> -----Original Message-----
> From: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
> Sent: Thursday, February 20, 2025 6:50 PM
> To: shravan Chippa - I35088 <Shravan.Chippa@xxxxxxxxxxxxx>
> Cc: mchehab@xxxxxxxxxx; kieran.bingham@xxxxxxxxxxxxxxxx; linux-
> media@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Conor Dooley -
> M52691 <Conor.Dooley@xxxxxxxxxxxxx>; Valentina Fernandez Alanis -
> M63239 <Valentina.FernandezAlanis@xxxxxxxxxxxxx>; Praveen Kumar -
> I30718 <Praveen.Kumar@xxxxxxxxxxxxx>
> Subject: Re: [PATCH V4] media: i2c: imx334: Add support for 1280x720 &
> 640x480 resolutions
>
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the
> content is safe
>
> Hi Shravan,
>
> On Tue, Feb 18, 2025 at 03:03:56PM +0530, shravan kumar wrote:
> > From: Shravan Chippa <shravan.chippa@xxxxxxxxxxxxx>
> >
> > Added support for 1280x720@30 and 640x480@30 resolutions and
> optimized
> > the resolution arrays by incorporating a common register array.
> >
> > Updated the register array values for 1920x1080@30 and 3840x2160@30
> > resolutions in accordance with the common register array values.
> >
> > Signed-off-by: Shravan Chippa <shravan.chippa@xxxxxxxxxxxxx>
> >
> > ---
> > changelog:
> > v3 -> v4
> > In response to the review request, the dependency of the common
> > register value array on the 445M link frequency has been eliminated.
> >
> > Although I do not have a test setup for 4k resolution at an 819M link
> > frequency, I have made adjustments based on the IMX334 data sheet, the
> > latest 4k resolution, and the common register value array.
> >
> > Additionally, the 4k resolution has been switched to master mode to
> > ensure consistency with other resolutions that also use master mode.
> >
> > changelog:
> > v2 -> v3
> > removied blank lines reported by media CI robot
> >
> > v1 -> v2
> > Optimized the resolution arrays by added common register array
> > ---
> >
> > drivers/media/i2c/imx334.c | 214
> > +++++++++++++++++++------------------
> > 1 file changed, 109 insertions(+), 105 deletions(-)
> >
> > diff --git a/drivers/media/i2c/imx334.c b/drivers/media/i2c/imx334.c
> > index a544fc3df39c..0172406780df 100644
> > --- a/drivers/media/i2c/imx334.c
> > +++ b/drivers/media/i2c/imx334.c
> > @@ -167,8 +167,8 @@ static const s64 link_freq[] = {
> > IMX334_LINK_FREQ_445M,
> > };
> >
> > -/* Sensor mode registers for 1920x1080@30fps */ -static const struct
> > imx334_reg mode_1920x1080_regs[] = {
> > +/* Sensor common mode registers values */ static const struct
> > +imx334_reg common_mode_regs[] = {
> > {0x3000, 0x01},
> > {0x3018, 0x04},
> > {0x3030, 0xca},
> > @@ -176,26 +176,10 @@ static const struct imx334_reg
> mode_1920x1080_regs[] = {
> > {0x3032, 0x00},
> > {0x3034, 0x4c},
> > {0x3035, 0x04},
> > - {0x302c, 0xf0},
> > - {0x302d, 0x03},
> > - {0x302e, 0x80},
> > - {0x302f, 0x07},
> > - {0x3074, 0xcc},
> > - {0x3075, 0x02},
> > - {0x308e, 0xcd},
> > - {0x308f, 0x02},
> > - {0x3076, 0x38},
> > - {0x3077, 0x04},
> > - {0x3090, 0x38},
> > - {0x3091, 0x04},
> > - {0x3308, 0x38},
> > - {0x3309, 0x04},
> > - {0x30C6, 0x00},
> > + {0x30c6, 0x00},
> > {0x30c7, 0x00},
> > {0x30ce, 0x00},
> > {0x30cf, 0x00},
> > - {0x30d8, 0x18},
> > - {0x30d9, 0x0a},
> > {0x304c, 0x00},
> > {0x304e, 0x00},
> > {0x304f, 0x00},
> > @@ -210,7 +194,7 @@ static const struct imx334_reg
> mode_1920x1080_regs[] = {
> > {0x300d, 0x29},
> > {0x314c, 0x29},
> > {0x314d, 0x01},
> > - {0x315a, 0x06},
> > + {0x315a, 0x0a},
>
> What's the effect of this change and why is it done?
This change is to increase the horizontal blanking to get more time to process the image line by line.
