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([82.78.167.28]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a9eb16a2dbcsm241369766b.40.2024.11.06.00.19.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 06 Nov 2024 00:19:57 -0800 (PST) From: Claudiu X-Google-Original-From: Claudiu To: geert+renesas@glider.be, mturquette@baylibre.com, sboyd@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, biju.das.jz@bp.renesas.com, prabhakar.mahadev-lad.rj@bp.renesas.com, lgirdwood@gmail.com, broonie@kernel.org, magnus.damm@gmail.com, linus.walleij@linaro.org, support.opensource@diasemi.com, perex@perex.cz, tiwai@suse.com, p.zabel@pengutronix.de, Adam.Thomson.Opensource@diasemi.com Cc: linux-renesas-soc@vger.kernel.org, linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-sound@vger.kernel.org, linux-gpio@vger.kernel.org, Claudiu Beznea Subject: [PATCH 20/31] ASoC: sh: rz-ssi: Add suspend to RAM support Date: Wed, 6 Nov 2024 10:18:15 +0200 Message-Id: <20241106081826.1211088-21-claudiu.beznea.uj@bp.renesas.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20241106081826.1211088-1-claudiu.beznea.uj@bp.renesas.com> References: <20241106081826.1211088-1-claudiu.beznea.uj@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Claudiu Beznea The SSIF-2 IP is available on the Renesas RZ/G3S SoC. The Renesas RZ/G3S SoC supports a power-saving mode where power to most of the SoC components is turned off. Add suspend/resume support to the SSIF-2 driver to support this power-saving mode. On SNDRV_PCM_TRIGGER_SUSPEND trigger the SSI is stopped (the stream user pointer is left untouched to avoid breaking user space and the dma buffer pointer is set to zero), on SNDRV_PCM_TRIGGER_RESUME software reset is issued for the SSIF-2 IP and the clocks are re-configured. Signed-off-by: Claudiu Beznea --- sound/soc/renesas/rz-ssi.c | 46 ++++++++++++++++++++++++++++++++++++-- 1 file changed, 44 insertions(+), 2 deletions(-) diff --git a/sound/soc/renesas/rz-ssi.c b/sound/soc/renesas/rz-ssi.c index f767a667c2bf..4fbcc8f11d54 100644 --- a/sound/soc/renesas/rz-ssi.c +++ b/sound/soc/renesas/rz-ssi.c @@ -782,6 +782,32 @@ static int rz_ssi_dma_request(struct rz_ssi_priv *ssi,= struct device *dev) return -ENODEV; } =20 +static int rz_ssi_trigger_resume(struct rz_ssi_priv *ssi) +{ + int ret; + + if (rz_ssi_is_stream_running(&ssi->playback) || + rz_ssi_is_stream_running(&ssi->capture)) + return 0; + + ret =3D rz_ssi_swreset(ssi); + if (ret) + return ret; + + return rz_ssi_clk_setup(ssi, ssi->hw_params_cache.rate, + ssi->hw_params_cache.channels); +} + +static void rz_ssi_streams_suspend(struct rz_ssi_priv *ssi) +{ + if (rz_ssi_is_stream_running(&ssi->playback) || + rz_ssi_is_stream_running(&ssi->capture)) + return; + + ssi->playback.dma_buffer_pos =3D 0; + ssi->capture.dma_buffer_pos =3D 0; +} + static int rz_ssi_dai_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai) { @@ -790,8 +816,16 @@ static int rz_ssi_dai_trigger(struct snd_pcm_substream= *substream, int cmd, int ret =3D 0, i, num_transfer =3D 1; =20 switch (cmd) { + case SNDRV_PCM_TRIGGER_RESUME: + ret =3D rz_ssi_trigger_resume(ssi); + if (ret) + return ret; + + fallthrough; + case SNDRV_PCM_TRIGGER_START: - rz_ssi_stream_init(strm, substream); + if (cmd =3D=3D SNDRV_PCM_TRIGGER_START) + rz_ssi_stream_init(strm, substream); =20 if (ssi->dma_rt) { bool is_playback; @@ -819,6 +853,12 @@ static int rz_ssi_dai_trigger(struct snd_pcm_substream= *substream, int cmd, =20 ret =3D rz_ssi_start(ssi, strm); break; + + case SNDRV_PCM_TRIGGER_SUSPEND: + rz_ssi_stop(ssi, strm); + rz_ssi_streams_suspend(ssi); + break; + case SNDRV_PCM_TRIGGER_STOP: rz_ssi_stop(ssi, strm); rz_ssi_stream_quit(ssi, strm); @@ -958,7 +998,8 @@ static const struct snd_soc_dai_ops rz_ssi_dai_ops =3D { static const struct snd_pcm_hardware rz_ssi_pcm_hardware =3D { .info =3D SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP | - SNDRV_PCM_INFO_MMAP_VALID, + SNDRV_PCM_INFO_MMAP_VALID | + SNDRV_PCM_INFO_RESUME, .buffer_bytes_max =3D PREALLOC_BUFFER, .period_bytes_min =3D 32, .period_bytes_max =3D 8192, @@ -1201,6 +1242,7 @@ static int rz_ssi_runtime_resume(struct device *dev) =20 static const struct dev_pm_ops rz_ssi_pm_ops =3D { RUNTIME_PM_OPS(rz_ssi_runtime_suspend, rz_ssi_runtime_resume, NULL) + SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, pm_runtime_force_resume) }; =20 static struct platform_driver rz_ssi_driver =3D { --=20 2.39.2