panel.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <console/console.h>
#include <delay.h>
#include <mipi/panel.h>
 
enum cb_err mipi_panel_parse_init_commands(const void *buf, mipi_cmd_func_t cmd_func)
{
        const struct panel_init_command *init = buf;
        enum mipi_dsi_transaction type;
 
        /*
         * The given commands should be in a buffer containing a packed array of
         * panel_init_command and each element may be in variable size so we have
         * to parse and scan.
         */
 
        for (; init->cmd != PANEL_CMD_END; init = (const void *)buf) {
                /*
                 * For some commands like DELAY, the init->len should not be
                 * counted for buf.
                 */
                buf += sizeof(*init);
 
                u32 cmd = init->cmd, len = init->len;
 
                if (cmd == PANEL_CMD_DELAY) {
                        mdelay(len);
                        continue;
                }
 
                switch (cmd) {
                case PANEL_CMD_DCS:
                        switch (len) {
                        case 0:
                                printk(BIOS_ERR, "%s: DCS command length 0?\n", __func__);
                                return CB_ERR;
                        case 1:
                                type = MIPI_DSI_DCS_SHORT_WRITE;
                                break;
                        case 2:
                                type = MIPI_DSI_DCS_SHORT_WRITE_PARAM;
                                break;
                        default:
                                type = MIPI_DSI_DCS_LONG_WRITE;
                                break;
                        }
                        break;
                case PANEL_CMD_GENERIC:
                        switch (len) {
                        case 0:
                                type = MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM;
                                break;
                        case 1:
                                type = MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM;
                                break;
                        case 2:
                                type = MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM;
                                break;
                        default:
                                type = MIPI_DSI_GENERIC_LONG_WRITE;
                                break;
                        }
                        break;
                default:
                        printk(BIOS_ERR, "%s: Unknown command code: %d, "
                               "abort panel initialization.\n", __func__, cmd);
                        return CB_ERR;
                }
 
                enum cb_err ret = cmd_func(type, init->data, len);
                if (ret != CB_SUCCESS)
                        return ret;
                buf += len;
        }
 
        return CB_SUCCESS;
}