diff mbox series

qcom: clk: clk-alpha-pll: fix rate setting for Stromer PLLs

Message ID 20240324-alpha-pll-fix-stromer-set-rate-v1-1-335b0b157219@gmail.com (mailing list archive)
State Superseded, archived
Headers show
Series qcom: clk: clk-alpha-pll: fix rate setting for Stromer PLLs | expand

Commit Message

Gabor Juhos March 24, 2024, 5:18 p.m. UTC
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-v2-1-6fe30ada2009@gmail.com
---
 drivers/clk/qcom/clk-alpha-pll.c | 4 ++++
 1 file changed, 4 insertions(+)


---
base-commit: 97483adf4c6181df2f3d8fe7c2aa057443298080
change-id: 20240324-alpha-pll-fix-stromer-set-rate-472376e624f0

Best regards,
diff mbox series

Patch

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);