740, OV2740_REG_ISP_CTRL01, 1, isp_ctrl01); + if (ret) { + dev_err(&client->dev, "failed to set ISP CTRL01\n"); + goto err; + } + + ret = ov2740_write_reg(ov2740, OV2740_REG_ISP_CTRL00, 1, isp_ctrl00); + if (ret) { + dev_err(&client->dev, "failed to set ISP CTRL00\n"); + goto err; + } + + return 0; +err: + kfree(nvm->nvm_buffer); + nvm->nvm_buffer = NULL; + + return ret; +} + static int ov2740_start_streaming(struct ov2740 *ov2740) { struct i2c_client *client = v4l2_get_subdevdata(&ov2740->sd); + struct nvm_data *nvm = ov2740->nvm; const struct ov2740_reg_list *reg_list; int link_freq_index; int ret = 0; + ov2740_load_otp_data(nvm); + link_freq_index = ov2740->cur_mode->link_freq_index; reg_list = &link_freq_configs[link_freq_index].reg_list; ret = ov2740_write_reg_list(ov2740, reg_list); @@ -934,99 +1030,6 @@ static int ov2740_remove(struct i2c_client *client) return 0; } -static int ov2740_load_otp_data(struct nvm_data *nvm) -{ - struct i2c_client *client = nvm->client; - struct ov2740 *ov2740 = to_ov2740(i2c_get_clientdata(client)); - u32 isp_ctrl00 = 0; - u32 isp_ctrl01 = 0; - int ret; - - if (!nvm) - return -EINVAL; - - if (nvm->nvm_buffer) - return 0; - - nvm->nvm_buffer = kzalloc(CUSTOMER_USE_OTP_SIZE, GFP_KERNEL); - if (!nvm->nvm_buffer) - return -ENOMEM; - - ret = ov2740_read_reg(ov2740, OV2740_REG_ISP_CTRL00, 1, &isp_ctrl00); - if (ret) { - dev_err(&client->dev, "failed to read ISP CTRL00\n"); - goto err; - } - - ret = ov2740_read_reg(ov2740, OV2740_REG_ISP_CTRL01, 1, &isp_ctrl01); - if (ret) { - dev_err(&client->dev, "failed to read ISP CTRL01\n"); - goto err; - } - - /* Clear bit 5 of ISP CTRL00 */ - ret = ov2740_write_reg(ov2740, OV2740_REG_ISP_CTRL00, 1, - isp_ctrl00 & ~BIT(5)); - if (ret) { - dev_err(&client->dev, "failed to set ISP CTRL00\n"); - goto err; - } - - /* Clear bit 7 of ISP CTRL01 */ - ret = ov2740_write_reg(ov2740, OV2740_REG_ISP_CTRL01, 1, - isp_ctrl01 & ~BIT(7)); - if (ret) { - dev_err(&client->dev, "failed to set ISP CTRL01\n"); - goto err; - } - - ret = ov2740_write_reg(ov2740, OV2740_REG_MODE_SELECT, 1, - OV2740_MODE_STREAMING); - if (ret) { - dev_err(&client->dev, "failed to set streaming mode\n"); - goto err; - } - - /* - * Users are not allowed to access OTP-related registers and memory - * during the 20 ms period after streaming starts (0x100 = 0x01). - */ - msleep(20); - - ret = regmap_bulk_read(nvm->regmap, OV2740_REG_OTP_CUSTOMER, - nvm->nvm_buffer, CUSTOMER_USE_OTP_SIZE); - if (ret) { - dev_err(&client->dev, "failed to read OTP data, ret %d\n", ret); - goto err; - } - - ret = ov2740_write_reg(ov2740, OV2740_REG_MODE_SELECT, 1, - OV2740_MODE_STANDBY); - if (ret) { - dev_err(&client->dev, "failed to set streaming mode\n"); - goto err; - } - - ret = ov2740_write_reg(ov2740, OV2740_REG_ISP_CTRL01, 1, isp_ctrl01); - if (ret) { - dev_err(&client->dev, "failed to set ISP CTRL01\n"); - goto err; - } - - ret = ov2740_write_reg(ov2740, OV2740_REG_ISP_CTRL00, 1, isp_ctrl00); - if (ret) { - dev_err(&client->dev, "failed to set ISP CTRL00\n"); - goto err; - } - - return 0; -err: - kfree(nvm->nvm_buffer); - nvm->nvm_buffer = NULL; - - return ret; -} - static int ov2740_nvmem_read(void *priv, unsigned int off, void *val, size_t count) {