Hej Sakari,
On 2017-11-11 00:32:27 +0200, Sakari Ailus wrote:
> Hej Niklas,
>
> Tack för uppdaterade lappar! Jag har några kommentar nedan... det ser bra
> ut överallt.
Tack för din feedback!
>
> On Fri, Nov 10, 2017 at 02:31:37PM +0100, Niklas Söderlund wrote:
> > A V4L2 driver for Renesas R-Car MIPI CSI-2 receiver. The driver
> > supports the rcar-vin driver on R-Car Gen3 SoCs where separate CSI-2
> > hardware blocks are connected between the video sources and the video
> > grabbers (VIN).
> >
> > Driver is based on a prototype by Koji Matsuoka in the Renesas BSP.
> >
> > Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
> > ---
> > drivers/media/platform/rcar-vin/Kconfig | 12 +
> > drivers/media/platform/rcar-vin/Makefile | 1 +
> > drivers/media/platform/rcar-vin/rcar-csi2.c | 934 ++++++++++++++++++++++++++++
> > 3 files changed, 947 insertions(+)
> > create mode 100644 drivers/media/platform/rcar-vin/rcar-csi2.c
> >
> > diff --git a/drivers/media/platform/rcar-vin/Kconfig b/drivers/media/platform/rcar-vin/Kconfig
> > index af4c98b44d2e22cb..6875f30c1ae42631 100644
> > --- a/drivers/media/platform/rcar-vin/Kconfig
> > +++ b/drivers/media/platform/rcar-vin/Kconfig
> > @@ -1,3 +1,15 @@
> > +config VIDEO_RCAR_CSI2
> > + tristate "R-Car MIPI CSI-2 Receiver"
> > + depends on VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API && OF
> > + depends on ARCH_RENESAS || COMPILE_TEST
> > + select V4L2_FWNODE
> > + ---help---
> > + Support for Renesas R-Car MIPI CSI-2 receiver.
> > + Supports R-Car Gen3 SoCs.
> > +
> > + To compile this driver as a module, choose M here: the
> > + module will be called rcar-csi2.
> > +
> > config VIDEO_RCAR_VIN
> > tristate "R-Car Video Input (VIN) Driver"
> > depends on VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API && OF && HAS_DMA && MEDIA_CONTROLLER
> > diff --git a/drivers/media/platform/rcar-vin/Makefile b/drivers/media/platform/rcar-vin/Makefile
> > index 48c5632c21dc060b..5ab803d3e7c1aa57 100644
> > --- a/drivers/media/platform/rcar-vin/Makefile
> > +++ b/drivers/media/platform/rcar-vin/Makefile
> > @@ -1,3 +1,4 @@
> > rcar-vin-objs = rcar-core.o rcar-dma.o rcar-v4l2.o
> >
> > +obj-$(CONFIG_VIDEO_RCAR_CSI2) += rcar-csi2.o
> > obj-$(CONFIG_VIDEO_RCAR_VIN) += rcar-vin.o
> > diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c
> > new file mode 100644
> > index 0000000000000000..27d09da191a09b39
> > --- /dev/null
> > +++ b/drivers/media/platform/rcar-vin/rcar-csi2.c
> > @@ -0,0 +1,934 @@
> > +/*
> > + * Driver for Renesas R-Car MIPI CSI-2 Receiver
> > + *
> > + * Copyright (C) 2017 Renesas Electronics Corp.
> > + *
> > + * This program is free software; you can redistribute it and/or modify it
> > + * under the terms of the GNU General Public License as published by the
> > + * Free Software Foundation; either version 2 of the License, or (at your
> > + * option) any later version.
> > + */
> > +
> > +#include <linux/delay.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/io.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/of_device.h>
> > +#include <linux/of_graph.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/pm_runtime.h>
> > +#include <linux/sys_soc.h>
> > +
> > +#include <media/v4l2-ctrls.h>
> > +#include <media/v4l2-device.h>
> > +#include <media/v4l2-fwnode.h>
> > +#include <media/v4l2-mc.h>
> > +#include <media/v4l2-subdev.h>
> > +
> > +/* Register offsets and bits */
> > +
> > +/* Control Timing Select */
> > +#define TREF_REG 0x00
> > +#define TREF_TREF BIT(0)
> > +
> > +/* Software Reset */
> > +#define SRST_REG 0x04
> > +#define SRST_SRST BIT(0)
> > +