>
> > {0x3168, 0xa0},
> > {0x316a, 0x7e},
> > {0x319e, 0x02},
> > @@ -330,116 +314,103 @@ static const struct imx334_reg
> mode_1920x1080_regs[] = {
> > {0x3002, 0x00},
> > };
> >
> > +/* Sensor mode registers for 640x480@30fps */ static const struct
> > +imx334_reg mode_640x480_regs[] = {
> > + {0x302c, 0x70},
> > + {0x302d, 0x06},
> > + {0x302e, 0x80},
> > + {0x302f, 0x02},
> > + {0x3074, 0x48},
> > + {0x3075, 0x07},
> > + {0x308e, 0x49},
> > + {0x308f, 0x07},
> > + {0x3076, 0xe0},
> > + {0x3077, 0x01},
> > + {0x3090, 0xe0},
> > + {0x3091, 0x01},
> > + {0x3308, 0xe0},
> > + {0x3309, 0x01},
> > + {0x30d8, 0x30},
> > + {0x30d9, 0x0b},
> > +};
> > +
> > +/* Sensor mode registers for 1280x720@30fps */ static const struct
> > +imx334_reg mode_1280x720_regs[] = {
> > + {0x302c, 0x30},
> > + {0x302d, 0x05},
> > + {0x302e, 0x00},
> > + {0x302f, 0x05},
> > + {0x3074, 0x84},
> > + {0x3075, 0x03},
> > + {0x308e, 0x85},
> > + {0x308f, 0x03},
> > + {0x3076, 0xd0},
> > + {0x3077, 0x02},
> > + {0x3090, 0xd0},
> > + {0x3091, 0x02},
> > + {0x3308, 0xd0},
> > + {0x3309, 0x02},
> > + {0x30d8, 0x30},
> > + {0x30d9, 0x0b},
> > +};
> > +
> > +/* Sensor mode registers for 1920x1080@30fps */ static const struct
> > +imx334_reg mode_1920x1080_regs[] = {
> > + {0x302c, 0xf0},
> > + {0x302d, 0x03},
> > + {0x302e, 0x80},
> > + {0x302f, 0x07},
> > + {0x3074, 0xcc},
> > + {0x3075, 0x02},
> > + {0x308e, 0xcd},
> > + {0x308f, 0x02},
> > + {0x3076, 0x38},
> > + {0x3077, 0x04},
> > + {0x3090, 0x38},
> > + {0x3091, 0x04},
> > + {0x3308, 0x38},
> > + {0x3309, 0x04},
> > + {0x30d8, 0x18},
> > + {0x30d9, 0x0a},
> > +};
> > +
> > /* Sensor mode registers for 3840x2160@30fps */ static const struct
> > imx334_reg mode_3840x2160_regs[] = {
> > - {0x3000, 0x01},
> > - {0x3002, 0x00},
> > - {0x3018, 0x04},
> > - {0x37b0, 0x36},
> > - {0x304c, 0x00},
> > - {0x300c, 0x3b},
>
> This was the only location this register was written to.
This register value is same for all link frequencies (default value 0x3b for 24Mhz crystal clock),
>
> Please split this into two to make it more reviewable: splitting register lists
> into two and then to adding new modes.
I will try to make one patch for common register values
One more patch for new modes of 640x480 and 1280x720
Thanks,
Shravan
>
> > - {0x300d, 0x2a},
> > - {0x3034, 0x26},
> > - {0x3035, 0x02},
> > - {0x314c, 0x29},
> > - {0x314d, 0x01},
> > - {0x315a, 0x02},
> > - {0x3168, 0xa0},
> > - {0x316a, 0x7e},
> > - {0x3288, 0x21},
> > - {0x328a, 0x02},
> > {0x302c, 0x3c},
> > {0x302d, 0x00},
> > {0x302e, 0x00},
> > {0x302f, 0x0f},
> > + {0x3074, 0xb0},
> > + {0x3075, 0x00},
> > + {0x308e, 0xb1},
> > + {0x308f, 0x00},
> > {0x3076, 0x70},
> > {0x3077, 0x08},
> > {0x3090, 0x70},
> > {0x3091, 0x08},
> > - {0x30d8, 0x20},
> > - {0x30d9, 0x12},
> > {0x3308, 0x70},
> > {0x3309, 0x08},
> > - {0x3414, 0x05},
> > - {0x3416, 0x18},
> > - {0x35ac, 0x0e},
> > - {0x3648, 0x01},
> > - {0x364a, 0x04},
> > - {0x364c, 0x04},
> > - {0x3678, 0x01},
> > - {0x367c, 0x31},
> > - {0x367e, 0x31},
> > - {0x3708, 0x02},
> > - {0x3714, 0x01},
