diff options
Diffstat (limited to 'drivers/media/i2c/ccs-pll.c')
| -rw-r--r-- | drivers/media/i2c/ccs-pll.c | 886 |
1 files changed, 886 insertions, 0 deletions
diff --git a/drivers/media/i2c/ccs-pll.c b/drivers/media/i2c/ccs-pll.c new file mode 100644 index 000000000000..eb7b6f01f623 --- /dev/null +++ b/drivers/media/i2c/ccs-pll.c @@ -0,0 +1,886 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * drivers/media/i2c/ccs-pll.c + * + * Generic MIPI CCS/SMIA/SMIA++ PLL calculator + * + * Copyright (C) 2020 Intel Corporation + * Copyright (C) 2011--2012 Nokia Corporation + * Contact: Sakari Ailus <sakari.ailus@linux.intel.com> + */ + +#include <linux/device.h> +#include <linux/gcd.h> +#include <linux/lcm.h> +#include <linux/module.h> + +#include "ccs-pll.h" + +/* Return an even number or one. */ +static inline uint32_t clk_div_even(uint32_t a) +{ + return max_t(uint32_t, 1, a & ~1); +} + +/* Return an even number or one. */ +static inline uint32_t clk_div_even_up(uint32_t a) +{ + if (a == 1) + return 1; + return (a + 1) & ~1; +} + +static inline uint32_t is_one_or_even(uint32_t a) +{ + if (a == 1) + return 1; + if (a & 1) + return 0; + + return 1; +} + +static inline uint32_t one_or_more(uint32_t a) +{ + return a ?: 1; +} + +static int bounds_check(struct device *dev, uint32_t val, + uint32_t min, uint32_t max, const char *prefix, + char *str) +{ + if (val >= min && val <= max) + return 0; + + dev_dbg(dev, "%s_%s out of bounds: %d (%d--%d)\n", prefix, + str, val, min, max); + + return -EINVAL; +} + +#define PLL_OP 1 +#define PLL_VT 2 + +static const char *pll_string(unsigned int which) +{ + switch (which) { + case PLL_OP: + return "op"; + case PLL_VT: + return "vt"; + } + + return NULL; +} + +#define PLL_FL(f) CCS_PLL_FLAG_##f + +static void print_pll(struct device *dev, struct ccs_pll *pll) +{ + const struct { + struct ccs_pll_branch_fr *fr; + struct ccs_pll_branch_bk *bk; + unsigned int which; + } branches[] = { + { &pll->vt_fr, &pll->vt_bk, PLL_VT }, + { &pll->op_fr, &pll->op_bk, PLL_OP } + }, *br; + unsigned int i; + + dev_dbg(dev, "ext_clk_freq_hz\t\t%u\n", pll->ext_clk_freq_hz); + + for (i = 0, br = branches; i < ARRAY_SIZE(branches); i++, br++) { + const char *s = pll_string(br->which); + + if (pll->flags & CCS_PLL_FLAG_DUAL_PLL || + br->which == PLL_VT) { + dev_dbg(dev, "%s_pre_pll_clk_div\t\t%u\n", s, + br->fr->pre_pll_clk_div); + dev_dbg(dev, "%s_pll_multiplier\t\t%u\n", s, + br->fr->pll_multiplier); + + dev_dbg(dev, "%s_pll_ip_clk_freq_hz\t%u\n", s, + br->fr->pll_ip_clk_freq_hz); + dev_dbg(dev, "%s_pll_op_clk_freq_hz\t%u\n", s, + br->fr->pll_op_clk_freq_hz); + } + + if (!(pll->flags & CCS_PLL_FLAG_NO_OP_CLOCKS) || + br->which == PLL_VT) { + dev_dbg(dev, "%s_sys_clk_div\t\t%u\n", s, + br->bk->sys_clk_div); + dev_dbg(dev, "%s_pix_clk_div\t\t%u\n", s, + br->bk->pix_clk_div); + + dev_dbg(dev, "%s_sys_clk_freq_hz\t%u\n", s, + br->bk->sys_clk_freq_hz); + dev_dbg(dev, "%s_pix_clk_freq_hz\t%u\n", s, + br->bk->pix_clk_freq_hz); + } + } + + dev_dbg(dev, "pixel rate in pixel array:\t%u\n", + pll->pixel_rate_pixel_array); + dev_dbg(dev, "pixel rate on CSI-2 bus:\t%u\n", + pll->pixel_rate_csi); + + dev_dbg(dev, "flags%s%s%s%s%s%s%s%s%s\n", + pll->flags & PLL_FL(LANE_SPEED_MODEL) ? " lane-speed" : "", + pll->flags & PLL_FL(LINK_DECOUPLED) ? " link-decoupled" : "", + pll->flags & PLL_FL(EXT_IP_PLL_DIVIDER) ? + " ext-ip-pll-divider" : "", + pll->flags & PLL_FL(FLEXIBLE_OP_PIX_CLK_DIV) ? + " flexible-op-pix-div" : "", + pll->flags & PLL_FL(FIFO_DERATING) ? " fifo-derating" : "", + pll->flags & PLL_FL(FIFO_OVERRATING) ? " fifo-overrating" : "", + pll->flags & PLL_FL(DUAL_PLL) ? " dual-pll" : "", + pll->flags & PLL_FL(OP_SYS_DDR) ? " op-sys-ddr" : "", + pll->flags & PLL_FL(OP_PIX_DDR) ? " op-pix-ddr" : ""); +} + +static uint32_t op_sys_ddr(uint32_t flags) +{ + return flags & CCS_PLL_FLAG_OP_SYS_DDR ? 1 : 0; +} + +static uint32_t op_pix_ddr(uint32_t flags) +{ + return flags & CCS_PLL_FLAG_OP_PIX_DDR ? 1 : 0; +} + +static int check_fr_bounds(struct device *dev, + const struct ccs_pll_limits *lim, + struct ccs_pll *pll, unsigned int which) +{ + const struct ccs_pll_branch_limits_fr *lim_fr; + struct ccs_pll_branch_fr *pll_fr; + const char *s = pll_string(which); + int rval; + + if (which == PLL_OP) { + lim_fr = &lim->op_fr; + pll_fr = &pll->op_fr; + } else { + lim_fr = &lim->vt_fr; + pll_fr = &pll->vt_fr; + } + + rval = bounds_check(dev, pll_fr->pre_pll_clk_div, + lim_fr->min_pre_pll_clk_div, + lim_fr->max_pre_pll_clk_div, s, "pre_pll_clk_div"); + + if (!rval) + rval = bounds_check(dev, pll_fr->pll_ip_clk_freq_hz, + lim_fr->min_pll_ip_clk_freq_hz, + lim_fr->max_pll_ip_clk_freq_hz, + s, "pll_ip_clk_freq_hz"); + if (!rval) + rval = bounds_check(dev, pll_fr->pll_multiplier, + lim_fr->min_pll_multiplier, + lim_fr->max_pll_multiplier, + s, "pll_multiplier"); + if (!rval) + rval = bounds_check(dev, pll_fr->pll_op_clk_freq_hz, + lim_fr->min_pll_op_clk_freq_hz, + lim_fr->max_pll_op_clk_freq_hz, + s, "pll_op_clk_freq_hz"); + + return rval; +} + +static int check_bk_bounds(struct device *dev, + const struct ccs_pll_limits *lim, + struct ccs_pll *pll, unsigned int which) +{ + const struct ccs_pll_branch_limits_bk *lim_bk; + struct ccs_pll_branch_bk *pll_bk; + const char *s = pll_string(which); + int rval; + + if (which == PLL_OP) { + if (pll->flags & CCS_PLL_FLAG_NO_OP_CLOCKS) + return 0; + + lim_bk = &lim->op_bk; + pll_bk = &pll->op_bk; + } else { + lim_bk = &lim->vt_bk; + pll_bk = &pll->vt_bk; + } + + rval = bounds_check(dev, pll_bk->sys_clk_div, + lim_bk->min_sys_clk_div, + lim_bk->max_sys_clk_div, s, "op_sys_clk_div"); + if (!rval) + rval = bounds_check(dev, pll_bk->sys_clk_freq_hz, + lim_bk->min_sys_clk_freq_hz, + lim_bk->max_sys_clk_freq_hz, + s, "sys_clk_freq_hz"); + if (!rval) + rval = bounds_check(dev, pll_bk->sys_clk_div, + lim_bk->min_sys_clk_div, + lim_bk->max_sys_clk_div, + s, "sys_clk_div"); + if (!rval) + rval = bounds_check(dev, pll_bk->pix_clk_freq_hz, + lim_bk->min_pix_clk_freq_hz, + lim_bk->max_pix_clk_freq_hz, + s, "pix_clk_freq_hz"); + + return rval; +} + +static int check_ext_bounds(struct device *dev, struct ccs_pll *pll) +{ + if (!(pll->flags & CCS_PLL_FLAG_FIFO_DERATING) && + pll->pixel_rate_pixel_array > pll->pixel_rate_csi) { + dev_dbg(dev, "device does not support derating\n"); + return -EINVAL; + } + + if (!