Re: [PATCH v3 21/25] drivers: media: i2c: imx258: Use macros

Tommaso Merciai
2024-04-05T14:11:28Z

Hi Luis,

On Fri, Apr 05, 2024 at 04:33:38AM -0600, Luis Garcia wrote:
> On 4/4/24 00:46, Sakari Ailus wrote:
> > On Wed, Apr 03, 2024 at 01:17:26PM -0600, Luigi311 wrote:
> >> On 4/3/24 10:23, Sakari Ailus wrote:
> >>> Hi Luis,
> >>>
> >>> On Wed, Apr 03, 2024 at 09:03:50AM -0600, git@luigi311.com wrote:
> >>>> From: Luis Garcia <git@luigi311.com>
> >>>>
> >>>> Use understandable macros instead of raw values.
> >>>>
> >>>> Signed-off-by: Ondrej Jirman <megi@xff.cz>
> >>>> Signed-off-by: Luis Garcia <git@luigi311.com>
> >>>> ---
> >>>> drivers/media/i2c/imx258.c | 434 ++++++++++++++++++-------------------
> >>>> 1 file changed, 207 insertions(+), 227 deletions(-)
> >>>>
> >>>> diff --git a/drivers/media/i2c/imx258.c b/drivers/media/i2c/imx258.c
> >>>> index e2ecf6109516..30352c33f63c 100644
> >>>> --- a/drivers/media/i2c/imx258.c
> >>>> +++ b/drivers/media/i2c/imx258.c
> >>>> @@ -33,8 +33,6 @@
> >>>> #define IMX258_VTS_30FPS_VGA 0x034c
> >>>> #define IMX258_VTS_MAX 65525
> >>>>
> >>>> -#define IMX258_REG_VTS 0x0340
> >>>> -
> >>>> /* HBLANK control - read only */
> >>>> #define IMX258_PPL_DEFAULT 5352
> >>>>
> >>>> @@ -90,6 +88,53 @@
> >>>> #define IMX258_PIXEL_ARRAY_WIDTH 4208U
> >>>> #define IMX258_PIXEL_ARRAY_HEIGHT 3120U
> >>>>
> >>>> +/* regs */
> >>>> +#define IMX258_REG_PLL_MULT_DRIV 0x0310
> >>>> +#define IMX258_REG_IVTPXCK_DIV 0x0301
> >>>> +#define IMX258_REG_IVTSYCK_DIV 0x0303
> >>>> +#define IMX258_REG_PREPLLCK_VT_DIV 0x0305
> >>>> +#define IMX258_REG_IOPPXCK_DIV 0x0309
> >>>> +#define IMX258_REG_IOPSYCK_DIV 0x030b
> >>>> +#define IMX258_REG_PREPLLCK_OP_DIV 0x030d
> >>>> +#define IMX258_REG_PHASE_PIX_OUTEN 0x3030
> >>>> +#define IMX258_REG_PDPIX_DATA_RATE 0x3032
> >>>> +#define IMX258_REG_SCALE_MODE 0x0401
> >>>> +#define IMX258_REG_SCALE_MODE_EXT 0x3038
> >>>> +#define IMX258_REG_AF_WINDOW_MODE 0x7bcd
> >>>> +#define IMX258_REG_FRM_LENGTH_CTL 0x0350
> >>>> +#define IMX258_REG_CSI_LANE_MODE 0x0114
> >>>> +#define IMX258_REG_X_EVN_INC 0x0381
> >>>> +#define IMX258_REG_X_ODD_INC 0x0383
> >>>> +#define IMX258_REG_Y_EVN_INC 0x0385
> >>>> +#define IMX258_REG_Y_ODD_INC 0x0387
> >>>> +#define IMX258_REG_BINNING_MODE 0x0900
> >>>> +#define IMX258_REG_BINNING_TYPE_V 0x0901
> >>>> +#define IMX258_REG_FORCE_FD_SUM 0x300d
> >>>> +#define IMX258_REG_DIG_CROP_X_OFFSET 0x0408
> >>>> +#define IMX258_REG_DIG_CROP_Y_OFFSET 0x040a
> >>>> +#define IMX258_REG_DIG_CROP_IMAGE_WIDTH 0x040c
> >>>> +#define IMX258_REG_DIG_CROP_IMAGE_HEIGHT 0x040e
> >>>> +#define IMX258_REG_SCALE_M 0x0404
> >>>> +#define IMX258_REG_X_OUT_SIZE 0x034c
> >>>> +#define IMX258_REG_Y_OUT_SIZE 0x034e
> >>>> +#define IMX258_REG_X_ADD_STA 0x0344
