mISDN: Add feature via MISDN_CTRL_FILL_EMPTY to fill fifo if empty

This prevents underrun of fifo when filled and in case of an underrun it
prevents subsequent underruns due to jitter.
Improve dsp, so buffers are kept filled with a certain delay, so moderate
jitter will not cause underrun all the time -> the audio quality is highly
improved. tones are not interrupted by gaps anymore, except when CPU is
stalling or in high load.

Signed-off-by: Andreas Eversberg <andreas@eversberg.eu>
Signed-off-by: Karsten Keil <kkeil@suse.de>

drivers/isdn/hardware/mISDN/hfc_multi.h

@@ -9,6 +9,7 @@
 #define	DEBUG_HFCMULTI_MODE	0x00100000
 #define	DEBUG_HFCMULTI_MSG	0x00200000
 #define	DEBUG_HFCMULTI_STATE	0x00400000
+#define	DEBUG_HFCMULTI_FILL	0x00800000
 #define	DEBUG_HFCMULTI_SYNC	0x01000000
 #define	DEBUG_HFCMULTI_DTMF	0x02000000
 #define	DEBUG_HFCMULTI_LOCK	0x80000000
@@ -166,6 +167,8 @@ struct hfc_multi {
 
 	u_long		chip;	/* chip configuration */
 	int		masterclk; /* port that provides master clock -1=off */
+	unsigned char	silence;/* silence byte */
+	unsigned char	silence_data[128];/* silence block */
 	int		dtmf;	/* flag that dtmf is currently in process */
 	int		Flen;	/* F-buffer size */
 	int		Zlen;	/* Z-buffer size (must be int for calculation)*/

drivers/isdn/hardware/mISDN/hfc_pci.h

@@ -27,6 +27,7 @@
  */
 #define HFCPCI_BTRANS_THRESHOLD 128
 #define HFCPCI_BTRANS_MAX	256
+#define HFCPCI_FILLEMPTY	64
 #define HFCPCI_BTRANS_THRESMASK 0x00
 
 /* defines for PCI config */

drivers/isdn/hardware/mISDN/hfcmulti.c

@@ -180,7 +180,6 @@ static int nt_t1_count[] = { 3840, 1920, 960, 480, 240, 120, 60, 30  };
 #define	CLKDEL_TE	0x0f	/* CLKDEL in TE mode */
 #define	CLKDEL_NT	0x6c	/* CLKDEL in NT mode
 				   (0x60 MUST be included!) */
-static u_char silence =	0xff;	/* silence by LAW */
 
 #define	DIP_4S	0x1		/* DIP Switches for Beronet 1S/2S/4S cards */
 #define	DIP_8S	0x2		/* DIP Switches for Beronet 8S+ cards */
@@ -1975,6 +1974,17 @@ next_frame:
 		return; /* no data */
 	}
 
+	/* "fill fifo if empty" feature */
+	if (bch && test_bit(FLG_FILLEMPTY, &bch->Flags)
+		&& !test_bit(FLG_HDLC, &bch->Flags) && z2 == z1) {
+		if (debug & DEBUG_HFCMULTI_FILL)
+			printk(KERN_DEBUG "%s: buffer empty, so we have "
+				"underrun\n", __func__);
+		/* fill buffer, to prevent future underrun */
+		hc->write_fifo(hc, hc->silence_data, poll >> 1);
+		Zspace -= (poll >> 1);
+	}
+
 	/* if audio data and connected slot */
 	if (bch && (!test_bit(FLG_HDLC, &bch->Flags)) && (!*txpending)
 		&& slot_tx >= 0) {
@@ -2011,7 +2021,6 @@ next_frame:
 			__func__, hc->id + 1, ch, Zspace, z1, z2, ii-i, len-i,
 			temp ? "HDLC":"TRANS");
 
-
 	/* Have to prep the audio data */
 	hc->write_fifo(hc, d, ii - i);
 	*idxp = ii;
@@ -2050,7 +2059,7 @@ next_frame:
 	 * no more data at all. this prevents sending an undefined value.
 	 */
 	if (bch && test_bit(FLG_TRANSPARENT, &bch->Flags))
-		HFC_outb_nodebug(hc, A_FIFO_DATA0_NOINC, silence);
+		HFC_outb_nodebug(hc, A_FIFO_DATA0_NOINC, hc->silence);
 }
 
