/* * Novena video output support * * IT6251 code based on code Copyright (C) 2014 Sean Cross * from https://github.com/xobs/novena-linux.git commit * 3d85836ee1377d445531928361809612aa0a18db * * Copyright (C) 2014 Marek Vasut * * SPDX-License-Identifier: GPL-2.0+ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "novena.h" #define IT6251_VENDOR_ID_LOW 0x00 #define IT6251_VENDOR_ID_HIGH 0x01 #define IT6251_DEVICE_ID_LOW 0x02 #define IT6251_DEVICE_ID_HIGH 0x03 #define IT6251_SYSTEM_STATUS 0x0d #define IT6251_SYSTEM_STATUS_RINTSTATUS (1 << 0) #define IT6251_SYSTEM_STATUS_RHPDSTATUS (1 << 1) #define IT6251_SYSTEM_STATUS_RVIDEOSTABLE (1 << 2) #define IT6251_SYSTEM_STATUS_RPLL_IOLOCK (1 << 3) #define IT6251_SYSTEM_STATUS_RPLL_XPLOCK (1 << 4) #define IT6251_SYSTEM_STATUS_RPLL_SPLOCK (1 << 5) #define IT6251_SYSTEM_STATUS_RAUXFREQ_LOCK (1 << 6) #define IT6251_REF_STATE 0x0e #define IT6251_REF_STATE_MAIN_LINK_DISABLED (1 << 0) #define IT6251_REF_STATE_AUX_CHANNEL_READ (1 << 1) #define IT6251_REF_STATE_CR_PATTERN (1 << 2) #define IT6251_REF_STATE_EQ_PATTERN (1 << 3) #define IT6251_REF_STATE_NORMAL_OPERATION (1 << 4) #define IT6251_REF_STATE_MUTED (1 << 5) #define IT6251_REG_PCLK_CNT_LOW 0x57 #define IT6251_REG_PCLK_CNT_HIGH 0x58 #define IT6521_RETRY_MAX 20 static int it6251_is_stable(void) { const unsigned int caddr = NOVENA_IT6251_CHIPADDR; const unsigned int laddr = NOVENA_IT6251_LVDSADDR; int status; int clkcnt; int rpclkcnt; int refstate; rpclkcnt = (i2c_reg_read(caddr, 0x13) & 0xff) | ((i2c_reg_read(caddr, 0x14) << 8) & 0x0f00); debug("RPCLKCnt: %d\n", rpclkcnt); status = i2c_reg_read(caddr, IT6251_SYSTEM_STATUS); debug("System status: 0x%02x\n", status); clkcnt = (i2c_reg_read(laddr, IT6251_REG_PCLK_CNT_LOW) & 0xff) | ((i2c_reg_read(laddr, IT6251_REG_PCLK_CNT_HIGH) << 8) & 0x0f00); debug("Clock: 0x%02x\n", clkcnt); refstate = i2c_reg_read(laddr, IT6251_REF_STATE); debug("Ref Link State: 0x%02x\n", refstate); if ((refstate & 0x1f) != 0) return 0; /* If video is muted, that's a failure */ if (refstate & IT6251_REF_STATE_MUTED) return 0; if (!(status & IT6251_SYSTEM_STATUS_RVIDEOSTABLE)) return 0; return 1; } static int it6251_ready(void) { const unsigned int caddr = NOVENA_IT6251_CHIPADDR; /* Test if the IT6251 came out of reset by reading ID regs. */ if (i2c_reg_read(caddr, IT6251_VENDOR_ID_LOW) != 0x15) return 0; if (i2c_reg_read(caddr, IT6251_VENDOR_ID_HIGH) != 0xca) return 0; if (i2c_reg_read(caddr, IT6251_DEVICE_ID_LOW) != 0x51) return 0; if (i2c_reg_read(caddr, IT6251_DEVICE_ID_HIGH) != 0x62) return 0; return 1; } static void it6251_program_regs(void) { const unsigned