> >>>> +#define IMX258_REG_Y_ADD_STA 0x0346
> >>>> +#define IMX258_REG_X_ADD_END 0x0348
> >>>> +#define IMX258_REG_Y_ADD_END 0x034a
> >>>> +#define IMX258_REG_EXCK_FREQ 0x0136
> >>>> +#define IMX258_REG_CSI_DT_FMT 0x0112
> >>>> +#define IMX258_REG_LINE_LENGTH_PCK 0x0342
> >>>> +#define IMX258_REG_SCALE_M_EXT 0x303a
> >>>> +#define IMX258_REG_FRM_LENGTH_LINES 0x0340
> >>>> +#define IMX258_REG_FINE_INTEG_TIME 0x0200
> >>>> +#define IMX258_REG_PLL_IVT_MPY 0x0306
> >>>> +#define IMX258_REG_PLL_IOP_MPY 0x030e
> >>>> +#define IMX258_REG_REQ_LINK_BIT_RATE_MBPS_H 0x0820
> >>>> +#define IMX258_REG_REQ_LINK_BIT_RATE_MBPS_L 0x0822
> >>>> +
> >>>> +#define REG8(a, v) { a, v }
> >>>> +#define REG16(a, v) { a, ((v) >> 8) & 0xff }, { (a) + 1, (v) & 0xff }
> >>>
> >>> The patch is nice but these macros are better replaced by the V4L2 CCI
> >>> helper that also offers register access functions. Could you add a patch to
> >>> convert the driver to use it (maybe after this one)?
> >>>
> >>
> >> Ohh perfect, using something else would be great. Ill go ahead and see
> >> if I can get that working.
> >
> > Thanks. It may be easier to just do it in this one actually. Up to you.
> >
>
> I've made the swap but looks like its not playing nice with my ppp,
> its causing a crash and showing a call trace as soon as it does its
> first read to check the identity. I went in and dropped the cci_read
> and left it with the original implementation and I'm getting a very
> similar crash with cci_write too so it looks like its not liking
> how I'm implementing it. Looking at the few other drivers that were
> swapped over to use that, I don't seem to be missing anything. It's
> a big change so its not really something I can describe what I've
> changed but I do have the change on my github here
> https://github.com/luigi311/linux/commit/840593acb20eee87ce361e6929edf51eefbbe737

I checked your commit to switch to cci helper.
I think you are missing the right cci regmap initialization.

Please take care to use: devm_cci_regmap_init_i2c

/**
* devm_cci_regmap_init_i2c() - Create regmap to use with cci_*() register
* access functions
*
* @client: i2c_client to create the regmap for
* @reg_addr_bits: register address width to use (8 or 16)
*
* Note the memory for the created regmap is devm() managed, tied to the client.
*
* Return: %0 on success or a negative error code on failure.
*/

Check drivers/media/i2c/imx290.c:1530
Hope this help :)

Note:
Somewhere into the github commit you are reading 16bit reg and storing
that into 64bit val. Take care! :)

Thanks & Regards,
Tommaso

> if you can provide some guidance, if not I can skip this change
> all together and we can do a separate attempt at swapping over to it.
>