 
@@ -2932,7 +2941,7 @@ mode_hfcmulti(struct hfc_multi *hc, int ch, int protocol, int slot_tx,
 			HFC_outb(hc, R_INC_RES_FIFO, V_RES_F);
 			HFC_wait(hc);
 			/* tx silence */
-			HFC_outb_nodebug(hc, A_FIFO_DATA0_NOINC, silence);
+			HFC_outb_nodebug(hc, A_FIFO_DATA0_NOINC, hc->silence);
 			HFC_outb(hc, R_SLOT, (((ch / 4) * 8) +
 			    ((ch % 4) * 4)) << 1);
 			HFC_outb(hc, A_SL_CFG, 0x80 | 0x20 | (ch << 1));
@@ -2947,7 +2956,7 @@ mode_hfcmulti(struct hfc_multi *hc, int ch, int protocol, int slot_tx,
 			HFC_outb(hc, R_INC_RES_FIFO, V_RES_F);
 			HFC_wait(hc);
 			/* tx silence */
-			HFC_outb_nodebug(hc, A_FIFO_DATA0_NOINC, silence);
+			HFC_outb_nodebug(hc, A_FIFO_DATA0_NOINC, hc->silence);
 			/* enable RX fifo */
 			HFC_outb(hc, R_FIFO, (ch<<1)|1);
 			HFC_wait(hc);
@@ -3439,7 +3448,7 @@ channel_bctrl(struct bchannel *bch, struct mISDN_ctrl_req *cq)
 	switch (cq->op) {
 	case MISDN_CTRL_GETOP:
 		cq->op = MISDN_CTRL_HFC_OP | MISDN_CTRL_HW_FEATURES_OP
-			| MISDN_CTRL_RX_OFF;
+			| MISDN_CTRL_RX_OFF | MISDN_CTRL_FILL_EMPTY;
 		break;
 	case MISDN_CTRL_RX_OFF: /* turn off / on rx stream */
 		hc->chan[bch->slot].rx_off = !!cq->p1;
@@ -3454,6 +3463,12 @@ channel_bctrl(struct bchannel *bch, struct mISDN_ctrl_req *cq)
 			printk(KERN_DEBUG "%s: RX_OFF request (nr=%d off=%d)\n",
 			    __func__, bch->nr, hc->chan[bch->slot].rx_off);
 		break;
+	case MISDN_CTRL_FILL_EMPTY: /* fill fifo, if empty */
+		test_and_set_bit(FLG_FILLEMPTY, &bch->Flags);
+		if (debug & DEBUG_HFCMULTI_MSG)
+			printk(KERN_DEBUG "%s: FILL_EMPTY request (nr=%d "
+				"off=%d)\n", __func__, bch->nr, !!cq->p1);
+		break;
 	case MISDN_CTRL_HW_FEATURES: /* fill features structure */
 		if (debug & DEBUG_HFCMULTI_MSG)
 			printk(KERN_DEBUG "%s: HW_FEATURE request\n",
@@ -3970,6 +3985,7 @@ open_bchannel(struct hfc_multi *hc, struct dchannel *dch,
 	}
 	if (test_and_set_bit(FLG_OPEN, &bch->Flags))
 		return -EBUSY; /* b-channel can be only open once */
+	test_and_clear_bit(FLG_FILLEMPTY, &bch->Flags);
 	bch->ch.protocol = rq->protocol;
 	hc->chan[ch].rx_off = 0;
 	rq->ch = &bch->ch;
@@ -4806,6 +4822,7 @@ hfcmulti_init(struct pci_dev *pdev, const struct pci_device_id *ent)
 	struct hfc_multi	*hc;
 	u_long		flags;
 	u_char		dips = 0, pmj = 0; /* dip settings, port mode Jumpers */
+	int		i;
 