(pll->flags & CCS_PLL_FLAG_FIFO_OVERRATING) && + pll->pixel_rate_pixel_array < pll->pixel_rate_csi) { + dev_dbg(dev, "device does not support overrating\n"); + return -EINVAL; + } + + return 0; +} + +static void +ccs_pll_find_vt_sys_div(struct device *dev, const struct ccs_pll_limits *lim, + struct ccs_pll *pll, struct ccs_pll_branch_fr *pll_fr, + uint16_t min_vt_div, uint16_t max_vt_div, + uint16_t *min_sys_div, uint16_t *max_sys_div) +{ + /* + * Find limits for sys_clk_div. Not all values are possible with all + * values of pix_clk_div. + */ + *min_sys_div = lim->vt_bk.min_sys_clk_div; + dev_dbg(dev, "min_sys_div: %u\n", *min_sys_div); + *min_sys_div = max_t(uint16_t, *min_sys_div, + DIV_ROUND_UP(min_vt_div, + lim->vt_bk.max_pix_clk_div)); + dev_dbg(dev, "min_sys_div: max_vt_pix_clk_div: %u\n", *min_sys_div); + *min_sys_div = max_t(uint16_t, *min_sys_div, + pll_fr->pll_op_clk_freq_hz + / lim->vt_bk.max_sys_clk_freq_hz); + dev_dbg(dev, "min_sys_div: max_pll_op_clk_freq_hz: %u\n", *min_sys_div); + *min_sys_div = clk_div_even_up(*min_sys_div); + dev_dbg(dev, "min_sys_div: one or even: %u\n", *min_sys_div); + + *max_sys_div = lim->vt_bk.max_sys_clk_div; + dev_dbg(dev, "max_sys_div: %u\n", *max_sys_div); + *max_sys_div = min_t(uint16_t, *max_sys_div, + DIV_ROUND_UP(max_vt_div, + lim->vt_bk.min_pix_clk_div)); + dev_dbg(dev, "max_sys_div: min_vt_pix_clk_div: %u\n", *max_sys_div); + *max_sys_div = min_t(uint16_t, *max_sys_div, + DIV_ROUND_UP(pll_fr->pll_op_clk_freq_hz, + lim->vt_bk.min_pix_clk_freq_hz)); + dev_dbg(dev, "max_sys_div: min_vt_pix_clk_freq_hz: %u\n", *max_sys_div); +} + +#define CPHY_CONST 7 +#define DPHY_CONST 16 +#define PHY_CONST_DIV 16 + +static inline int +__ccs_pll_calculate_vt_tree(struct device *dev, + const struct ccs_pll_limits *lim, + struct ccs_pll *pll, uint32_t mul, uint32_t div) +{ + const struct ccs_pll_branch_limits_fr *lim_fr = &lim->vt_fr; + const struct ccs_pll_branch_limits_bk *lim_bk = &lim->vt_bk; + struct ccs_pll_branch_fr *pll_fr = &pll->vt_fr; + struct ccs_pll_branch_bk *pll_bk = &pll->vt_bk; + uint32_t more_mul; + uint16_t best_pix_div = SHRT_MAX >> 1, best_div; + uint16_t vt_div, min_sys_div, max_sys_div, sys_div; + + pll_fr->pll_ip_clk_freq_hz = + pll->ext_clk_freq_hz / pll_fr->pre_pll_clk_div; + + dev_dbg(dev, "vt_pll_ip_clk_freq_hz %u\n", pll_fr->pll_ip_clk_freq_hz); + + more_mul = one_or_more(DIV_ROUND_UP(lim_fr->min_pll_op_clk_freq_hz, + pll_fr->pll_ip_clk_freq_hz * mul)); + + dev_dbg(dev, "more_mul: %u\n", more_mul); + more_mul *= DIV_ROUND_UP(lim_fr->min_pll_multiplier, mul * more_mul); + dev_dbg(dev, "more_mul2: %u\n", more_mul); + + pll_fr->pll_multiplier = mul * more_mul; + + if (pll_fr->pll_multiplier * pll_fr->pll_ip_clk_freq_hz > + lim_fr->max_pll_op_clk_freq_hz) + return -EINVAL; + + pll_fr->pll_op_clk_freq_hz = + pll_fr->pll_ip_clk_freq_hz * pll_fr->pll_multiplier; + + vt_div = div * more_mul; + + ccs_pll_find_vt_sys_div(dev, lim, pll, pll_fr, vt_div, vt_div, + &min_sys_div, &max_sys_div); + + max_sys_div = (vt_div & 1) ? 1 : max_sys_div; + + dev_dbg(dev, "vt min/max_sys_div: %u,%u\n", min_sys_div, max_sys_div); + + for (sys_div = min_sys_div; sys_div <= max_sys_div; + sys_div += 2 - (sys_div & 1)) { + uint16_t pix_div; + + if (vt_div % sys_div) + continue; + + pix_div = vt_div / sys_div; + + if (pix_div < lim_bk->min_pix_clk_div || + pix_div > lim_bk->max_pix_clk_div) { + dev_dbg(dev, + "pix_div %u too small or too big (%u--%u)\n", + pix_div, + lim_bk->min_pix_clk_div, + lim_bk->max_pix_clk_div); + continue; + } + + dev_dbg(dev, "sys/pix/best_pix: %u,%u,%u\n", sys_div, pix_div, + best_pix_div); + + if (pix_div * sys_div <= best_pix_div) { + best_pix_div = pix_div; + best_div = pix_div * sys_div; + } + } + if (best_pix_div == SHRT_MAX >> 1) + return -EINVAL; + + pll_bk->sys_clk_div = best_div / best_pix_div; + pll_bk->pix_clk_div = best_pix_div; + + pll_bk->sys_clk_freq_hz = + pll_fr->pll_op_clk_freq_hz / pll_bk->sys_clk_div; + pll_bk->pix_clk_freq_hz = + pll_bk->sys_clk_freq_hz / pll_bk->pix_clk_div; + + pll->pixel_rate_pixel_array = + pll_bk->pix_clk_freq_hz * pll->vt_lanes; + + return 0; +} + +static int ccs_pll_calculate_vt_tree(struct device *dev, + const struct ccs_pll_limits *lim, + struct ccs_pll *pll) +{ + const struct ccs_pll_branch_limits_fr *lim_fr = &lim->vt_fr; + struct ccs_pll_branch_fr *pll_fr = &pll->vt_fr; + uint16_t min_pre_pll_clk_div = lim_fr->min_pre_pll_clk_div; + uint16_t max_pre_pll_clk_div = lim_fr->max_pre_pll_clk_div; + uint32_t pre_mul, pre_div; + + pre_div = gcd(pll->pixel_rate_csi, + pll->ext_clk_freq_hz * pll->vt_lanes); + pre_mul = pll->pixel_rate_csi / pre_div; + pre_div = pll->ext_clk_freq_hz * pll->vt_lanes / pre_div; + + /* Make sure PLL input frequency is within limits */ + max_pre_pll_clk_div = + min_t(uint16_t, max_pre_pll_clk_div, + DIV_ROUND_UP(pll->ext_clk_freq_hz, + lim_fr->min_pll_ip_clk_freq_hz)); + + min_pre_pll_clk_div = max_t(uint16_t, min_pre_pll_clk_div, + pll->ext_clk_freq_hz / + lim_fr->max_pll_ip_clk_freq_hz); + + dev_dbg(dev, "vt min/max_pre_pll_clk_div: %u,%u\n", + min_pre_pll_clk_div, max_pre_pll_clk_div); + + for (pll_fr->pre_pll_clk_div = min_pre_pll_clk_div; + pll_fr->pre_pll_clk_div <= max_pre_pll_clk_div; + pll_fr->pre_pll_clk_div += + (pll->flags & CCS_PLL_FLAG_EXT_IP_PLL_DIVIDER) ? 1 : + 2 - (pll_fr->pre_pll_clk_div & 1)) { + uint32_t mul, div; + int rval; + + div = gcd(pre_mul * pll_fr->pre_pll_clk_div, pre_div); + mul = pre_mul * pll_fr->pre_pll_clk_div / div; + div = pre_div / div; + + dev_dbg(dev, "vt pre-div/mul/div: %u,%u,%u\n", + pll_fr->pre_pll_clk_div, mul, div); + + rval = __ccs_pll_calculate_vt_tree(dev, lim, pll, + mul, div); + if (rval) + continue; + + rval = check_fr_bounds(dev, lim, pll, PLL_VT); + if (rval) + continue; + + rval = check_bk_bounds(dev, lim, pll, PLL_VT); + if (rval) + continue; + + return 0; + } + + return -EINVAL; +} + +static void +ccs_pll_calculate_vt(struct device *dev, const struct ccs_pll_limits *lim, + const struct ccs_pll_branch_limits_bk *op_lim_bk, + struct ccs_pll *pll, struct ccs_pll_branch_fr *pll_fr, + struct ccs_pll_branch_bk *op_pll_bk, bool cphy, + uint32_t phy_const) +{ + uint16_t sys_div; + uint16_t best_pix_div = SHRT_MAX >> 1; + uint16_t vt_op_binning_div; + uint16_t min_vt_div, max_vt_div, vt_div; + uint16_t min_sys_div, max_sys_div; + + if (pll->flags & CCS_PLL_FLAG_NO_OP_CLOCKS) + goto out_calc_pixel_rate; + + /* + * Find out whether a sensor supports derating. If it does not, VT and + * OP domains are required to run at the same pixel rate. + */ + if (!