linux-kernel - [PATCH v2 11/11] clk: qcom: gpucc-msm8998: Allow fabia gpupll0 rate setting

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Date:   Thu, 14 Jan 2021 23:10:59 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>
To:     linux-arm-msm@...r.kernel.org
Cc:     konrad.dybcio@...ainline.org, marijn.suijten@...ainline.org,
        martin.botka@...ainline.org, phone-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org, agross@...nel.org,
        bjorn.andersson@...aro.org, mturquette@...libre.com,
        sboyd@...nel.org, robh+dt@...nel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>
Subject: [PATCH v2 11/11] clk: qcom: gpucc-msm8998: Allow fabia gpupll0 rate setting

The GPU PLL0 is not a fixed PLL and the rate can be set on it:
this is necessary especially on boards which bootloader is setting
a very low rate on this PLL before booting Linux, which would be
unsuitable for postdividing to reach the maximum allowed Adreno GPU
frequency of 710MHz (or, actually, even 670MHz..) on this SoC.

To allow setting rates on the GPU PLL0, also define VCO boundaries
and set the CLK_SET_RATE_PARENT flag to the GPU PLL0 postdivider.

With this change, the Adreno GPU is now able to scale through all
the available frequencies.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
---
 drivers/clk/qcom/gpucc-msm8998.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/qcom/gpucc-msm8998.c b/drivers/clk/qcom/gpucc-msm8998.c
index 1a518c4915b4..fedfffaf0a8d 100644
--- a/drivers/clk/qcom/gpucc-msm8998.c
+++ b/drivers/clk/qcom/gpucc-msm8998.c
@@ -50,6 +50,11 @@ static struct clk_branch gpucc_cxo_clk = {
 	},
 };
 
+static struct pll_vco fabia_vco[] = {
+	{ 249600000, 2000000000, 0 },
+	{ 125000000, 1000000000, 1 },
+};
+
 static const struct clk_div_table post_div_table_fabia_even[] = {
 	{ 0x0, 1 },
 	{ 0x1, 2 },
@@ -61,11 +66,13 @@ static const struct clk_div_table post_div_table_fabia_even[] = {
 static struct clk_alpha_pll gpupll0 = {
 	.offset = 0x0,
 	.regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_FABIA],
+	.vco_table = fabia_vco,
+	.num_vco = ARRAY_SIZE(fabia_vco),
 	.clkr.hw.init = &(struct clk_init_data){
 		.name = "gpupll0",
 		.parent_hws = (const struct clk_hw *[]){ &gpucc_cxo_clk.clkr.hw },
 		.num_parents = 1,
-		.ops = &clk_alpha_pll_fixed_fabia_ops,
+		.ops = &clk_alpha_pll_fabia_ops,
 	},
 };
 
@@ -80,6 +87,7 @@ static struct clk_alpha_pll_postdiv gpupll0_out_even = {
 		.name = "gpupll0_out_even",
 		.parent_hws = (const struct clk_hw *[]){ &gpupll0.clkr.hw },
 		.num_parents = 1,
+		.flags = CLK_SET_RATE_PARENT,
 		.ops = &clk_alpha_pll_postdiv_fabia_ops,
 	},
 };
-- 
2.29.2