OMAP: DSS2: Collect interrupt statistics

Collect interrupt statistics, printable via debugfs:

debugfs/omapdss/dispc_irq
debugfs/omapdss/dsi_irq

The counters are reset when printed.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>

5 files changed, 221 insertions, 0 deletions

diff --git a/drivers/video/omap2/dss/Kconfig b/drivers/video/omap2/dss/Kconfig
index 71d8dec30635..c63ce767b277 100644
--- a/drivers/video/omap2/dss/Kconfig
+++ b/drivers/video/omap2/dss/Kconfig
@@ -25,6 +25,13 @@ config OMAP2_DSS_DEBUG_SUPPORT
           This enables debug messages. You need to enable printing
           with 'debug' module parameter.
 
+config OMAP2_DSS_COLLECT_IRQ_STATS
+        bool "Collect DSS IRQ statistics"
+        depends on OMAP2_DSS_DEBUG_SUPPORT
+        default n
+        help
+          Collect DSS IRQ statistics, printable via debugfs
+
 config OMAP2_DSS_RFBI
         bool "RFBI support"
         default n
diff --git a/drivers/video/omap2/dss/core.c b/drivers/video/omap2/dss/core.c
index 29497a0c9a91..dbb0ce243f0c 100644
--- a/drivers/video/omap2/dss/core.c
+++ b/drivers/video/omap2/dss/core.c
@@ -395,6 +395,14 @@ static int dss_initialize_debugfs(void)
         debugfs_create_file("clk", S_IRUGO, dss_debugfs_dir,
                         &dss_debug_dump_clocks, &dss_debug_fops);
 
+        debugfs_create_file("dispc_irq", S_IRUGO, dss_debugfs_dir,
+                        &dispc_dump_irqs, &dss_debug_fops);
+
+#ifdef CONFIG_OMAP2_DSS_DSI
+        debugfs_create_file("dsi_irq", S_IRUGO, dss_debugfs_dir,
+                        &dsi_dump_irqs, &dss_debug_fops);
+#endif
+
         debugfs_create_file("dss", S_IRUGO, dss_debugfs_dir,
                         &dss_dump_regs, &dss_debug_fops);
         debugfs_create_file("dispc", S_IRUGO, dss_debugfs_dir,
diff --git a/drivers/video/omap2/dss/dispc.c b/drivers/video/omap2/dss/dispc.c
index 6dabf4b2f005..e2e0f9ae7353 100644
--- a/drivers/video/omap2/dss/dispc.c
+++ b/drivers/video/omap2/dss/dispc.c
@@ -148,6 +148,12 @@ static const struct dispc_reg dispc_reg_att[] = { DISPC_GFX_ATTRIBUTES,
         DISPC_VID_ATTRIBUTES(0),
         DISPC_VID_ATTRIBUTES(1) };
 
+struct dispc_irq_stats {
+        unsigned long last_reset;
+        unsigned irq_count;
+        unsigned irqs[32];
+};
+
 static struct {
         void __iomem    *base;
 
@@ -160,6 +166,11 @@ static struct {
         struct work_struct error_work;
 
         u32             ctx[DISPC_SZ_REGS / sizeof(u32)];
+
+#ifdef CONFIG_OMAP2_DSS_COLLECT_IRQ_STATS
+        spinlock_t irq_stats_lock;
+        struct dispc_irq_stats irq_stats;
+#endif
 } dispc;
 
 static void _omap_dispc_set_irqs(void);
@@ -2247,6 +2258,50 @@ void dispc_dump_clocks(struct seq_file *s)
         enable_clocks(0);
 }
 
