From 0b2dcd5d6a9a3e27fdd67053e526388f9f2ea33b Mon Sep 17 00:00:00 2001 From: Andreas Mohr Date: Tue, 28 Mar 2006 12:56:14 +0200 Subject: [ALSA] maestro3.c: fix BUG, optimization - fix brown-paper-bag locking bug (lock() / return / unlock()) - improve central function snd_m3_update_ptr() (avoid expensive integer divisions) - add cpu_relax() to busy-wait I/O loop as recommended (does this require special macro support in ALSA for older kernels??) - constify several structs - spelling updates Signed-off-by: Andreas Mohr Signed-off-by: Takashi Iwai --- sound/pci/maestro3.c | 57 ++++++++++++++++++++++++++++++++++------------------ 1 file changed, 37 insertions(+), 20 deletions(-) (limited to 'sound/pci/maestro3.c') diff --git a/sound/pci/maestro3.c b/sound/pci/maestro3.c index 44393e190929..9c90d901e6b9 100644 --- a/sound/pci/maestro3.c +++ b/sound/pci/maestro3.c @@ -831,8 +831,8 @@ struct snd_m3 { struct snd_pcm *pcm; struct pci_dev *pci; - struct m3_quirk *quirk; - struct m3_hv_quirk *hv_quirk; + const struct m3_quirk *quirk; + const struct m3_hv_quirk *hv_quirk; int dacs_active; int timer_users; @@ -892,7 +892,7 @@ static struct pci_device_id snd_m3_ids[] = { MODULE_DEVICE_TABLE(pci, snd_m3_ids); -static struct m3_quirk m3_quirk_list[] = { +static const struct m3_quirk m3_quirk_list[] = { /* panasonic CF-28 "toughbook" */ { .name = "Panasonic CF-28", @@ -950,7 +950,7 @@ static struct m3_quirk m3_quirk_list[] = { }; /* These values came from the Windows driver. */ -static struct m3_hv_quirk m3_hv_quirk_list[] = { +static const struct m3_hv_quirk m3_hv_quirk_list[] = { /* Allegro chips */ { 0x125D, 0x1988, 0x0E11, 0x002E, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD, 0 }, { 0x125D, 0x1988, 0x0E11, 0x0094, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD, 0 }, @@ -1361,7 +1361,7 @@ static void snd_m3_pcm_setup2(struct snd_m3 *chip, struct m3_dma *s, } -static struct play_vals { +static const struct play_vals { u16 addr, val; } pv[] = { {CDATA_LEFT_VOLUME, ARB_VOLUME}, @@ -1428,7 +1428,7 @@ snd_m3_playback_setup(struct snd_m3 *chip, struct m3_dma *s, /* * Native record driver */ -static struct rec_vals { +static const struct rec_vals { u16 addr, val; } rv[] = { {CDATA_LEFT_VOLUME, ARB_VOLUME}, @@ -1598,12 +1598,26 @@ static void snd_m3_update_ptr(struct snd_m3 *chip, struct m3_dma *s) if (! s->running) return; - hwptr = snd_m3_get_pointer(chip, s, subs) % s->dma_size; - diff = (s->dma_size + hwptr - s->hwptr) % s->dma_size; + hwptr = snd_m3_get_pointer(chip, s, subs); + + /* try to avoid expensive modulo divisions */ + if (hwptr >= s->dma_size) + hwptr %= s->dma_size; + + diff = s->dma_size + hwptr - s->hwptr; + if (diff >= s->dma_size) + diff %= s->dma_size; + s->hwptr = hwptr; s->count += diff; + if (s->count >= (signed)s->period_size) { - s->count %= s->period_size; + + if (s->count < 2 * (signed)s->period_size) + s->count -= (signed)s->period_size; + else + s->count %= s->period_size; + spin_unlock(&chip->reg_lock); snd_pcm_period_elapsed(subs); spin_lock(&chip->reg_lock); @@ -1942,6 +1956,7 @@ static int