> > +/* PHY Operation Control */
> > +#define PHYCNT_REG 0x08
> > +#define PHYCNT_SHUTDOWNZ BIT(17)
> > +#define PHYCNT_RSTZ BIT(16)
> > +#define PHYCNT_ENABLECLK BIT(4)
> > +#define PHYCNT_ENABLE_3 BIT(3)
> > +#define PHYCNT_ENABLE_2 BIT(2)
> > +#define PHYCNT_ENABLE_1 BIT(1)
> > +#define PHYCNT_ENABLE_0 BIT(0)
> > +
> > +/* Checksum Control */
> > +#define CHKSUM_REG 0x0c
> > +#define CHKSUM_ECC_EN BIT(1)
> > +#define CHKSUM_CRC_EN BIT(0)
> > +
> > +/*
> > + * Channel Data Type Select
> > + * VCDT[0-15]: Channel 1 VCDT[16-31]: Channel 2
> > + * VCDT2[0-15]: Channel 3 VCDT2[16-31]: Channel 4
> > + */
> > +#define VCDT_REG 0x10
> > +#define VCDT2_REG 0x14
> > +#define VCDT_VCDTN_EN BIT(15)
> > +#define VCDT_SEL_VC(n) (((n) & 0x3) << 8)
> > +#define VCDT_SEL_DTN_ON BIT(6)
> > +#define VCDT_SEL_DT(n) (((n) & 0x3f) << 0)
> > +
> > +/* Frame Data Type Select */
> > +#define FRDT_REG 0x18
> > +
> > +/* Field Detection Control */
> > +#define FLD_REG 0x1c
> > +#define FLD_FLD_NUM(n) (((n) & 0xff) << 16)
> > +#define FLD_FLD_EN4 BIT(3)
> > +#define FLD_FLD_EN3 BIT(2)
> > +#define FLD_FLD_EN2 BIT(1)
> > +#define FLD_FLD_EN BIT(0)
> > +
> > +/* Automatic Standby Control */
> > +#define ASTBY_REG 0x20
> > +
> > +/* Long Data Type Setting 0 */
> > +#define LNGDT0_REG 0x28
> > +
> > +/* Long Data Type Setting 1 */
> > +#define LNGDT1_REG 0x2c
> > +
> > +/* Interrupt Enable */
> > +#define INTEN_REG 0x30
> > +
> > +/* Interrupt Source Mask */
> > +#define INTCLOSE_REG 0x34
> > +
> > +/* Interrupt Status Monitor */
> > +#define INTSTATE_REG 0x38
> > +#define INTSTATE_INT_ULPS_START BIT(7)
> > +#define INTSTATE_INT_ULPS_END BIT(6)
> > +
> > +/* Interrupt Error Status Monitor */
> > +#define INTERRSTATE_REG 0x3c
> > +
> > +/* Short Packet Data */
> > +#define SHPDAT_REG 0x40
> > +
> > +/* Short Packet Count */
> > +#define SHPCNT_REG 0x44
> > +
> > +/* LINK Operation Control */
> > +#define LINKCNT_REG 0x48
> > +#define LINKCNT_MONITOR_EN BIT(31)
> > +#define LINKCNT_REG_MONI_PACT_EN BIT(25)
> > +#define LINKCNT_ICLK_NONSTOP BIT(24)
> > +
> > +/* Lane Swap */
> > +#define LSWAP_REG 0x4c
> > +#define LSWAP_L3SEL(n) (((n) & 0x3) << 6)
> > +#define LSWAP_L2SEL(n) (((n) & 0x3) << 4)
> > +#define LSWAP_L1SEL(n) (((n) & 0x3) << 2)
> > +#define LSWAP_L0SEL(n) (((n) & 0x3) << 0)
> > +
> > +/* PHY Test Interface Write Register */
> > +#define PHTW_REG 0x50
> > +
> > +/* PHY Test Interface Clear */
> > +#define PHTC_REG 0x58
> > +#define PHTC_TESTCLR BIT(0)
> > +
> > +/* PHY Frequency Control */
> > +#define PHYPLL_REG 0x68
> > +#define PHYPLL_HSFREQRANGE(n) ((n) << 16)
> > +
> > +struct phypll_hsfreqrange {
> > + u16 mbps;
> > + u16 reg;
> > +};
> > +
> > +static const struct phypll_hsfreqrange hsfreqrange_h3_v3h_m3n[] = {
> > + { .mbps = 80, .reg = 0x00 },
> > + { .mbps = 90, .reg = 0x10 },
> > + { .mbps = 100, .reg = 0x20 },
> > + { .mbps = 110, .reg = 0x30 },
> > + { .mbps = 120, .reg = 0x01 },
> > + { .mbps = 130, .reg = 0x11 },
> > + { .mbps = 140, .reg = 0x21 },
> > + { .mbps = 150, .reg = 0x31 },
> > + { .mbps = 160, .reg = 0x02 },
> > + { .mbps = 170, .reg = 0x12 },
> > + { .mbps = 180, .reg = 0x22 },
> > + { .mbps = 190, .reg = 0x32 },
> > + { .mbps = 205, .reg = 0x03 },
> > + { .mbps = 220, .reg = 0x13 },
> > + { .mbps = 235, .reg = 0x23 },
> > + { .mbps = 250, .reg = 0x33 },
> > + { .mbps = 275, .reg = 0x04 },
> > + { .mbps = 300, .reg = 0x14 },
> > + { .mbps = 325, .reg = 0x25 },
> > + { .mbps = 350, .reg = 0x35 },
> > + { .mbps = 400, .reg = 0x05 },
> > + { .mbps = 450, .reg = 0x26 },
> > + { .mbps = 500, .reg = 0x36 },
> > + { .mbps = 550, .reg = 0x37 },
