[PATCH 12/13] clk: qcom: cpu-8996: change setup sequence to follow vendor kernel

[Dmitry Baryshkov <dmitry.baryshkov@linaro.org>]

Add missing register writes to CPU clocks setup procedure. This makes it
follow the setup procedure used in msm-3.18 kernel.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/clk/qcom/clk-cpu-8996.c | 31 +++++++++++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/qcom/clk-cpu-8996.c b/drivers/clk/qcom/clk-cpu-8996.c
index b53cddc4bca3..78a18b95c48b 100644
--- a/drivers/clk/qcom/clk-cpu-8996.c
+++ b/drivers/clk/qcom/clk-cpu-8996.c
@@ -76,10 +76,16 @@ enum _pmux_input {
 #define PWRCL_REG_OFFSET 0x0
 #define PERFCL_REG_OFFSET 0x80000
 #define MUX_OFFSET	0x40
+#define CLK_CTL_OFFSET 0x44
+#define CLK_CTL_AUTO_CLK_SEL BIT(8)
 #define ALT_PLL_OFFSET	0x100
 #define SSSCTL_OFFSET 0x160
+#define PSCTL_OFFSET 0x164
 
 #define PMUX_MASK	0x3
+#define MUX_AUTO_CLK_SEL_ALWAYS_ON_MASK GENMASK(5, 4)
+#define MUX_AUTO_CLK_SEL_ALWAYS_ON_GPLL0_SEL \
+	FIELD_PREP(MUX_AUTO_CLK_SEL_ALWAYS_ON_MASK, 0x03)
 
 static const u8 prim_pll_regs[PLL_OFF_MAX_REGS] = {
 	[PLL_OFF_L_VAL] = 0x04,
@@ -439,6 +445,14 @@ static int qcom_cpu_clk_msm8996_register_clks(struct device *dev,
 	/* Ensure write goes through before PLLs are reconfigured */
 	udelay(5);
 
+	/* Set the auto clock sel always-on source to GPLL0/2 (300MHz) */
+	regmap_update_bits(regmap, PWRCL_REG_OFFSET + MUX_OFFSET,
+			   MUX_AUTO_CLK_SEL_ALWAYS_ON_MASK,
+			   MUX_AUTO_CLK_SEL_ALWAYS_ON_GPLL0_SEL);
+	regmap_update_bits(regmap, PERFCL_REG_OFFSET + MUX_OFFSET,
+			   MUX_AUTO_CLK_SEL_ALWAYS_ON_MASK,
+			   MUX_AUTO_CLK_SEL_ALWAYS_ON_GPLL0_SEL);
+
 	clk_alpha_pll_configure(&pwrcl_pll, regmap, &hfpll_config);
 	clk_alpha_pll_configure(&perfcl_pll, regmap, &hfpll_config);
 	clk_alpha_pll_configure(&pwrcl_alt_pll, regmap, &altpll_config);
@@ -447,11 +461,24 @@ static int qcom_cpu_clk_msm8996_register_clks(struct device *dev,
 	/* Wait for PLL(s) to lock */
         udelay(50);
 
+	/* Enable auto clock selection for both clusters */
+	regmap_update_bits(regmap, PWRCL_REG_OFFSET + CLK_CTL_OFFSET,
+			   CLK_CTL_AUTO_CLK_SEL, CLK_CTL_AUTO_CLK_SEL);
+	regmap_update_bits(regmap, PERFCL_REG_OFFSET + CLK_CTL_OFFSET,
+			   CLK_CTL_AUTO_CLK_SEL, CLK_CTL_AUTO_CLK_SEL);
+
+	/* Ensure write goes through before muxes are switched */
+	udelay(5);
+
 	qcom_cpu_clk_msm8996_acd_init(regmap);
 
+	/* Pulse swallower and soft-start settings */
+	regmap_write(regmap, PWRCL_REG_OFFSET + PSCTL_OFFSET, 0x00030005);
+	regmap_write(regmap, PERFCL_REG_OFFSET + PSCTL_OFFSET, 0x00030005);
+
 	/* Switch clusters to use the ACD leg */
-	regmap_write(regmap, PWRCL_REG_OFFSET + MUX_OFFSET, 0x2);
-	regmap_write(regmap, PERFCL_REG_OFFSET + MUX_OFFSET, 0x2);
+	regmap_write(regmap, PWRCL_REG_OFFSET + MUX_OFFSET, 0x32);
+	regmap_write(regmap, PERFCL_REG_OFFSET + MUX_OFFSET, 0x32);
 
 	for (i = 0; i < ARRAY_SIZE(cpu_msm8996_hw_clks); i++) {
 		ret = devm_clk_hw_register(dev, cpu_msm8996_hw_clks[i]);
-- 
2.30.2