linux-kernel - [PATCH 3/7] clk: qcom: ipq8074: SW workaround for UBI32 PLL lock

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Message-Id: <20220425182249.2753690-3-robimarko@gmail.com>
Date:   Mon, 25 Apr 2022 20:22:45 +0200
From:   Robert Marko <robimarko@...il.com>
To:     agross@...nel.org, bjorn.andersson@...aro.org,
        mturquette@...libre.com, sboyd@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, absahu@...eaurora.org,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Cc:     Robert Marko <robimarko@...il.com>
Subject: [PATCH 3/7] clk: qcom: ipq8074: SW workaround for UBI32 PLL lock

UBI32 Huayra PLL fails to lock in 5 us in some SoC silicon and thus it
will cause the wait_for_pll() to timeout and thus return the error
indicating that the PLL failed to lock.

This is bug in Huayra PLL HW for which SW workaround
is to set bit 26 of TEST_CTL register.

This is ported from the QCA 5.4 based downstream kernel.

Fixes: b8e7e519625f ("clk: qcom: ipq8074: add remaining PLL’s")
Signed-off-by: Robert Marko <robimarko@...il.com>
---
 drivers/clk/qcom/gcc-ipq8074.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/clk/qcom/gcc-ipq8074.c b/drivers/clk/qcom/gcc-ipq8074.c
index 65249a03a672..969b38d4ba08 100644
--- a/drivers/clk/qcom/gcc-ipq8074.c
+++ b/drivers/clk/qcom/gcc-ipq8074.c
@@ -4811,6 +4811,9 @@ static int gcc_ipq8074_probe(struct platform_device *pdev)
 	/* Disable SW_COLLAPSE for USB1 GDSCR */
 	regmap_update_bits(regmap, 0x3f078, BIT(0), 0x0);
 
+	/* SW Workaround for UBI32 Huayra PLL */
+	regmap_update_bits(regmap, 0x2501c, BIT(26), BIT(26));
+
 	clk_alpha_pll_configure(&ubi32_pll_main, regmap, &ubi32_pll_config);
 	clk_alpha_pll_configure(&nss_crypto_pll_main, regmap,
 				&nss_crypto_pll_config);
-- 
2.35.1