clk: qcom: gcc-msm8998: Add Q6 BIMC and LPASS core, ADSP SMMU clocks

Add the Q6 BIMC, LPASS core/adsp SMMU clocks to support audio related
functionality on MSM8998 and APQ variants.

As a final step to entirely enable the required clock tree for the
lpass iommu and audio dsp, add the lpass core/adsp GDSCs.

As a side note, it was found out that disabling the lpass core GDSC
at any time would cause a system lockup (and reboot): disabling
this GDSC will leave the lpass iommu completely unclocked, losing
its state entirely - including the secure contexts that have been
previously set-up from the bootloader/TrustZone.
Losing this IOMMU configuration will trigger a hypervisor fault,
which will reboot the system; the only workaround for this issue
is to declare the lpass core gdsc as always-on.

It should also not be forgotten that this is all about firmware and
there may be a version of it that doesn't enable this GDSC at all
before booting Linux, which is the reason why this specific declaration
wasn't simply omitted.

Signed-off-by: AngeloGioacchino Del Regno <[email protected]>
Signed-off-by: Marc Gonzalez <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Bjorn Andersson <[email protected]>

Author: kholk

drivers/clk/qcom/gcc-msm8998.c

@@ -2922,6 +2922,43 @@ static struct clk_branch ssc_cnoc_ahbs_clk = {
 	},
 };
 
+static struct clk_branch hlos1_vote_lpass_core_smmu_clk = {
+	.halt_reg = 0x7D010,
+	.clkr = {
+		.enable_reg = 0x7D010,
+		.enable_mask = BIT(0),
+		.hw.init = &(struct clk_init_data) {
+			.name = "hlos1_vote_lpass_core_smmu_clk",
+			.ops = &clk_branch2_ops,
+		},
+	},
+};
+
+static struct clk_branch hlos1_vote_lpass_adsp_smmu_clk = {
+	.halt_reg = 0x7D014,
+	.clkr = {
+		.enable_reg = 0x7D014,
+		.enable_mask = BIT(0),
+		.hw.init = &(struct clk_init_data) {
+			.name = "hlos1_vote_lpass_adsp_smmu_clk",
+			.ops = &clk_branch2_ops,
+		},
+	},
+};
+
+static struct clk_branch gcc_mss_q6_bimc_axi_clk = {
+	.halt_reg = 0x8A040,
+	.clkr = {
+		.enable_reg = 0x8A040,
+		.enable_mask = BIT(0),
+		.hw.init = &(struct clk_init_data) {
+			.name = "gcc_mss_q6_bimc_axi_clk",
+			.flags = CLK_IS_CRITICAL,
+			.ops = &clk_branch2_ops,
+		},
+	},
+};
+
 static struct gdsc pcie_0_gdsc = {
 	.gdscr = 0x6b004,
 	.gds_hw_ctrl = 0x0,
@@ -2953,6 +2990,26 @@ static struct gdsc usb_30_gdsc = {
 	.flags = VOTABLE,
 };
 
+static struct gdsc hlos1_vote_lpass_adsp = {
+	.gdscr = 0x7d034,
+	.gds_hw_ctrl = 0x0,
+	.pd = {
+		.name = "lpass_adsp_gdsc",
+	},
+	.pwrsts = PWRSTS_OFF_ON,
+	.flags = VOTABLE,
+};
+
+static struct gdsc hlos1_vote_lpass_core = {
+	.gdscr = 0x7d038,
+	.gds_hw_ctrl = 0x0,
+	.pd = {
+		.name = "lpass_core_gdsc",
+	},
+	.pwrsts = PWRSTS_OFF_ON,
+	.flags = ALWAYS_ON,
+};
+
 static struct clk_regmap *gcc_msm8998_clocks[] = {
 	[BLSP1_QUP1_I2C_APPS_CLK_SRC] = &blsp1_qup1_i2c_apps_clk_src.clkr,
 	[BLSP1_QUP1_SPI_APPS_CLK_SRC] = &blsp1_qup1_spi_apps_clk_src.clkr,
@@ -3133,12 +3190,17 @@ static struct clk_regmap *gcc_msm8998_clocks[] = {
 	[GCC_MMSS_GPLL0_DIV_CLK] = &gcc_mmss_gpll0_div_clk.clkr,
 	[GCC_GPU_GPLL0_DIV_CLK] = &gcc_gpu_gpll0_div_clk.clkr,
 	[GCC_GPU_GPLL0_CLK] = &gcc_gpu_gpll0_clk.clkr,
+	[HLOS1_VOTE_LPASS_CORE_SMMU_CLK] = &hlos1_vote_lpass_core_smmu_clk.clkr,
+	[HLOS1_VOTE_LPASS_ADSP_SMMU_CLK] = &hlos1_vote_lpass_adsp_smmu_clk.clkr,
+	[GCC_MSS_Q6_BIMC_AXI_CLK] = &gcc_mss_q6_bimc_axi_clk.clkr,
 };
 
 static struct gdsc *gcc_msm8998_gdscs[] = {
 	[PCIE_0_GDSC] = &pcie_0_gdsc,
 	[UFS_GDSC] = &ufs_gdsc,
 	[USB_30_GDSC] = &usb_30_gdsc,
+	[LPASS_ADSP_GDSC] = &hlos1_vote_lpass_adsp,
+	[LPASS_CORE_GDSC] = &hlos1_vote_lpass_core,
 };
 
 static const struct qcom_reset_map gcc_msm8998_resets[] = {