[RESEND PATCH] Add pixel clock support to OV5640 camera sensor

[RESEND PATCH] Add pixel clock support to OV5640 camera sensor

[Manivannan Sadhasivam]

Some of the camera subsystems like camss in Qualcommm MSM chipsets
require pixel clock support in camera sensor drivers for proper functioning.
So, add a default pixel clock rate of 96MHz to OV5640 camera sensor driver.

According to the datasheet, 96MHz can be used as a pixel clock rate for
most of the modes.

This patch has been validated on Dragonboard410c with OV5640 connected
using D3 Camera Mezzanine.

Manivannan Sadhasivam (1):
  media: i2c: ov5640: Add pixel clock support

 drivers/media/i2c/ov5640.c | 4 ++++
 1 file changed, 4 insertions(+)

-- 
2.7.4

[RESEND PATCH] media: i2c: ov5640: Add pixel clock support

[Manivannan Sadhasivam]

Some of the camera subsystems like camss in Qualcommm MSM chipsets
require pixel clock support in camera sensor drivers. So, this commit
adds a default pixel clock rate of 96MHz to OV5640 camera sensor driver.

According to the datasheet, 96MHz can be used as a pixel clock rate for
most of the modes.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/media/i2c/ov5640.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c
index 39a2269..7152c84 100644
--- a/drivers/media/i2c/ov5640.c
+++ b/drivers/media/i2c/ov5640.c
@@ -162,6 +162,7 @@ struct ov5640_ctrls {
 		struct v4l2_ctrl *auto_gain;
 		struct v4l2_ctrl *gain;
 	};
+	struct v4l2_ctrl *pixel_clock;
 	struct v4l2_ctrl *brightness;
 	struct v4l2_ctrl *saturation;
 	struct v4l2_ctrl *contrast;
@@ -2009,6 +2010,9 @@ static int ov5640_init_controls(struct ov5640_dev *sensor)
 	ctrls->gain = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_GAIN,
 					0, 1023, 1, 0);
 
+	/* Pixel clock (default of 96MHz) */
+	ctrls->pixel_clock = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_PIXEL_RATE,
+					1, INT_MAX, 1, 96000000);
 	ctrls->saturation = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_SATURATION,
 					      0, 255, 1, 64);
 	ctrls->hue = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_HUE,
-- 
2.7.4

Re: [RESEND PATCH] media: i2c: ov5640: Add pixel clock support

[Loic Poulain]

On 29 March 2018 at 16:55, Manivannan Sadhasivam
<manivannan.sadhasivam@linaro.org> wrote:
> Some of the camera subsystems like camss in Qualcommm MSM chipsets
> require pixel clock support in camera sensor drivers. So, this commit
> adds a default pixel clock rate of 96MHz to OV5640 camera sensor driver.
>
> According to the datasheet, 96MHz can be used as a pixel clock rate for
> most of the modes.
>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

Tested-by: Loic Poulain <loic.poulain@linaro.org>

It works for me on Dragonboard 410c + D3 camera mezzanine (ov5640) .

Any comments on this change?

Regards,
Loic

Re: [RESEND PATCH] media: i2c: ov5640: Add pixel clock support

[Sakari Ailus]

On Tue, Apr 24, 2018 at 11:01:18AM +0200, Loic Poulain wrote:
> On 29 March 2018 at 16:55, Manivannan Sadhasivam
> <manivannan.sadhasivam@linaro.org> wrote:
> > Some of the camera subsystems like camss in Qualcommm MSM chipsets
> > require pixel clock support in camera sensor drivers. So, this commit
> > adds a default pixel clock rate of 96MHz to OV5640 camera sensor driver.
> >
> > According to the datasheet, 96MHz can be used as a pixel clock rate for
> > most of the modes.
> >
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> 
> Tested-by: Loic Poulain <loic.poulain@linaro.org>
> 
> It works for me on Dragonboard 410c + D3 camera mezzanine (ov5640) .
> 
> Any comments on this change?

<URL:https://patchwork.linuxtv.org/project/linux-media/list/?submitter=Maxime+Ripard&state=*&q=ov5640>

There's also another set that adds PIXEL_CLOCK (as well as LINK_FREQ)
support to the driver, that seems more complete than this patch but
requires a rebase on Maxime's patches:

<URL:https://patchwork.linuxtv.org/project/linux-media/list/?submitter=7218&state=*&q=ov5640>

-- 
Sakari Ailus
e-mail: sakari.ailus@iki.fi

Re: [RESEND PATCH] media: i2c: ov5640: Add pixel clock support

[Loic Poulain]

Hi Sakari,

>> Any comments on this change?
>
> <URL:https://patchwork.linuxtv.org/project/linux-media/list/?submitter=Maxime+Ripard&state=*&q=ov5640>
>
> There's also another set that adds PIXEL_CLOCK (as well as LINK_FREQ)
> support to the driver, that seems more complete than this patch but
> requires a rebase on Maxime's patches:
>
> <URL:https://patchwork.linuxtv.org/project/linux-media/list/?submitter=7218&state=*&q=ov5640>

Thanks, I've just see this patch series. Indeed, patch will need a
rework/rebase.

Regards,
Loic