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ASoC: rsnd: enable clk_i approximate rate usage

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Basically Renesas sound ADG is assuming that it has accurately
divisible input clock. But sometimes / some board might not have it.
The clk_i from CPG is used for such case. It can't calculate accurate
division, but can be used as approximate rate.
This patch enable clk_i for such case.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Adnan Ali <adnan.ali@bp.renesas.com>
Tested-by: Vincenzo De Michele <vincenzo.michele@davinci.de>
Tested-by: Patrick Keil <patrick.keil@conti-engineering.com>
Link: https://lore.kernel.org/r/87msyizlfd.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Kuninori Morimoto 2023-08-22 23:50:31 +00:00 committed by Mark Brown
parent 220adc0fda
commit bd4cee2fdf
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GPG key ID: 24D68B725D5487D0
1 changed files with 36 additions and 0 deletions
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36
sound/soc/sh/rcar/adg.c
View file

@ -491,6 +491,7 @@ static int rsnd_adg_get_clkout(struct rsnd_priv *priv)
unsigned long req_Hz[ADG_HZ_SIZE];
int clkout_size;
int i, req_size;
int approximate = 0;
const char *parent_clk_name = NULL;
const char * const *clkout_name;
int brg_table[] = {
@ -537,6 +538,26 @@ static int rsnd_adg_get_clkout(struct rsnd_priv *priv)
* rsnd_adg_ssi_clk_try_start()
* rsnd_ssi_master_clk_start()
*/
/*
* [APPROXIMATE]
*
* clk_i (internal clock) can't create accurate rate, it will be approximate rate.
*
* <Note>
*
* clk_i needs x2 of required maximum rate.
* see
* - Minimum division of BRRA/BRRB
* - rsnd_ssi_clk_query()
*
* Sample Settings for TDM 8ch, 32bit width
*
* 8(ch) x 32(bit) x 44100(Hz) x 2<Note> = 22579200
* 8(ch) x 32(bit) x 48000(Hz) x 2<Note> = 24576000
*
* clock-frequency = <22579200 24576000>;
*/
for_each_rsnd_clkin(clk, adg, i) {
rate = clk_get_rate(clk);
@ -544,6 +565,10 @@ static int rsnd_adg_get_clkout(struct rsnd_priv *priv)
continue;
/* BRGA */
if (i == CLKI)
/* see [APPROXIMATE] */
rate = (clk_get_rate(clk) / req_Hz[ADG_HZ_441]) * req_Hz[ADG_HZ_441];
if (!adg->brg_rate[ADG_HZ_441] && (0 == rate % 44100)) {
div = 6;
if (req_Hz[ADG_HZ_441])
@ -555,10 +580,16 @@ static int rsnd_adg_get_clkout(struct rsnd_priv *priv)
ckr |= brg_table[i] << 20;
if (req_Hz[ADG_HZ_441])
parent_clk_name = __clk_get_name(clk);
if (i == CLKI)
approximate = 1;
}
}
/* BRGB */
if (i == CLKI)
/* see [APPROXIMATE] */
rate = (clk_get_rate(clk) / req_Hz[ADG_HZ_48]) * req_Hz[ADG_HZ_48];
if (!adg->brg_rate[ADG_HZ_48] && (0 == rate % 48000)) {
div = 6;
if (req_Hz[ADG_HZ_48])
@ -570,10 +601,15 @@ static int rsnd_adg_get_clkout(struct rsnd_priv *priv)
ckr |= brg_table[i] << 16;
if (req_Hz[ADG_HZ_48])
parent_clk_name = __clk_get_name(clk);
if (i == CLKI)
approximate = 1;
}
}
}
if (approximate)
dev_info(dev, "It uses CLK_I as approximate rate");
clkout_name = clkout_name_gen2;
clkout_size = ARRAY_SIZE(clkout_name_gen2);
if (rsnd_is_gen4(priv))