From e2681a1bf5ae053426a6c5c1daaed17b2f95efe6 Mon Sep 17 00:00:00 2001 From: Nicolin Chen Date: Thu, 27 Mar 2014 19:06:59 +0800 Subject: [PATCH] ASoC: fsl_sai: Add isr to deal with error flag It's quite cricial to clear error flags because SAI might hang if getting FIFO underrun during playback (I haven't confirmed the same issue on Rx overflow though). So this patch enables those irq and adds isr() to clear the flags so as to keep playback entirely safe. Signed-off-by: Nicolin Chen Signed-off-by: Mark Brown --- sound/soc/fsl/fsl_sai.c | 85 +++++++++++++++++++++++++++++++++++++++-- sound/soc/fsl/fsl_sai.h | 15 ++++++++ 2 files changed, 97 insertions(+), 3 deletions(-) diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c index c4a423111673..0bc98bb21810 100644 --- a/sound/soc/fsl/fsl_sai.c +++ b/sound/soc/fsl/fsl_sai.c @@ -23,6 +23,71 @@ #include "fsl_sai.h" +#define FSL_SAI_FLAGS (FSL_SAI_CSR_SEIE |\ + FSL_SAI_CSR_FEIE) + +static irqreturn_t fsl_sai_isr(int irq, void *devid) +{ + struct fsl_sai *sai = (struct fsl_sai *)devid; + struct device *dev = &sai->pdev->dev; + u32 xcsr, mask; + + /* Only handle those what we enabled */ + mask = (FSL_SAI_FLAGS >> FSL_SAI_CSR_xIE_SHIFT) << FSL_SAI_CSR_xF_SHIFT; + + /* Tx IRQ */ + regmap_read(sai->regmap, FSL_SAI_TCSR, &xcsr); + xcsr &= mask; + + if (xcsr & FSL_SAI_CSR_WSF) + dev_dbg(dev, "isr: Start of Tx word detected\n"); + + if (xcsr & FSL_SAI_CSR_SEF) + dev_warn(dev, "isr: Tx Frame sync error detected\n"); + + if (xcsr & FSL_SAI_CSR_FEF) { + dev_warn(dev, "isr: Transmit underrun detected\n"); + /* FIFO reset for safety */ + xcsr |= FSL_SAI_CSR_FR; + } + + if (xcsr & FSL_SAI_CSR_FWF) + dev_dbg(dev, "isr: Enabled transmit FIFO is empty\n"); + + if (xcsr & FSL_SAI_CSR_FRF) + dev_dbg(dev, "isr: Transmit FIFO watermark has been reached\n"); + + regmap_update_bits(sai->regmap, FSL_SAI_TCSR, + FSL_SAI_CSR_xF_W_MASK | FSL_SAI_CSR_FR, xcsr); + + /* Rx IRQ */ + regmap_read(sai->regmap, FSL_SAI_RCSR, &xcsr); + xcsr &= mask; + + if (xcsr & FSL_SAI_CSR_WSF) + dev_dbg(dev, "isr: Start of Rx word detected\n"); + + if (xcsr & FSL_SAI_CSR_SEF) + dev_warn(dev, "isr: Rx Frame sync error detected\n"); + + if (xcsr & FSL_SAI_CSR_FEF) { + dev_warn(dev, "isr: Receive overflow detected\n"); + /* FIFO reset for safety */ + xcsr |= FSL_SAI_CSR_FR; + } + + if (xcsr & FSL_SAI_CSR_FWF) + dev_dbg(dev, "isr: Enabled receive FIFO is full\n"); + + if (xcsr & FSL_SAI_CSR_FRF) + dev_dbg(dev, "isr: Receive FIFO watermark has been reached\n"); + + regmap_update_bits(sai->regmap, FSL_SAI_RCSR, + FSL_SAI_CSR_xF_W_MASK | FSL_SAI_CSR_FR, xcsr); + + return IRQ_HANDLED; +} + static int fsl_sai_set_dai_sysclk_tr(struct