> > - {0x3715, 0x02},
> > - {0x3716, 0x02},
> > - {0x3717, 0x02},
> > - {0x371c, 0x3d},
> > - {0x371d, 0x3f},
> > - {0x372c, 0x00},
> > - {0x372d, 0x00},
> > - {0x372e, 0x46},
> > - {0x372f, 0x00},
> > - {0x3730, 0x89},
> > - {0x3731, 0x00},
> > - {0x3732, 0x08},
> > - {0x3733, 0x01},
> > - {0x3734, 0xfe},
> > - {0x3735, 0x05},
> > - {0x375d, 0x00},
> > - {0x375e, 0x00},
> > - {0x375f, 0x61},
> > - {0x3760, 0x06},
> > - {0x3768, 0x1b},
> > - {0x3769, 0x1b},
> > - {0x376a, 0x1a},
> > - {0x376b, 0x19},
> > - {0x376c, 0x18},
> > - {0x376d, 0x14},
> > - {0x376e, 0x0f},
> > - {0x3776, 0x00},
> > - {0x3777, 0x00},
> > - {0x3778, 0x46},
> > - {0x3779, 0x00},
> > - {0x377a, 0x08},
> > - {0x377b, 0x01},
> > - {0x377c, 0x45},
> > - {0x377d, 0x01},
> > - {0x377e, 0x23},
> > - {0x377f, 0x02},
> > - {0x3780, 0xd9},
> > - {0x3781, 0x03},
> > - {0x3782, 0xf5},
> > - {0x3783, 0x06},
> > - {0x3784, 0xa5},
> > - {0x3788, 0x0f},
> > - {0x378a, 0xd9},
> > - {0x378b, 0x03},
> > - {0x378c, 0xeb},
> > - {0x378d, 0x05},
> > - {0x378e, 0x87},
> > - {0x378f, 0x06},
> > - {0x3790, 0xf5},
> > - {0x3792, 0x43},
> > - {0x3794, 0x7a},
> > - {0x3796, 0xa1},
> > - {0x3e04, 0x0e},
> > + {0x30d8, 0x20},
> > + {0x30d9, 0x12},
> > {0x319e, 0x00},
> > {0x3a00, 0x01},
> > {0x3a18, 0xbf},
> > - {0x3a19, 0x00},
> > {0x3a1a, 0x67},
> > - {0x3a1b, 0x00},
> > {0x3a1c, 0x6f},
> > - {0x3a1d, 0x00},
> > {0x3a1e, 0xd7},
> > {0x3a1f, 0x01},
> > + {0x300d, 0x2a},
> > + {0x3034, 0x26},
> > + {0x3035, 0x02},
> > + {0x315a, 0x02},
> > {0x3a20, 0x6f},
> > {0x3a21, 0x00},
> > {0x3a22, 0xcf},
> > {0x3a23, 0x00},
> > {0x3a24, 0x6f},
> > {0x3a25, 0x00},
> > + {0x3a24, 0x6f},
> > + {0x3a25, 0x00},
> > {0x3a26, 0xb7},
> > {0x3a27, 0x00},
> > {0x3a28, 0x5f},
> > @@ -505,6 +476,32 @@ static const struct imx334_mode
> supported_modes[] = {
> > .num_of_regs = ARRAY_SIZE(mode_1920x1080_regs),
> > .regs = mode_1920x1080_regs,
> > },
> > + }, {
> > + .width = 1280,
> > + .height = 720,
> > + .hblank = 2480,
> > + .vblank = 1170,
> > + .vblank_min = 45,
> > + .vblank_max = 132840,
> > + .pclk = 297000000,
> > + .link_freq_idx = 1,
> > + .reg_list = {
> > + .num_of_regs = ARRAY_SIZE(mode_1280x720_regs),
> > + .regs = mode_1280x720_regs,
> > + },
> > + }, {
> > + .width = 640,
> > + .height = 480,
> > + .hblank = 2480,
> > + .vblank = 1170,
> > + .vblank_min = 45,
> > + .vblank_max = 132840,
> > + .pclk = 297000000,
> > + .link_freq_idx = 1,
> > + .reg_list = {
> > + .num_of_regs = ARRAY_SIZE(mode_640x480_regs),
> > + .regs = mode_640x480_regs,
> > + },
> > },
> > };
> >
> > @@ -989,6 +986,13 @@ static int imx334_start_streaming(struct imx334
> *imx334)
> > const struct imx334_reg_list *reg_list;
> > int ret;
> >
> > + ret = imx334_write_regs(imx334, common_mode_regs,
> > + ARRAY_SIZE(common_mode_regs));
> > + if (ret) {
> > + dev_err(imx334->dev, "fail to write common registers");
> > + return ret;
> > + }
> > +
> > /* Write sensor mode registers */
> > reg_list = &imx334->cur_mode->reg_list;
> > ret = imx334_write_regs(imx334, reg_list->regs,
>
> --
> Kind regards,
>
> Sakari Ailus
