phy_mipi_dphy_get_default_config

/*
 * Minimum D-PHY timings based on MIPI D-PHY specification. Derived
 * from the valid ranges specified in Section 6.9, Table 14, Page 41
 * of the D-PHY specification (v2.1).
 */
int phy_mipi_dphy_get_default_config(unsigned long pixel_clock,
                     unsigned int bpp,
                     unsigned int lanes,
                     struct phy_configure_opts_mipi_dphy *cfg)
{
    unsigned long long hs_clk_rate;
    unsigned long long ui;

    if (!cfg)
        return -EINVAL;

    hs_clk_rate = pixel_clock * bpp;
    do_div(hs_clk_rate, lanes);

    ui = ALIGN(PSEC_PER_SEC, hs_clk_rate);
    do_div(ui, hs_clk_rate);

    cfg->clk_miss = 0;
    cfg->clk_post = 60000 + 52 * ui;
    cfg->clk_pre = 8000;
    cfg->clk_prepare = 38000;
    cfg->clk_settle = 95000;
    cfg->clk_term_en = 0;
    cfg->clk_trail = 60000;
    cfg->clk_zero = 262000;
    cfg->d_term_en = 0;
    cfg->eot = 0;
    cfg->hs_exit = 100000;
    cfg->hs_prepare = 40000 + 4 * ui;
    cfg->hs_zero = 105000 + 6 * ui;
    cfg->hs_settle = 85000 + 6 * ui;
    cfg->hs_skip = 40000;

    /*
     * The MIPI D-PHY specification (Section 6.9, v1.2, Table 14, Page 40)
     * contains this formula as:
     *
     *     T_HS-TRAIL = max(n * 8 * ui, 60 + n * 4 * ui)
     *
     * where n = 1 for forward-direction HS mode and n = 4 for reverse-
     * direction HS mode. There's only one setting and this function does
     * not parameterize on anything other that ui, so this code will
     * assumes that reverse-direction HS mode is supported and uses n = 4.
     */
    cfg->hs_trail = max(4 * 8 * ui, 60000 + 4 * 4 * ui);

    cfg->init = 100;
    cfg->lpx = 50000;
    cfg->ta_get = 5 * cfg->lpx;
    cfg->ta_go = 4 * cfg->lpx;
    cfg->ta_sure = cfg->lpx;
    cfg->wakeup = 1000;

    cfg->hs_clk_rate = hs_clk_rate;
    cfg->lanes = lanes;

    return 0;
}
EXPORT_SYMBOL(phy_mipi_dphy_get_default_config);