From cab27256e8b3a6529faab9fc00e40fcf60b16590 Mon Sep 17 00:00:00 2001 From: Sakari Ailus Date: Fri, 26 Jun 2020 11:56:47 +0200 Subject: media: ccs-pll: Begin calculation from OP system clock frequency The OP system clock frequency defines the CSI-2 bus clock frequency, not the PLL output clock frequency. Both values were overwritten in the end, but the wrong limit value was used for the OP system clock frequency, possibly leading to too high frequencies being used. Also remove now duplicated calculation of OP system clock frequency later in the PLL calculator. Signed-off-by: Sakari Ailus Signed-off-by: Mauro Carvalho Chehab --- drivers/media/i2c/ccs-pll.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) diff --git a/drivers/media/i2c/ccs-pll.c b/drivers/media/i2c/ccs-pll.c index c6435ed0597e..584be36f8c66 100644 --- a/drivers/media/i2c/ccs-pll.c +++ b/drivers/media/i2c/ccs-pll.c @@ -247,10 +247,6 @@ __ccs_pll_calculate(struct device *dev, const struct ccs_pll_limits *lim, op_pll_fr->pll_op_clk_freq_hz = op_pll_fr->pll_ip_clk_freq_hz * op_pll_fr->pll_multiplier; - /* Derive pll_op_clk_freq_hz. */ - op_pll_bk->sys_clk_freq_hz = - op_pll_fr->pll_op_clk_freq_hz / op_pll_bk->sys_clk_div; - op_pll_bk->pix_clk_div = pll->bits_per_pixel; dev_dbg(dev, "op_pix_clk_div: %u\n", op_pll_bk->pix_clk_div); @@ -432,7 +428,7 @@ int ccs_pll_calculate(struct device *dev, const struct ccs_pll_limits *lim, switch (pll->bus_type) { case CCS_PLL_BUS_TYPE_CSI2_DPHY: /* CSI transfers 2 bits per clock per lane; thus times 2 */ - op_pll_fr->pll_op_clk_freq_hz = pll->link_freq * 2 + op_pll_bk->sys_clk_freq_hz = pll->link_freq * 2 * (pll->csi2.lanes / lane_op_clock_ratio); break; default: @@ -454,8 +450,8 @@ int ccs_pll_calculate(struct device *dev, const struct ccs_pll_limits *lim, 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_pll_fr->pll_op_clk_freq_hz, pll->ext_clk_freq_hz); - mul = op_pll_fr->pll_op_clk_freq_hz / i; + i = gcd(op_pll_bk->sys_clk_freq_hz, pll->ext_clk_freq_hz); + mul = op_pll_bk->sys_clk_freq_hz / i; div = pll->ext_clk_freq_hz / i; dev_dbg(dev, "mul %u / div %u\n", mul, div); @@ -463,7 +459,7 @@ int ccs_pll_calculate(struct device *dev, const struct ccs_pll_limits *lim, max_t(uint16_t, min_op_pre_pll_clk_div, clk_div_even_up( DIV_ROUND_UP(mul * pll->ext_clk_freq_hz, - op_lim_fr->max_pll_op_clk_freq_hz))); + op_lim_bk->max_sys_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); -- cgit v1.2.3