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Message-ID: <CA+V-a8u0dLJGP_1MXQYu2v6o55vBSxH49S3HRY=9gb2dcO8PnA@mail.gmail.com>
Date: Fri, 31 Jul 2020 14:18:12 +0100
From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To: Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
Jacopo Mondi <jacopo@...ndi.org>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Steve Longerbeam <slongerbeam@...il.com>,
linux-media <linux-media@...r.kernel.org>,
Hugues Fruchet <hugues.fruchet@...com>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH 1/2] media: i2c: ov5640: Enable data pins on startup for
DVP mode
Hi Sakari,
Thank you for the review.
On Fri, Jul 31, 2020 at 2:03 PM Sakari Ailus
<sakari.ailus@...ux.intel.com> wrote:
>
> Hi Prabhakar,
>
> Thank you for the patch.
>
> On Fri, Jul 31, 2020 at 10:24:46AM +0100, Lad Prabhakar wrote:
> > During testing this sensor on iW-RainboW-G21D-Qseven platform noticed the
> > capture worked only for first run and for subsequent runs it failed.
> >
> > This patch does the following in DVP mode:
> > 1: Enables data lines on power up
> > 2: Configures HVP lines on power up instead of configuring everytime on
> > stream ON/OFF
> > 3: Disables MIPI interface.
> > 4: Puts the sensor in power down mode during stream OFF.
>
> Could you detail a little the underlying problem, the environment where it
> can be reproduced and how the patch addresses it, please?
>
my bad.
> Are you using CSI-2 or the parallel interface, for instance?
>
while using the sensor in parallel interface mode (DVP) 8-bit mode,
with rcar-vin bridge noticed the capture worked fine for the first run
(with yavta), but for subsequent runs the bridge driver waited for the
frame to be captured. Debugging further noticed the data lines were
enabled/disabled in stream on/off callback. But enabling the data
lines in startup (as done in the patch) fixed this issue.
Without this patch I can confirm the i2c writes were happening in
stream on/off callback and the values were updated in the respective
register to enable/disable datalines. (I didn't find any information
relating to sequence of enabling the data lines in data sheet [1])
[1] https://cdn.sparkfun.com/datasheets/Sensors/LightImaging/OV5640_datasheet.pdf
> >
> > Fixes: f22996db44e2d ("media: ov5640: add support of DVP parallel interface")
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > Reviewed-by: Biju Das <biju.das.jz@...renesas.com>
> > ---
> > drivers/media/i2c/ov5640.c | 253 +++++++++++++++++++++------------------------
> > 1 file changed, 120 insertions(+), 133 deletions(-)
> >
> > diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c
> > index 2fe4a7a..ac305a5 100644
> > --- a/drivers/media/i2c/ov5640.c
> > +++ b/drivers/media/i2c/ov5640.c
> > @@ -274,7 +274,7 @@ static inline struct v4l2_subdev *ctrl_to_sd(struct v4l2_ctrl *ctrl)
> > /* YUV422 UYVY VGA@...ps */
> > static const struct reg_value ov5640_init_setting_30fps_VGA[] = {
> > {0x3103, 0x11, 0, 0}, {0x3008, 0x82, 0, 5}, {0x3008, 0x42, 0, 0},
> > - {0x3103, 0x03, 0, 0}, {0x3017, 0x00, 0, 0}, {0x3018, 0x00, 0, 0},
> > + {0x3103, 0x03, 0, 0},
> > {0x3630, 0x36, 0, 0},
> > {0x3631, 0x0e, 0, 0}, {0x3632, 0xe2, 0, 0}, {0x3633, 0x12, 0, 0},
> > {0x3621, 0xe0, 0, 0}, {0x3704, 0xa0, 0, 0}, {0x3703, 0x5a, 0, 0},
> > @@ -1210,96 +1210,7 @@ static int ov5640_set_autogain(struct ov5640_dev *sensor, bool on)
> >
> > static int ov5640_set_stream_dvp(struct ov5640_dev *sensor, bool on)
> > {
> > - int ret;
> > - unsigned int flags = sensor->ep.bus.parallel.flags;
> > - u8 pclk_pol = 0;
> > - u8 hsync_pol = 0;
> > - u8 vsync_pol = 0;
> > -
> > - /*
> > - * Note about parallel port configuration.
> > - *
> > - * When configured in parallel mode, the OV5640 will
> > - * output 10 bits data on DVP data lines [9:0].
> > - * If only 8 bits data are wanted, the 8 bits data lines
> > - * of the camera interface must be physically connected
> > - * on the DVP data lines [9:2].
