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Date:   Thu, 11 Apr 2019 09:39:06 +0000
From:   "S.j. Wang" <shengjiu.wang@....com>
To:     "timur@...nel.org" <timur@...nel.org>,
        "nicoleotsuka@...il.com" <nicoleotsuka@...il.com>,
        "Xiubo.Lee@...il.com" <Xiubo.Lee@...il.com>,
        "festevam@...il.com" <festevam@...il.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>
CC:     "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH V2 1/2] ASoC: fsl_asrc: replace the process_option table with
 function

When we want to support more sample rate, for example 12kHz/24kHz
we need update the process_option table, if we want to support more
sample rate next time, the table need to be updated again. which
is not flexible.

We got a function fsl_asrc_sel_proc to replace the table, which can
give the pre-processing and post-processing options according to
the sample rate.

Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
---
 sound/soc/fsl/fsl_asrc.c | 87 +++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 67 insertions(+), 20 deletions(-)

diff --git a/sound/soc/fsl/fsl_asrc.c b/sound/soc/fsl/fsl_asrc.c
index 0b937924d2e4..5857d383d962 100644
--- a/sound/soc/fsl/fsl_asrc.c
+++ b/sound/soc/fsl/fsl_asrc.c
@@ -26,24 +26,6 @@
 #define pair_dbg(fmt, ...) \
 	dev_dbg(&asrc_priv->pdev->dev, "Pair %c: " fmt, 'A' + index, ##__VA_ARGS__)
 
-/* Sample rates are aligned with that defined in pcm.h file */
-static const u8 process_option[][12][2] = {
-	/* 8kHz 11.025kHz 16kHz 22.05kHz 32kHz 44.1kHz 48kHz   64kHz   88.2kHz 96kHz   176kHz  192kHz */
-	{{0, 1}, {0, 1}, {0, 1}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0},},	/* 5512Hz */
-	{{0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0},},	/* 8kHz */
-	{{0, 2}, {0, 1}, {0, 1}, {0, 1}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0},},	/* 11025Hz */
-	{{1, 2}, {0, 2}, {0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0},},	/* 16kHz */
-	{{1, 2}, {1, 2}, {0, 2}, {0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0},},	/* 22050Hz */
-	{{1, 2}, {2, 1}, {2, 1}, {0, 2}, {0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 0}, {0, 0}, {0, 0},},	/* 32kHz */
-	{{2, 2}, {2, 2}, {2, 1}, {2, 1}, {0, 2}, {0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 0}, {0, 0},},	/* 44.1kHz */
-	{{2, 2}, {2, 2}, {2, 1}, {2, 1}, {0, 2}, {0, 2}, {0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 0}, {0, 0},},	/* 48kHz */
-	{{2, 2}, {2, 2}, {2, 2}, {2, 1}, {1, 2}, {0, 2}, {0, 2}, {0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 0},},	/* 64kHz */
-	{{2, 2}, {2, 2}, {2, 2}, {2, 2}, {1, 2}, {1, 2}, {1, 2}, {1, 1}, {1, 1}, {1, 1}, {1, 1}, {1, 1},},	/* 88.2kHz */
-	{{2, 2}, {2, 2}, {2, 2}, {2, 2}, {1, 2}, {1, 2}, {1, 2}, {1, 1}, {1, 1}, {1, 1}, {1, 1}, {1, 1},},	/* 96kHz */
-	{{2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 1}, {2, 1}, {2, 1}, {2, 1}, {2, 1},},	/* 176kHz */
-	{{2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 1}, {2, 1}, {2, 1}, {2, 1}, {2, 1},},	/* 192kHz */
-};
-
 /* Corresponding to process_option */
 static int supported_input_rate[] = {
 	5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000, 88200,
@@ -79,6 +61,63 @@
 
 static unsigned char *clk_map[2];
 
