linux-kernel - [PATCH 19/31] ASoC: sh: rz-ssi: Issue software reset in hw

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Message-Id: <20241106081826.1211088-20-claudiu.beznea.uj@bp.renesas.com>
Date: Wed,  6 Nov 2024 10:18:14 +0200
From: Claudiu <claudiu.beznea@...on.dev>
To: geert+renesas@...der.be,
	mturquette@...libre.com,
	sboyd@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	biju.das.jz@...renesas.com,
	prabhakar.mahadev-lad.rj@...renesas.com,
	lgirdwood@...il.com,
	broonie@...nel.org,
	magnus.damm@...il.com,
	linus.walleij@...aro.org,
	support.opensource@...semi.com,
	perex@...ex.cz,
	tiwai@...e.com,
	p.zabel@...gutronix.de,
	Adam.Thomson.Opensource@...semi.com
Cc: linux-renesas-soc@...r.kernel.org,
	linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-sound@...r.kernel.org,
	linux-gpio@...r.kernel.org,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: [PATCH 19/31] ASoC: sh: rz-ssi: Issue software reset in hw_params API

From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

The code initially issued software reset on SNDRV_PCM_TRIGGER_START
action only before starting the first stream. This can be easily moved to
hw_params() as the action is similar to setting the clocks. Moreover,
according to the hardware manual (Table 35.7 Bits Initialized by Software
Reset of the SSIFCR.SSIRST Bit) the software reset action acts also on the
clock dividers bits. Due to this issue the software reset in hw_params()
before configuring the clock dividers. This also simplifies the code in
trigger API.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
---
 sound/soc/renesas/rz-ssi.c | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/sound/soc/renesas/rz-ssi.c b/sound/soc/renesas/rz-ssi.c
index 16bca493a254..f767a667c2bf 100644
--- a/sound/soc/renesas/rz-ssi.c
+++ b/sound/soc/renesas/rz-ssi.c
@@ -388,6 +388,15 @@ static int rz_ssi_start(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm)
 	return 0;
 }
 
+static int rz_ssi_swreset(struct rz_ssi_priv *ssi)
+{
+	u32 tmp;
+
+	rz_ssi_reg_mask_setl(ssi, SSIFCR, SSIFCR_SSIRST, SSIFCR_SSIRST);
+	rz_ssi_reg_mask_setl(ssi, SSIFCR, SSIFCR_SSIRST, 0);
+	return readl_poll_timeout_atomic(ssi->base + SSIFCR, tmp, !(tmp & SSIFCR_SSIRST), 1, 5);
+}
+
 static int rz_ssi_stop(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm)
 {
 	strm->running = 0;
@@ -782,14 +791,6 @@ static int rz_ssi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
-		/* Soft Reset */
-		if (!rz_ssi_is_stream_running(&ssi->playback) &&
-		    !rz_ssi_is_stream_running(&ssi->capture)) {
-			rz_ssi_reg_mask_setl(ssi, SSIFCR, 0, SSIFCR_SSIRST);
-			rz_ssi_reg_mask_setl(ssi, SSIFCR, SSIFCR_SSIRST, 0);
-			udelay(5);
-		}
-
 		rz_ssi_stream_init(strm, substream);
 
 		if (ssi->dma_rt) {
@@ -914,6 +915,7 @@ static int rz_ssi_dai_hw_params(struct snd_pcm_substream *substream,
 					SNDRV_PCM_HW_PARAM_SAMPLE_BITS)->min;
 	unsigned int channels = params_channels(params);
 	unsigned int rate = params_rate(params);
+	int ret;
 
 	if (sample_bits != 16) {
 		dev_err(ssi->dev, "Unsupported sample width: %d\n",
@@ -940,6 +942,10 @@ static int rz_ssi_dai_hw_params(struct snd_pcm_substream *substream,
 	rz_ssi_cache_hw_params(ssi, rate, channels, strm->sample_width,
 			       sample_bits);
 
+	ret = rz_ssi_swreset(ssi);
+	if (ret)
+		return ret;
+
 	return rz_ssi_clk_setup(ssi, rate, channels);
 }
 
-- 
2.39.2