 	if (HFC_cnt >= MAX_CARDS) {
 		printk(KERN_ERR "too many cards (max=%d).\n",
@@ -4839,11 +4856,11 @@ hfcmulti_init(struct pci_dev *pdev, const struct pci_device_id *ent)
 	hc->id = HFC_cnt;
 	hc->pcm = pcm[HFC_cnt];
 	hc->io_mode = iomode[HFC_cnt];
-	if (dslot[HFC_cnt] < 0) {
+	if (dslot[HFC_cnt] < 0 && hc->type == 1) {
 		hc->dslot = 0;
 		printk(KERN_INFO "HFC-E1 card has disabled D-channel, but "
 			"31 B-channels\n");
-	} if (dslot[HFC_cnt] > 0 && dslot[HFC_cnt] < 32) {
+	} if (dslot[HFC_cnt] > 0 && dslot[HFC_cnt] < 32 && hc->type == 1) {
 		hc->dslot = dslot[HFC_cnt];
 		printk(KERN_INFO "HFC-E1 card has alternating D-channel on "
 			"time slot %d\n", dslot[HFC_cnt]);
@@ -4854,9 +4871,17 @@ hfcmulti_init(struct pci_dev *pdev, const struct pci_device_id *ent)
 	hc->masterclk = -1;
 	if (type[HFC_cnt] & 0x100) {
 		test_and_set_bit(HFC_CHIP_ULAW, &hc->chip);
-		silence = 0xff; /* ulaw silence */
+		hc->silence = 0xff; /* ulaw silence */
 	} else
-		silence = 0x2a; /* alaw silence */
+		hc->silence = 0x2a; /* alaw silence */
+	if ((poll >> 1) > sizeof(hc->silence_data)) {
+		printk(KERN_ERR "HFCMULTI error: silence_data too small, "
+			"please fix\n");
+		return -EINVAL;
+	}
+	for (i = 0; i < (poll >> 1); i++)
+		hc->silence_data[i] = hc->silence;
+
 	if (!(type[HFC_cnt] & 0x200))
 		test_and_set_bit(HFC_CHIP_DTMF, &hc->chip);
 

drivers/isdn/hardware/mISDN/hfcpci.c

@@ -751,6 +751,36 @@ hfcpci_fill_fifo(struct bchannel *bch)
 			    /* fcnt contains available bytes in fifo */
 		fcnt = B_FIFO_SIZE - fcnt;
 		    /* remaining bytes to send (bytes in fifo) */
+
+		/* "fill fifo if empty" feature */
+		if (test_bit(FLG_FILLEMPTY, &bch->Flags) && !fcnt) {
+			/* printk(KERN_DEBUG "%s: buffer empty, so we have "
+				"underrun\n", __func__); */
+			/* fill buffer, to prevent future underrun */
+			count = HFCPCI_FILLEMPTY;
+			new_z1 = le16_to_cpu(*z1t) + count;
+			   /* new buffer Position */
+			if (new_z1 >= (B_FIFO_SIZE + B_SUB_VAL))
+				new_z1 -= B_FIFO_SIZE;	/* buffer wrap */
+			dst = bdata + (le16_to_cpu(*z1t) - B_SUB_VAL);
+			maxlen = (B_FIFO_SIZE + B_SUB_VAL) - le16_to_cpu(*z1t);
+			    /* end of fifo */
+			if (bch->debug & DEBUG_HW_BFIFO)
+				printk(KERN_DEBUG "hfcpci_FFt fillempty "
+				    "fcnt(%d) maxl(%d) nz1(%x) dst(%p)\n",
+				    fcnt, maxlen, new_z1, dst);
+			fcnt += count;
+			if (maxlen > count)
+				maxlen = count; 	/* limit size */
+			memset(dst, 0x2a, maxlen);	/* first copy */
+			count -= maxlen;		/* remaining bytes */
+			if (count) {
+				dst = bdata;		/* start of buffer */
+				memset(dst, 0x2a, count);
+			}
+			*z1t = cpu_to_le16(new_z1);	/* now send data */
+		}
+
 next_t_frame:
 		count = bch->tx_skb->len - bch->tx_idx;
 		/* maximum fill shall be HFCPCI_BTRANS_MAX */
@@ -1481,11 +1511,17 @@ deactivate_bchannel(struct bchannel *bch)
 static int
 channel_bctrl(struct bchannel *bch, struct mISDN_ctrl_req *cq)
 {
-	int			ret = 0;
+	int	ret = 0;
 
