The STM32 CSI controller is tightly coupled with the DCMIPP and act as an input stage to receive data coming from the sensor and transferring them into the DCMIPP. Signed-off-by: Alain Volmat <alain.volmat@xxxxxxxxxxx> --- MAINTAINERS | 8 + drivers/media/platform/st/stm32/Kconfig | 14 + drivers/media/platform/st/stm32/Makefile | 1 + drivers/media/platform/st/stm32/stm32-csi.c | 1150 +++++++++++++++++++++++++++ 4 files changed, 1173 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index c27f3190737f..9bdc3aa4bcf5 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -14376,6 +14376,14 @@ W: https://linuxtv.org T: git git://linuxtv.org/media_tree.git F: drivers/media/dvb-frontends/stv6111* +MEDIA DRIVERS FOR STM32 - CSI +M: Alain Volmat <alain.volmat@xxxxxxxxxxx> +L: linux-media@xxxxxxxxxxxxxxx +S: Supported +T: git git://linuxtv.org/media_tree.git +F: Documentation/devicetree/bindings/media/st,stm32-csi.yaml +F: drivers/media/platform/stm32/stm32-csi.c + MEDIA DRIVERS FOR STM32 - DCMI / DCMIPP M: Hugues Fruchet <hugues.fruchet@xxxxxxxxxxx> M: Alain Volmat <alain.volmat@xxxxxxxxxxx> diff --git a/drivers/media/platform/st/stm32/Kconfig b/drivers/media/platform/st/stm32/Kconfig index 9df9a2a17728..f12e67bcc9bc 100644 --- a/drivers/media/platform/st/stm32/Kconfig +++ b/drivers/media/platform/st/stm32/Kconfig @@ -1,6 +1,20 @@ # SPDX-License-Identifier: GPL-2.0-only # V4L drivers +config VIDEO_STM32_CSI + tristate "STM32 Camera Serial Interface (CSI) support" + depends on V4L_PLATFORM_DRIVERS + depends on VIDEO_DEV && OF + depends on ARCH_STM32 || COMPILE_TEST + select MEDIA_CONTROLLER + select V4L2_FWNODE + help + This module makes the STM32 Camera Serial Interface (CSI) + available as a v4l2 device. + + To compile this driver as a module, choose M here: the module + will be called stm32-csi. + config VIDEO_STM32_DCMI tristate "STM32 Digital Camera Memory Interface (DCMI) support" depends on V4L_PLATFORM_DRIVERS diff --git a/drivers/media/platform/st/stm32/Makefile b/drivers/media/platform/st/stm32/Makefile index 7ed8297b9b19..9ae57897f030 100644 --- a/drivers/media/platform/st/stm32/Makefile +++ b/drivers/media/platform/st/stm32/Makefile @@ -1,4 +1,5 @@ # SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_VIDEO_STM32_CSI) += stm32-csi.o obj-$(CONFIG_VIDEO_STM32_DCMI) += stm32-dcmi.o obj-$(CONFIG_VIDEO_STM32_DCMIPP) += stm32-dcmipp/ stm32-dma2d-objs := dma2d/dma2d.o dma2d/dma2d-hw.o diff --git a/drivers/media/platform/st/stm32/stm32-csi.c b/drivers/media/platform/st/stm32/stm32-csi.c new file mode 100644 index 000000000000..51c4dc114f4a --- /dev/null +++ b/drivers/media/platform/st/stm32/stm32-csi.c @@ -0,0 +1,1150 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Driver for STM32 Camera Serial Interface + * + * Copyright (C) STMicroelectronics SA 2024 + * Author: Alain Volmat <alain.volmat@xxxxxxxxxxx> + * for STMicroelectronics. + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/reset.h> +#include <linux/slab.h> + +#include <media/mipi-csi2.h> +#include <media/v4l2-fwnode.h> +#include <media/v4l2-subdev.h> + +#define STM32_CSI_CR 0x0000 +#define STM32_CSI_CR_CSIEN BIT(0) +#define STM32_CSI_CR_VCXSTART(x) BIT(2 + ((x) * 4)) +#define STM32_CSI_CR_VCXSTOP(x) BIT(3 + ((x) * 4)) +#define STM32_CSI_PCR 0x0004 +#define STM32_CSI_PCR_DL1EN BIT(3) +#define STM32_CSI_PCR_DL0EN BIT(2) +#define STM32_CSI_PCR_CLEN BIT(1) +#define STM32_CSI_PCR_PWRDOWN BIT(0) +#define STM32_CSI_VCXCFGR1(x) ((((x) + 1) * 0x0010) + 0x0) +#define STM32_CSI_VCXCFGR1_ALLDT BIT(0) +#define STM32_CSI_VCXCFGR1_DT0EN BIT(1) +#define STM32_CSI_VCXCFGR1_DT1EN BIT(2) +#define STM32_CSI_VCXCFGR1_CDTFT_SHIFT 8 +#define STM32_CSI_VCXCFGR1_DT0_SHIFT 16 +#define STM32_CSI_VCXCFGR1_DT0FT_SHIFT 24 +#define STM32_CSI_VCXCFGR2(x) ((((x) + 1) * 0x0010) + 0x4) +#define STM32_CSI_VCXCFGR2_DT1_SHIFT 0 +#define STM32_CSI_VCXCFGR2_DT1FT_SHIFT 8 +#define STM32_CSI_INPUT_BPP8 2 +#define STM32_CSI_INPUT_BPP10 3 +#define STM32_CSI_INPUT_BPP12 4 +#define STM32_CSI_INPUT_BPP14 5 +#define STM32_CSI_LMCFGR 0x0070 +#define STM32_CSI_LMCFGR_LANENB_SHIFT 8 +#define STM32_CSI_LMCFGR_DLMAP_SHIFT 16 +#define STM32_CSI_IER0 0x0080 +#define STM32_CSI_IER1 0x0084 +#define STM32_CSI_SR0 0x0090 +#define STM32_CSI_SR0_SYNCERRF BIT(30) +#define STM32_CSI_SR0_SPKTERRF BIT(28) +#define STM32_CSI_SR0_IDERRF BIT(27) +#define STM32_CSI_SR0_CECCERRF BIT(26) +#define STM32_CSI_SR0_ECCERRF BIT(25) +#define STM32_CSI_SR0_CRCERRF BIT(24) +#define STM32_CSI_SR0_CCFIFOFF BIT(21) +#define STM32_CSI_SR0_VCXSTATEF(x) BIT(17 + (x)) +#define STM32_CSI_SR1 0x0094 +#define STM32_CSI_SR1_ECTRLDL1F BIT(12) +#define STM32_CSI_SR1_ESYNCESCDL1F BIT(11) +#define STM32_CSI_SR1_EESCDL1F BIT(10) +#define STM32_CSI_SR1_ESOTSYNCDL1F BIT(9) +#define STM32_CSI_SR1_ESOTDL1F BIT(8) +#define