+#ifdef CONFIG_OMAP2_DSS_COLLECT_IRQ_STATS
+void dispc_dump_irqs(struct seq_file *s)
+{
+        unsigned long flags;
+        struct dispc_irq_stats stats;
+
+        spin_lock_irqsave(&dispc.irq_stats_lock, flags);
+
+        stats = dispc.irq_stats;
+        memset(&dispc.irq_stats, 0, sizeof(dispc.irq_stats));
+        dispc.irq_stats.last_reset = jiffies;
+
+        spin_unlock_irqrestore(&dispc.irq_stats_lock, flags);
+
+        seq_printf(s, "period %u ms\n",
+                        jiffies_to_msecs(jiffies - stats.last_reset));
+
+        seq_printf(s, "irqs %d\n", stats.irq_count);
+#define PIS(x) \
+        seq_printf(s, "%-20s %10d\n", #x, stats.irqs[ffs(DISPC_IRQ_##x)-1]);
+
+        PIS(FRAMEDONE);
+        PIS(VSYNC);
+        PIS(EVSYNC_EVEN);
+        PIS(EVSYNC_ODD);
+        PIS(ACBIAS_COUNT_STAT);
+        PIS(PROG_LINE_NUM);
+        PIS(GFX_FIFO_UNDERFLOW);
+        PIS(GFX_END_WIN);
+        PIS(PAL_GAMMA_MASK);
+        PIS(OCP_ERR);
+        PIS(VID1_FIFO_UNDERFLOW);
+        PIS(VID1_END_WIN);
+        PIS(VID2_FIFO_UNDERFLOW);
+        PIS(VID2_END_WIN);
+        PIS(SYNC_LOST);
+        PIS(SYNC_LOST_DIGIT);
+        PIS(WAKEUP);
+#undef PIS
+}
+#else
+void dispc_dump_irqs(struct seq_file *s) { }
+#endif
+
 void dispc_dump_regs(struct seq_file *s)
 {
 #define DUMPREG(r) seq_printf(s, "%-35s %08x\n", #r, dispc_read_reg(r))
@@ -2665,6 +2720,13 @@ void dispc_irq_handler(void)
 
         irqstatus = dispc_read_reg(DISPC_IRQSTATUS);
 
+#ifdef CONFIG_OMAP2_DSS_COLLECT_IRQ_STATS
+        spin_lock(&dispc.irq_stats_lock);
+        dispc.irq_stats.irq_count++;
+        dss_collect_irq_stats(irqstatus, dispc.irq_stats.irqs);
+        spin_unlock(&dispc.irq_stats_lock);
+#endif
+
 #ifdef DEBUG
         if (dss_debug)
                 print_irq_status(irqstatus);
@@ -3012,6 +3074,11 @@ int dispc_init(void)
 
         spin_lock_init(&dispc.irq_lock);
 
+#ifdef CONFIG_OMAP2_DSS_COLLECT_IRQ_STATS
+        spin_lock_init(&dispc.irq_stats_lock);
+        dispc.irq_stats.last_reset = jiffies;
+#endif
+
         INIT_WORK(&dispc.error_work, dispc_error_worker);
 
         dispc.base = ioremap(DISPC_BASE, DISPC_SZ_REGS);
diff --git a/drivers/video/omap2/dss/dsi.c b/drivers/video/omap2/dss/dsi.c
index e65056317a28..03f85df70749 100644
--- a/drivers/video/omap2/dss/dsi.c
+++ b/drivers/video/omap2/dss/dsi.c
@@ -204,6 +204,14 @@ struct dsi_update_region {
         struct omap_dss_device *device;
 };
 
+struct dsi_irq_stats {
+        unsigned long last_reset;
+        unsigned irq_count;
+        unsigned dsi_irqs[32];
+        unsigned vc_irqs[4][32];
+        unsigned cio_irqs[32];
+};
+
 static struct
 {
         void __iomem    *base;
@@ -258,6 +266,11 @@ static struct
 #endif
         int debug_read;
         int debug_write;
+
+#ifdef CONFIG_OMAP2_DSS_COLLECT_IRQ_STATS
+        spinlock_t irq_stats_lock;
+        struct dsi_irq_stats irq_stats;
+#endif
 } dsi;
 
 #ifdef DEBUG
@@ -528,6 +541,12 @@ void dsi_irq_handler(void)
 
         irqstatus = dsi_read_reg(DSI_IRQSTATUS);
 
