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firewire: Make sure we wait for DMA to stop before we reprogram it. 

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Kristian Høgsberg 2007-01-26 00:38:49 -05:00 committed by Stefan Richter
parent 931c4834c8
commit 0edeefd99f
1 changed files with 16 additions and 5 deletions
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21
drivers/firewire/fw-ohci.c
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@ -170,6 +170,8 @@ static inline struct fw_ohci *fw_ohci(struct fw_card *card)
#define OHCI1394_PCI_HCI_Control 0x40
#define SELF_ID_BUF_SIZE 0x800
#define MAX_STOP_CONTEXT_LOOPS 1000
static char ohci_driver_name[] = KBUILD_MODNAME;
static inline void reg_write(const struct fw_ohci *ohci, int offset, u32 data)
@ -224,6 +226,13 @@ static void ar_context_tasklet(unsigned long data)
struct fw_ohci *ohci = ctx->ohci;
struct fw_packet p;
u32 status, length, tcode;
int i;
/* FIXME: We stop and restart the ar context here, what if we
* stop while a receive is in progress? Maybe we could just
* loop the context back to itself and use it in buffer fill
* mode as intended... */
reg_write(ctx->ohci, ctx->control_clear, CONTEXT_RUN);
/* FIXME: What to do about evt_* errors? */
length = le16_to_cpu(ctx->descriptor.req_count) -
@ -287,12 +296,14 @@ static void ar_context_tasklet(unsigned long data)
dma_sync_single_for_device(ohci->card.device, ctx->descriptor_bus,
sizeof ctx->descriptor_bus, DMA_TO_DEVICE);
/* FIXME: We stop and restart the ar context here, what if we
* stop while a receive is in progress? Maybe we could just
* loop the context back to itself and use it in buffer fill
* mode as intended... */
/* Make sure the active bit is 0 before we reprogram the DMA. */
for (i = 0; i < MAX_STOP_CONTEXT_LOOPS; i++)
if (!(reg_read(ctx->ohci,
ctx->control_clear) & CONTEXT_ACTIVE))
break;
if (i == MAX_STOP_CONTEXT_LOOPS)
fw_error("Failed to stop ar context\n");
reg_write(ctx->ohci, ctx->control_clear, CONTEXT_RUN);
ar_context_run(ctx);
}