phy_mipi_dphy_get_default_config-Toy模板网

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/*
* 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);文章来源地址https://www.toymoban.com/news/detail-686170.html

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