From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Jacopo Mondi <jacopo+renesas@jmondi.org>
Cc: kieran.bingham+renesas@ideasonboard.com,
niklas.soderlund+renesas@ragnatech.se, geert@linux-m68k.org,
Mauro Carvalho Chehab <mchehab@kernel.org>,
linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 11/18] media: i2c: rdacm21: Fix OV10640 powerdown
Date: Mon, 15 Mar 2021 23:45:44 +0200 [thread overview]
Message-ID: <YE/ViFp87iNg+6pz@pendragon.ideasonboard.com> (raw)
In-Reply-To: <20210315131512.133720-12-jacopo+renesas@jmondi.org>
Hi Jacopo,
Thank you for the patch.
On Mon, Mar 15, 2021 at 02:15:05PM +0100, Jacopo Mondi wrote:
> The OV10640 image sensor powerdown signal is controlled by the first
> line of the OV490 GPIO pad #1, but the pad #0 identifier
> OV490_GPIO_OUTPUT_VALUE0 was erroneously used. As a result the image
> sensor powerdown signal was never asserted but was kept high by an
> internal pull-up resistor, causing sporadic failures during the
> image sensor startup phase.
>
> Fix this by using the correct GPIO pad identifier.
>
> While at it also fix the GPIO signal handling sequence, as the reset
> line was released before the powerdown one, and introduce the correct
> delays in between the two operations.
>
> Wait the mandatory 1 millisecond delay after the powerup lane is
> asserted. The reset delay is not characterized in the chip manual if
> not as "255 XVCLK + initialization". Wait for at least 3 milliseconds
> to guarantee the SCCB bus is available.
>
> This commit fixes a sporadic start-up error triggered by a failure to
> read the OV10640 chip ID:
> rdacm21 8-0054: OV10640 ID mismatch: (0x01)
>
> Fixes: a59f853b3b4b ("media: i2c: Add driver for RDACM21 camera module")
> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> ---
> drivers/media/i2c/rdacm21.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/media/i2c/rdacm21.c b/drivers/media/i2c/rdacm21.c
> index 7bce55adfd7c..50a9b0d8255d 100644
> --- a/drivers/media/i2c/rdacm21.c
> +++ b/drivers/media/i2c/rdacm21.c
> @@ -333,13 +333,15 @@ static int ov10640_initialize(struct rdacm21_device *dev)
> {
> u8 val;
>
> - /* Power-up OV10640 by setting RESETB and PWDNB pins high. */
> + /* Power-up OV10640 by setting PWDNB and RESETB pins high. */
> ov490_write_reg(dev, OV490_GPIO_SEL0, OV490_GPIO0);
> ov490_write_reg(dev, OV490_GPIO_SEL1, OV490_SPWDN0);
> ov490_write_reg(dev, OV490_GPIO_DIRECTION0, OV490_GPIO0);
> ov490_write_reg(dev, OV490_GPIO_DIRECTION1, OV490_SPWDN0);
> +
> + ov490_write_reg(dev, OV490_GPIO_OUTPUT_VALUE1, OV490_SPWDN0);
> + usleep_range(1500, 3000);
> ov490_write_reg(dev, OV490_GPIO_OUTPUT_VALUE0, OV490_GPIO0);
> - ov490_write_reg(dev, OV490_GPIO_OUTPUT_VALUE0, OV490_SPWDN0);
> usleep_range(3000, 5000);
>
> /* Read OV10640 ID to test communications. */
--
Regards,
Laurent Pinchart
next prev parent reply other threads:[~2021-03-15 21:47 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-15 13:14 [PATCH v2 00/18] media: gmsl: Reliability improvement Jacopo Mondi
2021-03-15 13:14 ` [PATCH v2 01/18] media: i2c: rdamc21: Fix warning on u8 cast Jacopo Mondi
2021-03-15 15:27 ` Kieran Bingham
2021-03-15 21:35 ` Laurent Pinchart
2021-03-15 13:14 ` [PATCH v2 02/18] media: i2c: rdacm20: Enable noise immunity Jacopo Mondi
2021-03-15 21:37 ` Laurent Pinchart
2021-03-16 12:56 ` Jacopo Mondi
2021-03-16 19:24 ` Laurent Pinchart
2021-03-15 13:14 ` [PATCH v2 03/18] media: i2c: rdacm20: Embedded 'serializer' field Jacopo Mondi
2021-03-15 15:29 ` Kieran Bingham
2021-03-15 13:14 ` [PATCH v2 04/18] media: i2c: rdacm20: Replace goto with a loop Jacopo Mondi
2021-03-15 15:36 ` Kieran Bingham
2021-03-15 13:14 ` [PATCH v2 05/18] media: i2c: rdacm20: Report camera module name Jacopo Mondi
2021-03-15 13:15 ` [PATCH v2 06/18] media: i2c: max9271: Check max9271_write() return Jacopo Mondi
2021-03-15 15:46 ` Kieran Bingham
2021-03-15 21:38 ` Laurent Pinchart
2021-03-15 13:15 ` [PATCH v2 07/18] media: i2c: rdacm20: Check return values Jacopo Mondi
2021-03-15 13:15 ` [PATCH v2 08/18] media: i2c: rdacm20: Re-work ov10635 reset Jacopo Mondi
2021-03-15 13:15 ` [PATCH v2 09/18] media: i2c: max9271: Introduce wake_up() function Jacopo Mondi
2021-03-15 17:14 ` Kieran Bingham
2021-03-15 21:43 ` Laurent Pinchart
2021-03-15 13:15 ` [PATCH v2 10/18] media: i2c: max9286: Adjust parameters indent Jacopo Mondi
2021-03-15 13:15 ` [PATCH v2 11/18] media: i2c: rdacm21: Fix OV10640 powerdown Jacopo Mondi
2021-03-15 17:20 ` Kieran Bingham
2021-03-15 21:45 ` Laurent Pinchart [this message]
2021-03-15 13:15 ` [PATCH v2 12/18] media: i2c: rdacm21: Give more time to OV490 to boot Jacopo Mondi
2021-03-15 17:22 ` Kieran Bingham
2021-03-17 10:04 ` Jacopo Mondi
2021-03-19 0:29 ` Laurent Pinchart
2021-03-19 14:53 ` Jacopo Mondi
2021-03-15 21:52 ` Laurent Pinchart
2021-03-15 13:15 ` [PATCH v2 13/18] media: i2c: max9286: Rename reverse_channel_mv Jacopo Mondi
2021-03-15 13:15 ` [PATCH v2 14/18] media: i2c: max9286: Cache channel amplitude Jacopo Mondi
2021-03-15 13:15 ` [PATCH v2 15/18] media: i2c: max9286: Define high " Jacopo Mondi
2021-03-15 13:15 ` [PATCH v2 16/18] media: v4l2-subdev: De-deprecate init() subdev op Jacopo Mondi
2021-03-15 21:56 ` Laurent Pinchart
2021-03-15 13:15 ` [PATCH v2 17/18] media: gmsl: Reimplement initialization sequence Jacopo Mondi
2021-03-15 13:15 ` [PATCH v2 18/18] media: i2c: max9286: Rework comments in .bound() Jacopo Mondi
2021-03-15 17:28 ` Kieran Bingham
2021-03-15 21:57 ` Laurent Pinchart
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