From patchwork Fri Nov 13 03:06:57 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bingbu Cao X-Patchwork-Id: 11902445 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8AD0616C1 for ; Fri, 13 Nov 2020 03:09:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6CD1820B80 for ; Fri, 13 Nov 2020 03:09:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726055AbgKMDJ4 (ORCPT ); Thu, 12 Nov 2020 22:09:56 -0500 Received: from mga02.intel.com ([134.134.136.20]:20339 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725965AbgKMDJz (ORCPT ); Thu, 12 Nov 2020 22:09:55 -0500 IronPort-SDR: wCcPwpmpfrpfK5mmfnOXmhF/VKbR47npkBbDh8XZA0gP0mkYCTJ9EukIjidaDKTxfRuwveoAld 0OWWae1rfKuw== X-IronPort-AV: E=McAfee;i="6000,8403,9803"; a="157439079" X-IronPort-AV: E=Sophos;i="5.77,473,1596524400"; d="scan'208";a="157439079" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Nov 2020 19:09:54 -0800 IronPort-SDR: Gm4Ue6rG1j1BqRP2TM9misU5S7Mn6wdJwyzIyg+d/rE/rc4vcyITW1lSq+O9AfBl3QdzYcyU7Q lLHPwYCRqJQg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.77,473,1596524400"; d="scan'208";a="532410023" Received: from ipu5-build.bj.intel.com ([10.238.232.196]) by fmsmga005.fm.intel.com with ESMTP; 12 Nov 2020 19:09:52 -0800 From: Bingbu Cao To: linux-media@vger.kernel.org, sakari.ailus@linux.intel.com, tfiga@chromium.org Cc: senozhatsky@chromium.org, bingbu.cao@intel.com, bingbu.cao@linux.intel.com Subject: [PATCH v4 1/2] media: ov2740: only do OTP data read on demand from user Date: Fri, 13 Nov 2020 11:06:57 +0800 Message-Id: <1605236818-25292-1-git-send-email-bingbu.cao@intel.com> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org OTP data access of ov2740 in probe need power up, it may cause the camera flash LED blink during probe if the LED use same power rail with camera, this patch move the OTP data access out of probe, it will only occur on demand from user by nvmem sysfs. Signed-off-by: Bingbu Cao Signed-off-by: Qingwu Zhang Reviewed-by: Tomasz Figa --- drivers/media/i2c/ov2740.c | 116 ++++++++++++++++++++++++++++++++------------- 1 file changed, 84 insertions(+), 32 deletions(-) diff --git a/drivers/media/i2c/ov2740.c b/drivers/media/i2c/ov2740.c index 64ecb6917dd3..16a1e4e16dd8 100644 --- a/drivers/media/i2c/ov2740.c +++ b/drivers/media/i2c/ov2740.c @@ -71,9 +71,10 @@ #define OV2740_REG_OTP_CUSTOMER 0x7010 struct nvm_data { - char *nvm_buffer; + struct i2c_client *client; struct nvmem_device *nvmem; struct regmap *regmap; + char *nvm_buffer; }; enum { @@ -335,6 +336,9 @@ struct ov2740 { /* Streaming on/off */ bool streaming; + + /* NVM data inforamtion */ + struct nvm_data *nvm; }; static inline struct ov2740 *to_ov2740(struct v4l2_subdev *subdev) @@ -930,45 +934,57 @@ static int ov2740_remove(struct i2c_client *client) return 0; } -static int ov2740_load_otp_data(struct i2c_client *client, struct nvm_data *nvm) +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 exit; + 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 exit; + 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 write ISP CTRL00\n"); - goto exit; + 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 write ISP CTRL01\n"); - goto exit; + 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 start streaming\n"); - goto exit; + dev_err(&client->dev, "failed to set streaming mode\n"); + goto err; } /* @@ -981,15 +997,33 @@ static int ov2740_load_otp_data(struct i2c_client *client, struct nvm_data *nvm) nvm->nvm_buffer, CUSTOMER_USE_OTP_SIZE); if (ret) { dev_err(&client->dev, "failed to read OTP data, ret %d\n", ret); - goto exit; + 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; } - ov2740_write_reg(ov2740, OV2740_REG_MODE_SELECT, 1, - OV2740_MODE_STANDBY); - ov2740_write_reg(ov2740, OV2740_REG_ISP_CTRL01, 1, isp_ctrl01); - ov2740_write_reg(ov2740, OV2740_REG_ISP_CTRL00, 1, isp_ctrl00); + 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; -exit: return ret; } @@ -997,29 +1031,48 @@ static int ov2740_nvmem_read(void *priv, unsigned int off, void *val, size_t count) { struct nvm_data *nvm = priv; + struct v4l2_subdev *sd = i2c_get_clientdata(nvm->client); + struct device *dev = &nvm->client->dev; + struct ov2740 *ov2740 = to_ov2740(sd); + int ret = 0; - memcpy(val, nvm->nvm_buffer + off, count); + mutex_lock(&ov2740->mutex); - return 0; + if (nvm->nvm_buffer) { + memcpy(val, nvm->nvm_buffer + off, count); + goto exit; + } + + ret = pm_runtime_get_sync(dev); + if (ret < 0) { + pm_runtime_put_noidle(dev); + goto exit; + } + + ret = ov2740_load_otp_data(nvm); + if (!ret) + memcpy(val, nvm->nvm_buffer + off, count); + + pm_runtime_put(dev); +exit: + mutex_unlock(&ov2740->mutex); + return ret; } -static int ov2740_register_nvmem(struct i2c_client *client) +static int ov2740_register_nvmem(struct i2c_client *client, + struct ov2740 *ov2740) { struct nvm_data *nvm; struct regmap_config regmap_config = { }; struct nvmem_config nvmem_config = { }; struct regmap *regmap; struct device *dev = &client->dev; - int ret = 0; + int ret; nvm = devm_kzalloc(dev, sizeof(*nvm), GFP_KERNEL); if (!nvm) return -ENOMEM; - nvm->nvm_buffer = devm_kzalloc(dev, CUSTOMER_USE_OTP_SIZE, GFP_KERNEL); - if (!nvm->nvm_buffer) - return -ENOMEM; - regmap_config.val_bits = 8; regmap_config.reg_bits = 16; regmap_config.disable_locking = true; @@ -1028,12 +1081,7 @@ static int ov2740_register_nvmem(struct i2c_client *client) return PTR_ERR(regmap); nvm->regmap = regmap; - - ret = ov2740_load_otp_data(client, nvm); - if (ret) { - dev_err(dev, "failed to load OTP data, ret %d\n", ret); - return ret; - } + nvm->client = client; nvmem_config.name = dev_name(dev); nvmem_config.dev = dev; @@ -1051,7 +1099,11 @@ static int ov2740_register_nvmem(struct i2c_client *client) nvm->nvmem = devm_nvmem_register(dev, &nvmem_config); - return PTR_ERR_OR_ZERO(nvm->nvmem); + ret = PTR_ERR_OR_ZERO(nvm->nvmem); + if (!ret) + ov2740->nvm = nvm; + + return ret; } static int ov2740_probe(struct i2c_client *client) @@ -1103,7 +1155,7 @@ static int ov2740_probe(struct i2c_client *client) goto probe_error_media_entity_cleanup; } - ret = ov2740_register_nvmem(client); + ret = ov2740_register_nvmem(client, ov2740); if (ret) dev_warn(&client->dev, "register nvmem failed, ret %d\n", ret);