initial commit

1 files changed, 388 insertions, 0 deletions

diff --git a/recipes-kernel/linux/rvphone/cl-imx8/sn65dsi83/sn65dsi83_brg.c b/recipes-kernel/linux/rvphone/cl-imx8/sn65dsi83/sn65dsi83_brg.c
new file mode 100644
index 0000000..f4a7713
--- /dev/null
+++ b/recipes-kernel/linux/rvphone/cl-imx8/sn65dsi83/sn65dsi83_brg.c
@@ -0,0 +1,388 @@
+/*
+ * Copyright (C) 2018 CopuLab Ltd.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/i2c.h>
+#include <linux/device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_graph.h>
+#include <linux/slab.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_connector.h>
+#include <video/mipi_display.h>
+#include <video/of_videomode.h>
+#include <video/videomode.h>
+
+#include "sn65dsi83_brg.h"
+
+/* Register addresses */
+
+#define SN65DSI83_SOFT_RESET         0x09
+#define SN65DSI83_CORE_PLL           0x0A
+    #define LVDS_CLK_RANGE_SHIFT    1
+    #define HS_CLK_SRC_SHIFT        0
+
+#define SN65DSI83_PLL_DIV            0x0B
+    #define DSI_CLK_DIV_SHIFT       3
+
+#define SN65DSI83_PLL_EN             0x0D
+#define SN65DSI83_DSI_CFG            0x10
+    #define CHA_DSI_LANES_SHIFT    3
+
+#define SN65DSI83_DSI_EQ              0x11
+#define SN65DSI83_CHA_DSI_CLK_RNG     0x12
+#define SN65DSI83_CHB_DSI_CLK_RNG     0x13
+#define SN65DSI83_LVDS_MODE           0x18
+    #define DE_NEG_POLARITY_SHIFT 7
+    #define HS_NEG_POLARITY_SHIFT 6
+    #define VS_NEG_POLARITY_SHIFT 5
+    #define LVDS_LINK_CFG_SHIFT   4
+    #define CHA_24BPP_MODE_SHIFT  3
+    #define CHA_24BPP_FMT1_SHIFT  1
+
+#define SN65DSI83_LVDS_SIGN           0x19
+#define SN65DSI83_LVDS_TERM           0x1A
+#define SN65DSI83_LVDS_CM_ADJ         0x1B
+#define SN65DSI83_CHA_LINE_LEN_LO     0x20
+#define SN65DSI83_CHA_LINE_LEN_HI     0x21
+#define SN65DSI83_CHB_LINE_LEN_LO     0x22
+#define SN65DSI83_CHB_LINE_LEN_HI     0x23
+#define SN65DSI83_CHA_VERT_LINES_LO   0x24
+#define SN65DSI83_CHA_VERT_LINES_HI   0x25
+#define SN65DSI83_CHB_VERT_LINES_LO   0x26
+#define SN65DSI83_CHB_VERT_LINES_HI   0x27
+#define SN65DSI83_CHA_SYNC_DELAY_LO   0x28
+#define SN65DSI83_CHA_SYNC_DELAY_HI   0x29
+#define SN65DSI83_CHB_SYNC_DELAY_LO   0x2A
+#define SN65DSI83_CHB_SYNC_DELAY_HI   0x2B
+#define SN65DSI83_CHA_HSYNC_WIDTH_LO  0x2C
+#define SN65DSI83_CHA_HSYNC_WIDTH_HI  0x2D
+#define SN65DSI83_CHB_HSYNC_WIDTH_LO  0x2E
+#define SN65DSI83_CHB_HSYNC_WIDTH_HI  0x2F
+#define SN65DSI83_CHA_VSYNC_WIDTH_LO  0x30
+#define SN65DSI83_CHA_VSYNC_WIDTH_HI  0x31
+#define SN65DSI83_CHB_VSYNC_WIDTH_LO  0x32
+#define SN65DSI83_CHB_VSYNC_WIDTH_HI  0x33
+#define SN65DSI83_CHA_HORZ_BACKPORCH  0x34
+#define SN65DSI83_CHB_HORZ_BACKPORCH  0x35
+#define SN65DSI83_CHA_VERT_BACKPORCH  0x36
+#define SN65DSI83_CHB_VERT_BACKPORCH  0x37
+#define SN65DSI83_CHA_HORZ_FRONTPORCH 0x38
+#define SN65DSI83_CHB_HORZ_FRONTPORCH 0x39
+#define SN65DSI83_CHA_VERT_FRONTPORCH 0x3A
+#define SN65DSI83_CHB_VERT_FRONTPORCH 0x3B
+#define SN65DSI83_CHA_ERR             0xE5
+#define SN65DSI83_TEST_PATTERN        0x3C
+#define SN65DSI83_REG_3D              0x3D
+#define SN65DSI83_REG_3E              0x3E
+
