The clk_alpha_pll_stromer_set_rate() function writes inproper values into the ALPHA_VAL{,_U} registers which results in wrong clock rates when the alpha value is used.
The broken behaviour can be seen on IPQ5018 for example, when dynamic scaling sets the CPU frequency to 800000 KHz. In this case the CPU cores are running only at 792031 KHz:
# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq 800000 # cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq 792031
This happens because the function ignores the fact that the alpha value calculated by the alpha_pll_round_rate() function is only 32 bits wide which must be extended to 40 bits if it is used on a hardware which supports 40 bits wide values.
Extend the clk_alpha_pll_stromer_set_rate() function to convert the alpha value to 40 bits before wrinting that into the registers in order to ensure that the hardware really uses the requested rate.
After the change the CPU frequency is correct:
# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq 800000 # cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq 800000
Cc: stable@vger.kernel.org Fixes: e47a4f55f240 ("clk: qcom: clk-alpha-pll: Add support for Stromer PLLs") Signed-off-by: Gabor Juhos j4g8y7@gmail.com --- Based on v6.8. --- Based on v6.8.
Depends on the following patch: https://lore.kernel.org/r/20240315-apss-ipq-pll-ipq5018-hang-v2-1-6fe30ada20... --- drivers/clk/qcom/clk-alpha-pll.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c index 05898d2a8b22c..4f5dba44411f6 100644 --- a/drivers/clk/qcom/clk-alpha-pll.c +++ b/drivers/clk/qcom/clk-alpha-pll.c @@ -2474,6 +2474,10 @@ static int clk_alpha_pll_stromer_set_rate(struct clk_hw *hw, unsigned long rate, rate = alpha_pll_round_rate(rate, prate, &l, &a, ALPHA_REG_BITWIDTH);
regmap_write(pll->clkr.regmap, PLL_L_VAL(pll), l); + + if (ALPHA_REG_BITWIDTH > ALPHA_BITWIDTH) + a <<= ALPHA_REG_BITWIDTH - ALPHA_BITWIDTH; + regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL(pll), a); regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL_U(pll), a >> ALPHA_BITWIDTH);
--- base-commit: 97483adf4c6181df2f3d8fe7c2aa057443298080 change-id: 20240324-alpha-pll-fix-stromer-set-rate-472376e624f0
Best regards,