+/*
+ * Select the pre-processing and post-processing options
+ *
+ * Fsin: input sample rate
+ * Fsout: output sample rate
+ * pre_proc: return value for pre-processing option
+ * post_proc: return value for post-processing option
+ */
+static int fsl_asrc_sel_proc(int Fsin, int Fsout, int *pre_proc, int *post_proc)
+{
+	bool det_out_op2_cond;
+	bool det_out_op0_cond;
+
+	/* Codition for selection of post-processing */
+	det_out_op2_cond = (((Fsin * 15 > Fsout * 16) & (Fsout < 56000)) |
+					((Fsin > 56000) & (Fsout < 56000)));
+	det_out_op0_cond = (Fsin * 23 < Fsout * 8);
+
+	/*
+	 * unsupported case: Tsout>16.125*Tsin, and Tsout>8.125*Tsin.
+	 * Tsout>16.125*Tsin -> Fsin * 8 > 129 * Fsout
+	 * Tsout>8.125*Tsin  -> Fsin * 8 > 65 * Fsout
+	 * Tsout>4.125*Tsin  -> Fsin * 8 > 33 * Fsout
+	 * Tsout>1.875*Tsin  -> Fsin * 8 > 15 * Fsout
+	 */
+	if (Fsin * 8 > 129 * Fsout)
+		*pre_proc = 5;
+	else if (Fsin * 8 > 65 * Fsout)
+		*pre_proc = 4;
+	else if (Fsin * 8 > 33 * Fsout)
+		*pre_proc = 2;
+	else if (Fsin * 8 > 15 * Fsout) {
+		if (Fsin > 152000)
+			*pre_proc = 2;
+		else
+			*pre_proc = 1;
+	} else if (Fsin < 76000)
+		*pre_proc = 0;
+	else if (Fsin > 152000)
+		*pre_proc = 2;
+	else
+		*pre_proc = 1;
+
+	if (det_out_op2_cond)
+		*post_proc = 2;
+	else if (det_out_op0_cond)
+		*post_proc = 0;
+	else
+		*post_proc = 1;
+
+	/* unsupported options */
+	if (*pre_proc == 4 || *pre_proc == 5)
+		return -EINVAL;
+
+	return 0;
+}
+
 /**
  * Request ASRC pair
  *
@@ -239,8 +278,10 @@ static int fsl_asrc_config_pair(struct fsl_asrc_pair *pair)
 	u32 inrate, outrate, indiv, outdiv;
 	u32 clk_index[2], div[2];
 	int in, out, channels;
+	int pre_proc, post_proc;
 	struct clk *clk;
 	bool ideal;
+	int ret;
 
 	if (!config) {
 		pair_err("invalid pair config\n");
@@ -289,6 +330,12 @@ static int fsl_asrc_config_pair(struct fsl_asrc_pair *pair)
 		return -EINVAL;
 	}
 
+	ret = fsl_asrc_sel_proc(inrate, outrate, &pre_proc, &post_proc);
+	if (ret) {
+		pair_err("No supported pre-processing options\n");
+		return ret;
+	}
+
 	/* Validate input and output clock sources */
 	clk_index[IN] = clk_map[IN][config->inclk];
 	clk_index[OUT] = clk_map[OUT][config->outclk];
@@ -380,8 +427,8 @@ static int fsl_asrc_config_pair(struct fsl_asrc_pair *pair)
 	/* Apply configurations for pre- and post-processing */
 	regmap_update_bits(asrc_priv->regmap, REG_ASRCFG,
 			   ASRCFG_PREMODi_MASK(index) |	ASRCFG_POSTMODi_MASK(index),
-			   ASRCFG_PREMOD(index, process_option[in][out][0]) |
-			   ASRCFG_POSTMOD(index, process_option[in][out][1]));
+			   ASRCFG_PREMOD(index, pre_proc) |
+			   ASRCFG_POSTMOD(index, post_proc));
 
 	return fsl_asrc_set_ideal_ratio(pair, inrate, outrate);
 }
-- 
1.9.1

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