clk: qcom: apss-ipq-pll: use stromer ops for IPQ5018 to fix boot failure

Booting v6.8 results in a hang on various IPQ5018 based boards.
Investigating the problem showed that the hang happens when the
clk_alpha_pll_stromer_plus_set_rate() function tries to write
into the PLL_MODE register of the APSS PLL.

Checking the downstream code revealed that it uses [1] stromer
specific operations for IPQ5018, whereas in the current code
the stromer plus specific operations are used.

The ops in the 'ipq_pll_stromer_plus' clock definition can't be
changed since that is needed for IPQ5332, so add a new alpha pll
clock declaration which uses the correct stromer ops and use this
new clock for IPQ5018 to avoid the boot failure.

Also, change pll_type in 'ipq5018_pll_data' to
CLK_ALPHA_PLL_TYPE_STROMER to better reflect that it is a Stromer
PLL and change the apss_ipq_pll_probe() function accordingly.

1. https://git.codelinaro.org/clo/qsdk/oss/kernel/linux-ipq-5.4/-/blob/NHSS.QSDK.12.4/drivers/clk/qcom/apss-ipq5018.c#L67

Cc: stable@vger.kernel.org
Fixes: 50492f929486 ("clk: qcom: apss-ipq-pll: add support for IPQ5018")
Signed-off-by: Gabor Juhos <j4g8y7@gmail.com>
Tested-by: Kathiravan Thirumoorthy <quic_kathirav@quicinc.com>
Reviewed-by: Kathiravan Thirumoorthy <quic_kathirav@quicinc.com>
Link: https://lore.kernel.org/r/20240315-apss-ipq-pll-ipq5018-hang-v2-1-6fe30ada2009@gmail.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

1 files changed, 27 insertions, 3 deletions

diff --git a/drivers/clk/qcom/apss-ipq-pll.c b/drivers/clk/qcom/apss-ipq-pll.c
index 678b805f13d4..dfffec2f06ae 100644
--- a/drivers/clk/qcom/apss-ipq-pll.c
+++ b/drivers/clk/qcom/apss-ipq-pll.c
@@ -55,6 +55,29 @@ static struct clk_alpha_pll ipq_pll_huayra = {
 	},
 };
 
+static struct clk_alpha_pll ipq_pll_stromer = {
+	.offset = 0x0,
+	/*
+	 * Reuse CLK_ALPHA_PLL_TYPE_STROMER_PLUS register offsets.
+	 * Although this is a bit confusing, but the offset values
+	 * are correct nevertheless.
+	 */
+	.regs = ipq_pll_offsets[CLK_ALPHA_PLL_TYPE_STROMER_PLUS],
+	.flags = SUPPORTS_DYNAMIC_UPDATE,
+	.clkr = {
+		.enable_reg = 0x0,
+		.enable_mask = BIT(0),
+		.hw.init = &(const struct clk_init_data) {
+			.name = "a53pll",
+			.parent_data = &(const struct clk_parent_data) {
+				.fw_name = "xo",
+			},
+			.num_parents = 1,
+			.ops = &clk_alpha_pll_stromer_ops,
+		},
+	},
+};
+
 static struct clk_alpha_pll ipq_pll_stromer_plus = {
 	.offset = 0x0,
 	.regs = ipq_pll_offsets[CLK_ALPHA_PLL_TYPE_STROMER_PLUS],
@@ -144,8 +167,8 @@ struct apss_pll_data {
 };
 
 static const struct apss_pll_data ipq5018_pll_data = {
-	.pll_type = CLK_ALPHA_PLL_TYPE_STROMER_PLUS,
-	.pll = &ipq_pll_stromer_plus,
+	.pll_type = CLK_ALPHA_PLL_TYPE_STROMER,
+	.pll = &ipq_pll_stromer,
 	.pll_config = &ipq5018_pll_config,
 };
 
@@ -203,7 +226,8 @@ static int apss_ipq_pll_probe(struct platform_device *pdev)
 
 	if (data->pll_type == CLK_ALPHA_PLL_TYPE_HUAYRA)
 		clk_alpha_pll_configure(data->pll, regmap, data->pll_config);
-	else if (data->pll_type == CLK_ALPHA_PLL_TYPE_STROMER_PLUS)
+	else if (data->pll_type == CLK_ALPHA_PLL_TYPE_STROMER ||
+		 data->pll_type == CLK_ALPHA_PLL_TYPE_STROMER_PLUS)
 		clk_stromer_pll_configure(data->pll, regmap, data->pll_config);
 
 	ret = devm_clk_register_regmap(dev, &data->pll->clkr);