> > + { .mbps = 600, .reg = 0x07 },
> > + { .mbps = 650, .reg = 0x18 },
> > + { .mbps = 700, .reg = 0x28 },
> > + { .mbps = 750, .reg = 0x39 },
> > + { .mbps = 800, .reg = 0x09 },
> > + { .mbps = 850, .reg = 0x19 },
> > + { .mbps = 900, .reg = 0x29 },
> > + { .mbps = 950, .reg = 0x3a },
> > + { .mbps = 1000, .reg = 0x0a },
> > + { .mbps = 1050, .reg = 0x1a },
> > + { .mbps = 1100, .reg = 0x2a },
> > + { .mbps = 1150, .reg = 0x3b },
> > + { .mbps = 1200, .reg = 0x0b },
> > + { .mbps = 1250, .reg = 0x1b },
> > + { .mbps = 1300, .reg = 0x2b },
> > + { .mbps = 1350, .reg = 0x3c },
> > + { .mbps = 1400, .reg = 0x0c },
> > + { .mbps = 1450, .reg = 0x1c },
> > + { .mbps = 1500, .reg = 0x2c },
> > + /* guard */
> > + { .mbps = 0, .reg = 0x00 },
> > +};
> > +
> > +static const struct phypll_hsfreqrange hsfreqrange_m3w_h3es1[] = {
> > + { .mbps = 80, .reg = 0x00 },
> > + { .mbps = 90, .reg = 0x10 },
> > + { .mbps = 100, .reg = 0x20 },
> > + { .mbps = 110, .reg = 0x30 },
> > + { .mbps = 120, .reg = 0x01 },
> > + { .mbps = 130, .reg = 0x11 },
> > + { .mbps = 140, .reg = 0x21 },
> > + { .mbps = 150, .reg = 0x31 },
> > + { .mbps = 160, .reg = 0x02 },
> > + { .mbps = 170, .reg = 0x12 },
> > + { .mbps = 180, .reg = 0x22 },
> > + { .mbps = 190, .reg = 0x32 },
> > + { .mbps = 205, .reg = 0x03 },
> > + { .mbps = 220, .reg = 0x13 },
> > + { .mbps = 235, .reg = 0x23 },
> > + { .mbps = 250, .reg = 0x33 },
> > + { .mbps = 275, .reg = 0x04 },
> > + { .mbps = 300, .reg = 0x14 },
> > + { .mbps = 325, .reg = 0x05 },
> > + { .mbps = 350, .reg = 0x15 },
> > + { .mbps = 400, .reg = 0x25 },
> > + { .mbps = 450, .reg = 0x06 },
> > + { .mbps = 500, .reg = 0x16 },
> > + { .mbps = 550, .reg = 0x07 },
> > + { .mbps = 600, .reg = 0x17 },
> > + { .mbps = 650, .reg = 0x08 },
> > + { .mbps = 700, .reg = 0x18 },
> > + { .mbps = 750, .reg = 0x09 },
> > + { .mbps = 800, .reg = 0x19 },
> > + { .mbps = 850, .reg = 0x29 },
> > + { .mbps = 900, .reg = 0x39 },
> > + { .mbps = 950, .reg = 0x0A },
> > + { .mbps = 1000, .reg = 0x1A },
> > + { .mbps = 1050, .reg = 0x2A },
> > + { .mbps = 1100, .reg = 0x3A },
> > + { .mbps = 1150, .reg = 0x0B },
> > + { .mbps = 1200, .reg = 0x1B },
> > + { .mbps = 1250, .reg = 0x2B },
> > + { .mbps = 1300, .reg = 0x3B },
> > + { .mbps = 1350, .reg = 0x0C },
> > + { .mbps = 1400, .reg = 0x1C },
> > + { .mbps = 1450, .reg = 0x2C },
> > + { .mbps = 1500, .reg = 0x3C },
> > + /* guard */
> > + { .mbps = 0, .reg = 0x00 },
> > +};
> > +
> > +/* PHY ESC Error Monitor */
> > +#define PHEERM_REG 0x74
> > +
> > +/* PHY Clock Lane Monitor */
> > +#define PHCLM_REG 0x78
> > +
> > +/* PHY Data Lane Monitor */
> > +#define PHDLM_REG 0x7c
> > +
> > +/* CSI0CLK Frequency Configuration Preset Register */
> > +#define CSI0CLKFCPR_REG 0x260
> > +#define CSI0CLKFREQRANGE(n) ((n & 0x3f) << 16)
> > +
> > +struct rcar_csi2_format {
> > + unsigned int code;
> > + unsigned int datatype;
> > + unsigned int bpp;
> > +};
> > +
> > +static const struct rcar_csi2_format rcar_csi2_formats[] = {
> > + { .code = MEDIA_BUS_FMT_RGB888_1X24, .datatype = 0x24, .bpp = 24 },
> > + { .code = MEDIA_BUS_FMT_UYVY8_1X16, .datatype = 0x1e, .bpp = 16 },
> > + { .code = MEDIA_BUS_FMT_UYVY8_2X8, .datatype = 0x1e, .bpp = 16 },
> > + { .code = MEDIA_BUS_FMT_YUYV10_2X10, .datatype = 0x1e, .bpp = 16 },
> > +};
> > +
> > +static const struct rcar_csi2_format *rcar_csi2_code_to_fmt(unsigned int code)
> > +{
> > + unsigned int i;
> > +
> > + for (i = 0; i < ARRAY_SIZE(rcar_csi2_formats); i++)
> > + if (rcar_csi2_formats[i].code == code)
> > + return rcar_csi2_formats + i;
>
> Extra newline would be nice.
