From 59fd8f8d8ee9f7539758419965381bcccfa6f798 Mon Sep 17 00:00:00 2001 From: Trent Piepho Date: Sat, 18 Aug 2007 22:09:42 -0300 Subject: [PATCH] V4L/DVB (6066): cx88-alsa: Change order of interrupt enabling, fix spurious IRQs Currently the driver turns on audio interrupts, then sets the audio interrupt mask to select which interrupts to get. One could received unwanted interrupts since the mask is set _after_ interrupts have already been turned on. Change the order of the operations, and clear any audio interrupt status bits that are already set for good measure. Before changing the SRAM FIFO parameters, make sure the FIFO isn't being used. This shouldn't happen with just the ALSA driver, as it should never try to turn on FIFO/RISC/DMA while they are already on. However, the V4L driver needs to turn the audio FIFO on for analog audio output to work (undocumented cx88 bug). The FIFO parameters are in an inconsistent state while they are updated, and this results in many FIFO sync error IRQs if the FIFO is in use while it's in this inconsistent state. Also create and use a bunch of symbolic constants for audio interrupt mask bits. Signed-off-by: Trent Piepho Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/cx88/cx88-alsa.c | 42 +++++++++++++--------------- drivers/media/video/cx88/cx88-reg.h | 13 +++++++++ 2 files changed, 33 insertions(+), 22 deletions(-) diff --git a/drivers/media/video/cx88/cx88-alsa.c b/drivers/media/video/cx88/cx88-alsa.c index 76a8c01208..ecb9a74ae0 100644 --- a/drivers/media/video/cx88/cx88-alsa.c +++ b/drivers/media/video/cx88/cx88-alsa.c @@ -136,12 +136,11 @@ static int _cx88_start_audio_dma(snd_cx88_card_t *chip) struct cx88_core *core=chip->core; struct sram_channel *audio_ch = &cx88_sram_channels[SRAM_CH25]; - - dprintk(1, "Starting audio DMA for %i bytes/line and %i (%i) lines at address %08x\n",buf->bpl, chip->num_periods, audio_ch->fifo_size / buf->bpl, audio_ch->fifo_start); + /* Make sure RISC/FIFO are off before changing FIFO/RISC settings */ + cx_clear(MO_AUD_DMACNTRL, 0x11); /* setup fifo + format - out channel */ - cx88_sram_channel_setup(chip->core, &cx88_sram_channels[SRAM_CH25], - buf->bpl, buf->risc.dma); + cx88_sram_channel_setup(chip->core, audio_ch, buf->bpl, buf->risc.dma); /* sets bpl size */ cx_write(MO_AUDD_LNGTH, buf->bpl); @@ -149,27 +148,30 @@ static int _cx88_start_audio_dma(snd_cx88_card_t *chip) /* reset counter */ cx_write(MO_AUDD_GPCNTRL,GP_COUNT_CONTROL_RESET); + dprintk(1, "Start audio DMA, %d B/line, %d lines/FIFO, %d lines/irq, " + "%d B/irq\n", buf->bpl, cx_read(audio_ch->cmds_start + 8)>>1, + chip->num_periods, buf->bpl * chip->num_periods); + dprintk(1, "Enabling IRQ, setting mask from 0x%x to 0x%x\n", chip->core->pci_irqmask, chip->core->pci_irqmask | PCI_INT_AUDINT); - /* enable irqs */ - cx_set(MO_PCI_INTMSK, chip->core->pci_irqmask | PCI_INT_AUDINT); - /* Enables corresponding bits at AUD_INT_STAT */ - cx_write(MO_AUD_INTMSK, - (1<<16)| - (1<<12)| - (1<<4)| - (1<<0) - ); + cx_write(MO_AUD_INTMSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC | + AUD_INT_DN_RISCI2 | AUD_INT_DN_RISCI1); + + /* Clean any pending interrupt bits already set */ + cx_write(MO_AUD_INTSTAT, ~0); + + /* enable audio irqs */ + cx_set(MO_PCI_INTMSK, chip->core->pci_irqmask | PCI_INT_AUDINT); /* start dma */ cx_set(MO_DEV_CNTRL2, (1<<5)); /* Enables Risc Processor */ cx_set(MO_AUD_DMACNTRL, 0x11); /* audio downstream FIFO and RISC enable */ if (debug) - cx88_sram_channel_dump(chip->core, &cx88_sram_channels[SRAM_CH25]); + cx88_sram_channel_dump(chip->core, audio_ch); return 0; } @@ -187,12 +189,8 @@ static int _cx88_stop_audio_dma(snd_cx88_card_t *chip) /* disable irqs */ cx_clear(MO_PCI_INTMSK, PCI_INT_AUDINT); - cx_clear(MO_AUD_INTMSK, - (1<<16)| - (1<<12)| - (1<<4)| - (1<<0) - ); + cx_clear(MO_AUD_INTMSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC | + AUD_INT_DN_RISCI2 | AUD_INT_DN_RISCI1); if (debug) cx88_sram_channel_dump(chip->core, &cx88_sram_channels[SRAM_CH25]); @@ -239,14 +237,14 @@ static void cx8801_aud_irq(snd_cx88_card_t *chip) cx88_aud_irqs, ARRAY_SIZE(cx88_aud_irqs), status, mask); /* risc op code error */ - if (status & (1 << 16)) { + if (status & AUD_INT_OPC_ERR) { printk(KERN_WARNING "%s/0: audio risc op code error\n",core->name); cx_clear(MO_AUD_DMACNTRL, 0x11); cx88_sram_channel_dump(core, &cx88_sram_channels[SRAM_CH25]); } /* risc1 downstream */ - if (status & 0x01) { + if (status & AUD_INT_DN_RISCI1) { spin_lock(&chip->reg_lock); count = cx_read(MO_AUDD_GPCNT); spin_unlock(&chip->reg_lock); diff --git a/drivers/media/video/cx88/cx88-reg.h b/drivers/media/video/cx88/cx88-reg.h index 2b1d102cd2..2ec52d1cde 100644 --- a/drivers/media/video/cx88/cx88-reg.h +++ b/drivers/media/video/cx88/cx88-reg.h @@ -612,6 +612,19 @@ #define SEL_FMRADIO 0x20 // AUD_CTL +#define AUD_INT_DN_RISCI1 (1 << 0) +#define AUD_INT_UP_RISCI1 (1 << 1) +#define AUD_INT_RDS_DN_RISCI1 (1 << 2) +#define AUD_INT_DN_RISCI2 (1 << 4) /* yes, 3 is skipped */ +#define AUD_INT_UP_RISCI2 (1 << 5) +#define AUD_INT_RDS_DN_RISCI2 (1 << 6) +#define AUD_INT_DN_SYNC (1 << 12) +#define AUD_INT_UP_SYNC (1 << 13) +#define AUD_INT_RDS_DN_SYNC (1 << 14) +#define AUD_INT_OPC_ERR (1 << 16) +#define AUD_INT_BER_IRQ (1 << 20) +#define AUD_INT_MCHG_IRQ (1 << 21) + #define EN_BTSC_FORCE_MONO 0 #define EN_BTSC_FORCE_STEREO 1 #define EN_BTSC_FORCE_SAP 2 -- 2.39.5