(pll->flags & CCS_PLL_FLAG_FIFO_DERATING)) { + min_vt_div = + op_pll_bk->sys_clk_div * op_pll_bk->pix_clk_div + * pll->vt_lanes * phy_const / pll->op_lanes + / (PHY_CONST_DIV << op_pix_ddr(pll->flags)); + } else { + /* + * Some sensors perform analogue binning and some do this + * digitally. The ones doing this digitally can be roughly be + * found out using this formula. The ones doing this digitally + * should run at higher clock rate, so smaller divisor is used + * on video timing side. + */ + if (lim->min_line_length_pck_bin > lim->min_line_length_pck + / pll->binning_horizontal) + vt_op_binning_div = pll->binning_horizontal; + else + vt_op_binning_div = 1; + dev_dbg(dev, "vt_op_binning_div: %u\n", vt_op_binning_div); + + /* + * Profile 2 supports vt_pix_clk_div E [4, 10] + * + * Horizontal binning can be used as a base for difference in + * divisors. One must make sure that horizontal blanking is + * enough to accommodate the CSI-2 sync codes. + * + * Take scaling factor and number of VT lanes into account as well. + * + * Find absolute limits for the factor of vt divider. + */ + dev_dbg(dev, "scale_m: %u\n", pll->scale_m); + min_vt_div = + DIV_ROUND_UP(pll->bits_per_pixel + * op_pll_bk->sys_clk_div * pll->scale_n + * pll->vt_lanes * phy_const, + (pll->flags & + CCS_PLL_FLAG_LANE_SPEED_MODEL ? + pll->csi2.lanes : 1) + * vt_op_binning_div * pll->scale_m + * PHY_CONST_DIV << op_pix_ddr(pll->flags)); + } + + /* Find smallest and biggest allowed vt divisor. */ + dev_dbg(dev, "min_vt_div: %u\n", min_vt_div); + min_vt_div = max_t(uint16_t, min_vt_div, + DIV_ROUND_UP(pll_fr->pll_op_clk_freq_hz, + lim->vt_bk.max_pix_clk_freq_hz)); + dev_dbg(dev, "min_vt_div: max_vt_pix_clk_freq_hz: %u\n", + min_vt_div); + min_vt_div = max_t(uint16_t, min_vt_div, lim->vt_bk.min_pix_clk_div + * lim->vt_bk.min_sys_clk_div); + dev_dbg(dev, "min_vt_div: min_vt_clk_div: %u\n", min_vt_div); + + max_vt_div = lim->vt_bk.max_sys_clk_div * lim->vt_bk.max_pix_clk_div; + dev_dbg(dev, "max_vt_div: %u\n", max_vt_div); + max_vt_div = min_t(uint16_t, max_vt_div, + DIV_ROUND_UP(pll_fr->pll_op_clk_freq_hz, + lim->vt_bk.min_pix_clk_freq_hz)); + dev_dbg(dev, "max_vt_div: min_vt_pix_clk_freq_hz: %u\n", + max_vt_div); + + ccs_pll_find_vt_sys_div(dev, lim, pll, pll_fr, min_vt_div, + max_vt_div, &min_sys_div, &max_sys_div); + + /* + * Find pix_div such that a legal pix_div * sys_div results + * into a value which is not smaller than div, the desired + * divisor. + */ + for (vt_div = min_vt_div; vt_div <= max_vt_div; vt_div++) { + uint16_t __max_sys_div = vt_div & 1 ? 1 : max_sys_div; + + for (sys_div = min_sys_div; sys_div <= __max_sys_div; + sys_div += 2 - (sys_div & 1)) { + uint16_t pix_div; + uint16_t rounded_div; + + pix_div = DIV_ROUND_UP(vt_div, sys_div); + + if (pix_div < lim->vt_bk.min_pix_clk_div + || pix_div > lim->vt_bk.max_pix_clk_div) { + dev_dbg(dev, + "pix_div %u too small or too big (%u--%u)\n", + pix_div, + lim->vt_bk.min_pix_clk_div, + lim->vt_bk.max_pix_clk_div); + continue; + } + + rounded_div = roundup(vt_div, best_pix_div); + + /* Check if this one is better. */ + if (pix_div * sys_div <= rounded_div) + best_pix_div = pix_div; + + /* Bail out if we've already found the best value. */ + if (vt_div == rounded_div) + break; + } + if (best_pix_div < SHRT_MAX >> 1) + break; + } + + pll->vt_bk.sys_clk_div = DIV_ROUND_UP(vt_div, best_pix_div); + pll->vt_bk.pix_clk_div = best_pix_div; + + pll->vt_bk.sys_clk_freq_hz = + pll_fr->pll_op_clk_freq_hz / pll->vt_bk.sys_clk_div; + pll->vt_bk.pix_clk_freq_hz = + pll->vt_bk.sys_clk_freq_hz / pll->vt_bk.pix_clk_div; + +out_calc_pixel_rate: + pll->pixel_rate_pixel_array = + pll->vt_bk.pix_clk_freq_hz * pll->vt_lanes; +} + +/* + * Heuristically