Yes :-)
>
> > + return NULL;
> > +}
> > +
> > +enum rcar_csi2_pads {
> > + RCAR_CSI2_SINK,
> > + RCAR_CSI2_SOURCE_VC0,
> > + RCAR_CSI2_SOURCE_VC1,
> > + RCAR_CSI2_SOURCE_VC2,
> > + RCAR_CSI2_SOURCE_VC3,
> > + NR_OF_RCAR_CSI2_PAD,
> > +};
> > +
> > +struct rcar_csi2_info {
> > + const struct phypll_hsfreqrange *hsfreqrange;
> > + unsigned int csi0clkfreqrange;
> > + bool clear_ulps;
> > + bool have_phtw;
> > +};
> > +
> > +struct rcar_csi2 {
> > + struct device *dev;
> > + void __iomem *base;
> > + const struct rcar_csi2_info *info;
> > +
> > + struct v4l2_subdev subdev;
> > + struct media_pad pads[NR_OF_RCAR_CSI2_PAD];
> > +
> > + struct v4l2_async_notifier notifier;
> > + struct v4l2_async_subdev remote;
> > +
> > + struct v4l2_mbus_framefmt mf;
> > +
> > + struct mutex lock;
> > + int stream_count;
> > +
> > + unsigned short lanes;
> > + unsigned char lane_swap[4];
> > +};
> > +
> > +static inline struct rcar_csi2 *sd_to_csi2(struct v4l2_subdev *sd)
> > +{
> > + return container_of(sd, struct rcar_csi2, subdev);
> > +}
> > +
> > +static inline struct rcar_csi2 *notifier_to_csi2(struct v4l2_async_notifier *n)
> > +{
> > + return container_of(n, struct rcar_csi2, notifier);
> > +}
> > +
> > +static u32 rcar_csi2_read(struct rcar_csi2 *priv, unsigned int reg)
> > +{
> > + return ioread32(priv->base + reg);
> > +}
> > +
> > +static void rcar_csi2_write(struct rcar_csi2 *priv, unsigned int reg, u32 data)
> > +{
> > + iowrite32(data, priv->base + reg);
> > +}
> > +
> > +static void rcar_csi2_reset(struct rcar_csi2 *priv)
> > +{
> > + rcar_csi2_write(priv, SRST_REG, SRST_SRST);
> > + usleep_range(100, 150);
> > + rcar_csi2_write(priv, SRST_REG, 0);
> > +}
> > +
> > +static int rcar_csi2_wait_phy_start(struct rcar_csi2 *priv)
> > +{
> > + int timeout;
> > +
> > + /* Wait for the clock and data lanes to enter LP-11 state. */
> > + for (timeout = 100; timeout > 0; timeout--) {
> > + const u32 lane_mask = (1 << priv->lanes) - 1;
> > +
> > + if ((rcar_csi2_read(priv, PHCLM_REG) & 1) == 1 &&
> > + (rcar_csi2_read(priv, PHDLM_REG) & lane_mask) == lane_mask)
> > + return 0;
> > +
> > + msleep(20);
> > + }
> > +
> > + dev_err(priv->dev, "Timeout waiting for LP-11 state\n");
> > +
> > + return -ETIMEDOUT;
> > +}
> > +
> > +static int rcar_csi2_calc_phypll(struct rcar_csi2 *priv,
> > + struct v4l2_subdev *source,
> > + struct v4l2_mbus_framefmt *mf,
> > + u32 *phypll)
> > +{
> > + const struct phypll_hsfreqrange *hsfreq;
> > + const struct rcar_csi2_format *format;
> > + struct v4l2_ctrl *ctrl;
> > + u64 mbps;
> > +
> > + ctrl = v4l2_ctrl_find(source->ctrl_handler, V4L2_CID_PIXEL_RATE);
>
> How about LINK_FREQ instead? It'd be more straightforward to calculate
> this. Up to you.
I need to use PIXEL_RATE as my test setup uses the adv748x driver which
only implement that control. In the short term I would like to support
both, but I need a setup to test that before I can add support for it.
In the long term, maybe we should deprecate one of the controls?
>
> > + if (!ctrl) {
> > + dev_err(priv->dev, "no link freq control in subdev %s\n",
> > + source->name);
> > + return -EINVAL;
> > + }
> > +
> > + format = rcar_csi2_code_to_fmt(mf->code);
> > + if (!format) {
> > + dev_err(priv->dev, "Unknown format: %d\n", mf->code);
> > + return -EINVAL;
> > + }
> > +
> > + mbps = v4l2_ctrl_g_ctrl_int64(ctrl) * format->bpp;
> > + do_div(mbps, priv->lanes * 1000000);
> > +
> > + for (hsfreq = priv->info->hsfreqrange; hsfreq->mbps != 0; hsfreq++)
> > + if (hsfreq->mbps >= mbps)
> > + break;
> > +
> > + if (!hsfreq->mbps) {
> > + dev_err(priv->dev, "Unsupported PHY speed (%llu Mbps)", mbps);
> > + return -ERANGE;
> > + }
> > +
> > + dev_dbg(priv->dev, "PHY HSFREQRANGE requested %llu got %u Mbps\n", mbps,
> > + hsfreq->mbps);
> > +
> > + *phypll = PHYPLL_HSFREQRANGE(hsfreq->reg);
> > +
> > + return 0;
> > +}
> > +
> > +static int rcar_csi2_start(struct rcar_csi2 *priv)
> > +{
> > + const struct rcar_csi2_format *format;
> > + struct v4l2_subdev_format fmt;
> > + struct media_pad *pad, *source_pad;
> > + struct v4l2_subdev *source = NULL;
> > + struct v4l2_mbus_framefmt *mf = &fmt.format;
> > + u32 phycnt, phypll, tmp;
> > + u32 vcdt = 0, vcdt2 = 0;
> > + unsigned int i;
> > + int ret;
> > +
> > + pad = &priv->subdev.entity.pads[RCAR_CSI2_SINK];
> > + source_pad = media_entity_remote_pad(pad);
> > + if (!source_pad) {
> > + dev_err(priv->dev, "Could not find remote source pad\n");
> > + return -ENODEV;
> > + }
> > +
> > + source = media_entity_to_v4l2_subdev(source_pad->entity);
> > + if (!source) {
> > + dev_err(priv->dev, "Could not find remote subdevice\n");
> > + return -ENODEV;
> > + }
>
> Something must be really, really wrong if the above would happen. A pad
> without an entity?
Good catch, I will remove the unneeded check.
>
> > +
> > + dev_dbg(priv->dev, "Using source %s pad: %u\n", source->name,
> > + source_pad->index);
> > +
> > + fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
> > + fmt.pad = source_pad->index;
> > + ret = v4l2_subdev_call(source, pad, get_fmt, NULL, &fmt);
> > + if (ret)
> > + return ret;
>
> The link format has been validated already by this point this isn't
> supposed to fail or produce different results than in link validation.
