linux-kernel - [PATCH 5.15 451/779] clk: qcom: ipq8074: SW workaround for UBI32 PLL lock

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Date:   Mon, 15 Aug 2022 20:01:35 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Robert Marko <robimarko@...il.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 451/779] clk: qcom: ipq8074: SW workaround for UBI32 PLL lock

From: Robert Marko <robimarko@...il.com>

[ Upstream commit 3401ea2856ef84f39b75f0dc5ebcaeda81cb90ec ]

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>
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Link: https://lore.kernel.org/r/20220515210048.483898-2-robimarko@gmail.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 1a5141da7e23..b4291ba53c78 100644
--- a/drivers/clk/qcom/gcc-ipq8074.c
+++ b/drivers/clk/qcom/gcc-ipq8074.c
@@ -4805,6 +4805,9 @@ static int gcc_ipq8074_probe(struct platform_device *pdev)
 	if (IS_ERR(regmap))
 		return PTR_ERR(regmap);
 
+	/* 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