STM32_CSI_SR1_ECTRLDL0F BIT(4) +#define STM32_CSI_SR1_ESYNCESCDL0F BIT(3) +#define STM32_CSI_SR1_EESCDL0F BIT(2) +#define STM32_CSI_SR1_ESOTSYNCDL0F BIT(1) +#define STM32_CSI_SR1_ESOTDL0F BIT(0) +#define STM32_CSI_FCR0 0x0100 +#define STM32_CSI_FCR1 0x0104 +#define STM32_CSI_SPDFR 0x0110 +#define STM32_CSI_DT_MASK 0x3f +#define STM32_CSI_VC_MASK 0x03 +#define STM32_CSI_ERR1 0x0114 +#define STM32_CSI_ERR1_IDVCERR_SHIFT 22 +#define STM32_CSI_ERR1_IDDTERR_SHIFT 16 +#define STM32_CSI_ERR1_CECCVCERR_SHIFT 14 +#define STM32_CSI_ERR1_CECCDTERR_SHIFT 8 +#define STM32_CSI_ERR1_CRCVCERR_SHIFT 6 +#define STM32_CSI_ERR1_CRCDTERR_SHIFT 0 +#define STM32_CSI_ERR2 0x0118 +#define STM32_CSI_ERR2_SYNCVCERR_SHIFT 18 +#define STM32_CSI_ERR2_SPKTVCERR_SHIFT 6 +#define STM32_CSI_ERR2_SPKTDTERR_SHIFT 0 +#define STM32_CSI_PRCR 0x1000 +#define STM32_CSI_PRCR_PEN BIT(1) +#define STM32_CSI_PMCR 0x1004 +#define STM32_CSI_PFCR 0x1008 +#define STM32_CSI_PFCR_CCFR_MASK GENMASK(5, 0) +#define STM32_CSI_PFCR_CCFR_SHIFT 0 +#define STM32_CSI_PFCR_HSFR_MASK GENMASK(14, 8) +#define STM32_CSI_PFCR_HSFR_SHIFT 8 +#define STM32_CSI_PFCR_DLD BIT(16) +#define STM32_CSI_PTCR0 0x1010 +#define STM32_CSI_PTCR0_TCKEN BIT(0) +#define STM32_CSI_PTCR1 0x1014 +#define STM32_CSI_PTCR1_TWM BIT(16) +#define STM32_CSI_PTCR1_TDI_MASK GENMASK(7, 0) +#define STM32_CSI_PTCR1_TDI_SHIFT 0 +#define STM32_CSI_PTSR 0x1018 + +#define STM32_CSI_LANES_MAX 2 + +#define STM32_CSI_SR0_ERRORS (STM32_CSI_SR0_SYNCERRF | STM32_CSI_SR0_SPKTERRF |\ + STM32_CSI_SR0_IDERRF | STM32_CSI_SR0_CECCERRF |\ + STM32_CSI_SR0_ECCERRF | STM32_CSI_SR0_CRCERRF |\ + STM32_CSI_SR0_CCFIFOFF) +#define STM32_CSI_SR1_DL0_ERRORS (STM32_CSI_SR1_ECTRLDL0F | STM32_CSI_SR1_ESYNCESCDL0F |\ + STM32_CSI_SR1_EESCDL0F | STM32_CSI_SR1_ESOTSYNCDL0F |\ + STM32_CSI_SR1_ESOTDL0F) +#define STM32_CSI_SR1_DL1_ERRORS (STM32_CSI_SR1_ECTRLDL1F | STM32_CSI_SR1_ESYNCESCDL1F |\ + STM32_CSI_SR1_EESCDL1F | STM32_CSI_SR1_ESOTSYNCDL1F |\ + STM32_CSI_SR1_ESOTDL1F) +#define STM32_CSI_SR1_ERRORS (STM32_CSI_SR1_DL0_ERRORS | STM32_CSI_SR1_DL1_ERRORS) + +enum stm32_csi_pads { + STM32_CSI_PAD_SINK, + STM32_CSI_PAD_SOURCE, + STM32_CSI_PAD_MAX, +}; + +struct stm32_csi_event { + u32 mask; + const char * const name; +}; + +static const struct stm32_csi_event stm32_csi_events_sr0[] = { + {STM32_CSI_SR0_SYNCERRF, "Synchronization error"}, + {STM32_CSI_SR0_SPKTERRF, "Short packet error"}, + {STM32_CSI_SR0_IDERRF, "Data type ID error"}, + {STM32_CSI_SR0_CECCERRF, "Corrected ECC error"}, + {STM32_CSI_SR0_ECCERRF, "ECC error"}, + {STM32_CSI_SR0_CRCERRF, "CRC error"}, + {STM32_CSI_SR0_CCFIFOFF, "Clk changer FIFO full error"}, +}; + +#define STM32_CSI_NUM_SR0_EVENTS ARRAY_SIZE(stm32_csi_events_sr0) + +static const struct stm32_csi_event stm32_csi_events_sr1[] = { + {STM32_CSI_SR1_ECTRLDL1F, "L1: D-PHY control error"}, + {STM32_CSI_SR1_ESYNCESCDL1F, + "L1: D-PHY low power data transmission synchro error"}, + {STM32_CSI_SR1_EESCDL1F, "L1: D-PHY escape entry error"}, + {STM32_CSI_SR1_ESOTSYNCDL1F, + "L1: Start of transmission synchro error"}, + {STM32_CSI_SR1_ESOTDL1F, "L1: Start of transmission error"}, + {STM32_CSI_SR1_ECTRLDL0F, "L0: D-PHY control error"}, + {STM32_CSI_SR1_ESYNCESCDL0F, + "L0: D-PHY low power data transmission synchro error"}, + {STM32_CSI_SR1_EESCDL0F, "L0: D-PHY escape entry error"}, + {STM32_CSI_SR1_ESOTSYNCDL0F, + "L0: Start of transmission synchro error"}, + {STM32_CSI_SR1_ESOTDL0F, "L0: Start of transmission error"}, +}; + +#define STM32_CSI_NUM_SR1_EVENTS ARRAY_SIZE(stm32_csi_events_sr1) + +struct stm32_csi_dev { + struct device *dev; + + void __iomem *base; + struct clk *pclk; + struct clk *txesc; + struct clk *csi2phy; + struct regulator_bulk_data supplies[2]; + struct reset_control *rstc; + + u8 lanes[STM32_CSI_LANES_MAX]; + u8 num_lanes; + + /* + * spinlock slock is used to protect to srX_counters tables being + * accessed from log_status and interrupt context + */ + spinlock_t slock; + + u32 sr0_counters[STM32_CSI_NUM_SR0_EVENTS]; + u32 sr1_counters[STM32_CSI_NUM_SR1_EVENTS]; + + struct v4l2_subdev sd; + struct v4l2_async_notifier notifier; + struct media_pad pads[STM32_CSI_PAD_MAX]; + + /* Remote source */ + struct v4l2_subdev *s_subdev; + u32 s_subdev_pad_nb; +}; + +struct stm32_csi_fmts { + u32 code; + u32 datatype; + u32 input_fmt; + u8 bpp; +}; + +#define FMT_MBUS_DT_DTFMT_BPP(mbus, dt, input, byteperpixel) \ + { \ + .code = MEDIA_BUS_FMT_##mbus, \ + .datatype = MIPI_CSI2_DT_##dt, \ + .input_fmt = STM32_CSI_INPUT_##input, \ + .bpp = byteperpixel, \ + } +static const struct stm32_csi_fmts stm32_csi_formats[] = { + /* YUV 422 8 bit */ + FMT_MBUS_DT_DTFMT_BPP(UYVY8_1X16, YUV422_8B, BPP8, 8), + FMT_MBUS_DT_DTFMT_BPP(YUYV8_1X16, YUV422_8B, BPP8, 8), + FMT_MBUS_DT_DTFMT_BPP(YVYU8_1X16, YUV422_8B, BPP8, 