+static int sn65dsi83_brg_power_on(struct sn65dsi83_brg *brg)
+{
+    dev_info(&brg->client->dev,"%s\n",__func__);
+    gpiod_set_value_cansleep(brg->gpio_enable, 1);
+    /* Wait for 1ms for the internal voltage regulator to stabilize */
+    msleep(1);
+
+    return 0;
+}
+
+static void sn65dsi83_brg_power_off(struct sn65dsi83_brg *brg)
+{
+    dev_info(&brg->client->dev,"%s\n",__func__);
+    gpiod_set_value_cansleep(brg->gpio_enable, 0);
+    /*
+     * The EN pin must be held low for at least 10 ms
+     * before being asserted high
+     */
+    msleep(10);
+}
+
+static int sn65dsi83_write(struct i2c_client *client, u8 reg, u8 val)
+{
+    int ret;
+
+    ret = i2c_smbus_write_byte_data(client, reg, val);
+
+    if (ret)
+        dev_err(&client->dev, "failed to write at 0x%02x", reg);
+
+    dev_dbg(&client->dev, "%s: write reg 0x%02x data 0x%02x", __func__, reg, val);
+
+    return ret;
+}
+#define SN65DSI83_WRITE(reg,val) sn65dsi83_write(client, (reg) , (val))
+
+static int sn65dsi83_read(struct i2c_client *client, u8 reg)
+{
+    int ret;
+
+    dev_info(&client->dev, "client 0x%p", client);
+    ret = i2c_smbus_read_byte_data(client, reg);
+
+    if (ret < 0) {
+        dev_err(&client->dev, "failed reading at 0x%02x", reg);
+        return ret;
+    }
+
+    dev_dbg(&client->dev, "%s: read reg 0x%02x data 0x%02x", __func__, reg, ret);
+
+    return ret;
+}
+#define SN65DSI83_READ(reg) sn65dsi83_read(client, (reg))
+
+static int sn65dsi83_brg_start_stream(struct sn65dsi83_brg *brg)
+{
+    int regval;
+    struct i2c_client *client = I2C_CLIENT(brg);
+
+    dev_info(&client->dev,"%s\n",__func__);
+    /* Set the PLL_EN bit (CSR 0x0D.0) */
+    SN65DSI83_WRITE(SN65DSI83_PLL_EN, 0x1);
+    /* Wait for the PLL_LOCK bit to be set (CSR 0x0A.7) */
+    msleep(200);
+
+    /* Perform SW reset to apply changes */
+    SN65DSI83_WRITE(SN65DSI83_SOFT_RESET, 0x01);
+
+    /* Read CHA Error register */
+    regval = SN65DSI83_READ(SN65DSI83_CHA_ERR);
+    dev_info(&client->dev, "CHA (0x%02x) = 0x%02x",
+         SN65DSI83_CHA_ERR, regval);
+
+    return 0;
+}
+
+static void sn65dsi83_brg_stop_stream(struct sn65dsi83_brg *brg)
+{
+    struct i2c_client *client = I2C_CLIENT(brg);
+    dev_info(&client->dev,"%s\n",__func__);
+    /* Clear the PLL_EN bit (CSR 0x0D.0) */
+    SN65DSI83_WRITE(SN65DSI83_PLL_EN, 0x00);
+}
+
+static int sn65dsi83_calk_clk_range(int min_regval, int max_regval,
+                unsigned long min_clk, unsigned long inc,
+                unsigned long target_clk)
+{
+    int regval = min_regval;
+    unsigned long clk = min_clk;
+
+    while (regval <= max_regval) {
+        if ((clk <= target_clk) && (target_clk < (clk + inc)))
+            return regval;
+
+        regval++;
+        clk += inc;
+    }
+
+    return -1;
+}
+
+#define ABS(X) ((X) < 0 ? (-1 * (X)) : (X))
+static int sn65dsi83_calk_div(int min_regval, int max_regval, int min_div,
+                int inc, unsigned long source_clk,
+                unsigned long target_clk)
+{
+    int regval = min_regval;
+    int div = min_div;
+    unsigned long curr_delta;