 	switch (cq->op) {
 	case MISDN_CTRL_GETOP:
-		cq->op = 0;
+		cq->op = MISDN_CTRL_FILL_EMPTY;
+		break;
+	case MISDN_CTRL_FILL_EMPTY: /* fill fifo, if empty */
+		test_and_set_bit(FLG_FILLEMPTY, &bch->Flags);
+		if (debug & DEBUG_HW_OPEN)
+			printk(KERN_DEBUG "%s: FILL_EMPTY request (nr=%d "
+				"off=%d)\n", __func__, bch->nr, !!cq->p1);
 		break;
 	default:
 		printk(KERN_WARNING "%s: unknown Op %x\n", __func__, cq->op);
@@ -1903,6 +1939,7 @@ open_bchannel(struct hfc_pci *hc, struct channel_req *rq)
 	bch = &hc->bch[rq->adr.channel - 1];
 	if (test_and_set_bit(FLG_OPEN, &bch->Flags))
 		return -EBUSY; /* b-channel can be only open once */
+	test_and_clear_bit(FLG_FILLEMPTY, &bch->Flags);
 	bch->ch.protocol = rq->protocol;
 	rq->ch = &bch->ch; /* TODO: E-channel */
 	if (!try_module_get(THIS_MODULE))

drivers/isdn/mISDN/dsp.h

@@ -198,6 +198,7 @@ struct dsp {
 	/* hardware stuff */
 	struct dsp_features features;
 	int		features_rx_off; /* set if rx_off is featured */
+	int		features_fill_empty; /* set if fill_empty is featured */
 	int		pcm_slot_rx; /* current PCM slot (or -1) */
 	int		pcm_bank_rx;
 	int		pcm_slot_tx;