8), + FMT_MBUS_DT_DTFMT_BPP(VYUY8_1X16, YUV422_8B, BPP8, 8), + + /* Raw Bayer */ + /* 8 bit */ + FMT_MBUS_DT_DTFMT_BPP(SBGGR8_1X8, RAW8, BPP8, 8), + FMT_MBUS_DT_DTFMT_BPP(SGBRG8_1X8, RAW8, BPP8, 8), + FMT_MBUS_DT_DTFMT_BPP(SGRBG8_1X8, RAW8, BPP8, 8), + FMT_MBUS_DT_DTFMT_BPP(SRGGB8_1X8, RAW8, BPP8, 8), + /* 10 bit */ + FMT_MBUS_DT_DTFMT_BPP(SRGGB10_1X10, RAW10, BPP10, 10), + FMT_MBUS_DT_DTFMT_BPP(SGBRG10_1X10, RAW10, BPP10, 10), + FMT_MBUS_DT_DTFMT_BPP(SGRBG10_1X10, RAW10, BPP10, 10), + FMT_MBUS_DT_DTFMT_BPP(SRGGB10_1X10, RAW10, BPP10, 10), + /* 12 bit */ + FMT_MBUS_DT_DTFMT_BPP(SRGGB12_1X12, RAW12, BPP12, 12), + FMT_MBUS_DT_DTFMT_BPP(SGBRG12_1X12, RAW12, BPP12, 12), + FMT_MBUS_DT_DTFMT_BPP(SGRBG12_1X12, RAW12, BPP12, 12), + FMT_MBUS_DT_DTFMT_BPP(SRGGB12_1X12, RAW12, BPP12, 12), + /* 14 bit */ + FMT_MBUS_DT_DTFMT_BPP(SRGGB14_1X14, RAW14, BPP14, 14), + FMT_MBUS_DT_DTFMT_BPP(SGBRG14_1X14, RAW14, BPP14, 14), + FMT_MBUS_DT_DTFMT_BPP(SGRBG14_1X14, RAW14, BPP14, 14), + FMT_MBUS_DT_DTFMT_BPP(SRGGB14_1X14, RAW14, BPP14, 14), + + /* RGB 565 */ + FMT_MBUS_DT_DTFMT_BPP(RGB565_1X16, RGB565, BPP8, 8), + + /* JPEG (datatype isn't used) */ + FMT_MBUS_DT_DTFMT_BPP(JPEG_1X8, NULL, BPP8, 8), +}; + +struct stm32_csi_mbps_phy_reg { + unsigned int mbps; + unsigned int hsfreqrange; + unsigned int osc_freq_target; +}; + +/* + * Table describing configuration of the PHY depending on the + * intended Bit Rate. From table 5-8 Frequency Ranges and Defaults + * of the Synopsis DWC MIPI PHY databook + */ +static const struct stm32_csi_mbps_phy_reg snps_stm32mp25[] = { + { .mbps = 80, .hsfreqrange = 0x00, .osc_freq_target = 460 }, + { .mbps = 90, .hsfreqrange = 0x10, .osc_freq_target = 460 }, + { .mbps = 100, .hsfreqrange = 0x20, .osc_freq_target = 460 }, + { .mbps = 110, .hsfreqrange = 0x30, .osc_freq_target = 460 }, + { .mbps = 120, .hsfreqrange = 0x01, .osc_freq_target = 460 }, + { .mbps = 130, .hsfreqrange = 0x11, .osc_freq_target = 460 }, + { .mbps = 140, .hsfreqrange = 0x21, .osc_freq_target = 460 }, + { .mbps = 150, .hsfreqrange = 0x31, .osc_freq_target = 460 }, + { .mbps = 160, .hsfreqrange = 0x02, .osc_freq_target = 460 }, + { .mbps = 170, .hsfreqrange = 0x12, .osc_freq_target = 460 }, + { .mbps = 180, .hsfreqrange = 0x22, .osc_freq_target = 460 }, + { .mbps = 190, .hsfreqrange = 0x32, .osc_freq_target = 460 }, + { .mbps = 205, .hsfreqrange = 0x03, .osc_freq_target = 460 }, + { .mbps = 220, .hsfreqrange = 0x13, .osc_freq_target = 460 }, + { .mbps = 235, .hsfreqrange = 0x23, .osc_freq_target = 460 }, + { .mbps = 250, .hsfreqrange = 0x33, .osc_freq_target = 460 }, + { .mbps = 275, .hsfreqrange = 0x04, .osc_freq_target = 460 }, + { .mbps = 300, .hsfreqrange = 0x14, .osc_freq_target = 460 }, + { .mbps = 325, .hsfreqrange = 0x25, .osc_freq_target = 460 }, + { .mbps = 350, .hsfreqrange = 0x35, .osc_freq_target = 460 }, + { .mbps = 400, .hsfreqrange = 0x05, .osc_freq_target = 460 }, + { .mbps = 450, .hsfreqrange = 0x16, .osc_freq_target = 460 }, + { .mbps = 500, .hsfreqrange = 0x26, .osc_freq_target = 460 }, + { .mbps = 550, .hsfreqrange = 0x37, .osc_freq_target = 460 }, + { .mbps = 600, .hsfreqrange = 0x07, .osc_freq_target = 460 }, + { .mbps = 650, .hsfreqrange = 0x18, .osc_freq_target = 460 }, + { .mbps = 700, .hsfreqrange = 0x28, .osc_freq_target = 460 }, + { .mbps = 750, .hsfreqrange = 0x39, .osc_freq_target = 460 }, + { .mbps = 800, .hsfreqrange = 0x09, .osc_freq_target = 460 }, + { .mbps = 850, .hsfreqrange = 0x19, .osc_freq_target = 460 }, + { .mbps = 900, .hsfreqrange = 0x29, .osc_freq_target = 460 }, + { .mbps = 950, .hsfreqrange = 0x3a, .osc_freq_target = 460 }, + { .mbps = 1000, .hsfreqrange = 0x0a, .osc_freq_target = 460 }, + { .mbps = 1050, .hsfreqrange = 0x1a, .osc_freq_target = 460 }, + { .mbps = 1100, .hsfreqrange = 0x2a, .osc_freq_target = 460 }, + { .mbps = 1150, .hsfreqrange = 0x3b, .osc_freq_target = 460 }, + { .mbps = 1200, .hsfreqrange = 0x0b, .osc_freq_target = 460 }, + { .mbps = 1250, .hsfreqrange = 0x1b, .osc_freq_target = 460 }, + { .mbps = 1300, .hsfreqrange = 0x2b, .osc_freq_target = 460 }, + { .mbps = 1350, .hsfreqrange = 0x3c, .osc_freq_target = 460 }, + { .mbps = 1400, .hsfreqrange = 0x0c, .osc_freq_target = 460 }, + { .mbps = 1450, .hsfreqrange = 0x1c, .osc_freq_target = 460 }, + { .mbps = 1500, .hsfreqrange = 0x2c, .osc_freq_target = 460 }, + { .mbps = 1550, .hsfreqrange = 0x3d, .osc_freq_target = 285 }, + { .mbps = 1600, .hsfreqrange = 0x0d, .osc_freq_target = 295 }, + { .mbps = 1650, .hsfreqrange = 0x1d, .osc_freq_target = 304 }, + { .mbps = 1700, .hsfreqrange = 0x2e, .osc_freq_target = 313 }, + { .mbps = 1750, .hsfreqrange = 0x3e, .osc_freq_target = 322 }, + { .mbps = 1800, .hsfreqrange = 0x0e, .osc_freq_target = 331 }, + { .mbps = 1850, .hsfreqrange = 0x1e, .osc_freq_target = 341 }, + { .mbps = 1900, .hsfreqrange = 0x2f, .osc_freq_target = 350 }, + { .mbps = 1950, .hsfreqrange = 0x3f, .osc_freq_target = 359 }, + { .mbps = 2000, .hsfreqrange = 0x0f, .osc_freq_target = 368 }, + { .mbps = 2050, .hsfreqrange = 0x40, .osc_freq_target = 377 }, + { .mbps = 2100, .hsfreqrange = 0x41, .osc_freq_target = 387 }, + { .mbps = 2150, .hsfreqrange = 0x42, .osc_freq_target = 396 }, + { .mbps = 2200, .hsfreqrange = 0x43, .osc_freq_target = 405 }, + { .mbps = 2250, .hsfreqrange = 0x44, .osc_freq_target = 414 }, + { .mbps = 2300, .hsfreqrange = 0x45, .osc_freq_target = 423 }, + { .mbps = 2350, .hsfreqrange = 0x46, .osc_freq_target = 432 }, + { .mbps = 2400, .hsfreqrange = 0x47, .osc_freq_target = 442 }, + { .mbps = 2450, .hsfreqrange = 0x48, .osc_freq_target = 451 }, + { .mbps = 2500, .hsfreqrange = 0x49, .osc_freq_target = 460 }, + { /* sentinel */ } +}; + +static const struct v4l2_mbus_framefmt fmt_default = { + .width = 640, + .height = 480, + .code = MEDIA_BUS_FMT_RGB565_1X16, + .field = V4L2_FIELD_NONE, + .colorspace = V4L2_COLORSPACE_REC709, + .ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT, + .quantization = V4L2_QUANTIZATION_DEFAULT, + .xfer_func = V4L2_XFER_FUNC_DEFAULT, +}; + +static const struct stm32_csi_fmts *stm32_csi_code_to_fmt(unsigned int code) +{ + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(stm32_csi_formats); i++) + if (stm32_csi_formats[i].code == code) + return &stm32_csi_formats[i]; + + return NULL; +} + +static inline struct stm32_csi_dev *to_csidev(struct v4l2_subdev *sd) +{ + return container_of(sd, struct stm32_csi_dev, sd); +} + +static int stm32_csi_setup_lane_merger(struct stm32_csi_dev *csidev) +{ + u32 lmcfgr = 0; + int i; + + for (i = 0; i < csidev->num_lanes; i++) { + /* Check that lane ID is < max number of lane */ + if (csidev->lanes[i] >= STM32_CSI_LANES_MAX) { + dev_err(csidev->dev, "Invalid lane id (%d)\n", + csidev->lanes[i]); + return -EINVAL; + } + lmcfgr |= ((csidev->lanes[i] + 1) << ((i * 4) + + STM32_CSI_LMCFGR_DLMAP_SHIFT)); + } + + lmcfgr |= (csidev->num_lanes << STM32_CSI_LMCFGR_LANENB_SHIFT); + + writel_relaxed(lmcfgr, csidev->base + STM32_CSI_LMCFGR); + + return 0; +} + +static void stm32_csi_phy_reg_write(struct stm32_csi_dev *csidev, + u32 addr, u32 val) +{ + /* Based on sequence described at section 5.2.3.2 of DesignWave document */ + /* For writing the 4-bit testcode MSBs */ + /* Set testen to high */ + writel_relaxed(STM32_CSI_PTCR1_TWM, csidev->base + STM32_CSI_PTCR1); + + /* Set testclk to high */ + writel_relaxed(STM32_CSI_PTCR0_TCKEN, csidev->base + STM32_CSI_PTCR0); + + /* Place 0x00 in testdin */ + writel_relaxed(STM32_CSI_PTCR1_TWM, csidev->base + STM32_CSI_PTCR1); + + /* + * Set testclk to low (with the falling edge on testclk, the testdin + * signal content is latched internally) + */ + writel_relaxed(0, csidev->base + STM32_CSI_PTCR0); + + /* Set testen to low */ + writel_relaxed(0, csidev->base + STM32_CSI_PTCR1); + + /* Place the 8-bit word corresponding to the testcode MSBs in testdin */ + writel_relaxed(((addr >> 8) & STM32_CSI_PTCR1_TDI_MASK) << STM32_CSI_PTCR1_TDI_SHIFT, + csidev->base + STM32_CSI_PTCR1); + + /* Set testclk to high */ + writel_relaxed(STM32_CSI_PTCR0_TCKEN, csidev->base + STM32_CSI_PTCR0); + + /* For writing the 8-bit testcode LSBs */ + /* Set testclk to low */ + writel_relaxed(0, csidev->base + STM32_CSI_PTCR0); + + /* Set testen to high */ + writel_relaxed(STM32_CSI_PTCR1_TWM, csidev->base + STM32_CSI_PTCR1); + + /* Set testclk to high */ + writel_relaxed(STM32_CSI_PTCR0_TCKEN, csidev->base + STM32_CSI_PTCR0); + + /* Place the 8-bit word test data in testdin */ + writel_relaxed((addr & STM32_CSI_PTCR1_TDI_MASK) << + STM32_CSI_PTCR1_TDI_SHIFT | STM32_CSI_PTCR1_TWM, + csidev->base + STM32_CSI_PTCR1); + + /* + * Set testclk to low (with the falling edge on testclk, the testdin + * signal content is latched internally) + */ + writel_relaxed(0, csidev->base + STM32_CSI_PTCR0); + + /* Set testen to low */ + writel_relaxed(0, csidev->base + STM32_CSI_PTCR1); + + /* For writing the data */ + /* Place the 8-bit word corresponding to the page offset in testdin */ + writel_relaxed((val & STM32_CSI_PTCR1_TDI_MASK) << STM32_CSI_PTCR1_TDI_SHIFT, + csidev->base + STM32_CSI_PTCR1); + + /* Set testclk to high (test data is programmed internally */ + writel_relaxed(STM32_CSI_PTCR0_TCKEN, csidev->base + STM32_CSI_PTCR0); + + /* Finish by setting testclk to low */ + writel_relaxed(0, csidev->base + STM32_CSI_PTCR0); +} + +static int stm32_csi_start(struct stm32_csi_dev *csidev, + struct v4l2_subdev_state *state) +{ + const struct stm32_csi_mbps_phy_reg *phy_regs; + struct v4l2_mbus_framefmt *sink_fmt; + const struct stm32_csi_fmts *fmt; + unsigned long phy_clk_frate; + unsigned int