+#ifdef CONFIG_OMAP2_DSS_COLLECT_IRQ_STATS
+        spin_lock(&dsi.irq_stats_lock);
+        dsi.irq_stats.irq_count++;
+        dss_collect_irq_stats(irqstatus, dsi.irq_stats.dsi_irqs);
+#endif
+
         if (irqstatus & DSI_IRQ_ERROR_MASK) {
                 DSSERR("DSI error, irqstatus %x\n", irqstatus);
                 print_irq_status(irqstatus);
@@ -549,6 +568,10 @@ void dsi_irq_handler(void)
 
                 vcstatus = dsi_read_reg(DSI_VC_IRQSTATUS(i));
 
+#ifdef CONFIG_OMAP2_DSS_COLLECT_IRQ_STATS
+                dss_collect_irq_stats(vcstatus, dsi.irq_stats.vc_irqs[i]);
+#endif
+
                 if (vcstatus & DSI_VC_IRQ_BTA)
                         complete(&dsi.bta_completion);
 
@@ -568,6 +591,10 @@ void dsi_irq_handler(void)
         if (irqstatus & DSI_IRQ_COMPLEXIO_ERR) {
                 ciostatus = dsi_read_reg(DSI_COMPLEXIO_IRQ_STATUS);
 
+#ifdef CONFIG_OMAP2_DSS_COLLECT_IRQ_STATS
+                dss_collect_irq_stats(ciostatus, dsi.irq_stats.cio_irqs);
+#endif
+
                 dsi_write_reg(DSI_COMPLEXIO_IRQ_STATUS, ciostatus);
                 /* flush posted write */
                 dsi_read_reg(DSI_COMPLEXIO_IRQ_STATUS);
@@ -579,6 +606,10 @@ void dsi_irq_handler(void)
         dsi_write_reg(DSI_IRQSTATUS, irqstatus & ~DSI_IRQ_CHANNEL_MASK);
         /* flush posted write */
         dsi_read_reg(DSI_IRQSTATUS);
+
+#ifdef CONFIG_OMAP2_DSS_COLLECT_IRQ_STATS
+        spin_unlock(&dsi.irq_stats_lock);
+#endif
 }
 
 
@@ -1226,6 +1257,95 @@ void dsi_dump_clocks(struct seq_file *s)
         enable_clocks(0);
 }
 