>
> You could get the same format from the local pad, too.
Another good catch, I will use the format stored locally to make the
code simpler. As you state the formats are already validated so it's
safe to do so. I still need to get the remote subdevice to be able to
read the PIXEL_RATE control, but I can move that to
rcar_csi2_calc_phypll() where it's actually used.
>
> > +
> > + dev_dbg(priv->dev, "Input size (%ux%u%c)\n", mf->width,
> > + mf->height, mf->field == V4L2_FIELD_NONE ? 'p' : 'i');
> > +
> > + /*
> > + * Enable all Virtual Channels
> > + *
> > + * NOTE: It's not possible to get individual format for each
> > + * source virtual channel. Once this is possible in V4L2
> > + * it should be used here.
> > + */
> > + for (i = 0; i < 4; i++) {
> > + format = rcar_csi2_code_to_fmt(mf->code);
> > + if (!format) {
> > + dev_err(priv->dev, "Unsupported media bus format: %d\n",
> > + mf->code);
> > + return -EINVAL;
> > + }
> > +
> > + tmp = VCDT_SEL_VC(i) | VCDT_VCDTN_EN | VCDT_SEL_DTN_ON |
> > + VCDT_SEL_DT(format->datatype);
> > +
> > + /* Store in correct reg and offset */
> > + if (i < 2)
> > + vcdt |= tmp << ((i % 2) * 16);
> > + else
> > + vcdt2 |= tmp << ((i % 2) * 16);
> > + }
> > +
> > + switch (priv->lanes) {
> > + case 1:
> > + phycnt = PHYCNT_ENABLECLK | PHYCNT_ENABLE_0;
> > + break;
> > + case 2:
> > + phycnt = PHYCNT_ENABLECLK | PHYCNT_ENABLE_1 | PHYCNT_ENABLE_0;
> > + break;
> > + case 4:
> > + phycnt = PHYCNT_ENABLECLK | PHYCNT_ENABLE_3 | PHYCNT_ENABLE_2 |
> > + PHYCNT_ENABLE_1 | PHYCNT_ENABLE_0;
> > + break;
> > + default:
> > + return -EINVAL;
> > + }
> > +
> > + ret = rcar_csi2_calc_phypll(priv, source, mf, &phypll);
> > + if (ret)
> > + return ret;
> > +
> > + /* Clear Ultra Low Power interrupt */
> > + if (priv->info->clear_ulps)
> > + rcar_csi2_write(priv, INTSTATE_REG,
> > + INTSTATE_INT_ULPS_START |
> > + INTSTATE_INT_ULPS_END);
> > +
> > + /* Init */
> > + rcar_csi2_write(priv, TREF_REG, TREF_TREF);
> > + rcar_csi2_reset(priv);
> > + rcar_csi2_write(priv, PHTC_REG, 0);
> > +
> > + /* Configure */
> > + rcar_csi2_write(priv, FLD_REG, FLD_FLD_NUM(2) | FLD_FLD_EN4 |
> > + FLD_FLD_EN3 | FLD_FLD_EN2 | FLD_FLD_EN);
> > + rcar_csi2_write(priv, VCDT_REG, vcdt);
> > + rcar_csi2_write(priv, VCDT2_REG, vcdt2);
> > + /* Lanes are zero indexed */
> > + rcar_csi2_write(priv, LSWAP_REG,
> > + LSWAP_L0SEL(priv->lane_swap[0] - 1) |
> > + LSWAP_L1SEL(priv->lane_swap[1] - 1) |
> > + LSWAP_L2SEL(priv->lane_swap[2] - 1) |
> > + LSWAP_L3SEL(priv->lane_swap[3] - 1));
> > +
> > + if (priv->info->have_phtw) {
> > + /*
> > + * This is for H3 ES2.0
> > + *
> > + * NOTE: Additional logic is needed here when
> > + * support for V3H and/or M3-N is added
> > + */
> > + rcar_csi2_write(priv, PHTW_REG, 0x01cc01e2);
> > + rcar_csi2_write(priv, PHTW_REG, 0x010101e3);
> > + rcar_csi2_write(priv, PHTW_REG, 0x010101e4);
> > + rcar_csi2_write(priv, PHTW_REG, 0x01100104);
> > + rcar_csi2_write(priv, PHTW_REG, 0x01030100);
> > + rcar_csi2_write(priv, PHTW_REG, 0x01800100);
> > + }
> > +
> > + /* Start */
> > + rcar_csi2_write(priv, PHYPLL_REG, phypll);
> > +
> > + /* Set frequency range if we have it */
> > + if (priv->info->csi0clkfreqrange)
> > + rcar_csi2_write(priv, CSI0CLKFCPR_REG,
> > + CSI0CLKFREQRANGE(priv->info->csi0clkfreqrange));
> > +
> > + rcar_csi2_write(priv, PHYCNT_REG, phycnt);
> > + rcar_csi2_write(priv, LINKCNT_REG, LINKCNT_MONITOR_EN |
> > + LINKCNT_REG_MONI_PACT_EN | LINKCNT_ICLK_NONSTOP);
> > + rcar_csi2_write(priv, PHYCNT_REG, phycnt | PHYCNT_SHUTDOWNZ);
> > + rcar_csi2_write(priv, PHYCNT_REG, phycnt | PHYCNT_SHUTDOWNZ |
> > + PHYCNT_RSTZ);
> > +
> > + return rcar_csi2_wait_phy_start(priv);
> > +}
> > +
> > +static void rcar_csi2_stop(struct rcar_csi2 *priv)
> > +{
> > + rcar_csi2_write(priv, PHYCNT_REG, 0);
> > +
> > + rcar_csi2_reset(priv);
> > +}
> > +
> > +static int rcar_csi2_sd_info(struct rcar_csi2 *priv, struct v4l2_subdev **sd)
> > +{
> > + struct media_pad *pad;
> > +
> > + pad = media_entity_remote_pad(&priv->pads[RCAR_CSI2_SINK]);
> > + if (!pad) {
> > + dev_err(priv->dev, "Could not find remote pad\n");
> > + return -ENODEV;
> > + }
> > +
> > + *sd = media_entity_to_v4l2_subdev(pad->entity);
> > + if (!*sd) {
> > + dev_err(priv->dev, "Could not find remote subdevice\n");
> > + return -ENODEV;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int rcar_csi2_s_stream(struct v4l2_subdev *sd, int enable)
> > +{
> > + struct rcar_csi2 *priv = sd_to_csi2(sd);
> > + struct v4l2_subdev *nextsd;
> > + int ret;
> > +
> > + mutex_lock(&priv->lock);
> > +
> > + ret = rcar_csi2_sd_info(priv, &nextsd);
> > + if (ret)
> > + goto out;
> > +
