Hi Julien,
Thank you for taking some time to review this series and sorry for the
late reply... :/ I have been involved in other more pressing stuff
lately...
On Tue, Feb 18, 2025 at 02:14:57PM +0100, Julien Massot wrote:
> Hi Laurentiu,
>
> Thanks for your patch,
> On Fri, 2025-02-07 at 13:29 +0200, Laurentiu Palcu wrote:
> > The Programming Notes section of the specifications states:
> >
> > """
> > MANDATORY REGISTER PROGRAMMING
> > Make the following register writes to ensure proper operation of the
> > MAX96717F. Without these writes, the operation of the device specified
> > in the data sheet cannot be guaranteed.
> > Set bits [6:4] = 3'b001 in register 0x302
> > """
> >
> > Set this register before going on with the chip initialization.
> >
> > Signed-off-by: Laurentiu Palcu <laurentiu.palcu@xxxxxxxxxxx>
> > ---
> > drivers/media/i2c/max96717.c | 17 +++++++++++++++++
> > 1 file changed, 17 insertions(+)
> >
> > diff --git a/drivers/media/i2c/max96717.c b/drivers/media/i2c/max96717.c
> > index 9259d58ba734e..b1116aade0687 100644
> > --- a/drivers/media/i2c/max96717.c
> > +++ b/drivers/media/i2c/max96717.c
> > @@ -78,6 +78,15 @@
> > #define MAX96717_GPIO_TX_EN BIT(1)
> > #define MAX96717_GPIO_OUT_DIS BIT(0)
> >
> > +/* CMU */
> > +#define MAX96717_CMU_CMU2 CCI_REG8(0x0302)
> > +#define MAX96717_PFDDIV_RSHORT_MASK GENMASK(6, 4)
> > +#define MAX96717_PFDDIV_RSHORT_SHIFT 4
> > +#define MAX96717_PFDDIV_VREG_1V0 0
> > +#define MAX96717_PFDDIV_VREG_1V1 1
> > +#define MAX96717_PFDDIV_VREG_0V875 2
> > +#define MAX96717_PFDDIV_VREG_0V94 3
> > +
> > /* FRONTTOP */
> > /* MAX96717 only have CSI port 'B' */
> > #define MAX96717_FRONTOP0 CCI_REG8(0x308)
> > @@ -981,6 +990,14 @@ static int max96717_hw_init(struct max96717_priv *priv)
> > dev_dbg(dev, "Found %x (rev %lx)\n", (u8)dev_id,
> > (u8)val & MAX96717_DEV_REV_MASK);
> >
> > + /*
> > + * According to specs, in the Programming Notes section, there's a mandatory register
> > + * programming notice that advises to enable the 1.1V internal regulator to guarantee
> > proper
> > + * device operation. Let's do this before any other operations.
> > + */
> Latest MAX96717{,K,F} revision 6 seems not affected by this issue. Can you please make this write
> conditional to rev < 6 ? Register 0xe.
Ok, makes sense.
Thanks,
Laurentiu
>
> > + cci_write(priv->regmap, MAX96717_CMU_CMU2,
> > + MAX96717_PFDDIV_VREG_1V1 << MAX96717_PFDDIV_RSHORT_SHIFT, NULL);
> > +
> > ret = cci_read(priv->regmap, MAX96717_MIPI_RX_EXT11, &val, NULL);
> > if (ret)
> > return dev_err_probe(dev, ret,
> Regards,
> --
> Julien