> > - *
> > - * Control lines polarity can be configured through
> > - * devicetree endpoint control lines properties.
> > - * If no endpoint control lines properties are set,
> > - * polarity will be as below:
> > - * - VSYNC: active high
> > - * - HREF: active low
> > - * - PCLK: active low
> > - */
> > -
> > - if (on) {
> > - /*
> > - * configure parallel port control lines polarity
> > - *
> > - * POLARITY CTRL0
> > - * - [5]: PCLK polarity (0: active low, 1: active high)
> > - * - [1]: HREF polarity (0: active low, 1: active high)
> > - * - [0]: VSYNC polarity (mismatch here between
> > - * datasheet and hardware, 0 is active high
> > - * and 1 is active low...)
> > - */
> > - if (flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
> > - pclk_pol = 1;
> > - if (flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
> > - hsync_pol = 1;
> > - if (flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
> > - vsync_pol = 1;
> > -
> > - ret = ov5640_write_reg(sensor,
> > - OV5640_REG_POLARITY_CTRL00,
> > - (pclk_pol << 5) |
> > - (hsync_pol << 1) |
> > - vsync_pol);
> > -
> > - if (ret)
> > - return ret;
> > - }
> > -
> > - /*
> > - * powerdown MIPI TX/RX PHY & disable MIPI
> > - *
> > - * MIPI CONTROL 00
> > - * 4: PWDN PHY TX
> > - * 3: PWDN PHY RX
> > - * 2: MIPI enable
> > - */
> > - ret = ov5640_write_reg(sensor,
> > - OV5640_REG_IO_MIPI_CTRL00, on ? 0x18 : 0);
> > - if (ret)
> > - return ret;
> > -
> > - /*
> > - * enable VSYNC/HREF/PCLK DVP control lines
> > - * & D[9:6] DVP data lines
> > - *
> > - * PAD OUTPUT ENABLE 01
> > - * - 6: VSYNC output enable
> > - * - 5: HREF output enable
> > - * - 4: PCLK output enable
> > - * - [3:0]: D[9:6] output enable
> > - */
> > - ret = ov5640_write_reg(sensor,
> > - OV5640_REG_PAD_OUTPUT_ENABLE01,
> > - on ? 0x7f : 0);
> > - if (ret)
> > - return ret;
> > -
> > - /*
> > - * enable D[5:0] DVP data lines
> > - *
> > - * PAD OUTPUT ENABLE 02
> > - * - [7:2]: D[5:0] output enable
> > - */
> > - return ov5640_write_reg(sensor,
> > - OV5640_REG_PAD_OUTPUT_ENABLE02,
> > - on ? 0xfc : 0);
> > + return ov5640_write_reg(sensor, OV5640_REG_SYS_CTRL0, on ? 0x2 : 0x42);
> > }
> >
> > static int ov5640_set_stream_mipi(struct ov5640_dev *sensor, bool on)
> > @@ -2003,6 +1914,10 @@ static void ov5640_set_power_off(struct ov5640_dev *sensor)
> >
> > static int ov5640_set_power(struct ov5640_dev *sensor, bool on)
> > {
> > + unsigned int flags = sensor->ep.bus.parallel.flags;
> > + u8 pclk_pol = 0;
> > + u8 hsync_pol = 0;
> > + u8 vsync_pol = 0;
> > int ret = 0;
> >
> > if (on) {
> > @@ -2014,52 +1929,124 @@ static int ov5640_set_power(struct ov5640_dev *sensor, bool on)
> > if (ret)
> > goto power_off;
> >
> > - /* We're done here for DVP bus, while CSI-2 needs setup. */
> > - if (sensor->ep.bus_type != V4L2_MBUS_CSI2_DPHY)
> > - return 0;
> > + /* CSI-2 setup. */
> > + if (sensor->ep.bus_type == V4L2_MBUS_CSI2_DPHY) {
> > + /*
> > + * Power up MIPI HS Tx and LS Rx; 2 data lanes mode
> > + *
> > + * 0x300e = 0x40
> > + * [7:5] = 010 : 2 data lanes mode (see FIXME note in
> > + * "ov5640_set_stream_mipi()")
> > + * [4] = 0 : Power up MIPI HS Tx
> > + * [3] = 0 : Power up MIPI LS Rx
> > + * [2] = 0 : MIPI interface disabled
> > + */
> > + ret = ov5640_write_reg(sensor, OV5640_REG_IO_MIPI_CTRL00, 0x40);
>
> Please wrap lines over 80 if it can be reasonably one.
>
checkpatch doesn't complain about it (size is increased to 100)?
Cheers,
Prabhakar
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