guess the PLL tree for a given common multiplier and + * divisor. Begin with the operational timing and continue to video + * timing once operational timing has been verified. + * + * @mul is the PLL multiplier and @div is the common divisor + * (pre_pll_clk_div and op_sys_clk_div combined). The final PLL + * multiplier will be a multiple of @mul. + * + * @return Zero on success, error code on error. + */ +static int +ccs_pll_calculate_op(struct device *dev, const struct ccs_pll_limits *lim, + const struct ccs_pll_branch_limits_fr *op_lim_fr, + const struct ccs_pll_branch_limits_bk *op_lim_bk, + struct ccs_pll *pll, struct ccs_pll_branch_fr *op_pll_fr, + struct ccs_pll_branch_bk *op_pll_bk, uint32_t mul, + uint32_t div, uint32_t op_sys_clk_freq_hz_sdr, uint32_t l, + bool cphy, uint32_t phy_const) +{ + /* + * Higher multipliers (and divisors) are often required than + * necessitated by the external clock and the output clocks. + * There are limits for all values in the clock tree. These + * are the minimum and maximum multiplier for mul. + */ + uint32_t more_mul_min, more_mul_max; + uint32_t more_mul_factor; + uint32_t i; + + /* + * Get pre_pll_clk_div so that our pll_op_clk_freq_hz won't be + * too high. + */ + dev_dbg(dev, "op_pre_pll_clk_div %u\n", op_pll_fr->pre_pll_clk_div); + + /* Don't go above max pll multiplier. */ + more_mul_max = op_lim_fr->max_pll_multiplier / mul; + dev_dbg(dev, "more_mul_max: max_op_pll_multiplier check: %u\n", + more_mul_max); + /* Don't go above max pll op frequency. */ + more_mul_max = + min_t(uint32_t, + more_mul_max, + op_lim_fr->max_pll_op_clk_freq_hz + / (pll->ext_clk_freq_hz / + op_pll_fr->pre_pll_clk_div * mul)); + dev_dbg(dev, "more_mul_max: max_pll_op_clk_freq_hz check: %u\n", + more_mul_max); + /* Don't go above the division capability of op sys clock divider. */ + more_mul_max = min(more_mul_max, + op_lim_bk->max_sys_clk_div * op_pll_fr->pre_pll_clk_div + / div); + dev_dbg(dev, "more_mul_max: max_op_sys_clk_div check: %u\n", + more_mul_max); + /* Ensure we won't go above max_pll_multiplier. */ + more_mul_max = min(more_mul_max, op_lim_fr->max_pll_multiplier / mul); + dev_dbg(dev, "more_mul_max: min_pll_multiplier check: %u\n", + more_mul_max); + + /* Ensure we won't go below min_pll_op_clk_freq_hz. */ + more_mul_min = DIV_ROUND_UP(op_lim_fr->min_pll_op_clk_freq_hz, + pll->ext_clk_freq_hz / + op_pll_fr->pre_pll_clk_div * mul); + dev_dbg(dev, "more_mul_min: min_op_pll_op_clk_freq_hz check: %u\n", + more_mul_min); + /* Ensure we won't go below min_pll_multiplier. */ + more_mul_min = max(more_mul_min, + DIV_ROUND_UP(op_lim_fr->min_pll_multiplier, mul)); + dev_dbg(dev, "more_mul_min: min_op_pll_multiplier check: %u\n", + more_mul_min); + + if (more_mul_min > more_mul_max) { + dev_dbg(dev, + "unable to compute more_mul_min and more_mul_max\n"); + return -EINVAL; + } + + more_mul_factor = lcm(div, op_pll_fr->pre_pll_clk_div) / div; + dev_dbg(dev, "more_mul_factor: %u\n", more_mul_factor); + more_mul_factor = lcm(more_mul_factor, op_lim_bk->min_sys_clk_div); + dev_dbg(dev, "more_mul_factor: min_op_sys_clk_div: %d\n", + more_mul_factor); + i = roundup(more_mul_min, more_mul_factor); + if (!is_one_or_even(i)) + i <<= 1; + + dev_dbg(dev, "final more_mul: %u\n", i); + if (i > more_mul_max) { + dev_dbg(dev, "final more_mul