Re: [PATCH v2 1/3] media: i2c: imx471: Add line length PCK setting

[Sakari Ailus <sakari.ailus@iki.fi>]

On Fri, Sep 04, 2026 at 11:18:16AM +0300, Sakari Ailus wrote:
> Hi Kate,
> 
> On Fri, Sep 04, 2026 at 03:51:11PM +0800, Kate Hsuan wrote:
> > Add the line length PCK setting to the IMX471 driver. This parameter
> > determines the horizontal line scan duration and is used to calculate
> > and control the sensor frame rate.
> > Set the line length PCK value to 0x0a00 (matching the original value
> > in ipu6-drivers), which maintains a frame rate close to the datasheet
> > spec (~150 FPS in 2328x1304 binning mode).
> 
> This fits on fewer lines, please rewrap.
> 
> > 
> > Signed-off-by: Kate Hsuan <hpa@redhat.com>
> > ---
> >  drivers/media/i2c/imx471.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/media/i2c/imx471.c b/drivers/media/i2c/imx471.c
> > index 4053aed84340..3c939f2a9056 100644
> > --- a/drivers/media/i2c/imx471.c
> > +++ b/drivers/media/i2c/imx471.c
> > @@ -91,6 +91,7 @@
> >  #define IMX471_CSI_2_LANE_MODE			1
> >  #define IMX471_CSI_4_LANE_MODE			3
> >  
> > +#define IMX471_REG_LINE_LENGTH_PCK		CCI_REG16(0x0342)
> >  #define IMX471_REG_X_ADD_STA			CCI_REG16(0x0344)
> >  #define IMX471_REG_Y_ADD_STA			CCI_REG16(0x0346)
> >  #define IMX471_REG_X_ADD_END			CCI_REG16(0x0348)
> > @@ -240,6 +241,7 @@ static const struct cci_reg_sequence mode_1928x1088_regs[] = {
> >  	{ CCI_REG8(0x030d), 0x02 },
> >  	{ CCI_REG8(0x030e), 0x00 },
> >  	{ CCI_REG8(0x030f), 0x53 },
> > +	{ IMX471_REG_LINE_LENGTH_PCK, 2560 },
> 
> The register definition is nice but there's already a control for this.
> Could you do this via s_ctrl()?
> 
> There's also another set addressing related issues here
> <URL:https://lore.kernel.org/linux-media/20260904075113.125751-1-hpa@redhat.com/T/#t>.

Wrong URL, I meant this one
<URL:https://patchwork.linuxtv.org/project/linux-media/patch/ede568ada4304d2dc92cd43986fc07aa68628154.1788377269.git.christian@themurphys.eu/>.

-- 
Sakari Ailus