6.17-stable review patch. If anyone has any objections, please let me know.
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From: Kuninori Morimoto kuninori.morimoto.gx@renesas.com
[ Upstream commit 25226abc1affd4bf4f6dd415d475b76e7a273fa8 ]
MSIOF has TXRST/RXRST to reset FIFO, but it shouldn't be used during SYNC signal was asserted, because it will be cause of HW issue.
When MSIOF is used as Sound driver, this driver is assuming it is used as clock consumer mode (= Codec is clock provider). This means, it can't control SYNC signal by itself.
We need to use SW reset (= reset_control_xxx()) instead of TXRST/RXRST.
Signed-off-by: Kuninori Morimoto kuninori.morimoto.gx@renesas.com Tested-by: Yusuke Goda yusuke.goda.sx@renesas.com Link: https://patch.msgid.link/87cy7fyuug.wl-kuninori.morimoto.gx@renesas.com Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- sound/soc/renesas/rcar/msiof.c | 39 +++++++++++++++++++++++++++++++++- 1 file changed, 38 insertions(+), 1 deletion(-)
diff --git a/sound/soc/renesas/rcar/msiof.c b/sound/soc/renesas/rcar/msiof.c index 7a9ecc73231a8..3a1a6496637dd 100644 --- a/sound/soc/renesas/rcar/msiof.c +++ b/sound/soc/renesas/rcar/msiof.c @@ -24,12 +24,25 @@ * Clock/Frame Consumer Mode. */
+/* + * [NOTE-RESET] + * + * MSIOF has TXRST/RXRST to reset FIFO, but it shouldn't be used during SYNC signal was asserted, + * because it will be cause of HW issue. + * + * When MSIOF is used as Sound driver, this driver is assuming it is used as clock consumer mode + * (= Codec is clock provider). This means, it can't control SYNC signal by itself. + * + * We need to use SW reset (= reset_control_xxx()) instead of TXRST/RXRST. + */ + #include <linux/module.h> #include <linux/of.h> #include <linux/of_dma.h> #include <linux/of_graph.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> +#include <linux/reset.h> #include <linux/spi/sh_msiof.h> #include <sound/dmaengine_pcm.h> #include <sound/soc.h> @@ -61,10 +74,13 @@ struct msiof_priv { struct device *dev; struct snd_pcm_substream *substream[SNDRV_PCM_STREAM_LAST + 1]; + struct reset_control *reset; spinlock_t lock; void __iomem *base; resource_size_t phy_addr;
+ int count; + /* for error */ int err_syc[SNDRV_PCM_STREAM_LAST + 1]; int err_ovf[SNDRV_PCM_STREAM_LAST + 1]; @@ -126,6 +142,16 @@ static int msiof_hw_start(struct snd_soc_component *component, * RX: Fig 109.15 */
+ /* + * Use reset_control_xx() instead of TXRST/RXRST. + * see + * [NOTE-RESET] + */ + if (!priv->count) + reset_control_deassert(priv->reset); + + priv->count++; + /* reset errors */ priv->err_syc[substream->stream] = priv->err_ovf[substream->stream] = @@ -144,7 +170,6 @@ static int msiof_hw_start(struct snd_soc_component *component, val = FIELD_PREP(SIMDR2_BITLEN1, width - 1); msiof_write(priv, SITMDR2, val | FIELD_PREP(SIMDR2_GRP, 1)); msiof_write(priv, SITMDR3, val); - } /* SIRMDRx */ else { @@ -217,6 +242,11 @@ static int msiof_hw_stop(struct snd_soc_component *component, priv->err_ovf[substream->stream], priv->err_udf[substream->stream]);
+ priv->count--; + + if (!priv->count) + reset_control_assert(priv->reset); + return 0; }
@@ -493,12 +523,19 @@ static int msiof_probe(struct platform_device *pdev) if (IS_ERR(priv->base)) return PTR_ERR(priv->base);
+ priv->reset = devm_reset_control_get_exclusive(dev, NULL); + if (IS_ERR(priv->reset)) + return PTR_ERR(priv->reset); + + reset_control_assert(priv->reset); + ret = devm_request_irq(dev, irq, msiof_interrupt, 0, dev_name(dev), priv); if (ret) return ret;
priv->dev = dev; priv->phy_addr = res->start; + priv->count = 0;
spin_lock_init(&priv->lock); platform_set_drvdata(pdev, priv);