[PATCH 8/9] clk: sunxi-ng: sun6i: Use sigma-delta modulation for audio PLL

[Chen-Yu Tsai]

The audio blocks require specific clock rates. Until now we were using
the closest clock rate possible with integer N-M factors. This resulted
in audio playback being slightly slower than it should be.

The vendor kernel gets around this (for newer SoCs) by using sigma-delta
modulation to generate a fractional-N factor. As the PLL hardware is
identical in most chips, we can back port the settings from the newer
SoC, in this case the H3, onto the A31.

Signed-off-by: Chen-Yu Tsai <wens at csie.org>
---
 drivers/clk/sunxi-ng/ccu-sun6i-a31.c | 38 ++++++++++++++++++++++++------------
 1 file changed, 25 insertions(+), 13 deletions(-)

diff --git a/drivers/clk/sunxi-ng/ccu-sun6i-a31.c b/drivers/clk/sunxi-ng/ccu-sun6i-a31.c
index 241fb13f1c06..72b16ed1012b 100644
--- a/drivers/clk/sunxi-ng/ccu-sun6i-a31.c
+++ b/drivers/clk/sunxi-ng/ccu-sun6i-a31.c
@@ -31,6 +31,7 @@
 #include "ccu_nkmp.h"
 #include "ccu_nm.h"
 #include "ccu_phase.h"
+#include "ccu_sdm.h"
 
 #include "ccu-sun6i-a31.h"
 
@@ -48,18 +49,29 @@ static SUNXI_CCU_NKM_WITH_GATE_LOCK(pll_cpu_clk, "pll-cpu",
  * the base (2x, 4x and 8x), and one variable divider (the one true
  * pll audio).
  *
- * We don't have any need for the variable divider for now, so we just
- * hardcode it to match with the clock names
+ * With sigma-delta modulation for fractional-N on the audio PLL,
+ * we have to use specific dividers. This means the variable divider
+ * can no longer be used, as the audio codec requests the exact clock
+ * rates we support through this mechanism. So we now hard code the
+ * variable divider to 1. This means the clock rates will no longer
+ * match the clock names.
  */
 #define SUN6I_A31_PLL_AUDIO_REG	0x008
 
-static SUNXI_CCU_NM_WITH_GATE_LOCK(pll_audio_base_clk, "pll-audio-base",
-				   "osc24M", 0x008,
-				   8, 7,	/* N */
-				   0, 5,	/* M */
-				   BIT(31),	/* gate */
-				   BIT(28),	/* lock */
-				   CLK_SET_RATE_UNGATE);
+static struct ccu_sdm_setting pll_audio_sdm_table[] = {
+	{ .rate = 22579200, .pattern = 0xc0010d84, .m = 8, .n = 7 },
+	{ .rate = 24576000, .pattern = 0xc000ac02, .m = 14, .n = 14 },
+};
+
+static SUNXI_CCU_NM_WITH_SDM_GATE_LOCK(pll_audio_base_clk, "pll-audio-base",
+				       "osc24M", 0x008,
+				       8, 7,	/* N */
+				       0, 5,	/* M */
+				       pll_audio_sdm_table, BIT(24),
+				       0x284, BIT(31),
+				       BIT(31),	/* gate */
+				       BIT(28),	/* lock */
+				       CLK_SET_RATE_UNGATE);
 
 static SUNXI_CCU_NM_WITH_FRAC_GATE_LOCK(pll_video0_clk, "pll-video0",
 					"osc24M", 0x010,
@@ -950,9 +962,9 @@ static struct ccu_common *sun6i_a31_ccu_clks[] = {
 	&out_c_clk.common,
 };
 
-/* We hardcode the divider to 4 for now */
+/* We hardcode the divider to 1 for now */
 static CLK_FIXED_FACTOR(pll_audio_clk, "pll-audio",
-			"pll-audio-base", 4, 1, CLK_SET_RATE_PARENT);
+			"pll-audio-base", 1, 1, CLK_SET_RATE_PARENT);
 static CLK_FIXED_FACTOR(pll_audio_2x_clk, "pll-audio-2x",
 			"pll-audio-base", 2, 1, CLK_SET_RATE_PARENT);
 static CLK_FIXED_FACTOR(pll_audio_4x_clk, "pll-audio-4x",
@@ -1221,10 +1233,10 @@ static void __init sun6i_a31_ccu_setup(struct device_node *node)
 		return;
 	}
 
-	/* Force the PLL-Audio-1x divider to 4 */
+	/* Force the PLL-Audio-1x divider to 1 */
 	val = readl(reg + SUN6I_A31_PLL_AUDIO_REG);
 	val &= ~GENMASK(19, 16);
-	writel(val | (3 << 16), reg + SUN6I_A31_PLL_AUDIO_REG);
+	writel(val | (0 << 16), reg + SUN6I_A31_PLL_AUDIO_REG);
 
 	/* Force PLL-MIPI to MIPI mode */
 	val = readl(reg + SUN6I_A31_PLL_MIPI_REG);
-- 
2.14.2