diff options
Diffstat (limited to 'drivers/video')
| -rw-r--r-- | drivers/video/mipi_dsi_northwest.c | 341 |
1 files changed, 329 insertions, 12 deletions
diff --git a/drivers/video/mipi_dsi_northwest.c b/drivers/video/mipi_dsi_northwest.c index dd118b377c..7817aa4e25 100644 --- a/drivers/video/mipi_dsi_northwest.c +++ b/drivers/video/mipi_dsi_northwest.c @@ -18,9 +18,20 @@ #include <mipi_dsi_northwest.h> #include <mipi_display.h> #include <imx_mipi_dsi_bridge.h> +#include <div64.h> #define MIPI_LCD_SLEEP_MODE_DELAY (120) #define MIPI_FIFO_TIMEOUT 250000 /* 250ms */ +#define PS2KHZ(ps) (1000000000UL / (ps)) + +#define DIV_ROUND_CLOSEST_ULL(x, divisor)( \ +{ \ + typeof(divisor) __d = divisor; \ + unsigned long long _tmp = (x) + (__d) / 2; \ + do_div(_tmp, __d); \ + _tmp; \ +} \ +) enum mipi_dsi_mode { DSI_COMMAND_MODE, @@ -47,6 +58,116 @@ struct mipi_dsi_northwest_info { struct fb_videomode mode; }; +struct pll_divider { + unsigned int cm; /* multiplier */ + unsigned int cn; /* predivider */ + unsigned int co; /* outdivider */ +}; + +/** + * 'CM' value to 'CM' reigister config value map + * 'CM' = [16, 255]; + */ +static unsigned int cm_map_table[240] = { + 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 16 ~ 23 */ + 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 24 ~ 31 */ + + 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 32 ~ 39 */ + 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 40 ~ 47 */ + + 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 48 ~ 55 */ + 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 56 ~ 63 */ + + 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 64 ~ 71 */ + 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 72 ~ 79 */ + + 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 80 ~ 87 */ + 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 88 ~ 95 */ + + 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 96 ~ 103 */ + 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 104 ~ 111 */ + + 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 112 ~ 119 */ + 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 120 ~ 127 */ + + 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 128 ~ 135 */ + 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 136 ~ 143 */ + + 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 144 ~ 151 */ + 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 152 ~ 159 */ + + 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 160 ~ 167 */ + 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 168 ~ 175 */ + + 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 176 ~ 183 */ + 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 184 ~ 191 */ + + 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 192 ~ 199 */ + 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 200 ~ 207 */ + + 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 208 ~ 215 */ + 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 216 ~ 223 */ + + 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 224 ~ 231 */ + 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 232 ~ 239 */ + + 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 240 ~ 247 */ + 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f /* 248 ~ 255 */ +}; + +/** + * map 'CN' value to 'CN' reigister config value + * 'CN' = [1, 32]; + */ +static unsigned int cn_map_table[32] = { + 0x1f, 0x00, 0x10, 0x18, 0x1c, 0x0e, 0x07, 0x13, /* 1 ~ 8 */ + 0x09, 0x04, 0x02, 0x11, 0x08, 0x14, 0x0a, 0x15, /* 9 ~ 16 */ + 0x1a, 0x1d, 0x1e, 0x0f, 0x17, 0x1b, 0x0d, 0x16, /* 17 ~ 24 */ + 0x0b, 0x05, 0x12, 0x19, 0x0c, 0x06, 0x03, 0x01 /* 25 ~ 32 */ +}; + +/** + * map 'CO' value to 'CO' reigister config value + * 'CO' = { 1, 2, 4, 8 }; + */ +static unsigned int co_map_table[4] = { + 0x0, 0x1, 0x2, 0x3 +}; + +unsigned long gcd(unsigned long a, unsigned long b) +{ + unsigned long r = a | b; + + if (!a || !b) + return r; + + /* Isolate lsbit of r */ + r &= -r; + + while (!