is bad, max %u\n", more_mul_max); + return -EINVAL; + } + + op_pll_fr->pll_multiplier = mul * i; + op_pll_bk->sys_clk_div = div * i / op_pll_fr->pre_pll_clk_div; + dev_dbg(dev, "op_sys_clk_div: %u\n", op_pll_bk->sys_clk_div); + + op_pll_fr->pll_ip_clk_freq_hz = pll->ext_clk_freq_hz + / op_pll_fr->pre_pll_clk_div; + + op_pll_fr->pll_op_clk_freq_hz = op_pll_fr->pll_ip_clk_freq_hz + * op_pll_fr->pll_multiplier; + + if (pll->flags & CCS_PLL_FLAG_LANE_SPEED_MODEL) + op_pll_bk->pix_clk_div = + (pll->bits_per_pixel + * pll->op_lanes * (phy_const << op_sys_ddr(pll->flags)) + / PHY_CONST_DIV / pll->csi2.lanes / l) + >> op_pix_ddr(pll->flags); + else + op_pll_bk->pix_clk_div = + (pll->bits_per_pixel + * (phy_const << op_sys_ddr(pll->flags)) + / PHY_CONST_DIV / l) >> op_pix_ddr(pll->flags); + + op_pll_bk->pix_clk_freq_hz = + (op_sys_clk_freq_hz_sdr >> op_pix_ddr(pll->flags)) + / op_pll_bk->pix_clk_div; + op_pll_bk->sys_clk_freq_hz = + op_sys_clk_freq_hz_sdr >> op_sys_ddr(pll->flags); + + dev_dbg(dev, "op_pix_clk_div: %u\n", op_pll_bk->pix_clk_div); + + return 0; +} + +int ccs_pll_calculate(struct device *dev, const struct ccs_pll_limits *lim, + struct ccs_pll *pll) +{ + const struct ccs_pll_branch_limits_fr *op_lim_fr; + const struct ccs_pll_branch_limits_bk *op_lim_bk; + struct ccs_pll_branch_fr *op_pll_fr; + struct ccs_pll_branch_bk *op_pll_bk; + bool cphy = pll->bus_type == CCS_PLL_BUS_TYPE_CSI2_CPHY; + uint32_t phy_const = cphy ? CPHY_CONST : DPHY_CONST; + uint32_t op_sys_clk_freq_hz_sdr; + uint16_t min_op_pre_pll_clk_div; + uint16_t max_op_pre_pll_clk_div; + uint32_t mul, div; + uint32_t l = (!pll->op_bits_per_lane || + pll->op_bits_per_lane >= pll->bits_per_pixel) ? 1 : 2; + uint32_t i; + int rval = -EINVAL; + + if (!(pll->flags & CCS_PLL_FLAG_LANE_SPEED_MODEL)) { + pll->op_lanes = 1; + pll->vt_lanes = 1; + } + + if (pll->flags & CCS_PLL_FLAG_DUAL_PLL) { + op_lim_fr = &lim->op_fr; + op_lim_bk = &lim->op_bk; + op_pll_fr = &pll->op_fr; + op_pll_bk = &pll->op_bk; + } else if (pll->flags & CCS_PLL_FLAG_NO_OP_CLOCKS) { + /* + * If there's no OP PLL at all, use the VT values + * instead. The OP values are ignored for the rest of + * the PLL calculation. + */ + op_lim_fr = &lim->vt_fr; + op_lim_bk = &lim->vt_bk; + op_pll_fr = &pll->vt_fr; + op_pll_bk = &pll->vt_bk; + } else { + op_lim_fr = &lim->vt_fr; + op_lim_bk = &lim->op_bk; + op_pll_fr = &pll->vt_fr; + op_pll_bk = &pll->op_bk; + } + + if (!pll->op_lanes || !pll->vt_lanes || !pll->bits_per_pixel || + !pll->ext_clk_freq_hz || !pll->link_freq || !pll->scale_m || + !op_lim_fr->min_pll_ip_clk_freq_hz || + !op_lim_fr->max_pll_ip_clk_freq_hz || + !op_lim_fr->min_pll_op_clk_freq_hz || + !op_lim_fr->max_pll_op_clk_freq_hz || + !op_lim_bk->max_sys_clk_div || !op_lim_fr->max_pll_multiplier) + return -EINVAL; + + /* + * Make sure op_pix_clk_div will be integer --- unless flexible + * op_pix_clk_div is supported + */ + if (!