Hi
Sorry for the delay first of all.
On Wed, 19 Jan 2011, Qing Xu wrote:
> Hi,
>
> (a general request: could you please configure your mailer to wrap
> Lines at somewhere around 70 characters?)
> very sorry for the un-convenience!
>
> Thanks for your description! I could verify and try your way on our
> CSI-2 driver.
> Also, our another chip's camera controller support both MIPI and
> traditional parallel(H_sync/V_sync) interface, we hope host can
> negotiate with sensor on MIPI configure, as the sensor could be
> parallel interface or MIPI interface, so I have a proposal as
> follow:
>
> in soc_camera.h, SOCAM_XXX defines all HW connection properties,
> I thing MIPI(1/2/3/4 lanes) is also a kind of HW connection
> property, and it is mutex with parallel properties(if sensor
> support mipi connection, the HW signal has no parallel property
> any more), once host controller find subdev support MIPI, it will
> enable MIPI functional itself, and if subdev only support parallel,
> it will enable parallel functional itself.
I think, yes, we can add MIPI definitions to soc_camera.h, similar to your
proposal below, but I don't think we need the "SOCAM_MIPI" macro itself,
maybe define it as a mask
#define SOCAM_MIPI (SOCAM_MIPI_1LANE | SOCAM_MIPI_2LANE | SOCAM_MIPI_3LANE |
SOCAM_MIPI_4LANE)
Also, the decision "if MIPI supported by the client always prefer it over
the parallel connection" doesn't seem to be a meaningful thing to do in
the driver to me. I would leave the choice of a connection to the platform
code. In that case your addition to the soc_camera_apply_sensor_flags()
function becomes unneeded.
Makes sense?
Thanks
Guennadi
> (you can find the proposal in the code which I have sent, refer to
> pxa955_cam_set_bus_param() in pxa955_cam.c, ov5642_query_bus_param
> In ov5642.c)
>
> --- a/drivers/media/video/soc_camera.c
> +++ b/drivers/media/video/soc_camera.c
> unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
> if (f == SOCAM_PCLK_SAMPLE_RISING || f ==
> SOCAM_PCLK_SAMPLE_FALLING)
> flags ^= SOCAM_PCLK_SAMPLE_RISING |
> SOCAM_PCLK_SAMPLE_FALLING;
> }
> + if (icl->flags & SOCAM_MIPI) {
> + flags &= SOCAM_MIPI | SOCAM_MIPI_1LANE | SOCAM_MIPI_2LANE
> + | SOCAM_MIPI_3LANE | SOCAM_MIPI_4LANE;
> + }
>
> return flags;
> }
>
> --- a/include/media/soc_camera.h
> +++ b/include/media/soc_camera.h
>
> #define SOCAM_DATA_ACTIVE_HIGH (1 << 14)
> #define SOCAM_DATA_ACTIVE_LOW (1 << 15)
>
> +#define SOCAM_MIPI (1 << 16)
> +#define SOCAM_MIPI_1LANE (1 << 17)
> +#define SOCAM_MIPI_2LANE (1 << 18)
> +#define SOCAM_MIPI_3LANE (1 << 19)
> +#define SOCAM_MIPI_4LANE (1 << 20)
> +
>
> static inline unsigned long soc_camera_bus_param_compatible(
> unsigned long camera_flags, unsigned long bus_flags)
> {
> - unsigned long common_flags, hsync, vsync, pclk, data, buswidth, mode;
> + unsigned long common_flags, hsync, vsync, pclk, data, buswidth, mode,
> mipi;
>
> common_flags = camera_flags & bus_flags;
>
> @@ -261,8 +267,10 @@ static inline unsigned long
> soc_camera_bus_param_compatible(
> data = common_flags & (SOCAM_DATA_ACTIVE_HIGH |
> SOCAM_DATA_ACTIVE_LOW);
> mode = common_flags & (SOCAM_MASTER | SOCAM_SLAVE);
> buswidth = common_flags & SOCAM_DATAWIDTH_MASK;
> + mipi = common_flags & (SOCAM_MIPI | SOCAM_MIPI_1LANE |
> SOCAM_MIPI_2LANE
> + | SOCAM_MIPI_3LANE |
> SOCAM_MIPI_4LANE);
>
> - return (!hsync || !vsync || !pclk || !data || !mode || !buswidth) ? 0
> :
> + return ((!hsync || !vsync || !pclk || !data || !mode || !buswidth) &&
> (!mipi)) ? 0 :
> common_flags;
> }
>
>
> -----Original Message-----
> From: Guennadi Liakhovetski [mailto:[email protected]]
> Sent: 2011Äê1ÔÂ20ÈÕ 0:20
> To: Qing Xu
> Cc: Laurent Pinchart; Linux Media Mailing List
> Subject: Re: How to support MIPI CSI-2 controller in soc-camera framework?
>
> (a general request: could you please configure your mailer to wrap lines
> at somewhere around 70 characters?)
>
> On Tue, 18 Jan 2011, Qing Xu wrote:
>
> > Hi,
> >
> > Our chip support both MIPI and parallel interface. The HW connection logic
> > is
> > sensor(such as ov5642) -> our MIPI controller(handle DPHY timing/ CSI-2
> > things) -> our camera controller (handle DMA transmitting/ fmt/ size
> > things). Now, I find the driver of sh_mobile_csi2.c, it seems like a
> > CSI-2 driver, but I don't quite understand how it works:
> > 1) how the host controller call into this driver?
>
> This is a normal v4l2-subdev driver. Platform data for the
> sh_mobile_ceu_camera driver provides a link to CSI2 driver data, then the
> host driver loads the CSI2 driver, which then links itself into the
> subdevice list. Look at arch/arm/mach-shmobile/board-ap4evb.c how the data
> is linked:
>
> static struct sh_mobile_ceu_info sh_mobile_ceu_info = {
> .flags = SH_CEU_FLAG_USE_8BIT_BUS,
> .csi2_dev = &csi2_device.dev,
> };
>
> and in the hosz driver drivers/media/video/sh_mobile_ceu_camera.c look in
> the sh_mobile_ceu_probe function below the lines:
>
> csi2 = pcdev->pdata->csi2_dev;
> if (csi2) {
> ...
>
>
> > 2) how the host controller/sensor negotiate MIPI variable with this
> > driver, such as D-PHY timing(hs_settle/hs_termen/clk_settle/clk_termen),
> > number of lanes...?
>
> Since I only had a limited number of MIPI setups, I haven't implemented
> maximum flexibility. A part of the parameters is hard-coded, another part
> is provided in the platform driver, yet another part is calculated
> dynamically.
>
> Thanks
> Guennadi
> ---
> Guennadi Liakhovetski, Ph.D.
> Freelance Open-Source Software Developer
> http://www.open-technology.de/
>
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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