(b & r)) + b >>= 1; + if (b == r) + return r; + + for (;;) { + while (!(a & r)) + a >>= 1; + if (a == r) + return r; + if (a == b) + return a; + + if (a < b) + swap(a, b); + a -= b; + a >>= 1; + if (a & r) + a += b; + a >>= 1; + } +} + + /** * board_mipi_panel_reset - give a reset cycle for mipi dsi panel * @@ -99,26 +220,222 @@ static void mipi_dsi_set_mode(struct mipi_dsi_northwest_info *mipi_dsi, static int mipi_dsi_dphy_init(struct mipi_dsi_northwest_info *mipi_dsi) { uint32_t time_out = 100; - uint32_t CN, CM, CO; uint32_t lock; + uint32_t req_bit_clk; + uint32_t bpp; + + int i, best_div = -1; + int64_t delta; + uint64_t least_delta = ~0U; + uint64_t limit, div_result; + uint64_t denominator, numerator, divisor; + uint64_t norm_denom, norm_num, split_denom; + struct pll_divider div = { 0 }; setbits_le32(mipi_dsi->sim_base + SIM_SOPT1, MIPI_ISO_DISABLE); - /* According to the RM, the dpi_pclk and clk_byte frequencies are related by the following formula: - * clk_byte_freq >= dpi_pclk_freq * DPI_pixel_size / ( 8 * (cfg_num_lanes + 1)) + bpp = mipi_dsi_pixel_format_to_bpp(mipi_dsi->dsi_panel_dev->format); + + /* req_bit_clk is PLL out, clk_byte is 1/8th of the req_bit_clk + * We need meet clk_byte_freq >= dpi_pclk_freq * DPI_pixel_size / ( 8 * (cfg_num_lanes + 1)) + */ + + req_bit_clk = PS2KHZ(mipi_dsi->mode.pixclock) * 1000U; + req_bit_clk = req_bit_clk * bpp; + + switch (mipi_dsi->dsi_panel_dev->lanes) { + case 1: + break; + case 2: + req_bit_clk = req_bit_clk >> 1; + break; + case 4: + req_bit_clk = req_bit_clk >> 2; + break; + default: + printf("requested data lane num is invalid\n"); + return -EINVAL; + } + + /* The max rate for PLL out is 800Mhz */ + if (req_bit_clk > 800000000) + return -EINVAL; + + /* calc CM, CN and CO according to PHY PLL formula: + * + * 'PLL out bitclk = refclk * CM / (CN * CO);' + * + * Let: + * 'numerator = bitclk / divisor'; + * 'denominator = refclk / divisor'; + * Then: + * 'numerator / denominator = CM / (CN * CO)'; + * + * CM is in [16, 255] + * CN is in [1, 32] + * CO is in { 1, 2, 4, 8 }; */ + divisor = gcd(24000000, req_bit_clk); + WARN_ON(divisor == 1); + + div_result = req_bit_clk; + do_div(div_result, divisor); + numerator = div_result; + + div_result = 24000000; + do_div(div_result, divisor); + denominator = div_result; + + /* denominator & numerator out of range check */ + if (DIV_ROUND_CLOSEST_ULL(numerator, denominator) > 255 || + DIV_ROUND_CLOSEST_ULL(denominator, numerator) > 32 * 8) + return -EINVAL; - /* PLL out clock = refclk * CM / (CN * CO) - * refclock = 24MHz - * pll vco = 24 * 40 / (3 * 1) = 320MHz + /* Normalization: reduce or increase + * numerator to [16, 255] + * denominator to [1, 32 * 8] + * Reduce normalization result is 'approximiate' + * Increase nomralization result is 'precise' */ - CN = 0x10; /* 3 */ - CM = 0xc8; /* 40 */ - CO = 0x0; /* 1 */ + if (numerator > 255 || denominator > 32 * 8) { + /* approximate */ + if (likely(numerator > denominator)) { + /* 'numerator > 255'; + * 'limit' should meet below conditions: + * a. '(numerator / limit) >= 16' + * b. '(denominator / limit) >= 1' + */ + limit = min(denominator, + DIV_ROUND_CLOSEST_ULL(numerator, 16)); + + /* Let: + * norm_num = numerator / i; + * norm_denom = denominator / i; + * + * So: + * delta = numerator * norm_denom - + * denominator * norm_num + */ + for (i = 2; i <= limit; i++) { + norm_num = DIV_ROUND_CLOSEST_ULL(numerator, i); + if (norm_num > 255) + continue; + + norm_denom = DIV_ROUND_CLOSEST_ULL(denominator, i); + + /* 'norm_num <= 255' && 'norm_num > norm_denom' + * so, 'norm_denom < 256' + */ + delta = numerator * norm_denom - + denominator * norm_num; + delta = abs(delta); + if (delta < least_delta) { + least_delta = delta; + best_div = i; + } else if (delta == least_delta) { + /* choose better one IF: + * 'norm_denom' derived from last 'best_div' + * needs later split, i.e, 'norm_denom > 32'. + */ + if (DIV_ROUND_CLOSEST_ULL(denominator, best_div) > 32) { + least_delta = delta; + best_div = i; + } + } + } + } else { + /* 'denominator > 32 * 8'; + * 'limit' should meet below conditions: + * a. '(numerator / limit >= 16' + * b. '(denominator / limit >= 1': obviously. + */ + limit = DIV_ROUND_CLOSEST_ULL(numerator, 16); + if (!limit || + DIV_ROUND_CLOSEST_ULL(denominator, limit) > 32 * 8) + return -EINVAL; + + for (i = 2; i <= limit; i++) { + norm_denom = DIV_ROUND_CLOSEST_ULL(denominator, i); + if (norm_denom > 32 * 8) + continue; + + norm_num = DIV_ROUND_CLOSEST_ULL(numerator, i); + + /* 'norm_denom <= 256' && 'norm_num < norm_denom' + * so, 'norm_num <= 255' + */ + delta = numerator * norm_denom - + denominator * norm_num; + delta = abs(delta); + if (delta < least_delta) { + least_delta = delta; + best_div = i; + } else if (delta == least_delta) { + if (DIV_ROUND_CLOSEST_ULL(denominator, best_div) > 32) { + least_delta = delta; + best_div = i; + } + } + } + } + + numerator = DIV_ROUND_CLOSEST_ULL(numerator, best_div); + denominator = DIV_ROUND_CLOSEST_ULL(denominator, best_div); + } else if (numerator < 16) { + /* precise */ + + /* 'limit' should meet below conditions: + * a. 'denominator * limit <= 32 * 8' + * b. '16 <= numerator * limit <= 255' + * Choose 'limit' to be the least value + * which makes 'numerator * limit' to be + * in [16, 255]. + */ + limit = min(256 / (uint32_t)denominator, + 255 / (uint32_t)numerator); + if (limit == 1 || limit < DIV_ROUND_UP_ULL(16, numerator)) + return -EINVAL; + + /* choose the least available value for 'limit' */ + limit = DIV_ROUND_UP_ULL(16, numerator); + numerator = numerator * limit; + denominator = denominator * limit; + + WARN_ON(numerator < 16 || denominator > 32 * 8); + } + + div.cm = cm_map_table[numerator - 16]; + + /* split 'denominator' to 'CN' and 'CO' */ + if (denominator > 32) { + /* traverse four possible values of 'CO' + * there must be some value of 'CO' can be used + */ + least_delta = ~0U; + for (i = 0; i < 4; i++) { + split_denom = DIV_ROUND_CLOSEST_ULL(denominator, 1 << i); + if (split_denom > 32) + continue; + + /* calc deviation to choose the best one */ + delta = denominator - split_denom * (1 << i); + delta = abs(delta); + if (delta < least_delta) { + least_delta = delta; + div.co = co_map_table[i]; + div.cn = cn_map_table[split_denom - 1]; + } + } + } else { + div.co = co_map_table[1 >> 1]; + div.cn = cn_map_table[denominator - 1]; + } + + debug("cn 0x%x, cm 0x%x, co 0x%x\n", div.cn, div.cm, div.co); - writel(CN, mipi_dsi->mmio_base + DPHY_CN); - writel(CM, mipi_dsi->mmio_base + DPHY_CM); - writel(CO, mipi_dsi->mmio_base + DPHY_CO); + writel(div.cn, mipi_dsi->mmio_base + DPHY_CN); + writel(div.cm, mipi_dsi->mmio_base + DPHY_CM); + writel(div.co, mipi_dsi->mmio_base + DPHY_CO); writel(0x25, mipi_dsi->mmio_base + DPHY_TST); writel(0x0, mipi_dsi->mmio_base + DPHY_PD_PLL); |