> > + if (enable && priv->stream_count == 0) {
> > + ret = rcar_csi2_start(priv);
> > + if (ret)
> > + goto out;
> > +
> > + ret = v4l2_subdev_call(nextsd, video, s_stream, 1);
> > + if (ret) {
> > + rcar_csi2_stop(priv);
> > + goto out;
> > + }
> > + } else if (!enable && priv->stream_count == 1) {
> > + rcar_csi2_stop(priv);
> > + ret = v4l2_subdev_call(nextsd, video, s_stream, 0);
> > + }
> > +
> > + priv->stream_count += enable ? 1 : -1;
> > +out:
> > + mutex_unlock(&priv->lock);
> > +
> > + return ret;
> > +}
> > +
> > +static int rcar_csi2_s_power(struct v4l2_subdev *sd, int on)
> > +{
> > + struct rcar_csi2 *priv = sd_to_csi2(sd);
> > +
> > + if (on)
> > + pm_runtime_get_sync(priv->dev);
> > + else
> > + pm_runtime_put(priv->dev);
>
> The pipeline you have is already rather complex. Would it be an option to
> power the hardware on when streaming is started? The smiapp driver does
> this, without even implementing the s_power callback. (You'd still need to
> call it on the image source, as long as we have drivers that need it.)
I tested this early in early development for this driver and back then I
could not. But now 10 versions later it is possible so will do so for
version 11 :-) Really good you pointed this out, makes the code much
better thanks!
>
> > +
> > + return 0;
> > +}
> > +
> > +static int rcar_csi2_set_pad_format(struct v4l2_subdev *sd,
> > + struct v4l2_subdev_pad_config *cfg,
> > + struct v4l2_subdev_format *format)
> > +{
> > + struct rcar_csi2 *priv = sd_to_csi2(sd);
> > + struct v4l2_mbus_framefmt *framefmt;
> > +
>
> Is everything possible? For instance, are there limits regarding width or
> height? Or the pixel code? They should be checked here.
Yes it do care about pixel code which was only validated at s_stream()
time, will move the check here thanks!
>
> Also the format on the source pad is, presumably, dependent on the format
> on the sink pad.
Yes, but since this driver can't change the format in any way is there
any harm in mirror whatever is set on one pad on the other(s)? This will
change once multiple stream support is added in a later series.
>
> > + if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
> > + priv->mf = format->format;
> > + } else {
> > + framefmt = v4l2_subdev_get_try_format(sd, cfg, 0);
> > + *framefmt = format->format;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int rcar_csi2_get_pad_format(struct v4l2_subdev *sd,
> > + struct v4l2_subdev_pad_config *cfg,
> > + struct v4l2_subdev_format *format)
> > +{
> > + struct rcar_csi2 *priv = sd_to_csi2(sd);
> > +
> > + if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE)
> > + format->format = priv->mf;
> > + else
> > + format->format = *v4l2_subdev_get_try_format(sd, cfg, 0);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct v4l2_subdev_video_ops rcar_csi2_video_ops = {
> > + .s_stream = rcar_csi2_s_stream,
> > +};
> > +
> > +static const struct v4l2_subdev_core_ops rcar_csi2_subdev_core_ops = {
> > + .s_power = rcar_csi2_s_power,
> > +};
> > +
> > +static const struct v4l2_subdev_pad_ops rcar_csi2_pad_ops = {
> > + .set_fmt = rcar_csi2_set_pad_format,
> > + .get_fmt = rcar_csi2_get_pad_format,
> > +};
> > +
> > +static const struct v4l2_subdev_ops rcar_csi2_subdev_ops = {
> > + .video = &rcar_csi2_video_ops,
> > + .core = &rcar_csi2_subdev_core_ops,
> > + .pad = &rcar_csi2_pad_ops,
> > +};
> > +
> > +/* -----------------------------------------------------------------------------
> > + * Async and registered of subdevices and links
> > + */
> > +
> > +static int rcar_csi2_notify_bound(struct v4l2_async_notifier *notifier,
> > + struct v4l2_subdev *subdev,
> > + struct v4l2_async_subdev *asd)
> > +{
> > + struct rcar_csi2 *priv = notifier_to_csi2(notifier);
> > + int pad;
> > +
> > + v4l2_set_subdev_hostdata(subdev, priv);
> > +
> > + pad = media_entity_get_fwnode_pad(&subdev->entity,
> > + asd->match.fwnode.fwnode,
> > + MEDIA_PAD_FL_SOURCE);
> > + if (pad < 0) {
> > + dev_err(priv->dev, "Failed to find pad for %s\n", subdev->name);
> > + return pad;
> > + }
> > +
> > + dev_dbg(priv->dev, "Bound %s pad: %d\n", subdev->name, pad);
> > +
> > + return media_create_pad_link(&subdev->entity, pad,
> > + &priv->subdev.entity, 0,
> > + MEDIA_LNK_FL_ENABLED |
> > + MEDIA_LNK_FL_IMMUTABLE);
> > +}
> > +
> > +static void rcar_csi2_notify_unbind(struct v4l2_async_notifier *notifier,
> > + struct v4l2_subdev *subdev,
> > + struct v4l2_async_subdev *asd)
> > +{
> > + struct rcar_csi2 *priv = notifier_to_csi2(notifier);
> > +
> > + dev_dbg(priv->dev, "Unbind %s\n", subdev->name);
>
> This doesn't really do anything. I'd probably just remove this.
