From: Mythri P K <mythripk@xxxxxx> picodlp_i2c_client needs to send commands over i2c as a part of initialiazation. system controller dlp pico processor dpp2600 is used. It configures the splash screen of picodlp using a sequence of commands. A programmer's guide is available at: http://focus.ti.com/lit/ug/dlpu002a/dlpu002a.pdf API is defined for sending command over i2c as an i2c_write operation. Signed-off-by: Mythri P K <mythripk@xxxxxx> Signed-off-by: Mayuresh Janorkar <mayur@xxxxxx> --- Changes since v1: 1. Removed initial splash screen 2. i2c_commands regrouped 3. Removed long msleep 4. Added try-after-sleep in i2c_write drivers/video/omap2/displays/panel-picodlp.c | 212 ++++++++++++++++++++++++++ 1 files changed, 212 insertions(+), 0 deletions(-) diff --git a/drivers/video/omap2/displays/panel-picodlp.c b/drivers/video/omap2/displays/panel-picodlp.c index fdbfdcf..493a411 100644 --- a/drivers/video/omap2/displays/panel-picodlp.c +++ b/drivers/video/omap2/displays/panel-picodlp.c @@ -32,7 +32,15 @@ #include <plat/display.h> #include <plat/panel-picodlp.h> +#include "panel-picodlp.h" + #define DRIVER_NAME "picodlp_i2c_driver" + +/* This defines the minit of data which is allowed into single write block */ +#define MAX_I2C_WRITE_BLOCK_SIZE 32 +#define PICO_MAJOR 1 /* 2 bits */ +#define PICO_MINOR 1 /* 2 bits */ + struct picodlp_data { struct mutex lock; struct i2c_client *picodlp_i2c_client; @@ -50,6 +58,11 @@ struct i2c_device_id picodlp_i2c_id[] = { { "picodlp_i2c_driver", 0 }, }; +struct picodlp_i2c_command { + u8 reg; + u32 value; +}; + static struct omap_video_timings pico_ls_timings = { .x_res = 864, .y_res = 480, @@ -70,6 +83,197 @@ static inline struct picodlp_panel_data return (struct picodlp_panel_data *) dssdev->data; } +static int picodlp_i2c_write_block(struct i2c_client *client, + u8 *data, int len) +{ + struct i2c_msg msg; + int i, r, msg_count = 1, trial = 4; + + struct picodlp_i2c_data *picodlp_i2c_data = i2c_get_clientdata(client); + + if (len < 1 || len > MAX_I2C_WRITE_BLOCK_SIZE) { + dev_err(&client->dev, + "too long syn_write_block len %d\n", len); + return -EIO; + } +retry: + mutex_lock(&picodlp_i2c_data->xfer_lock); + + msg.addr = client->addr; + msg.flags = 0; + msg.len = len; + msg.buf = data; + r = i2c_transfer(client->adapter, &msg, msg_count); + mutex_unlock(&picodlp_i2c_data->xfer_lock); + + /* + * i2c_transfer returns: + * number of messages sent in case of success + * a negative error number in case of failure + * i2c controller might timeout, in such a case sleep for sometime + * and then retry + */ + if (r != msg_count) { + msleep(2); + if (trial--) + goto retry; + + dev_err(&client->dev, " picodlp_i2c_write error\n"); + return r; + } + + /* In case of success */ + for (i = 0; i < len; i++) + dev_dbg(&client->dev, + "addr %x bw 0x%02x[%d]: 0x%02x\n", + client->addr, data[0] + i, i, data[i]); + + return 0; +} + +static int picodlp_i2c_write(struct i2c_client *client, u8 reg, u32 value) +{ + u8 data[5]; + int i; + + data[0] = reg; + for (i = 1; i < 5; i++) + data[i] = (value >> (32 - (i) * 8)) & 0xFF; + + return picodlp_i2c_write_block(client, data, 5); +} + +static int picodlp_i2c_write_array(struct i2c_client *client, + const struct picodlp_i2c_command commands[], + int count) +{ + int i, r = 0; + for (i = 0; i < count; i++) { + r = picodlp_i2c_write(client, commands[i].reg, + commands[i].value); + if (r) + return r; + } + return r; +} +/** + * picodlp_i2c_init: i2c_initialization routine + * client: i2c_client for communication + * + * @return + * 0 : Success, no error + * error code : Failure + */ +static int picodlp_i2c_init(struct i2c_client *client) +{ + int r; + static const struct picodlp_i2c_command init_cmd_set1[] = { + {SOFT_RESET, 1}, + {DMD_PARK_TRIGGER, 1}, + {MISC_REG, (PICO_MAJOR << 2 | PICO_MINOR)}, + {SEQ_CONTROL, 0}, + {SEQ_VECTOR, 0x100}, + {DMD_BLOCK_COUNT, 7}, + {DMD_VCC_CONTROL, 0x109}, + {DMD_PARK_PULSE_COUNT, 0xA}, + {DMD_PARK_PULSE_WIDTH, 0xB}, + {DMD_PARK_DELAY, 0x2ED}, + {DMD_SHADOW_ENABLE, 0}, + {FLASH_OPCODE, 0xB}, + {FLASH_DUMMY_BYTES, 1}, + {FLASH_ADDR_BYTES, 3}, + {PBC_CONTROL, 0}, + {FLASH_START_ADDR, CMT_LUT_0_START_ADDR}, + {FLASH_READ_BYTES, CMT_LUT_0_SIZE}, + {CMT_SPLASH_LUT_START_ADDR, 0}, + {CMT_SPLASH_LUT_DEST_SELECT, CMT_LUT_ALL}, + {PBC_CONTROL, 1}, + }; + + static const struct picodlp_i2c_command init_cmd_set2[] = { + {PBC_CONTROL, 0}, + {CMT_SPLASH_LUT_DEST_SELECT, 0}, + {PBC_CONTROL, 0}, + {FLASH_START_ADDR, SEQUENCE_0_START_ADDR}, + {FLASH_READ_BYTES, SEQUENCE_0_SIZE}, + {SEQ_RESET_LUT_START_ADDR, 0}, + {SEQ_RESET_LUT_DEST_SELECT, SEQ_SEQ_LUT}, + {PBC_CONTROL, 1}, + }; + + static const struct picodlp_i2c_command init_cmd_set3[] = { + {PBC_CONTROL, 0}, + {SEQ_RESET_LUT_DEST_SELECT, 0}, + {PBC_CONTROL, 0}, + {FLASH_START_ADDR, DRC_TABLE_0_START_ADDR}, + {FLASH_READ_BYTES, DRC_TABLE_0_SIZE}, + {SEQ_RESET_LUT_START_ADDR, 0}, + {SEQ_RESET_LUT_DEST_SELECT, SEQ_DRC_LUT_ALL}, + {PBC_CONTROL, 1}, + }; + + static const struct picodlp_i2c_command init_cmd_set4[] = { + {PBC_CONTROL, 0}, + {SEQ_RESET_LUT_DEST_SELECT, 0}, + {SDC_ENABLE, 1}, + {AGC_CTRL, 7}, + {CCA_C1A, 0x100}, + {CCA_C1B, 0x0}, + {CCA_C1C, 0x0}, + {CCA_C2A, 0x0}, + {CCA_C2B, 0x100}, + {CCA_C2C, 0x0}, + {CCA_C3A, 0x0}, + {CCA_C3B, 0x0}, + {CCA_C3C, 0x100}, + {CCA_C7A, 0x100}, + {CCA_C7B, 0x100}, + {CCA_C7C, 0x100}, + {CCA_ENABLE, 1}, + {CPU_IF_MODE, 1}, + {SHORT_FLIP, 1}, + {CURTAIN_CONTROL, 0}, + {DMD_PARK_TRIGGER, 0}, + {R_DRIVE_CURRENT, 0x298}, + {G_DRIVE_CURRENT, 0x298}, + {B_DRIVE_CURRENT, 0x298}, + {RGB_DRIVER_ENABLE, 7}, + {SEQ_CONTROL, 0}, + {ACTGEN_CONTROL, 0x10}, + {SEQUENCE_MODE, SEQ_LOCK}, + {DATA_FORMAT, RGB888}, + {INPUT_RESOLUTION, WVGA_864_LANDSCAPE}, + {INPUT_SOURCE, PARALLEL_RGB}, + {CPU_IF_SYNC_METHOD, 1}, + {SEQ_CONTROL, 1} + }; + + r = picodlp_i2c_write_array(client, init_cmd_set1, + ARRAY_SIZE(init_cmd_set1)); + if (r) + return r; + msleep(2); + + r = picodlp_i2c_write_array(client, init_cmd_set2, + ARRAY_SIZE(init_cmd_set2)); + if (r) + return r; + msleep(2); + + r = picodlp_i2c_write_array(client, init_cmd_set3, + ARRAY_SIZE(init_cmd_set3)); + if (r) + return r; + msleep(2); + + r = picodlp_i2c_write_array(client, init_cmd_set4, + ARRAY_SIZE(init_cmd_set4)); + if (r) + return r; + + return 0; +} + static int picodlp_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id) { @@ -109,6 +313,7 @@ static int picodlp_panel_power_on(struct omap_dss_device *dssdev) int r = 0; struct picodlp_data *picod = dev_get_drvdata(&dssdev->dev); struct picodlp_panel_data *picodlp_pdata; + struct picodlp_i2c_data *picodlp_i2c_data; picodlp_pdata = get_panel_data(dssdev); gpio_set_value(picodlp_pdata->display_sel_gpio, 1); @@ -128,6 +333,13 @@ static int picodlp_panel_power_on(struct omap_dss_device *dssdev) } dssdev->state = OMAP_DSS_DISPLAY_ACTIVE; + picodlp_i2c_data = + i2c_get_clientdata(picod->picodlp_i2c_client); + + r = picodlp_i2c_init(picod->picodlp_i2c_client); + if (r) + goto err; + return r; err: if (dssdev->platform_disable) -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