int caddr = NOVENA_IT6251_CHIPADDR; const unsigned int laddr = NOVENA_IT6251_LVDSADDR; i2c_reg_write(caddr, 0x05, 0x00); mdelay(1); /* set LVDSRX address, and enable */ i2c_reg_write(caddr, 0xfd, 0xbc); i2c_reg_write(caddr, 0xfe, 0x01); /* * LVDSRX */ /* This write always fails, because the chip goes into reset */ /* reset LVDSRX */ i2c_reg_write(laddr, 0x05, 0xff); i2c_reg_write(laddr, 0x05, 0x00); /* reset LVDSRX PLL */ i2c_reg_write(laddr, 0x3b, 0x42); i2c_reg_write(laddr, 0x3b, 0x43); /* something with SSC PLL */ i2c_reg_write(laddr, 0x3c, 0x08); /* don't swap links, but writing reserved registers */ i2c_reg_write(laddr, 0x0b, 0x88); /* JEIDA, 8-bit depth 0x11, orig 0x42 */ i2c_reg_write(laddr, 0x2c, 0x01); /* "reserved" */ i2c_reg_write(laddr, 0x32, 0x04); /* "reserved" */ i2c_reg_write(laddr, 0x35, 0xe0); /* "reserved" + clock delay */ i2c_reg_write(laddr, 0x2b, 0x24); /* reset LVDSRX pix clock */ i2c_reg_write(laddr, 0x05, 0x02); i2c_reg_write(laddr, 0x05, 0x00); /* * DPTX */ /* set for two lane mode, normal op, no swapping, no downspread */ i2c_reg_write(caddr, 0x16, 0x02); /* some AUX channel EDID magic */ i2c_reg_write(caddr, 0x23, 0x40); /* power down lanes 3-0 */ i2c_reg_write(caddr, 0x5c, 0xf3); /* enable DP scrambling, change EQ CR phase */ i2c_reg_write(caddr, 0x5f, 0x06); /* color mode RGB, pclk/2 */ i2c_reg_write(caddr, 0x60, 0x02); /* dual pixel input mode, no EO swap, no RGB swap */ i2c_reg_write(caddr, 0x61, 0x04); /* M444B24 video format */ i2c_reg_write(caddr, 0x62, 0x01); /* vesa range / not interlace / vsync high / hsync high */ i2c_reg_write(caddr, 0xa0, 0x0F); /* hpd event timer set to 1.6-ish ms */ i2c_reg_write(caddr, 0xc9, 0xf5); /* more reserved magic */ i2c_reg_write(caddr, 0xca, 0x4d); i2c_reg_write(caddr, 0xcb, 0x37); /* enhanced framing mode, auto video fifo reset, video mute disable */ i2c_reg_write(caddr, 0xd3, 0x03); /* "vidstmp" and some reserved stuff */ i2c_reg_write(caddr, 0xd4, 0x45); /* queue number -- reserved */ i2c_reg_write(caddr, 0xe7, 0xa0); /* info frame packets and reserved */ i2c_reg_write(caddr, 0xe8, 0x33); /* more AVI stuff */ i2c_reg_write(caddr, 0xec, 0x00); /* select PC master reg for aux channel? */ i2c_reg_write(caddr, 0x23, 0x42); /* send PC request commands */ i2c_reg_write(caddr, 0x24, 0x00); i2c_reg_write(caddr, 0x25, 0x00); i2c_reg_write(caddr, 0x26, 0x00); /* native aux read */ i2c_reg_write(caddr, 0x2b, 0x00); /* back to internal */ i2c_reg_write(caddr, 0x23, 0x40); /* voltage swing level 3 */ i2c_reg_write(caddr, 0x19, 0xff); /* pre-emphasis level 3 */ i2c_reg_write(caddr, 0x1a, 0xff); /* start link training */ i2c_reg_write(caddr, 0x17, 0x01); } static int it6251_init(void) { const unsigned int caddr = NOVENA_IT6251_CHIPADDR; int reg; int tries, retries = 0; for (retries = 0; retries < IT6521_RETRY_MAX; retries++) { /* Program the chip. */ it6251_program_regs(); /* Wait for video stable. */ for (tries = 0; tries < 100; tries++) { reg = i2c_reg_read(caddr, 0x17); /* Test Link CFG, STS, LCS read done. */ if ((reg & 0xe0) != 0xe0) { /* Not yet, wait a bit more. */ mdelay(2); continue; } /* Test if the video input is stable. */ if (it6251_is_stable()) return 0; } /* * If we couldn't stabilize, requeue and try again, * because it means that the LVDS channel isn't * stable yet. */ printf("Display didn't stabilize.\n"); printf("This may be because the LVDS port is still in powersave mode.\n"); mdelay(50); } return -EINVAL; } static void enable_hdmi(struct display_info_t const *dev) { imx_enable_hdmi_phy(); } static int lvds_enabled; static void enable_lvds(struct display_info_t const *dev) { if (lvds_enabled) return; /* ITE IT6251 power enable. */ gpio_direction_output(NOVENA_ITE6251_PWR_GPIO, 0); mdelay(10); gpio_direction_output(NOVENA_ITE6251_PWR_GPIO, 1); mdelay(20); lvds_enabled = 1; } static int detect_lvds(struct display_info_t const *dev) { int ret, loops = 250; enable_lvds(dev); ret = i2c_set_bus_num(NOVENA_IT6251_I2C_BUS); if (ret) { puts("Cannot select IT6251 I2C bus.\n"); return 0; } /* Wait up-to ~250 mS for the LVDS to come up. */ while (--loops) { ret = it6251_ready(); if (ret) return ret; mdelay(1); } return 0; } struct display_info_t const displays[] = { { /* HDMI Output */ .bus = -1, .addr = 0, .pixfmt = IPU_PIX_FMT_RGB24, .detect = detect_hdmi, .enable = enable_hdmi, .mode = { .name = "HDMI", .refresh = 60, .xres = 1024, .yres = 768, .pixclock = 15384, .left_margin = 220, .right_margin = 40, .upper_margin = 21, .lower_margin = 7, .hsync_len = 60, .vsync_len = 10, .sync = FB_SYNC_EXT, .vmode = FB_VMODE_NONINTERLACED }, }, { /* LVDS Output: N133HSE-EA1 Rev. C1 */ .bus = -1, .pixfmt = IPU_PIX_FMT_RGB24, .detect = detect_lvds, .enable = enable_lvds, .mode = { .name = "Chimei-FHD", .refresh = 60, .xres = 1920, .yres = 1080, .pixclock = 15384, .left_margin = 148, .right_margin = 88, .upper_margin = 36, .lower_margin = 4, .hsync_len = 44, .vsync_len = 5, .sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT | FB_SYNC_EXT, .vmode = FB_VMODE_NONINTERLACED, }, }, }; size_t display_count = ARRAY_SIZE(displays); static void enable_vpll(void) { struct mxc_ccm_reg *ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR; int timeout = 