I liked the debug message when running bind/unbind tests, but you are
right it adds no real value and I can just as easily move this to a
local test patch. Will remove for next version.
>
> > +}
> > +
> > +static const struct v4l2_async_notifier_operations rcar_csi2_notify_ops = {
> > + .bound = rcar_csi2_notify_bound,
> > + .unbind = rcar_csi2_notify_unbind,
> > +};
> > +
> > +static int rcar_csi2_parse_v4l2(struct rcar_csi2 *priv,
> > + struct v4l2_fwnode_endpoint *vep)
> > +{
> > + unsigned int i;
> > +
> > + /* Only port 0 enpoint 0 is valid */
> > + if (vep->base.port || vep->base.id)
> > + return -ENOTCONN;
> > +
> > + if (vep->bus_type != V4L2_MBUS_CSI2) {
> > + dev_err(priv->dev, "Unsupported bus: 0x%x\n", vep->bus_type);
> > + return -EINVAL;
> > + }
> > +
> > + priv->lanes = vep->bus.mipi_csi2.num_data_lanes;
> > + if (priv->lanes != 1 && priv->lanes != 2 && priv->lanes != 4) {
> > + dev_err(priv->dev, "Unsupported number of data-lanes: %d\n",
> > + priv->lanes);
> > + return -EINVAL;
> > + }
> > +
> > + for (i = 0; i < ARRAY_SIZE(priv->lane_swap); i++) {
> > + priv->lane_swap[i] = i < priv->lanes ?
> > + vep->bus.mipi_csi2.data_lanes[i] : i;
> > +
> > + /* Check for valid lane number */
> > + if (priv->lane_swap[i] < 1 || priv->lane_swap[i] > 4) {
> > + dev_err(priv->dev, "data-lanes must be in 1-4 range\n");
> > + return -EINVAL;
> > + }
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int rcar_csi2_parse_dt(struct rcar_csi2 *priv)
> > +{
> > + struct device_node *ep;
> > + struct v4l2_fwnode_endpoint v4l2_ep;
> > + int ret;
> > +
> > + ep = of_graph_get_endpoint_by_regs(priv->dev->of_node, 0, 0);
> > + if (!ep) {
> > + dev_err(priv->dev, "Not connected to subdevice\n");
> > + return -EINVAL;
> > + }
> > +
> > + ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep), &v4l2_ep);
> > + if (ret) {
> > + dev_err(priv->dev, "Could not parse v4l2 endpoint\n");
> > + of_node_put(ep);
> > + return -EINVAL;
> > + }
> > +
> > + ret = rcar_csi2_parse_v4l2(priv, &v4l2_ep);
> > + if (ret)
> > + return ret;
> > +
> > + priv->remote.match.fwnode.fwnode =
> > + fwnode_graph_get_remote_endpoint(of_fwnode_handle(ep));
> > + priv->remote.match_type = V4L2_ASYNC_MATCH_FWNODE;
> > +
> > + of_node_put(ep);
> > +
> > + priv->notifier.subdevs = devm_kzalloc(priv->dev,
> > + sizeof(*priv->notifier.subdevs),
> > + GFP_KERNEL);
> > + if (priv->notifier.subdevs == NULL)
> > + return -ENOMEM;
> > +
> > + priv->notifier.num_subdevs = 1;
> > + priv->notifier.subdevs[0] = &priv->remote;
> > + priv->notifier.ops = &rcar_csi2_notify_ops;
> > +
> > + dev_dbg(priv->dev, "Found '%pOF'\n",
> > + to_of_node(priv->remote.match.fwnode.fwnode));
> > +
> > + return v4l2_async_subdev_notifier_register(&priv->subdev,
> > + &priv->notifier);
>
> Could you use v4l2_async_notifier_parse_fwnode_endpoints_by_port() or does
> something bad happen if you do? The intent with that was to avoid functions
> like the above in drivers.
Unfortunately not :-(
I have a local patch which do this, but it won't work since this driver
needs to register remote endpoints (fwnode_graph_get_remote_endpoint()
above) and not the remote parent in the async framework. The reason for
this is that that is what the adv748x driver registers with the async
framework given that it only have one node in DT but registers multiple
subdevices. I would love to in the future resolve this in the helper
functions and switch to such a helper here.