+#ifdef CONFIG_OMAP2_DSS_COLLECT_IRQ_STATS
+void dsi_dump_irqs(struct seq_file *s)
+{
+        unsigned long flags;
+        struct dsi_irq_stats stats;
+
+        spin_lock_irqsave(&dsi.irq_stats_lock, flags);
+
+        stats = dsi.irq_stats;
+        memset(&dsi.irq_stats, 0, sizeof(dsi.irq_stats));
+        dsi.irq_stats.last_reset = jiffies;
+
+        spin_unlock_irqrestore(&dsi.irq_stats_lock, flags);
+
+        seq_printf(s, "period %u ms\n",
+                        jiffies_to_msecs(jiffies - stats.last_reset));
+
+        seq_printf(s, "irqs %d\n", stats.irq_count);
+#define PIS(x) \
+        seq_printf(s, "%-20s %10d\n", #x, stats.dsi_irqs[ffs(DSI_IRQ_##x)-1]);
+
+        seq_printf(s, "-- DSI interrupts --\n");
+        PIS(VC0);
+        PIS(VC1);
+        PIS(VC2);
+        PIS(VC3);
+        PIS(WAKEUP);
+        PIS(RESYNC);
+        PIS(PLL_LOCK);
+        PIS(PLL_UNLOCK);
+        PIS(PLL_RECALL);
+        PIS(COMPLEXIO_ERR);
+        PIS(HS_TX_TIMEOUT);
+        PIS(LP_RX_TIMEOUT);
+        PIS(TE_TRIGGER);
+        PIS(ACK_TRIGGER);
+        PIS(SYNC_LOST);
+        PIS(LDO_POWER_GOOD);
+        PIS(TA_TIMEOUT);
+#undef PIS
+
+#define PIS(x) \
+        seq_printf(s, "%-20s %10d %10d %10d %10d\n", #x, \
+                        stats.vc_irqs[0][ffs(DSI_VC_IRQ_##x)-1], \
+                        stats.vc_irqs[1][ffs(DSI_VC_IRQ_##x)-1], \
+                        stats.vc_irqs[2][ffs(DSI_VC_IRQ_##x)-1], \
+                        stats.vc_irqs[3][ffs(DSI_VC_IRQ_##x)-1]);
+
+        seq_printf(s, "-- VC interrupts --\n");
+        PIS(CS);
+        PIS(ECC_CORR);
+        PIS(PACKET_SENT);
+        PIS(FIFO_TX_OVF);
+        PIS(FIFO_RX_OVF);
+        PIS(BTA);
+        PIS(ECC_NO_CORR);
+        PIS(FIFO_TX_UDF);
+        PIS(PP_BUSY_CHANGE);
+#undef PIS
+
+#define PIS(x) \
+        seq_printf(s, "%-20s %10d\n", #x, \
+                        stats.cio_irqs[ffs(DSI_CIO_IRQ_##x)-1]);
+
+        seq_printf(s, "-- CIO interrupts --\n");
+        PIS(ERRSYNCESC1);
+        PIS(ERRSYNCESC2);
+        PIS(ERRSYNCESC3);
+        PIS(ERRESC1);
+        PIS(ERRESC2);
+        PIS(ERRESC3);
+        PIS(ERRCONTROL1);
+        PIS(ERRCONTROL2);
+        PIS(ERRCONTROL3);
+        PIS(STATEULPS1);
+        PIS(STATEULPS2);
+        PIS(STATEULPS3);
+        PIS(ERRCONTENTIONLP0_1);
+        PIS(ERRCONTENTIONLP1_1);
+        PIS(ERRCONTENTIONLP0_2);
+        PIS(ERRCONTENTIONLP1_2);
+        PIS(ERRCONTENTIONLP0_3);
+        PIS(ERRCONTENTIONLP1_3);
+        PIS(ULPSACTIVENOT_ALL0);
+        PIS(ULPSACTIVENOT_ALL1);
+#undef PIS
+}
+#endif
+
 void dsi_dump_regs(struct seq_file *s)
 {
 #define DUMPREG(r) seq_printf(s, "%-35s %08x\n", #r, dsi_read_reg(r))
@@ -3637,6 +3757,11 @@ int dsi_init(struct platform_device *pdev)
         spin_lock_init(&dsi.errors_lock);
         dsi.errors = 0;
 
+#ifdef CONFIG_OMAP2_DSS_COLLECT_IRQ_STATS
+        spin_lock_init(&dsi.irq_stats_lock);
+        dsi.irq_stats.last_reset = jiffies;
+#endif
+
         init_completion(&dsi.bta_completion);
         init_completion(&dsi.update_completion);
 
diff --git a/drivers/video/omap2/dss/dss.h b/drivers/video/omap2/dss/dss.h
index 8da5ac42151b..2bcb1245d6c2 100644
--- a/drivers/video/omap2/dss/dss.h
+++ b/drivers/video/omap2/dss/dss.h
@@ -240,6 +240,7 @@ int dsi_init(struct platform_device *pdev);
 void dsi_exit(void);
 
 void dsi_dump_clocks(struct seq_file *s);
+void dsi_dump_irqs(struct seq_file *s);
 void dsi_dump_regs(struct seq_file *s);
 
 void dsi_save_context(void);
@@ -268,6 +269,7 @@ int dpi_init_display(struct omap_dss_device *dssdev);
 int dispc_init(void);
 void dispc_exit(void);
 void dispc_dump_clocks(struct seq_file *s);
+void dispc_dump_irqs(struct seq_file *s);
 void dispc_dump_regs(struct seq_file *s);
 void dispc_irq_handler(void);
 void dispc_fake_vsync_irq(void);
@@ -367,4 +369,16 @@ void rfbi_set_timings(int rfbi_module, struct rfbi_timings *t);
 unsigned long rfbi_get_max_tx_rate(void);
 int rfbi_init_display(struct omap_dss_device *display);
 
+
+#ifdef CONFIG_OMAP2_DSS_COLLECT_IRQ_STATS
+static inline void dss_collect_irq_stats(u32 irqstatus, unsigned *irq_arr)
+{
+        int b;
+        for (b = 0; b < 32; ++b) {
+                if (irqstatus & (1 << b))
+                        irq_arr[b]++;
+        }
+}
+#endif
+
 #endif