Interrupt statistics of fsl_ssi are mainly for debugging purpose. Most of those interrupts show error states, e.g. under/overflow. The stats should be exposed via debugfs instead of sysfs.
This patch moves the statistics file to debugfs.
Signed-off-by: Markus Pargmann mpa@pengutronix.de --- sound/soc/fsl/fsl_ssi.c | 190 ++++++++++++++++++++++++++++++------------------ 1 file changed, 121 insertions(+), 69 deletions(-)
diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c index fb8f52a..66ffc58 100644 --- a/sound/soc/fsl/fsl_ssi.c +++ b/sound/soc/fsl/fsl_ssi.c @@ -35,6 +35,7 @@ #include <linux/module.h> #include <linux/interrupt.h> #include <linux/clk.h> +#include <linux/debugfs.h> #include <linux/device.h> #include <linux/delay.h> #include <linux/slab.h> @@ -113,6 +114,14 @@ static inline void write_ssi_mask(u32 __iomem *addr, u32 clear, u32 set) CCSR_SSI_SIER_RDMAE | CCSR_SSI_SIER_RIE | \ CCSR_SSI_SIER_ROE0_EN | CCSR_SSI_SIER_ROE1_EN)
+#define FSLSSI_SIER_DBG_RX_FLAGS (CCSR_SSI_SIER_RFF0_EN | \ + CCSR_SSI_SIER_RLS_EN | CCSR_SSI_SIER_RFS_EN | \ + CCSR_SSI_SIER_ROE0_EN | CCSR_SSI_SIER_RFRC_EN) +#define FSLSSI_SIER_DBG_TX_FLAGS (CCSR_SSI_SIER_TFE0_EN | \ + CCSR_SSI_SIER_TLS_EN | CCSR_SSI_SIER_TFS_EN | \ + CCSR_SSI_SIER_TUE0_EN | CCSR_SSI_SIER_TFRC_EN) +#define FSLSSI_SISR_MASK (FSLSSI_SIER_DBG_RX_FLAGS | FSLSSI_SIER_DBG_TX_FLAGS) + /** * fsl_ssi_private: per-SSI private data * @@ -136,7 +145,6 @@ struct fsl_ssi_private { struct snd_pcm_substream *second_stream; unsigned int fifo_depth; struct snd_soc_dai_driver cpu_dai_drv; - struct device_attribute dev_attr; struct platform_device *pdev;
bool new_binding; @@ -173,6 +181,8 @@ struct fsl_ssi_private { unsigned int tfe1; unsigned int tfe0; } stats; + struct dentry *dbg_dir; + struct dentry *dbg_stats;
char name[1]; }; @@ -201,7 +211,7 @@ static irqreturn_t fsl_ssi_isr(int irq, void *dev_id) were interrupted for. We mask it with the Interrupt Enable register so that we only check for events that we're interested in. */ - sisr = read_ssi(&ssi->sisr) & SIER_FLAGS; + sisr = read_ssi(&ssi->sisr) & FSLSSI_SISR_MASK;
if (sisr & CCSR_SSI_SISR_RFRC) { ssi_private->stats.rfrc++; @@ -321,6 +331,102 @@ static irqreturn_t fsl_ssi_isr(int irq, void *dev_id) return ret; }
+#if IS_ENABLED(CONFIG_DEBUG_FS) +/* Show the statistics of a flag only if its interrupt is enabled. The + * compiler will optimze this code to a no-op if the interrupt is not + * enabled. + */ +#define SIER_SHOW(flag, name) \ + do { \ + if (FSLSSI_SISR_MASK & CCSR_SSI_SIER_##flag) \ + seq_printf(s, #name "=%u\n", ssi_private->stats.name); \ + } while (0) + + +/** + * fsl_sysfs_ssi_show: display SSI statistics + * + * Display the statistics for the current SSI device. To avoid confusion, + * we only show those counts that are enabled. + */ +static ssize_t fsl_ssi_stats_show(struct seq_file *s, void *unused) +{ + struct fsl_ssi_private *ssi_private = s->private; + + SIER_SHOW(RFRC_EN, rfrc); + SIER_SHOW(TFRC_EN, tfrc); + SIER_SHOW(CMDAU_EN, cmdau); + SIER_SHOW(CMDDU_EN, cmddu); + SIER_SHOW(RXT_EN, rxt); + SIER_SHOW(RDR1_EN, rdr1); + SIER_SHOW(RDR0_EN, rdr0); + SIER_SHOW(TDE1_EN, tde1); + SIER_SHOW(TDE0_EN, tde0); + SIER_SHOW(ROE1_EN, roe1); + SIER_SHOW(ROE0_EN, roe0); + SIER_SHOW(TUE1_EN, tue1); + SIER_SHOW(TUE0_EN, tue0); + SIER_SHOW(TFS_EN, tfs); + SIER_SHOW(RFS_EN, rfs); + SIER_SHOW(TLS_EN, tls); + SIER_SHOW(RLS_EN, rls); + SIER_SHOW(RFF1_EN, rff1); + SIER_SHOW(RFF0_EN, rff0); + SIER_SHOW(TFE1_EN, tfe1); + SIER_SHOW(TFE0_EN, tfe0); + + return 0; +} + +static int fsl_ssi_stats_open(struct inode *inode, struct file *file) +{ + return single_open(file, fsl_ssi_stats_show, inode->i_private); +} + +static const struct file_operations fsl_ssi_stats_ops = { + .open = fsl_ssi_stats_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int fsl_ssi_debugfs_create(struct fsl_ssi_private *ssi_private, + struct device *dev) +{ + ssi_private->dbg_dir = debugfs_create_dir(dev_name(dev), NULL); + if (!ssi_private->dbg_dir) + return -ENOMEM; + + ssi_private->dbg_stats = debugfs_create_file("stats", S_IRUGO, + ssi_private->dbg_dir, ssi_private, &fsl_ssi_stats_ops); + if (!ssi_private->dbg_stats) { + debugfs_remove(ssi_private->dbg_dir); + return -ENOMEM; + } + + return 0; +} + +static void fsl_ssi_debugfs_remove(struct fsl_ssi_private *ssi_private) +{ + debugfs_remove(ssi_private->dbg_stats); + debugfs_remove(ssi_private->dbg_dir); +} + +#else + +static int fsl_ssi_debugfs_create(struct fsl_ssi_private *ssi_private, + struct device *dev) +{ + return 0; +} + +static void fsl_ssi_debugfs_remove(struct fsl_ssi_private *ssi_private) +{ +} + +#endif /* IS_ENABLED(CONFIG_DEBUG_FS) */ + static void fsl_ssi_setup_ac97(struct fsl_ssi_private *ssi_private) { struct ccsr_ssi __iomem *ssi = ssi_private->ssi; @@ -795,56 +901,6 @@ static struct snd_ac97_bus_ops fsl_ssi_ac97_ops = { .write = fsl_ssi_ac97_write, };
-/* Show the statistics of a flag only if its interrupt is enabled. The - * compiler will optimze this code to a no-op if the interrupt is not - * enabled. - */ -#define SIER_SHOW(flag, name) \ - do { \ - if (SIER_FLAGS & CCSR_SSI_SIER_##flag) \ - length += sprintf(buf + length, #name "=%u\n", \ - ssi_private->stats.name); \ - } while (0) - - -/** - * fsl_sysfs_ssi_show: display SSI statistics - * - * Display the statistics for the current SSI device. To avoid confusion, - * we only show those counts that are enabled. - */ -static ssize_t fsl_sysfs_ssi_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct fsl_ssi_private *ssi_private = - container_of(attr, struct fsl_ssi_private, dev_attr); - ssize_t length = 0; - - SIER_SHOW(RFRC_EN, rfrc); - SIER_SHOW(TFRC_EN, tfrc); - SIER_SHOW(CMDAU_EN, cmdau); - SIER_SHOW(CMDDU_EN, cmddu); - SIER_SHOW(RXT_EN, rxt); - SIER_SHOW(RDR1_EN, rdr1); - SIER_SHOW(RDR0_EN, rdr0); - SIER_SHOW(TDE1_EN, tde1); - SIER_SHOW(TDE0_EN, tde0); - SIER_SHOW(ROE1_EN, roe1); - SIER_SHOW(ROE0_EN, roe0); - SIER_SHOW(TUE1_EN, tue1); - SIER_SHOW(TUE0_EN, tue0); - SIER_SHOW(TFS_EN, tfs); - SIER_SHOW(RFS_EN, rfs); - SIER_SHOW(TLS_EN, tls); - SIER_SHOW(RLS_EN, rls); - SIER_SHOW(RFF1_EN, rff1); - SIER_SHOW(RFF0_EN, rff0); - SIER_SHOW(TFE1_EN, tfe1); - SIER_SHOW(TFE0_EN, tfe0); - - return length; -} - /** * Make every character in a string lower-case */ @@ -1020,20 +1076,6 @@ static int fsl_ssi_probe(struct platform_device *pdev) } }
- /* Initialize the the device_attribute structure */ - dev_attr = &ssi_private->dev_attr; - sysfs_attr_init(&dev_attr->attr); - dev_attr->attr.name = "statistics"; - dev_attr->attr.mode = S_IRUGO; - dev_attr->show = fsl_sysfs_ssi_show; - - ret = device_create_file(&pdev->dev, dev_attr); - if (ret) { - dev_err(&pdev->dev, "could not create sysfs %s file\n", - ssi_private->dev_attr.attr.name); - goto error_clk; - } - /* Register with ASoC */ dev_set_drvdata(&pdev->dev, ssi_private);
@@ -1044,6 +1086,10 @@ static int fsl_ssi_probe(struct platform_device *pdev) goto error_dev; }
+ ret = fsl_ssi_debugfs_create(ssi_private, &pdev->dev); + if (ret) + goto error_dbgfs; + if (ssi_private->ssi_on_imx) { if (!ssi_private->use_dma) {
@@ -1063,11 +1109,11 @@ static int fsl_ssi_probe(struct platform_device *pdev)
ret = imx_pcm_fiq_init(pdev, &ssi_private->fiq_params); if (ret) - goto error_dev; + goto error_pcm; } else { ret = imx_pcm_dma_init(pdev); if (ret) - goto error_dev; + goto error_pcm; } }
@@ -1111,6 +1157,11 @@ done: error_dai: if (ssi_private->ssi_on_imx) imx_pcm_dma_exit(pdev); + +error_pcm: + fsl_ssi_debugfs_remove(ssi_private); + +error_dbgfs: snd_soc_unregister_component(&pdev->dev);
error_dev: @@ -1130,12 +1181,13 @@ static int fsl_ssi_remove(struct platform_device *pdev) { struct fsl_ssi_private *ssi_private = dev_get_drvdata(&pdev->dev);
+ fsl_ssi_debugfs_remove(ssi_private); + if (!ssi_private->new_binding) platform_device_unregister(ssi_private->pdev); if (ssi_private->ssi_on_imx) imx_pcm_dma_exit(pdev); snd_soc_unregister_component(&pdev->dev); - device_remove_file(&pdev->dev, &ssi_private->dev_attr); if (ssi_private->ssi_on_imx) clk_disable_unprepare(ssi_private->clk); irq_dispose_mapping(ssi_private->irq);