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[v5,03/20] ASoC: sun4i-i2s: Change get_sr() and get_wss() to be more explicit

Message ID 20200927192912.46323-4-peron.clem@gmail.com (mailing list archive)
State Superseded
Headers show
Series Add Allwinner H3/H5/H6/A64 HDMI audio | expand

Commit Message

Clément Péron Sept. 27, 2020, 7:28 p.m. UTC
We are actually using a complex formula to just return a bunch of
simple values. Also this formula is wrong for sun4i when calling
get_wss() the function return 4 instead of 3.

Replace this with a simpler switch case.

Also drop the i2s params which is unused and return a simple int as
returning an error code could be out of range for an s8 and there is
no optim to return a s8 here.

Signed-off-by: Clément Péron <peron.clem@gmail.com>
---
 sound/soc/sunxi/sun4i-i2s.c | 69 +++++++++++++++++++++++--------------
 1 file changed, 44 insertions(+), 25 deletions(-)

Comments

Chen-Yu Tsai Sept. 28, 2020, 4:37 a.m. UTC | #1
On Mon, Sep 28, 2020 at 3:29 AM Clément Péron <peron.clem@gmail.com> wrote:
>
> We are actually using a complex formula to just return a bunch of
> simple values. Also this formula is wrong for sun4i when calling
> get_wss() the function return 4 instead of 3.
>
> Replace this with a simpler switch case.
>
> Also drop the i2s params which is unused and return a simple int as
> returning an error code could be out of range for an s8 and there is
> no optim to return a s8 here.
>
> Signed-off-by: Clément Péron <peron.clem@gmail.com>

Fixes: 619c15f7fac9 ("ASoC: sun4i-i2s: Change SR and WSS computation")

Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Chen-Yu Tsai Sept. 28, 2020, 5:02 a.m. UTC | #2
On Mon, Sep 28, 2020 at 12:37 PM Chen-Yu Tsai <wens@csie.org> wrote:
>
> On Mon, Sep 28, 2020 at 3:29 AM Clément Péron <peron.clem@gmail.com> wrote:
> >
> > We are actually using a complex formula to just return a bunch of
> > simple values. Also this formula is wrong for sun4i when calling

BTW, it is entirely possible that the compiler optimizes your switch-case
back into the original complex formula you replaced. :)

> > get_wss() the function return 4 instead of 3.
> >
> > Replace this with a simpler switch case.
> >
> > Also drop the i2s params which is unused and return a simple int as
> > returning an error code could be out of range for an s8 and there is
> > no optim to return a s8 here.
> >
> > Signed-off-by: Clément Péron <peron.clem@gmail.com>
>
> Fixes: 619c15f7fac9 ("ASoC: sun4i-i2s: Change SR and WSS computation")
>
> Reviewed-by: Chen-Yu Tsai <wens@csie.org>
diff mbox series

Patch

diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
index 0633b9fba3d7..11bbcbe24d6b 100644
--- a/sound/soc/sunxi/sun4i-i2s.c
+++ b/sound/soc/sunxi/sun4i-i2s.c
@@ -175,8 +175,8 @@  struct sun4i_i2s_quirks {
 	unsigned int			num_mclk_dividers;
 
 	unsigned long (*get_bclk_parent_rate)(const struct sun4i_i2s *);
-	s8	(*get_sr)(const struct sun4i_i2s *, int);
-	s8	(*get_wss)(const struct sun4i_i2s *, int);
+	int	(*get_sr)(unsigned int width);
+	int	(*get_wss)(unsigned int width);
 	int	(*set_chan_cfg)(const struct sun4i_i2s *i2s,
 				unsigned int channels,	unsigned int slots,
 				unsigned int slot_width);
@@ -381,37 +381,56 @@  static int sun4i_i2s_set_clk_rate(struct snd_soc_dai *dai,
 	return 0;
 }
 
-static s8 sun4i_i2s_get_sr(const struct sun4i_i2s *i2s, int width)
+static int sun4i_i2s_get_sr(unsigned int width)
 {
-	if (width < 16 || width > 24)
-		return -EINVAL;
-
-	if (width % 4)
-		return -EINVAL;
+	switch (width) {
+	case 16:
+		return 0x0;
+	case 20:
+		return 0x1;
+	case 24:
+		return 0x2;
+	}
 
-	return (width - 16) / 4;
+	return -EINVAL;
 }
 
-static s8 sun4i_i2s_get_wss(const struct sun4i_i2s *i2s, int width)
+static int sun4i_i2s_get_wss(unsigned int width)
 {
-	if (width < 16 || width > 32)
-		return -EINVAL;
-
-	if (width % 4)
-		return -EINVAL;
+	switch (width) {
+	case 16:
+		return 0x0;
+	case 20:
+		return 0x1;
+	case 24:
+		return 0x2;
+	case 32:
+		return 0x3;
+	}
 
-	return (width - 16) / 4;
+	return -EINVAL;
 }
 
-static s8 sun8i_i2s_get_sr_wss(const struct sun4i_i2s *i2s, int width)
+static int sun8i_i2s_get_sr_wss(unsigned int width)
 {
-	if (width % 4)
-		return -EINVAL;
-
-	if (width < 8 || width > 32)
-		return -EINVAL;
+	switch (width) {
+	case 8:
+		return 0x1;
+	case 12:
+		return 0x2;
+	case 16:
+		return 0x3;
+	case 20:
+		return 0x4;
+	case 24:
+		return 0x5;
+	case 28:
+		return 0x6;
+	case 32:
+		return 0x7;
+	}
 
-	return (width - 8) / 4 + 1;
+	return -EINVAL;
 }
 
 static int sun4i_i2s_set_chan_cfg(const struct sun4i_i2s *i2s,
@@ -572,11 +591,11 @@  static int sun4i_i2s_hw_params(struct snd_pcm_substream *substream,
 	}
 	i2s->playback_dma_data.addr_width = width;
 
-	sr = i2s->variant->get_sr(i2s, word_size);
+	sr = i2s->variant->get_sr(word_size);
 	if (sr < 0)
 		return -EINVAL;
 
-	wss = i2s->variant->get_wss(i2s, slot_width);
+	wss = i2s->variant->get_wss(slot_width);
 	if (wss < 0)
 		return -EINVAL;