(pll->flags & CCS_PLL_FLAG_FLEXIBLE_OP_PIX_CLK_DIV) && + (pll->bits_per_pixel * pll->op_lanes) % + (pll->csi2.lanes * l << op_pix_ddr(pll->flags))) { + dev_dbg(dev, "op_pix_clk_div not an integer (bpp %u, op lanes %u, lanes %u, l %u)\n", + pll->bits_per_pixel, pll->op_lanes, pll->csi2.lanes, l); + return -EINVAL; + } + + dev_dbg(dev, "vt_lanes: %u\n", pll->vt_lanes); + dev_dbg(dev, "op_lanes: %u\n", pll->op_lanes); + + dev_dbg(dev, "binning: %ux%u\n", pll->binning_horizontal, + pll->binning_vertical); + + switch (pll->bus_type) { + case CCS_PLL_BUS_TYPE_CSI2_DPHY: + /* CSI transfers 2 bits per clock per lane; thus times 2 */ + op_sys_clk_freq_hz_sdr = pll->link_freq * 2 + * (pll->flags & CCS_PLL_FLAG_LANE_SPEED_MODEL ? + 1 : pll->csi2.lanes); + break; + case CCS_PLL_BUS_TYPE_CSI2_CPHY: + op_sys_clk_freq_hz_sdr = + pll->link_freq + * (pll->flags & CCS_PLL_FLAG_LANE_SPEED_MODEL ? + 1 : pll->csi2.lanes); + break; + default: + return -EINVAL; + } + + pll->pixel_rate_csi = + div_u64((uint64_t)op_sys_clk_freq_hz_sdr + * (pll->flags & CCS_PLL_FLAG_LANE_SPEED_MODEL ? + pll->csi2.lanes : 1) * PHY_CONST_DIV, + phy_const * pll->bits_per_pixel * l); + + /* Figure out limits for OP pre-pll divider based on extclk */ + dev_dbg(dev, "min / max op_pre_pll_clk_div: %u / %u\n", + op_lim_fr->min_pre_pll_clk_div, op_lim_fr->max_pre_pll_clk_div); + max_op_pre_pll_clk_div = + min_t(uint16_t, op_lim_fr->max_pre_pll_clk_div, + clk_div_even(pll->ext_clk_freq_hz / + op_lim_fr->min_pll_ip_clk_freq_hz)); + min_op_pre_pll_clk_div = + max_t(uint16_t, op_lim_fr->min_pre_pll_clk_div, + clk_div_even_up( + DIV_ROUND_UP(pll->ext_clk_freq_hz, + op_lim_fr->max_pll_ip_clk_freq_hz))); + dev_dbg(dev, "pre-pll check: min / max op_pre_pll_clk_div: %u / %u\n", + min_op_pre_pll_clk_div, max_op_pre_pll_clk_div); + + i = gcd(op_sys_clk_freq_hz_sdr, + pll->ext_clk_freq_hz << op_pix_ddr(pll->flags)); + mul = op_sys_clk_freq_hz_sdr / i; + div = (pll->ext_clk_freq_hz << op_pix_ddr(pll->flags)) / i; + dev_dbg(dev, "mul %u / div %u\n", mul, div); + + min_op_pre_pll_clk_div = + max_t(uint16_t, min_op_pre_pll_clk_div, + clk_div_even_up( + mul / + one_or_more( + DIV_ROUND_UP(op_lim_fr->max_pll_op_clk_freq_hz, + pll->ext_clk_freq_hz)))); + dev_dbg(dev, "pll_op check: min / max op_pre_pll_clk_div: %u / %u\n", + min_op_pre_pll_clk_div, max_op_pre_pll_clk_div); + + for (op_pll_fr->pre_pll_clk_div = min_op_pre_pll_clk_div; + op_pll_fr->pre_pll_clk_div <= max_op_pre_pll_clk_div; + op_pll_fr->pre_pll_clk_div += + (pll->flags & CCS_PLL_FLAG_EXT_IP_PLL_DIVIDER) ? 1 : + 2 - (op_pll_fr->pre_pll_clk_div & 1)) { + rval = ccs_pll_calculate_op(dev, lim, op_lim_fr, op_lim_bk, pll, + op_pll_fr, op_pll_bk, mul, div, + op_sys_clk_freq_hz_sdr, l, cphy, + phy_const); + if (rval) + continue; + + rval = check_fr_bounds(dev, lim, pll, + pll->flags & CCS_PLL_FLAG_DUAL_PLL ? + PLL_OP : PLL_VT); + if (rval) + continue; + + rval = check_bk_bounds(dev, lim, pll, PLL_OP); + if (rval) + continue; + + if (pll->flags & CCS_PLL_FLAG_DUAL_PLL) + break; + + ccs_pll_calculate_vt(dev, lim, op_lim_bk, pll, op_pll_fr, + op_pll_bk, cphy, phy_const); + + rval = check_bk_bounds(dev, lim, pll, PLL_VT); + if (rval) + continue; + rval = check_ext_bounds(dev, pll); + if (rval) + continue; + + break; + } + + if (rval) { + dev_dbg(dev, "unable to compute pre_pll divisor\n"); + + return rval; + } + + if (pll->flags & CCS_PLL_FLAG_DUAL_PLL) { + rval = ccs_pll_calculate_vt_tree(dev, lim, pll); + + if (rval) + return rval; + } + + print_pll(dev, pll); + + return 0; +} +EXPORT_SYMBOL_GPL(ccs_pll_calculate); + +MODULE_AUTHOR("Sakari Ailus <sakari.ailus@linux.intel.com>"); +MODULE_DESCRIPTION("Generic MIPI CCS/SMIA/SMIA++ PLL calculator"); +MODULE_LICENSE("GPL v2"); |