linux-kernel - [PATCH 2/7] clk: qcom: ipq8074: disable USB GDSC-s SW

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Date:   Mon, 25 Apr 2022 20:22:44 +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 2/7] clk: qcom: ipq8074: disable USB GDSC-s SW_COLLAPSE

Like in IPQ6018 Qualcomm intentionally disables the SW_COLLAPSE on the USB
GDSC-s in the downstream 5.4 kernel.

This could potentially be better handled by utilizing the GDSC driver, but
I am not familiar with it nor do I have datasheets.

Signed-off-by: Robert Marko <robimarko@...il.com>
---
 drivers/clk/qcom/gcc-ipq8074.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/clk/qcom/gcc-ipq8074.c b/drivers/clk/qcom/gcc-ipq8074.c
index 2ebd1462db78..65249a03a672 100644
--- a/drivers/clk/qcom/gcc-ipq8074.c
+++ b/drivers/clk/qcom/gcc-ipq8074.c
@@ -4806,6 +4806,11 @@ static int gcc_ipq8074_probe(struct platform_device *pdev)
 	if (IS_ERR(regmap))
 		return PTR_ERR(regmap);
 
+	/* Disable SW_COLLAPSE for USB0 GDSCR */
+	regmap_update_bits(regmap, 0x3e078, BIT(0), 0x0);
+	/* Disable SW_COLLAPSE for USB1 GDSCR */
+	regmap_update_bits(regmap, 0x3f078, BIT(0), 0x0);
+
 	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