From patchwork Tue Mar 10 13:17:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Prabhakar Mahadev Lad X-Patchwork-Id: 210709 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BEEBEC10F27 for ; Tue, 10 Mar 2020 13:17:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A0812208E4 for ; Tue, 10 Mar 2020 13:17:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731436AbgCJNRk (ORCPT ); Tue, 10 Mar 2020 09:17:40 -0400 Received: from relmlor1.renesas.com ([210.160.252.171]:31755 "EHLO relmlie5.idc.renesas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1731383AbgCJNRj (ORCPT ); Tue, 10 Mar 2020 09:17:39 -0400 X-IronPort-AV: E=Sophos;i="5.70,537,1574089200"; d="scan'208";a="41499811" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie5.idc.renesas.com with ESMTP; 10 Mar 2020 22:17:37 +0900 Received: from localhost.localdomain (unknown [10.226.36.204]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id 209F14290415; Tue, 10 Mar 2020 22:17:35 +0900 (JST) From: Lad Prabhakar To: Dave Stevenson , Sakari Ailus , Mauro Carvalho Chehab Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Lad Prabhakar , Lad Prabhakar Subject: [PATCH v4 1/3] media: i2c: imx219: Fix power sequence Date: Tue, 10 Mar 2020 13:17:07 +0000 Message-Id: <1583846229-6799-2-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1583846229-6799-1-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <1583846229-6799-1-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.com> Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org When supporting Rpi Camera v2 Module on the RZ/G2E, found the driver had some issues with rcar mipi-csi driver. The sensor never entered into LP-11 state. The powerup sequence in the datasheet[1] shows the sensor entering into LP-11 in streaming mode, so to fix this issue transitions are performed from "streaming -> standby" in the probe() after power up. With this commit the sensor is able to enter LP-11 mode during power up, as expected by some CSI-2 controllers. [1] https://publiclab.org/system/images/photos/000/023/294/original/ RASPBERRY_PI_CAMERA_V2_DATASHEET_IMX219PQH5_7.0.0_Datasheet_XXX.PDF Signed-off-by: Lad Prabhakar Acked-by: Dave Stevenson --- drivers/media/i2c/imx219.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/media/i2c/imx219.c b/drivers/media/i2c/imx219.c index f1effb5..16010ca 100644 --- a/drivers/media/i2c/imx219.c +++ b/drivers/media/i2c/imx219.c @@ -1224,6 +1224,23 @@ static int imx219_probe(struct i2c_client *client) /* Set default mode to max resolution */ imx219->mode = &supported_modes[0]; + /* sensor doesn't enter LP-11 state upon power up until and unless + * streaming is started, so upon power up switch the modes to: + * streaming -> standby + */ + ret = imx219_write_reg(imx219, IMX219_REG_MODE_SELECT, + IMX219_REG_VALUE_08BIT, IMX219_MODE_STREAMING); + if (ret < 0) + goto error_power_off; + usleep_range(100, 110); + + /* put sensor back to standby mode */ + ret = imx219_write_reg(imx219, IMX219_REG_MODE_SELECT, + IMX219_REG_VALUE_08BIT, IMX219_MODE_STANDBY); + if (ret < 0) + goto error_power_off; + usleep_range(100, 110); + ret = imx219_init_controls(imx219); if (ret) goto error_power_off;