+    unsigned long prev_delta = ABS(DIV_ROUND_UP(source_clk, div) -
+                    target_clk);
+
+    while (regval <= max_regval) {
+        curr_delta = ABS(DIV_ROUND_UP(source_clk, div) - target_clk);
+        if (curr_delta > prev_delta)
+            return --regval;
+
+        regval++;
+        div += inc;
+    }
+
+    return -1;
+}
+
+static int sn65dsi83_brg_configure(struct sn65dsi83_brg *brg)
+{
+    int regval = 0;
+    struct i2c_client *client = I2C_CLIENT(brg);
+    struct videomode *vm = VM(brg);
+
+    u32 dsi_clk = (((PIXCLK * BPP(brg)) / DSI_LANES(brg)) >> 1);
+
+    dev_info(&client->dev, "DSI clock [ %u ] Hz\n",dsi_clk);
+    dev_info(&client->dev, "GeoMetry [ %d x %d ] Hz\n",HACTIVE,VACTIVE);
+
+    /* Reset PLL_EN and SOFT_RESET registers */
+    SN65DSI83_WRITE(SN65DSI83_SOFT_RESET,0x00);
+    SN65DSI83_WRITE(SN65DSI83_PLL_EN,0x00);
+
+    /* LVDS clock setup */
+    if  ((25000000 <= PIXCLK) && (PIXCLK < 37500000))
+        regval = 0;
+    else
+        regval = sn65dsi83_calk_clk_range(0x01, 0x05, 37500000, 25000000,
+                    PIXCLK);
+
+    if (regval < 0) {
+        dev_err(&client->dev, "failed to configure LVDS clock");
+        return -EINVAL;
+    }
+
+    regval = (regval << LVDS_CLK_RANGE_SHIFT);
+    regval |= (1 << HS_CLK_SRC_SHIFT); /* Use DSI clock */
+    SN65DSI83_WRITE(SN65DSI83_CORE_PLL,regval);
+
+    /* DSI clock range */
+    regval = sn65dsi83_calk_clk_range(0x08, 0x64, 40000000, 5000000, dsi_clk);
+    if (regval < 0) {
+        dev_err(&client->dev, "failed to configure DSI clock range\n");
+        return -EINVAL;
+    }
+    SN65DSI83_WRITE(SN65DSI83_CHA_DSI_CLK_RNG,regval);
+
+    /* DSI clock divider */
+    regval = sn65dsi83_calk_div(0x0, 0x18, 1, 1, dsi_clk, PIXCLK);
+    if (regval < 0) {
+        dev_err(&client->dev, "failed to calculate DSI clock divider");
+        return -EINVAL;
+    }
+
+    regval = regval << DSI_CLK_DIV_SHIFT;
+    SN65DSI83_WRITE(SN65DSI83_PLL_DIV,regval);
+
+    /* Configure DSI_LANES  */
+    regval = SN65DSI83_READ(SN65DSI83_DSI_CFG);
+    regval &= ~(3 << CHA_DSI_LANES_SHIFT);
+    regval |= ((4 - DSI_LANES(brg)) << CHA_DSI_LANES_SHIFT);
+    SN65DSI83_WRITE(SN65DSI83_DSI_CFG,regval);
+
+    /* CHA_DSI_DATA_EQ - No Equalization */
+    /* CHA_DSI_CLK_EQ  - No Equalization */
+    SN65DSI83_WRITE(SN65DSI83_DSI_EQ,0x00);
+
+    /* Video formats */
+    regval = 0;
+    if (FLAGS & DISPLAY_FLAGS_HSYNC_LOW)
+        regval |= (1 << HS_NEG_POLARITY_SHIFT);
+
+    if (FLAGS & DISPLAY_FLAGS_VSYNC_LOW)
+        regval |= (1 << VS_NEG_POLARITY_SHIFT);
+
+    if (FLAGS & DISPLAY_FLAGS_DE_LOW)
+        regval |= (1 << DE_NEG_POLARITY_SHIFT);
+
+    if (BPP(brg) == 24)
+        regval |= (1 << CHA_24BPP_MODE_SHIFT);
+
+    if (FORMAT(brg) == 1)
+        regval |= (1 << CHA_24BPP_FMT1_SHIFT);
+
+    regval |= (1 << LVDS_LINK_CFG_SHIFT);
+    SN65DSI83_WRITE(SN65DSI83_LVDS_MODE,regval);
+
+    /* Voltage and pins */
+    SN65DSI83_WRITE(SN65DSI83_LVDS_SIGN,0x00);
+    SN65DSI83_WRITE(SN65DSI83_LVDS_TERM,0x03);
+    SN65DSI83_WRITE(SN65DSI83_LVDS_CM_ADJ,0x00);
