From beb90a53f3f4d10cdab52690f96264655b325a98 Mon Sep 17 00:00:00 2001 From: Philipp Tomsich Date: Thu, 20 Apr 2017 22:05:50 +0200 Subject: [PATCH] rockchip: clk: rk3399: fix off-by one during rate calculation in i2c/spi_set_rate For the RK3399, i2c_set_rate (and by extension: our spi_set_rate, which had been mindlessly following the template of the i2c_set_rate implementation) miscalculates the rate returned due to a off-by-one error resulting from the following sequence of events: 1. calculates 'src_div := src_freq / target_freq' 2. stores 'src_div - 1' into the register (the actual divider applied in hardware is biased by adding 1) 3. returns the result of the DIV_RATE(src_freq, src_div) macro, which expects the (decremented) divider from the hardware-register and implictly adds 1 (i.e. 'DIV_RATE(freq, div) := freq / (div + 1)') This can be observed with the SPI driver, which sets a rate of 99MHz based on the GPLL frequency of 594MHz: the hardware generates a clock of 99MHz (src_div is 6, the bitfield in the register correctly reads 5), but reports a frequency of 84MHz (594 / 7) on return. To fix, we have two options: * either we bias (i.e. "DIV_RATE(GPLL, src_div - 1)"), which doesn't make for a particularily nice read * we simply call the i2c/spi_get_rate function (introducing additional overhead for the additional register-read), which reads the divider from the register and then passes it through the DIV_RATE macro Given that this code is not time-critical, the more readable solution (i.e. calling the appropriate get_rate function) is implemented in this change. Signed-off-by: Philipp Tomsich Tested-by: Klaus Goger Acked-by: Simon Glass --- drivers/clk/rockchip/clk_rk3399.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/clk/rockchip/clk_rk3399.c b/drivers/clk/rockchip/clk_rk3399.c index 1c53ca247e..72395e2dd4 100644 --- a/drivers/clk/rockchip/clk_rk3399.c +++ b/drivers/clk/rockchip/clk_rk3399.c @@ -606,7 +606,7 @@ static ulong rk3399_i2c_set_clk(struct rk3399_cru *cru, ulong clk_id, uint hz) return -EINVAL; } - return DIV_TO_RATE(GPLL_HZ, src_clk_div); + return rk3399_i2c_get_clk(cru, clk_id); } /* @@ -695,8 +695,7 @@ static ulong rk3399_spi_set_clk(struct rk3399_cru *cru, ulong clk_id, uint hz) ((src_clk_div << spiclk->div_shift) | (CLK_SPI_PLL_SEL_GPLL << spiclk->sel_shift))); - - return DIV_TO_RATE(GPLL_HZ, src_clk_div); + return rk3399_spi_get_clk(cru, clk_id); } static ulong rk3399_vop_set_clk(struct rk3399_cru *cru, ulong clk_id, u32 hz) -- 2.25.1