提交 0edeefd9 编写于 作者: K Kristian Høgsberg 提交者: Stefan Richter

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

Signed-off-by: NKristian Høgsberg <krh@redhat.com>
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>
上级 931c4834
...@@ -170,6 +170,8 @@ static inline struct fw_ohci *fw_ohci(struct fw_card *card) ...@@ -170,6 +170,8 @@ static inline struct fw_ohci *fw_ohci(struct fw_card *card)
#define OHCI1394_PCI_HCI_Control 0x40 #define OHCI1394_PCI_HCI_Control 0x40
#define SELF_ID_BUF_SIZE 0x800 #define SELF_ID_BUF_SIZE 0x800
#define MAX_STOP_CONTEXT_LOOPS 1000
static char ohci_driver_name[] = KBUILD_MODNAME; static char ohci_driver_name[] = KBUILD_MODNAME;
static inline void reg_write(const struct fw_ohci *ohci, int offset, u32 data) 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) ...@@ -224,6 +226,13 @@ static void ar_context_tasklet(unsigned long data)
struct fw_ohci *ohci = ctx->ohci; struct fw_ohci *ohci = ctx->ohci;
struct fw_packet p; struct fw_packet p;
u32 status, length, tcode; 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? */ /* FIXME: What to do about evt_* errors? */
length = le16_to_cpu(ctx->descriptor.req_count) - length = le16_to_cpu(ctx->descriptor.req_count) -
...@@ -287,12 +296,14 @@ static void ar_context_tasklet(unsigned long data) ...@@ -287,12 +296,14 @@ static void ar_context_tasklet(unsigned long data)
dma_sync_single_for_device(ohci->card.device, ctx->descriptor_bus, dma_sync_single_for_device(ohci->card.device, ctx->descriptor_bus,
sizeof ctx->descriptor_bus, DMA_TO_DEVICE); sizeof ctx->descriptor_bus, DMA_TO_DEVICE);
/* FIXME: We stop and restart the ar context here, what if we /* Make sure the active bit is 0 before we reprogram the DMA. */
* stop while a receive is in progress? Maybe we could just for (i = 0; i < MAX_STOP_CONTEXT_LOOPS; i++)
* loop the context back to itself and use it in buffer fill if (!(reg_read(ctx->ohci,
* mode as intended... */ 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); ar_context_run(ctx);
} }
......
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