snd_m3_ac97_wait(struct snd_m3 *chip) do { if (! (snd_m3_inb(chip, 0x30) & 1)) return 0; + cpu_relax(); } while (i-- > 0); snd_printk(KERN_ERR "ac97 serial bus busy\n"); @@ -1953,16 +1968,18 @@ snd_m3_ac97_read(struct snd_ac97 *ac97, unsigned short reg) { struct snd_m3 *chip = ac97->private_data; unsigned long flags; - unsigned short data; + unsigned short data = 0xffff; if (snd_m3_ac97_wait(chip)) - return 0xffff; + goto fail; spin_lock_irqsave(&chip->ac97_lock, flags); snd_m3_outb(chip, 0x80 | (reg & 0x7f), CODEC_COMMAND); if (snd_m3_ac97_wait(chip)) - return 0xffff; + goto fail_unlock; data = snd_m3_inw(chip, CODEC_DATA); +fail_unlock: spin_unlock_irqrestore(&chip->ac97_lock, flags); +fail: return data; } @@ -2121,7 +2138,7 @@ static int __devinit snd_m3_mixer(struct snd_m3 *chip) * DSP Code images */ -static u16 assp_kernel_image[] __devinitdata = { +static const u16 assp_kernel_image[] __devinitdata = { 0x7980, 0x0030, 0x7980, 0x03B4, 0x7980, 0x03B4, 0x7980, 0x00FB, 0x7980, 0x00DD, 0x7980, 0x03B4, 0x7980, 0x0332, 0x7980, 0x0287, 0x7980, 0x03B4, 0x7980, 0x03B4, 0x7980, 0x03B4, 0x7980, 0x03B4, 0x7980, 0x031A, 0x7980, 0x03B4, 0x7980, 0x022F, 0x7980, 0x03B4, 0x7980, 0x03B4, 0x7980, 0x03B4, @@ -2208,7 +2225,7 @@ static u16 assp_kernel_image[] __devinitdata = { * Mini sample rate converter code image * that is to be loaded at 0x400 on the DSP. */ -static u16 assp_minisrc_image[] __devinitdata = { +static const u16 assp_minisrc_image[] __devinitdata = { 0xBF80, 0x101E, 0x906E, 0x006E, 0x8B88, 0x6980, 0xEF88, 0x906F, 0x0D6F, 0x6900, 0xEB08, 0x0412, 0xBC20, 0x696E, 0xB801, 0x906E, 0x7980, 0x0403, 0xB90E, 0x8807, 0xBE43, 0xBF01, 0xBE47, 0xBE41, @@ -2251,7 +2268,7 @@ static u16 assp_minisrc_image[] __devinitdata = { */ #define MINISRC_LPF_LEN 10 -static u16 minisrc_lpf[MINISRC_LPF_LEN] __devinitdata = { +static const u16 minisrc_lpf[MINISRC_LPF_LEN] __devinitdata = { 0X0743, 0X1104, 0X0A4C, 0XF88D, 0X242C, 0X1023, 0X1AA9, 0X0B60, 0XEFDD, 0X186F }; @@ -2358,7 +2375,7 @@ static int __devinit snd_m3_assp_client_init(struct snd_m3 *chip, struct m3_dma */ /* - * align instance address to 256 bytes so that it's + * align instance address to 256 bytes so that its * shifted list address is aligned. * list address = (mem address >> 1) >> 7; */ @@ -2647,8 +2664,8 @@ snd_m3_create(struct snd_card *card, struct pci_dev *pci, { struct snd_m3 *chip; int i, err; - struct m3_quirk *quirk; - struct m3_hv_quirk *hv_quirk; + const struct m3_quirk *quirk; + const struct m3_hv_quirk *hv_quirk; static struct snd_device_ops ops = { .dev_free = snd_m3_dev_free, }; @@ -2843,12 +2860,12 @@ snd_m3_probe(struct pci_dev *pci, const struct pci_device_id *pci_id) } #if 0 /* TODO: not supported yet */ - /* TODO enable midi irq and i/o */ + /* TODO enable MIDI IRQ and I/O */ err = snd_mpu401_uart_new(chip->card, 0, MPU401_HW_MPU401, chip->iobase + MPU401_DATA_PORT, 1, chip->irq, 0, &chip->rmidi); if (err < 0) - printk(KERN_WARNING "maestro3: no midi support.\n"); + printk(KERN_WARNING "maestro3: no MIDI support.\n"); #endif pci_set_drvdata(pci, card); -- cgit v1.2.3-59-g8ed1b