100000; setbits_le32(&ccm->analog_pll_video, BM_ANADIG_PLL_VIDEO_POWERDOWN); clrsetbits_le32(&ccm->analog_pll_video, BM_ANADIG_PLL_VIDEO_DIV_SELECT | BM_ANADIG_PLL_VIDEO_POST_DIV_SELECT, BF_ANADIG_PLL_VIDEO_DIV_SELECT(37) | BF_ANADIG_PLL_VIDEO_POST_DIV_SELECT(1)); writel(BF_ANADIG_PLL_VIDEO_NUM_A(11), &ccm->analog_pll_video_num); writel(BF_ANADIG_PLL_VIDEO_DENOM_B(12), &ccm->analog_pll_video_denom); clrbits_le32(&ccm->analog_pll_video, BM_ANADIG_PLL_VIDEO_POWERDOWN); while (timeout--) if (readl(&ccm->analog_pll_video) & BM_ANADIG_PLL_VIDEO_LOCK) break; if (timeout < 0) printf("Warning: video pll lock timeout!\n"); clrsetbits_le32(&ccm->analog_pll_video, BM_ANADIG_PLL_VIDEO_BYPASS, BM_ANADIG_PLL_VIDEO_ENABLE); } void setup_display_clock(void) { struct mxc_ccm_reg *mxc_ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR; struct iomuxc *iomux = (struct iomuxc *)IOMUXC_BASE_ADDR; enable_ipu_clock(); enable_vpll(); imx_setup_hdmi(); /* Turn on IPU LDB DI0 clocks */ setbits_le32(&mxc_ccm->CCGR3, MXC_CCM_CCGR3_LDB_DI0_MASK); /* Switch LDB DI0 to PLL5 (Video PLL) */ clrsetbits_le32(&mxc_ccm->cs2cdr, MXC_CCM_CS2CDR_LDB_DI0_CLK_SEL_MASK, (0 << MXC_CCM_CS2CDR_LDB_DI0_CLK_SEL_OFFSET)); /* LDB clock div by 3.5 */ clrbits_le32(&mxc_ccm->cscmr2, MXC_CCM_CSCMR2_LDB_DI0_IPU_DIV); /* DI0 clock derived from ldb_di0_clk */ clrsetbits_le32(&mxc_ccm->chsccdr, MXC_CCM_CHSCCDR_IPU1_DI0_CLK_SEL_MASK, (CHSCCDR_CLK_SEL_LDB_DI0 << MXC_CCM_CHSCCDR_IPU1_DI0_CLK_SEL_OFFSET) ); /* Enable both LVDS channels, both connected to DI0. */ writel(IOMUXC_GPR2_DI0_VS_POLARITY_ACTIVE_HIGH | IOMUXC_GPR2_BIT_MAPPING_CH1_JEIDA | IOMUXC_GPR2_DATA_WIDTH_CH1_24BIT | IOMUXC_GPR2_BIT_MAPPING_CH0_JEIDA | IOMUXC_GPR2_DATA_WIDTH_CH0_24BIT | IOMUXC_GPR2_SPLIT_MODE_EN_MASK | IOMUXC_GPR2_LVDS_CH1_MODE_ENABLED_DI0 | IOMUXC_GPR2_LVDS_CH0_MODE_ENABLED_DI0, &iomux->gpr[2]); clrsetbits_le32(&iomux->gpr[3], IOMUXC_GPR3_LVDS0_MUX_CTL_MASK | IOMUXC_GPR3_LVDS1_MUX_CTL_MASK, (IOMUXC_GPR3_MUX_SRC_IPU1_DI0 << IOMUXC_GPR3_LVDS0_MUX_CTL_OFFSET) | (IOMUXC_GPR3_MUX_SRC_IPU1_DI0 << IOMUXC_GPR3_LVDS1_MUX_CTL_OFFSET) ); } void setup_display_lvds(void) { int ret; ret = i2c_set_bus_num(NOVENA_IT6251_I2C_BUS); if (ret) { puts("Cannot select LVDS-to-eDP I2C bus.\n"); return; } /* The IT6251 should be ready now, if it's not, it's not connected. */ ret = it6251_ready(); if (!ret) return; /* Init the LVDS-to-eDP chip and if it succeeded, enable backlight. */ ret = it6251_init(); if (!ret) { /* Backlight power enable. */ gpio_direction_output(NOVENA_BACKLIGHT_PWR_GPIO, 1); /* PWM backlight pin, always on for full brightness. */ gpio_direction_output(NOVENA_BACKLIGHT_PWM_GPIO, 1); } }