+
+    /* Configure sync delay to minimal allowed value */
+    SN65DSI83_WRITE(SN65DSI83_CHA_SYNC_DELAY_LO,0x21);
+    SN65DSI83_WRITE(SN65DSI83_CHA_SYNC_DELAY_HI,0x00);
+
+    /* Geometry */
+    SN65DSI83_WRITE(SN65DSI83_CHA_LINE_LEN_LO,LOW(HACTIVE));
+    SN65DSI83_WRITE(SN65DSI83_CHA_LINE_LEN_HI,HIGH(HACTIVE));
+
+    SN65DSI83_WRITE(SN65DSI83_CHA_VERT_LINES_LO,LOW(VACTIVE));
+    SN65DSI83_WRITE(SN65DSI83_CHA_VERT_LINES_HI,HIGH(VACTIVE));
+
+    SN65DSI83_WRITE(SN65DSI83_CHA_HSYNC_WIDTH_LO,LOW(HPW));
+    SN65DSI83_WRITE(SN65DSI83_CHA_HSYNC_WIDTH_HI,HIGH(HPW));
+
+    SN65DSI83_WRITE(SN65DSI83_CHA_VSYNC_WIDTH_LO,LOW(VPW));
+    SN65DSI83_WRITE(SN65DSI83_CHA_VSYNC_WIDTH_HI,HIGH(VPW));
+
+    SN65DSI83_WRITE(SN65DSI83_CHA_HORZ_BACKPORCH,LOW(HBP));
+    SN65DSI83_WRITE(SN65DSI83_CHA_VERT_BACKPORCH,LOW(VBP));
+
+    SN65DSI83_WRITE(SN65DSI83_CHA_HORZ_FRONTPORCH,LOW(HFP));
+    SN65DSI83_WRITE(SN65DSI83_CHA_VERT_FRONTPORCH,LOW(VFP));
+
+    SN65DSI83_WRITE(SN65DSI83_TEST_PATTERN,0x00);
+    SN65DSI83_WRITE(SN65DSI83_REG_3D,0x00);
+    SN65DSI83_WRITE(SN65DSI83_REG_3E,0x00);
+
+    /* mute channel B */
+    SN65DSI83_WRITE(SN65DSI83_CHB_DSI_CLK_RNG, 0x00);
+    SN65DSI83_WRITE(SN65DSI83_CHB_LINE_LEN_LO, 0x00);
+    SN65DSI83_WRITE(SN65DSI83_CHB_LINE_LEN_HI, 0x00);
+    SN65DSI83_WRITE(SN65DSI83_CHB_VERT_LINES_LO, 0x00);
+    SN65DSI83_WRITE(SN65DSI83_CHB_VERT_LINES_HI, 0x00);
+    SN65DSI83_WRITE(SN65DSI83_CHB_SYNC_DELAY_LO, 0x00);
+    SN65DSI83_WRITE(SN65DSI83_CHB_SYNC_DELAY_HI, 0x00);
+    SN65DSI83_WRITE(SN65DSI83_CHB_HSYNC_WIDTH_LO, 0x00);
+    SN65DSI83_WRITE(SN65DSI83_CHB_HSYNC_WIDTH_HI, 0x00);
+    SN65DSI83_WRITE(SN65DSI83_CHB_VSYNC_WIDTH_LO, 0x00);
+    SN65DSI83_WRITE(SN65DSI83_CHB_VSYNC_WIDTH_HI, 0x00);
+    SN65DSI83_WRITE(SN65DSI83_CHB_HORZ_BACKPORCH, 0x00);
+    SN65DSI83_WRITE(SN65DSI83_CHB_VERT_BACKPORCH, 0x00);
+    SN65DSI83_WRITE(SN65DSI83_CHB_HORZ_FRONTPORCH, 0x00);
+    SN65DSI83_WRITE(SN65DSI83_CHB_VERT_FRONTPORCH, 0x00);
+    return 0;
+}
+
+static int sn65dsi83_brg_setup(struct sn65dsi83_brg *brg)
+{
+    struct i2c_client *client = I2C_CLIENT(brg);
+    dev_info(&client->dev,"%s\n",__func__);
+    sn65dsi83_brg_power_on(brg);
+    return sn65dsi83_brg_configure(brg);
+}
+
+static int sn65dsi83_brg_reset(struct sn65dsi83_brg *brg)
+{
+    /* Soft Reset reg value at power on should be 0x00 */
+    struct i2c_client *client = I2C_CLIENT(brg);
+    int ret = SN65DSI83_READ(SN65DSI83_SOFT_RESET);
+    dev_info(&client->dev,"%s\n",__func__);
+    if (ret != 0x00) {
+        dev_err(&client->dev,"Failed to reset the device");
+        return -ENODEV;
+    }
+    return 0;
+}
+
+static struct sn65dsi83_brg_funcs brg_func = {
+    .power_on = sn65dsi83_brg_power_on,
+    .power_off = sn65dsi83_brg_power_off,
+    .setup = sn65dsi83_brg_setup,
+    .reset = sn65dsi83_brg_reset,
+    .start_stream = sn65dsi83_brg_start_stream,
+    .stop_stream = sn65dsi83_brg_stop_stream,
+};
+
+static struct sn65dsi83_brg brg = {
+    .funcs = &brg_func,
+};
+
+struct sn65dsi83_brg *sn65dsi83_brg_get(void) {
+    return &brg;
+}