>
> > +}
> > +
> > +/* -----------------------------------------------------------------------------
> > + * Platform Device Driver
> > + */
> > +
> > +static const struct media_entity_operations rcar_csi2_entity_ops = {
> > + .link_validate = v4l2_subdev_link_validate,
> > +};
> > +
> > +static int rcar_csi2_probe_resources(struct rcar_csi2 *priv,
> > + struct platform_device *pdev)
> > +{
> > + struct resource *res;
> > + int irq;
> > +
> > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > + priv->base = devm_ioremap_resource(&pdev->dev, res);
> > + if (IS_ERR(priv->base))
> > + return PTR_ERR(priv->base);
> > +
> > + irq = platform_get_irq(pdev, 0);
> > + if (irq < 0)
> > + return irq;
> > +
> > + return 0;
> > +}
> > +
> > +static const struct rcar_csi2_info rcar_csi2_info_r8a7795 = {
> > + .hsfreqrange = hsfreqrange_h3_v3h_m3n,
> > + .clear_ulps = true,
> > + .have_phtw = true,
> > + .csi0clkfreqrange = 0x20,
> > +};
> > +
> > +static const struct rcar_csi2_info rcar_csi2_info_r8a7795es1 = {
> > + .hsfreqrange = hsfreqrange_m3w_h3es1,
> > +};
> > +
> > +static const struct rcar_csi2_info rcar_csi2_info_r8a7796 = {
> > + .hsfreqrange = hsfreqrange_m3w_h3es1,
> > +};
> > +
> > +static const struct of_device_id rcar_csi2_of_table[] = {
> > + {
> > + .compatible = "renesas,r8a7795-csi2",
> > + .data = &rcar_csi2_info_r8a7795,
> > + },
> > + {
> > + .compatible = "renesas,r8a7796-csi2",
> > + .data = &rcar_csi2_info_r8a7796,
> > + },
> > + { /* sentinel */ },
> > +};
> > +MODULE_DEVICE_TABLE(of, rcar_csi2_of_table);
> > +
> > +static const struct soc_device_attribute r8a7795es1[] = {
> > + {
> > + .soc_id = "r8a7795", .revision = "ES1.*",
> > + .data = &rcar_csi2_info_r8a7795es1,
> > + },
> > + { /* sentinel */}
> > +};
> > +
> > +static int rcar_csi2_probe(struct platform_device *pdev)
> > +{
> > + const struct soc_device_attribute *attr;
> > + struct rcar_csi2 *priv;
> > + unsigned int i;
> > + int ret;
> > +
> > + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> > + if (!priv)
> > + return -ENOMEM;
> > +
> > + priv->info = of_device_get_match_data(&pdev->dev);
> > +
> > + /* r8a7795 ES1.x behaves different then ES2.0+ but no own compat */
> > + attr = soc_device_match(r8a7795es1);
> > + if (attr)
> > + priv->info = attr->data;
> > +
> > + priv->dev = &pdev->dev;
> > +
> > + mutex_init(&priv->lock);
> > + priv->stream_count = 0;
> > +
> > + ret = rcar_csi2_probe_resources(priv, pdev);
> > + if (ret) {
> > + dev_err(priv->dev, "Failed to get resources\n");
> > + return ret;
> > + }
> > +
> > + platform_set_drvdata(pdev, priv);
> > +
> > + ret = rcar_csi2_parse_dt(priv);
> > + if (ret)
> > + return ret;
> > +
> > + priv->subdev.owner = THIS_MODULE;
> > + priv->subdev.dev = &pdev->dev;
> > + v4l2_subdev_init(&priv->subdev, &rcar_csi2_subdev_ops);
> > + v4l2_set_subdevdata(&priv->subdev, &pdev->dev);
> > + snprintf(priv->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s %s",
> > + KBUILD_MODNAME, dev_name(&pdev->dev));
> > + priv->subdev.flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
> > +
> > + priv->subdev.entity.function = MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER;
> > + priv->subdev.entity.ops = &rcar_csi2_entity_ops;
> > +
> > + priv->pads[RCAR_CSI2_SINK].flags = MEDIA_PAD_FL_SINK;
> > + for (i = RCAR_CSI2_SOURCE_VC0; i < NR_OF_RCAR_CSI2_PAD; i++)
> > + priv->pads[i].flags = MEDIA_PAD_FL_SOURCE;
> > +
> > + ret = media_entity_pads_init(&priv->subdev.entity, NR_OF_RCAR_CSI2_PAD,
> > + priv->pads);
> > + if (ret)
> > + goto error;
> > +
> > + ret = v4l2_async_register_subdev(&priv->subdev);
> > + if (ret < 0)
> > + goto error;
> > +
> > + pm_runtime_enable(&pdev->dev);
> > +
> > + dev_info(priv->dev, "%d lanes found\n", priv->lanes);
> > +
> > + return 0;
> > +
> > +error:
> > + v4l2_async_notifier_cleanup(&priv->notifier);
> > +
> > + return ret;
> > +}
> > +
> > +static int rcar_csi2_remove(struct platform_device *pdev)
> > +{
> > + struct rcar_csi2 *priv = platform_get_drvdata(pdev);
> > +
> > + v4l2_async_notifier_cleanup(&priv->notifier);
> > + v4l2_async_unregister_subdev(&priv->subdev);
> > +
> > + pm_runtime_disable(&pdev->dev);
> > +
> > + return 0;
> > +}
> > +
> > +static struct platform_driver __refdata rcar_csi2_pdrv = {
> > + .remove = rcar_csi2_remove,
> > + .probe = rcar_csi2_probe,
> > + .driver = {
> > + .name = "rcar-csi2",
> > + .of_match_table = of_match_ptr(rcar_csi2_of_table),
> > + },
> > +};
> > +
> > +module_platform_driver(rcar_csi2_pdrv);
> > +
> > +MODULE_AUTHOR("Niklas Söderlund <niklas.soderlund@xxxxxxxxxxxx>");
> > +MODULE_DESCRIPTION("Renesas R-Car MIPI CSI-2 receiver");
> > +MODULE_LICENSE("GPL v2");
>
> --
> Kind regards,
>
> Sakari Ailus
> e-mail: sakari.ailus@xxxxxx
--
Regards,
Niklas Söderlund
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