snd_soc_dai *cpu_dai, int clk_id, unsigned int freq, int fsl_dir) { @@ -373,8 +438,8 @@ static int fsl_sai_dai_probe(struct snd_soc_dai *cpu_dai) { struct fsl_sai *sai = dev_get_drvdata(cpu_dai->dev); - regmap_update_bits(sai->regmap, FSL_SAI_TCSR, 0xffffffff, 0x0); - regmap_update_bits(sai->regmap, FSL_SAI_RCSR, 0xffffffff, 0x0); + regmap_update_bits(sai->regmap, FSL_SAI_TCSR, 0xffffffff, FSL_SAI_FLAGS); + regmap_update_bits(sai->regmap, FSL_SAI_RCSR, 0xffffffff, FSL_SAI_FLAGS); regmap_update_bits(sai->regmap, FSL_SAI_TCR1, FSL_SAI_CR1_RFW_MASK, FSL_SAI_MAXBURST_TX * 2); regmap_update_bits(sai->regmap, FSL_SAI_RCR1, FSL_SAI_CR1_RFW_MASK, @@ -490,12 +555,14 @@ static int fsl_sai_probe(struct platform_device *pdev) struct fsl_sai *sai; struct resource *res; void __iomem *base; - int ret; + int irq, ret; sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL); if (!sai) return -ENOMEM; + sai->pdev = pdev; + sai->big_endian_regs = of_property_read_bool(np, "big-endian-regs"); if (sai->big_endian_regs) fsl_sai_regmap_config.val_format_endian = REGMAP_ENDIAN_BIG; @@ -514,6 +581,18 @@ static int fsl_sai_probe(struct platform_device *pdev) return PTR_ERR(sai->regmap); } + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(&pdev->dev, "no irq for node %s\n", np->full_name); + return irq; + } + + ret = devm_request_irq(&pdev->dev, irq, fsl_sai_isr, 0, np->name, sai); + if (ret) { + dev_err(&pdev->dev, "failed to claim irq %u\n", irq); + return ret; + } + sai->dma_params_rx.addr = res->start + FSL_SAI_RDR; sai->dma_params_tx.addr = res->start + FSL_SAI_TDR; sai->dma_params_rx.maxburst = FSL_SAI_MAXBURST_RX; diff --git a/sound/soc/fsl/fsl_sai.h b/sound/soc/fsl/fsl_sai.h index e432260be598..a264185c7138 100644 --- a/sound/soc/fsl/fsl_sai.h +++ b/sound/soc/fsl/fsl_sai.h @@ -37,7 +37,21 @@ /* SAI Transmit/Recieve Control Register */ #define FSL_SAI_CSR_TERE BIT(31) +#define FSL_SAI_CSR_FR BIT(25) +#define FSL_SAI_CSR_xF_SHIFT 16 +#define FSL_SAI_CSR_xF_W_SHIFT 18 +#define FSL_SAI_CSR_xF_MASK (0x1f << FSL_SAI_CSR_xF_SHIFT) +#define FSL_SAI_CSR_xF_W_MASK (0x7 << FSL_SAI_CSR_xF_W_SHIFT) +#define FSL_SAI_CSR_WSF BIT(20) +#define FSL_SAI_CSR_SEF BIT(19) +#define FSL_SAI_CSR_FEF BIT(18) #define FSL_SAI_CSR_FWF BIT(17) +#define FSL_SAI_CSR_FRF BIT(16) +#define FSL_SAI_CSR_xIE_SHIFT 8 +#define FSL_SAI_CSR_WSIE BIT(12) +#define FSL_SAI_CSR_SEIE BIT(11) +#define FSL_SAI_CSR_FEIE BIT(10) +#define FSL_SAI_CSR_FWIE BIT(9) #define FSL_SAI_CSR_FRIE BIT(8) #define FSL_SAI_CSR_FRDE BIT(0) @@ -99,6 +113,7 @@ #define FSL_SAI_MAXBURST_RX 6 struct fsl_sai { + struct platform_device *pdev; struct regmap *regmap; bool big_endian_regs;