drivers/isdn/mISDN/dsp_cmx.c

@@ -1168,11 +1168,18 @@ dsp_cmx_receive(struct dsp *dsp, struct sk_buff *skb)
 		dsp->rx_init = 0;
 		if (dsp->features.unordered) {
 			dsp->rx_R = (hh->id & CMX_BUFF_MASK);
-			dsp->rx_W = (dsp->rx_R + dsp->cmx_delay)
-				& CMX_BUFF_MASK;
+			if (dsp->cmx_delay)
+				dsp->rx_W = (dsp->rx_R + dsp->cmx_delay)
+					& CMX_BUFF_MASK;
+			else
+				dsp->rx_W = (dsp->rx_R + (dsp_poll >> 1))
+					& CMX_BUFF_MASK;
 		} else {
 			dsp->rx_R = 0;
-			dsp->rx_W = dsp->cmx_delay;
+			if (dsp->cmx_delay)
+				dsp->rx_W = dsp->cmx_delay;
+			else
+				dsp->rx_W = dsp_poll >> 1;
 		}
 	}
 	/* if frame contains time code, write directly */
@@ -1190,14 +1197,20 @@ dsp_cmx_receive(struct dsp *dsp, struct sk_buff *skb)
 			    "cmx_receive(dsp=%lx): UNDERRUN (or overrun the "
 			    "maximum delay), adjusting read pointer! "
 			    "(inst %s)\n", (u_long)dsp, dsp->name);
-		/* flush buffer */
+		/* flush rx buffer and set delay to dsp_poll / 2 */
 		if (dsp->features.unordered) {
 			dsp->rx_R = (hh->id & CMX_BUFF_MASK);
-			dsp->rx_W = (dsp->rx_R + dsp->cmx_delay)
-				& CMX_BUFF_MASK;
+			if (dsp->cmx_delay)
+				dsp->rx_W = (dsp->rx_R + dsp->cmx_delay)
+					& CMX_BUFF_MASK;
+				dsp->rx_W = (dsp->rx_R + (dsp_poll >> 1))
+					& CMX_BUFF_MASK;
 		} else {
 			dsp->rx_R = 0;
-			dsp->rx_W = dsp->cmx_delay;
+			if (dsp->cmx_delay)
+				dsp->rx_W = dsp->cmx_delay;
+			else
+				dsp->rx_W = dsp_poll >> 1;
 		}
 		memset(dsp->rx_buff, dsp_silence, sizeof(dsp->rx_buff));
 	}
@@ -1360,8 +1373,11 @@ dsp_cmx_send_member(struct dsp *dsp, int len, s32 *c, int members)
 				t = (t+1) & CMX_BUFF_MASK;
 				r = (r+1) & CMX_BUFF_MASK;
 			}
-			if (r != rr)
+			if (r != rr) {
+				printk(KERN_DEBUG "%s: buffer empty\n",
+					__func__);
 				memset(d, dsp_silence, (rr-r)&CMX_BUFF_MASK);
+			}
 		/* -> if echo is enabled */
 		} else {
 			/*
@@ -1704,9 +1720,10 @@ dsp_cmx_send(void *arg)
 			}
 			/*
 			 * remove rx_delay only if we have delay AND we
-			 * have not preset cmx_delay
+			 * have not preset cmx_delay AND
+			 * the delay is greater dsp_poll
 			 */
-			if (delay && !dsp->cmx_delay) {
+			if (delay > dsp_poll && !dsp->cmx_delay) {
 				if (dsp_debug & DEBUG_DSP_CMX)
 					printk(KERN_DEBUG
 					    "%s lowest rx_delay of %d bytes for"
@@ -1714,7 +1731,8 @@ dsp_cmx_send(void *arg)
 					    __func__, delay,
 					    dsp->name);
 				r = dsp->rx_R;
-				rr = (r + delay) & CMX_BUFF_MASK;
+				rr = (r + delay - (dsp_poll >> 1))
+					& CMX_BUFF_MASK;
 				/* delete rx-data */
 				while (r != rr) {
 					p[r] = dsp_silence;
@@ -1736,7 +1754,7 @@ dsp_cmx_send(void *arg)
 			 * remove delay only if we have delay AND we
 			 * have enabled tx_dejitter
 			 */
-			if (delay && dsp->tx_dejitter) {
+			if (delay > dsp_poll && dsp->tx_dejitter) {
 				if (dsp_debug & DEBUG_DSP_CMX)
 					printk(KERN_DEBUG
 					    "%s lowest tx_delay of %d bytes for"
@@ -1744,7 +1762,8 @@ dsp_cmx_send(void *arg)
 					    __func__, delay,
 					    dsp->name);
 				r = dsp->tx_R;
-				rr = (r + delay) & CMX_BUFF_MASK;
+				rr = (r + delay - (dsp_poll >> 1))
+					& CMX_BUFF_MASK;
 				/* delete tx-data */
 				while (r != rr) {
 					q[r] = dsp_silence;
@@ -1797,14 +1816,13 @@ dsp_cmx_transmit(struct dsp *dsp, struct sk_buff *skb)
 	ww = dsp->tx_R;
 	p = dsp->tx_buff;
 	d = skb->data;
-	space = ww-w;
-	if (space <= 0)
-		space += CMX_BUFF_SIZE;
+	space = (ww - w - 1) & CMX_BUFF_MASK;
 	/* write-pointer should not overrun nor reach read pointer */
-	if (space-1 < skb->len)
+	if (space < skb->len) {
 		/* write to the space we have left */
-		ww = (ww - 1) & CMX_BUFF_MASK;
-	else
+		ww = (ww - 1) & CMX_BUFF_MASK; /* end one byte prior tx_R */
+		printk(KERN_DEBUG "%s: buffer overflow\n", __func__);
+	} else
 		/* write until all byte are copied */
 		ww = (w + skb->len) & CMX_BUFF_MASK;
 	dsp->tx_W = ww;

drivers/isdn/mISDN/dsp_core.c

@@ -191,6 +191,8 @@ dsp_rx_off_member(struct dsp *dsp)
 	struct mISDN_ctrl_req	cq;
 	int rx_off = 1;
 
+	memset(&cq, 0, sizeof(cq));
+
 	if (!dsp->features_rx_off)
 		return;
 
