linux-kernel - [PATCH] clk: qcom: clk-alpha-pll: set ALPHA

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Date: Wed, 08 May 2024 22:34:14 +0200
From: Gabor Juhos <j4g8y7@...il.com>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, Kathiravan T <quic_kathirav@...cinc.com>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
 Varadarajan Narayanan <quic_varada@...cinc.com>
Cc: linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Gabor Juhos <j4g8y7@...il.com>
Subject: [PATCH] clk: qcom: clk-alpha-pll: set ALPHA_EN bit for Stromer
 Plus PLLs

The clk_alpha_pll_stromer_plus_set_rate() function does not
sets the ALPHA_EN bit in the USER_CTL register, so setting
rates which requires using alpha mode works only if the bit
gets set already prior calling the function.

Extend the function to set the ALPHA_EN bit in order to allow
using fractional rates regardless whether the bit gets set
previously or not.

Fixes: 84da48921a97 ("clk: qcom: clk-alpha-pll: introduce stromer plus ops")
Signed-off-by: Gabor Juhos <j4g8y7@...il.com>
---
Based on 'qcom-clk-for-6.10'
---

---
 drivers/clk/qcom/clk-alpha-pll.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
index d4227909d1fe..c51647e37df8 100644
--- a/drivers/clk/qcom/clk-alpha-pll.c
+++ b/drivers/clk/qcom/clk-alpha-pll.c
@@ -2574,6 +2574,9 @@ static int clk_alpha_pll_stromer_plus_set_rate(struct clk_hw *hw,
 	regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL_U(pll),
 					a >> ALPHA_BITWIDTH);
 
+	regmap_update_bits(pll->clkr.regmap, PLL_USER_CTL(pll),
+			   PLL_ALPHA_EN, PLL_ALPHA_EN);
+
 	regmap_write(pll->clkr.regmap, PLL_MODE(pll), PLL_BYPASSNL);
 
 	/* Wait five micro seconds or more */

---
base-commit: 3c5b3e17b8fd1f1add5a9477306c355fab126977
change-id: 20240508-stromer-plus-alpha-en-0a4a4c6df28c

Best regards,
-- 
Gabor Juhos <j4g8y7@...il.com>