clk: sunxi-ng: sun8i: a83t: Use sigma-delta modulation for audio PLL

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. This patch copies the
parameters for the A83T.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

diff --git a/drivers/clk/sunxi-ng/ccu-sun8i-a83t.c b/drivers/clk/sunxi-ng/ccu-sun8i-a83t.c
index 06b69e4..04a9c33 100644 (file)
--- a/drivers/clk/sunxi-ng/ccu-sun8i-a83t.c
+++ b/drivers/clk/sunxi-ng/ccu-sun8i-a83t.c
@@ -76,17 +76,26 @@ static struct ccu_mult pll_c1cpux_clk = {
  */
 #define SUN8I_A83T_PLL_AUDIO_REG       0x008
 
+/* clock rates doubled for post divider */
+static struct ccu_sdm_setting pll_audio_sdm_table[] = {
+       { .rate = 45158400, .pattern = 0xc00121ff, .m = 29, .n = 54 },
+       { .rate = 49152000, .pattern = 0xc000e147, .m = 30, .n = 61 },
+};
+
 static struct ccu_nm pll_audio_clk = {
        .enable         = BIT(31),
        .lock           = BIT(2),
        .n              = _SUNXI_CCU_MULT_OFFSET_MIN_MAX(8, 8, 0, 12, 0),
        .m              = _SUNXI_CCU_DIV(0, 6),
        .fixed_post_div = 2,
+       .sdm            = _SUNXI_CCU_SDM(pll_audio_sdm_table, BIT(24),
+                                        0x284, BIT(31)),
        .common         = {
                .reg            = SUN8I_A83T_PLL_AUDIO_REG,
                .lock_reg       = CCU_SUN8I_A83T_LOCK_REG,
                .features       = CCU_FEATURE_LOCK_REG |
-                                 CCU_FEATURE_FIXED_POSTDIV,
+                                 CCU_FEATURE_FIXED_POSTDIV |
+                                 CCU_FEATURE_SIGMA_DELTA_MOD,
                .hw.init        = CLK_HW_INIT("pll-audio", "osc24M",
                                              &ccu_nm_ops, CLK_SET_RATE_UNGATE),
        },