@@ -249,6 +251,32 @@ dsp_rx_off(struct dsp *dsp)
 	}
 }
 
+/* enable "fill empty" feature */
+static void
+dsp_fill_empty(struct dsp *dsp)
+{
+	struct mISDN_ctrl_req	cq;
+
+	memset(&cq, 0, sizeof(cq));
+
+	if (!dsp->ch.peer) {
+		if (dsp_debug & DEBUG_DSP_CORE)
+			printk(KERN_DEBUG "%s: no peer, no fill_empty\n",
+				__func__);
+		return;
+	}
+	cq.op = MISDN_CTRL_FILL_EMPTY;
+	cq.p1 = 1;
+	if (dsp->ch.peer->ctrl(dsp->ch.peer, CONTROL_CHANNEL, &cq)) {
+		printk(KERN_DEBUG "%s: CONTROL_CHANNEL failed\n",
+			__func__);
+		return;
+	}
+	if (dsp_debug & DEBUG_DSP_CORE)
+		printk(KERN_DEBUG "%s: %s set fill_empty = 1\n",
+			__func__, dsp->name);
+}
+
 static int
 dsp_control_req(struct dsp *dsp, struct mISDNhead *hh, struct sk_buff *skb)
 {
@@ -593,8 +621,6 @@ get_features(struct mISDNchannel *ch)
 	struct dsp		*dsp = container_of(ch, struct dsp, ch);
 	struct mISDN_ctrl_req	cq;
 
-	if (dsp_options & DSP_OPT_NOHARDWARE)
-		return;
 	if (!ch->peer) {
 		if (dsp_debug & DEBUG_DSP_CORE)
 			printk(KERN_DEBUG "%s: no peer, no features\n",
@@ -610,6 +636,10 @@ get_features(struct mISDNchannel *ch)
 	}
 	if (cq.op & MISDN_CTRL_RX_OFF)
 		dsp->features_rx_off = 1;
+	if (cq.op & MISDN_CTRL_FILL_EMPTY)
+		dsp->features_fill_empty = 1;
+	if (dsp_options & DSP_OPT_NOHARDWARE)
+		return;
 	if ((cq.op & MISDN_CTRL_HW_FEATURES_OP)) {
 		cq.op = MISDN_CTRL_HW_FEATURES;
 		*((u_long *)&cq.p1) = (u_long)&dsp->features;
@@ -865,6 +895,9 @@ dsp_function(struct mISDNchannel *ch,  struct sk_buff *skb)
 		if (dsp->dtmf.hardware || dsp->dtmf.software)
 			dsp_dtmf_goertzel_init(dsp);
 		get_features(ch);
+		/* enable fill_empty feature */
+		if (dsp->features_fill_empty)
+			dsp_fill_empty(dsp);
 		/* send ph_activate */
 		hh->prim = PH_ACTIVATE_REQ;
 		if (ch->peer)

include/linux/mISDNhw.h

@@ -57,20 +57,21 @@
 #define FLG_L2DATA		14	/* channel use L2 DATA primitivs */
 #define FLG_ORIGIN		15	/* channel is on origin site */
 /* channel specific stuff */
+#define FLG_FILLEMPTY		16	/* fill fifo on first frame (empty) */
 /* arcofi specific */
-#define FLG_ARCOFI_TIMER	16
-#define FLG_ARCOFI_ERROR	17
+#define FLG_ARCOFI_TIMER	17
+#define FLG_ARCOFI_ERROR	18
 /* isar specific */
-#define FLG_INITIALIZED		16
-#define FLG_DLEETX		17
-#define FLG_LASTDLE		18
-#define FLG_FIRST		19
-#define FLG_LASTDATA		20
-#define FLG_NMD_DATA		21
-#define FLG_FTI_RUN		22
-#define FLG_LL_OK		23
-#define FLG_LL_CONN		24
-#define FLG_DTMFSEND		25
+#define FLG_INITIALIZED		17
+#define FLG_DLEETX		18
+#define FLG_LASTDLE		19
+#define FLG_FIRST		20
+#define FLG_LASTDATA		21
+#define FLG_NMD_DATA		22
+#define FLG_FTI_RUN		23
+#define FLG_LL_OK		24
+#define FLG_LL_CONN		25
+#define FLG_DTMFSEND		26
 
 /* workq events */
 #define FLG_RECVQUEUE		30

include/linux/mISDNif.h

@@ -312,6 +312,7 @@ clear_channelmap(u_int nr, u_char *map)
 #define MISDN_CTRL_SETPEER		0x0040
 #define MISDN_CTRL_UNSETPEER		0x0080
 #define MISDN_CTRL_RX_OFF		0x0100
+#define MISDN_CTRL_FILL_EMPTY		0x0200
 #define MISDN_CTRL_HW_FEATURES_OP	0x2000
 #define MISDN_CTRL_HW_FEATURES		0x2001
 #define MISDN_CTRL_HFC_OP		0x4000