mbps; + u32 lanes_ie = 0; + u32 lanes_en = 0; + s64 link_freq; + int ret, i; + u32 ccfr; + + dev_dbg(csidev->dev, "Starting the CSI2\n"); + + /* Get the bpp value on pad0 (input of CSI) */ + sink_fmt = v4l2_subdev_state_get_format(state, STM32_CSI_PAD_SINK); + fmt = stm32_csi_code_to_fmt(sink_fmt->code); + + /* Get the remote sensor link frequency */ + if (!csidev->s_subdev) + return -EIO; + + link_freq = v4l2_get_link_freq(csidev->s_subdev->ctrl_handler, + fmt->bpp, 2 * csidev->num_lanes); + if (link_freq < 0) + return link_freq; + + /* MBPS is expressed in Mbps, hence link_freq / 100000 * 2 */ + mbps = div_s64(link_freq, 500000); + dev_dbg(csidev->dev, "Computed Mbps: %u\n", mbps); + + for (phy_regs = snps_stm32mp25; phy_regs->mbps != 0; phy_regs++) + if (phy_regs->mbps >= mbps) + break; + + if (!phy_regs->mbps) { + dev_err(csidev->dev, "Unsupported PHY speed (%u Mbps)", mbps); + return -ERANGE; + } + + dev_dbg(csidev->dev, "PHY settings: (%u Mbps, %u HS FRange, %u OSC Freq)\n", + phy_regs->mbps, phy_regs->hsfreqrange, + phy_regs->osc_freq_target); + + /* Prepare lanes related configuration bits */ + for (i = 0; i < csidev->num_lanes; i++) { + if (!csidev->lanes[i]) { + lanes_ie |= STM32_CSI_SR1_DL0_ERRORS; + lanes_en |= STM32_CSI_PCR_DL0EN; + } else { + lanes_ie |= STM32_CSI_SR1_DL1_ERRORS; + lanes_en |= STM32_CSI_PCR_DL1EN; + } + } + + ret = pm_runtime_get_sync(csidev->dev); + if (ret < 0) + return ret; + + /* Retrieve CSI2PHY clock rate to compute CCFR value */ + phy_clk_frate = clk_get_rate(csidev->csi2phy); + if (!phy_clk_frate) { + pm_runtime_put(csidev->dev); + dev_err(csidev->dev, "CSI2PHY clock rate invalid (0)\n"); + return ret; + } + + ret = stm32_csi_setup_lane_merger(csidev); + if (ret) { + pm_runtime_put(csidev->dev); + return ret; + } + + /* Enable the CSI */ + writel_relaxed(STM32_CSI_CR_CSIEN, csidev->base + STM32_CSI_CR); + + /* Enable some global CSI related interrupts - bits are same as SR0 */ + writel_relaxed(STM32_CSI_SR0_ERRORS, csidev->base + STM32_CSI_IER0); + + /* Enable lanes related error interrupts */ + writel_relaxed(lanes_ie, csidev->base + STM32_CSI_IER1); + + /* Initialization of the D-PHY */ + /* Stop the D-PHY */ + writel_relaxed(0, csidev->base + STM32_CSI_PRCR); + + /* Keep the D-PHY in power down state */ + writel_relaxed(0, csidev->base + STM32_CSI_PCR); + + /* Enable testclr clock during 15ns */ + writel_relaxed(STM32_CSI_PTCR0_TCKEN, csidev->base + STM32_CSI_PTCR0); + udelay(1); + writel_relaxed(0, csidev->base + STM32_CSI_PTCR0); + + /* Set hsfreqrange */ + phy_clk_frate /= 1000000; + ccfr = (phy_clk_frate - 17) * 4; + writel_relaxed((ccfr << STM32_CSI_PFCR_CCFR_SHIFT) | + (phy_regs->hsfreqrange << STM32_CSI_PFCR_HSFR_SHIFT), + csidev->base + STM32_CSI_PFCR); + + /* set reg @08 deskew_polarity_rw 1'b1 */ + stm32_csi_phy_reg_write(csidev, 0x08, 0x38); + + /* set reg @0xE4 counter_for_des_en_config_if_rx 0x10 + DLL prog EN */ + /* This is because 13<= cfgclkfreqrange[5:0]<=38 */ + stm32_csi_phy_reg_write(csidev, 0xe4, 0x11); + + /* set reg @0xe2 & reg @0xe3 value DLL target oscilation freq */ + /* Based on the table page 77, osc_freq_target */ + stm32_csi_phy_reg_write(csidev, 0xe2, phy_regs->osc_freq_target & 0xFF); + stm32_csi_phy_reg_write(csidev, 0xe3, (phy_regs->osc_freq_target >> 8) & 0x0F); + + writel_relaxed(STM32_CSI_PFCR_DLD | readl_relaxed(csidev->base + STM32_CSI_PFCR), + csidev->base + STM32_CSI_PFCR); + + /* Enable Lanes */ + writel_relaxed(lanes_en | STM32_CSI_PCR_CLEN, csidev->base + STM32_CSI_PCR); + writel_relaxed(lanes_en | STM32_CSI_PCR_CLEN | STM32_CSI_PCR_PWRDOWN, + csidev->base + STM32_CSI_PCR); + + writel_relaxed(STM32_CSI_PRCR_PEN, csidev->base + STM32_CSI_PRCR); + + /* Remove the force */ + writel_relaxed(0, csidev->base + STM32_CSI_PMCR); + + return ret; +} + +static void stm32_csi_stop(struct stm32_csi_dev *csidev) +{ + dev_dbg(csidev->dev, "Stopping the CSI2\n"); + + /* Disable the D-PHY */ + writel_relaxed(0, csidev->base + STM32_CSI_PCR); + + /* Disable ITs */ + writel_relaxed(0, csidev->base + STM32_CSI_IER0); + writel_relaxed(0, csidev->base + STM32_CSI_IER1); + + /* Disable the CSI */ + writel_relaxed(0, csidev->base + STM32_CSI_CR); + + pm_runtime_put(csidev->dev); +} + +static int stm32_csi_start_vc(struct stm32_csi_dev *csidev, + struct v4l2_subdev_state *state, u32 vc) +{ + struct v4l2_mbus_framefmt *mbus_fmt; + const struct stm32_csi_fmts *fmt; + u32 cfgr1 = 0; + int ret = 0; + u32 status; + + mbus_fmt = v4l2_subdev_state_get_format(state, STM32_CSI_PAD_SOURCE); + fmt = stm32_csi_code_to_fmt(mbus_fmt->code); + + /* If the mbus code is JPEG, don't enable filtering */ + if (mbus_fmt->code == MEDIA_BUS_FMT_JPEG_1X8) { + cfgr1 |= STM32_CSI_VCXCFGR1_ALLDT; + cfgr1 |= fmt->input_fmt << STM32_CSI_VCXCFGR1_CDTFT_SHIFT; + dev_dbg(csidev->dev, "VC%d: enable AllDT mode\n", vc); + } else { + cfgr1 |= fmt->datatype << STM32_CSI_VCXCFGR1_DT0_SHIFT; + cfgr1 |= fmt->input_fmt << STM32_CSI_VCXCFGR1_DT0FT_SHIFT; + cfgr1 |= STM32_CSI_VCXCFGR1_DT0EN; + dev_dbg(csidev->dev, "VC%d: enable DT0(0x%x)/DT0FT(0x%x)\n", + vc, fmt->datatype, fmt->input_fmt); + } + writel_relaxed(cfgr1, csidev->base + STM32_CSI_VCXCFGR1(vc)); + + /* Enable processing of the virtual-channel and wait for its status */ + writel_relaxed(STM32_CSI_CR_VCXSTART(vc) | STM32_CSI_CR_CSIEN, + csidev->base + STM32_CSI_CR); + + ret = readl_relaxed_poll_timeout(csidev->base + STM32_CSI_SR0, + status, + status & STM32_CSI_SR0_VCXSTATEF(vc), + 1000, 1000000); + if (ret) { + dev_err(csidev->dev, "failed to start VC(%d)\n", vc); + return ret; + } + + return 0; +} + +static int stm32_csi_stop_vc(struct stm32_csi_dev *csidev, u32 vc) +{ + int ret = 0; + u32 status; + + /* Stop the Virtual Channel */ + writel_relaxed(STM32_CSI_CR_VCXSTOP(vc) | STM32_CSI_CR_CSIEN, + csidev->base + STM32_CSI_CR); + + ret = readl_relaxed_poll_timeout(csidev->base + STM32_CSI_SR0, + status, + !(status & STM32_CSI_SR0_VCXSTATEF(vc)), + 1000, 1000000); + if (ret) { + dev_err(csidev->dev, "failed to stop VC(%d)\n", vc); + return ret; + } + + /* Disable all DTs */ + writel_relaxed(0, csidev->base + STM32_CSI_VCXCFGR1(vc)); + writel_relaxed(0, csidev->base + STM32_CSI_VCXCFGR2(vc)); + + return 0; +} + +static int stm32_csi_disable_streams(struct v4l2_subdev *sd, + struct v4l2_subdev_state *state, u32 pad, + u64 streams_mask) +{ + struct stm32_csi_dev *csidev = to_csidev(sd); + int ret; + + ret = v4l2_subdev_disable_streams(csidev->s_subdev, + csidev->s_subdev_pad_nb, BIT_ULL(0)); + if (ret) + return ret; + + /* Stop the VC0 */ + ret = stm32_csi_stop_vc(csidev, 0); + if (ret) + dev_err(csidev->dev, "Failed to stop VC0\n"); + + stm32_csi_stop(csidev); + + return 0; +} + +static int stm32_csi_enable_streams(struct v4l2_subdev *sd, + struct v4l2_subdev_state *state, u32 pad, + u64 streams_mask) +{ + struct stm32_csi_dev *csidev = to_csidev(sd); + int ret; + + ret = stm32_csi_start(csidev, state); + if (ret) + return ret; + + /* Configure & start the VC0 */ + ret = stm32_csi_start_vc(csidev, state, 0); + if (ret) { + dev_err(csidev->dev, "Failed to start VC0\n"); + stm32_csi_stop(csidev); + return ret; + } + + ret = v4l2_subdev_enable_streams(csidev->s_subdev, + csidev->s_subdev_pad_nb, BIT_ULL(0)); + if (ret) { + stm32_csi_stop_vc(csidev, 0); + stm32_csi_stop(csidev); + return ret; + } + + return 0; +} + +static int stm32_csi_init_state(struct v4l2_subdev *sd, + struct v4l2_subdev_state *state) +{ + int i; + + for (i = 0; i < sd->entity.num_pads; i++) + *v4l2_subdev_state_get_format(state, i) = fmt_default; + + return 0; +} + +static int stm32_csi_enum_mbus_code(struct v4l2_subdev *sd, + struct v4l2_subdev_state *state, + struct v4l2_subdev_mbus_code_enum *code) +{ + if (code->index >= ARRAY_SIZE(stm32_csi_formats)) + return -EINVAL; + + code->code = stm32_csi_formats[code->index].code; + return 0; +} + +static int stm32_csi_set_pad_format(struct v4l2_subdev *sd, + struct v4l2_subdev_state *state, + struct v4l2_subdev_format *format) +{ + struct stm32_csi_dev *csidev = to_csidev(sd); + struct v4l2_mbus_framefmt *framefmt; + const struct stm32_csi_fmts *fmt; + + fmt = stm32_csi_code_to_fmt(format->format.code); + if (!fmt) { + dev_dbg(csidev->dev, "Unsupported code %d, use default\n", + format->format.code); + format->format.code = fmt_default.code; + } + + framefmt = v4l2_subdev_state_get_format(state, STM32_CSI_PAD_SINK); + + if (format->pad == STM32_CSI_PAD_SOURCE) + format->format = *framefmt; + else + *framefmt = format->format; + + framefmt = v4l2_subdev_state_get_format(state, STM32_CSI_PAD_SOURCE); + *framefmt = format->format; + + return 0; +} + +static int stm32_csi_log_status(struct v4l2_subdev *sd) +{ + struct stm32_csi_dev *csidev = to_csidev(sd); + unsigned long flags; + unsigned int i; + + spin_lock_irqsave(&csidev->slock, flags); + + for (i = 0; i < STM32_CSI_NUM_SR0_EVENTS; i++) { + if (csidev->sr0_counters[i]) + dev_info(csidev->dev, "%s events: %d\n", + stm32_csi_events_sr0[i].name, + csidev->sr0_counters[i]); + } + + for (i = 0; i < STM32_CSI_NUM_SR1_EVENTS; i++) { + if (csidev->sr1_counters[i]) + dev_info(csidev->dev, "%s events: %d\n", + stm32_csi_events_sr1[i].name, + csidev->sr1_counters[i]); + } + + spin_unlock_irqrestore(&csidev->slock, flags); + + return 0; +} + +static const struct v4l2_subdev_core_ops stm32_csi_core_ops = { + .log_status = stm32_csi_log_status, +}; + +static const struct v4l2_subdev_video_ops stm32_csi_video_ops = { + .s_stream = v4l2_subdev_s_stream_helper, +}; + +static const struct v4l2_subdev_pad_ops stm32_csi_pad_ops = { + .enum_mbus_code = stm32_csi_enum_mbus_code, + .set_fmt = stm32_csi_set_pad_format, + .get_fmt = v4l2_subdev_get_fmt, + .enable_streams = stm32_csi_enable_streams, + .disable_streams = stm32_csi_disable_streams, +}; + +static const struct v4l2_subdev_ops stm32_csi_subdev_ops = { + .core = &stm32_csi_core_ops, + .pad = &stm32_csi_pad_ops, + .video = &stm32_csi_video_ops, +}; + +static const struct v4l2_subdev_internal_ops stm32_csi_subdev_internal_ops = { + .init_state = stm32_csi_init_state, +}; + +static int stm32_csi_async_bound(struct v4l2_async_notifier *notifier, + struct v4l2_subdev *s_subdev, + struct v4l2_async_connection *asd) +{ + struct v4l2_subdev *sd = notifier->sd; + struct stm32_csi_dev *csidev = to_csidev(sd); + int remote_pad; + + remote_pad = media_entity_get_fwnode_pad(&s_subdev->entity, + s_subdev->fwnode, + MEDIA_PAD_FL_SOURCE); + if (remote_pad < 0) { + dev_err(csidev->dev, "Couldn't find output pad for subdev %s\n", + s_subdev->name); + return remote_pad; + } + + csidev->s_subdev = s_subdev; + csidev->s_subdev_pad_nb = remote_pad; + + return media_create_pad_link(&csidev->s_subdev->entity, + remote_pad, &csidev->sd.entity, + STM32_CSI_PAD_SINK, + MEDIA_LNK_FL_ENABLED | + MEDIA_LNK_FL_IMMUTABLE); +} + +static const struct v4l2_async_notifier_operations stm32_csi_notifier_ops = { + .bound = stm32_csi_async_bound, +}; + +static irqreturn_t stm32_csi_irq_thread(int irq, void *arg) +{ + struct stm32_csi_dev *csidev = arg; + unsigned long flags; + u32 sr0, sr1; + int i; + + sr0 = readl_relaxed(csidev->base + STM32_CSI_SR0); + sr1 = readl_relaxed(csidev->base + STM32_CSI_SR1); + + /* Clear interrupt */ + writel_relaxed(sr0 & STM32_CSI_SR0_ERRORS, + csidev->base + STM32_CSI_FCR0); + writel_relaxed(sr1 & STM32_CSI_SR1_ERRORS, + csidev->base + STM32_CSI_FCR1); + + spin_lock_irqsave(&csidev->slock, flags); + + for (i = 0; i < STM32_CSI_NUM_SR0_EVENTS; i++) + if (sr0 & stm32_csi_events_sr0[i].mask) + csidev->sr0_counters[i]++; + + for (i = 0; i < STM32_CSI_NUM_SR1_EVENTS; i++) + if (sr1 & stm32_csi_events_sr1[i].mask) + csidev->sr1_counters[i]++; + + spin_unlock_irqrestore(&csidev->slock, flags); + + return IRQ_HANDLED; +} + +static int stm32_csi_get_resources(struct stm32_csi_dev *csidev, + struct platform_device *pdev) +{ + int irq, ret; + + csidev->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL); + if (IS_ERR(csidev->base)) + return dev_err_probe(&pdev->dev, PTR_ERR(csidev->base), + "Failed to ioremap resource\n"); + + csidev->pclk = devm_clk_get(&pdev->dev, "pclk"); + if (IS_ERR(csidev->pclk)) + return dev_err_probe(&pdev->dev, PTR_ERR(csidev->pclk), + "Couldn't get pclk\n"); + + csidev->txesc = devm_clk_get(&pdev->dev, "txesc"); + if (IS_ERR(csidev->txesc)) + return dev_err_probe(&pdev->dev, PTR_ERR(csidev->txesc), + "Couldn't get txesc\n"); + + csidev->csi2phy = devm_clk_get(&pdev->dev, "csi2phy"); + if (IS_ERR(csidev->csi2phy)) + return dev_err_probe(&pdev->dev, PTR_ERR(csidev->csi2phy), + "Couldn't get csi2phy\n"); + + csidev->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL); + if (IS_ERR(csidev->rstc)) + return dev_err_probe(&pdev->dev, PTR_ERR(csidev->rstc), + "Couldn't get reset control\n"); + + csidev->supplies[0].supply = "vdd"; + csidev->supplies[1].supply = "vdda18"; + ret = devm_regulator_bulk_get(&pdev->dev, ARRAY_SIZE(csidev->supplies), + csidev->supplies); + if (ret) + return dev_err_probe(&pdev->dev, ret, + "Failed to request regulator vdd\n"); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, + stm32_csi_irq_thread, IRQF_ONESHOT, + dev_name(&pdev->dev), csidev); + if (ret) + return dev_err_probe(&pdev->dev, ret, + "Unable to request irq"); + + return 0; +} + +static int stm32_csi_parse_dt(struct stm32_csi_dev *csidev) +{ + struct v4l2_fwnode_endpoint v4l2_ep = { .bus_type = V4L2_MBUS_CSI2_DPHY }; + struct v4l2_async_connection *asd; + struct fwnode_handle *ep; + int ret; + + /* Get bus characteristics from devicetree */ + ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(csidev->dev), 0, 0, + FWNODE_GRAPH_ENDPOINT_NEXT); + if (!ep) { + dev_err(csidev->dev, "Could not find the endpoint\n"); + return -ENODEV; + } + + ret = v4l2_fwnode_endpoint_parse(ep, &v4l2_ep); + fwnode_handle_put(ep); + if (ret) { + dev_err(csidev->dev, "Could not parse v4l2 endpoint\n"); + return ret; + } + + csidev->num_lanes = v4l2_ep.bus.mipi_csi2.num_data_lanes; + if (csidev->num_lanes > STM32_CSI_LANES_MAX) { + dev_err(csidev->dev, "Unsupported number of data-lanes: %d\n", + csidev->num_lanes); + return -EINVAL; + } + + memcpy(csidev->lanes, v4l2_ep.bus.mipi_csi2.data_lanes, + sizeof(csidev->lanes)); + + ep = fwnode_graph_get_next_endpoint(dev_fwnode(csidev->dev), NULL); + if (!ep) { + dev_err(csidev->dev, "Failed to get next endpoint\n"); + return -EINVAL; + } + + v4l2_async_subdev_nf_init(&csidev->notifier, &csidev->sd); + + asd = v4l2_async_nf_add_fwnode_remote(&csidev->notifier, ep, + struct v4l2_async_connection); + + fwnode_handle_put(ep); + + if (IS_ERR(asd)) { + dev_err(csidev->dev, "Failed to add fwnode remote subdev\n"); + return PTR_ERR(asd); + } + + csidev->notifier.ops = &stm32_csi_notifier_ops; + + ret = v4l2_async_nf_register(&csidev->notifier); + if (ret) { + dev_err(csidev->dev, "Failed to register notifier\n"); + v4l2_async_nf_cleanup(&csidev->notifier); + return ret; + } + + return ret; +} + +static int stm32_csi_probe(struct platform_device *pdev) +{ + struct stm32_csi_dev *csidev; + int ret; + + csidev = devm_kzalloc(&pdev->dev, sizeof(*csidev), GFP_KERNEL); + if (!csidev) + return -ENOMEM; + + platform_set_drvdata(pdev, csidev); + csidev->dev = &pdev->dev; + + spin_lock_init(&csidev->slock); + + ret = stm32_csi_get_resources(csidev, pdev); + if (ret) + goto err_free_priv; + + ret = stm32_csi_parse_dt(csidev); + if (ret) + goto err_free_priv; + + csidev->sd.owner = THIS_MODULE; + csidev->sd.dev = &pdev->dev; + csidev->sd.internal_ops = &stm32_csi_subdev_internal_ops; + v4l2_subdev_init(&csidev->sd, &stm32_csi_subdev_ops); + v4l2_set_subdevdata(&csidev->sd, &pdev->dev); + snprintf(csidev->sd.name, sizeof(csidev->sd.name), "%s", + dev_name(&pdev->dev)); + + /* Create our media pads */ + csidev->sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE; + csidev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; + csidev->pads[STM32_CSI_PAD_SINK].flags = MEDIA_PAD_FL_SINK; + csidev->pads[STM32_CSI_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE; + + ret = media_entity_pads_init(&csidev->sd.entity, STM32_CSI_PAD_MAX, + csidev->pads); + if (ret) + goto err_cleanup; + + ret = v4l2_subdev_init_finalize(&csidev->sd); + if (ret < 0) + goto err_cleanup; + + ret = v4l2_async_register_subdev(&csidev->sd); + if (ret < 0) + goto err_cleanup; + + /* Reset device */ + ret = reset_control_assert(csidev->rstc); + if (ret) { + ret = dev_err_probe(&pdev->dev, ret, + "Failed to assert the reset line\n"); + goto err_cleanup; + } + + usleep_range(3000, 5000); + + ret = reset_control_deassert(csidev->rstc); + if (ret) { + ret = dev_err_probe(&pdev->dev, ret, + "Failed to deassert the reset line\n"); + goto err_cleanup; + } + + pm_runtime_enable(&pdev->dev); + + dev_info(&pdev->dev, + "Probed CSI with %u lanes\n", csidev->num_lanes); + + return 0; + +err_cleanup: + v4l2_async_nf_cleanup(&csidev->notifier); +err_free_priv: + return ret; +} + +static void stm32_csi_remove(struct platform_device *pdev) +{ + struct stm32_csi_dev *csidev = platform_get_drvdata(pdev); + + v4l2_async_unregister_subdev(&csidev->sd); + + pm_runtime_disable(&pdev->dev); +} + +static int stm32_csi_runtime_suspend(struct device *dev) +{ + struct stm32_csi_dev *csidev = dev_get_drvdata(dev); + int ret; + + clk_disable_unprepare(csidev->csi2phy); + clk_disable_unprepare(csidev->txesc); + clk_disable_unprepare(csidev->pclk); + + ret = regulator_bulk_disable(ARRAY_SIZE(csidev->supplies), + csidev->supplies); + if (ret < 0) + dev_err(dev, "cannot disable regulators %d\n", ret); + + return 0; +} + +static int stm32_csi_runtime_resume(struct device *dev) +{ + struct stm32_csi_dev *csidev = dev_get_drvdata(dev); + int ret; + + ret = regulator_bulk_enable(ARRAY_SIZE(csidev->supplies), + csidev->supplies); + if (ret) + goto error_out; + + ret = clk_prepare_enable(csidev->pclk); + if (ret) + goto error_disable_supplies; + + ret = clk_prepare_enable(csidev->txesc); + if (ret) + goto error_disable_pclk; + + ret = clk_prepare_enable(csidev->csi2phy); + if (ret) + goto error_disable_txesc; + + return 0; + +error_disable_txesc: + clk_disable_unprepare(csidev->txesc); +error_disable_pclk: + clk_disable_unprepare(csidev->pclk); +error_disable_supplies: + ret = regulator_bulk_disable(ARRAY_SIZE(csidev->supplies), csidev->supplies); + if (ret < 0) + dev_err(dev, "cannot disable regulators %d\n", ret); +error_out: + dev_err(csidev->dev, "Failed to resume: %d\n", ret); + + return ret; +} + +static const struct of_device_id stm32_csi_of_table[] = { + { .compatible = "st,stm32mp25-csi", }, + { /* end node */ }, +}; +MODULE_DEVICE_TABLE(of, stm32_csi_of_table); + +static const struct dev_pm_ops stm32_csi_pm_ops = { + RUNTIME_PM_OPS(stm32_csi_runtime_suspend, + stm32_csi_runtime_resume, NULL) +}; + +static struct platform_driver stm32_csi_driver = { + .driver = { + .name = "stm32-csi", + .of_match_table = stm32_csi_of_table, + .pm = pm_ptr(&stm32_csi_pm_ops), + }, + .probe = stm32_csi_probe, + .remove = stm32_csi_remove, +}; + +module_platform_driver(stm32_csi_driver); + +MODULE_AUTHOR("Alain Volmat <alain.volmat@xxxxxxxxxxx>"); +MODULE_DESCRIPTION("STM32 CSI controller"); +MODULE_LICENSE("GPL"); -- 2.25.1
