media: ddbridge: make DMA buffer count and size modparam-configurable
Make the number of DMA buffers and their size configurable using module parameters. Being able to set these to a higher number might help on busy systems when handling overall high data rates without having to edit the driver sources and recompile things. Picked up from the upstream dddvb-0.9.33 release. Signed-off-by: Daniel Scheller <d.scheller@gmx.net> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
parent
60586360f1
commit
0a68fc44d8
|
@ -96,6 +96,15 @@ static int stv0910_single;
|
|||
module_param(stv0910_single, int, 0444);
|
||||
MODULE_PARM_DESC(stv0910_single, "use stv0910 cards as single demods");
|
||||
|
||||
static int dma_buf_num = 8;
|
||||
module_param(dma_buf_num, int, 0444);
|
||||
MODULE_PARM_DESC(dma_buf_num, "Number of DMA buffers, possible values: 8-32");
|
||||
|
||||
static int dma_buf_size = 21;
|
||||
module_param(dma_buf_size, int, 0444);
|
||||
MODULE_PARM_DESC(dma_buf_size,
|
||||
"DMA buffer size as multiple of 128*47, possible values: 1-43");
|
||||
|
||||
/****************************************************************************/
|
||||
|
||||
static DEFINE_MUTEX(redirect_lock);
|
||||
|
@ -2172,16 +2181,16 @@ static void ddb_dma_init(struct ddb_io *io, int nr, int out)
|
|||
INIT_WORK(&dma->work, output_work);
|
||||
dma->regs = rm->odma->base + rm->odma->size * nr;
|
||||
dma->bufregs = rm->odma_buf->base + rm->odma_buf->size * nr;
|
||||
dma->num = OUTPUT_DMA_BUFS;
|
||||
dma->size = OUTPUT_DMA_SIZE;
|
||||
dma->div = OUTPUT_DMA_IRQ_DIV;
|
||||
dma->num = dma_buf_num;
|
||||
dma->size = dma_buf_size * 128 * 47;
|
||||
dma->div = 1;
|
||||
} else {
|
||||
INIT_WORK(&dma->work, input_work);
|
||||
dma->regs = rm->idma->base + rm->idma->size * nr;
|
||||
dma->bufregs = rm->idma_buf->base + rm->idma_buf->size * nr;
|
||||
dma->num = INPUT_DMA_BUFS;
|
||||
dma->size = INPUT_DMA_SIZE;
|
||||
dma->div = INPUT_DMA_IRQ_DIV;
|
||||
dma->num = dma_buf_num;
|
||||
dma->size = dma_buf_size * 128 * 47;
|
||||
dma->div = 1;
|
||||
}
|
||||
ddbwritel(io->port->dev, 0, DMA_BUFFER_ACK(dma));
|
||||
dev_dbg(io->port->dev->dev, "init link %u, io %u, dma %u, dmaregs %08x bufregs %08x\n",
|
||||
|
@ -3338,6 +3347,15 @@ int ddb_exit_ddbridge(int stage, int error)
|
|||
|
||||
int ddb_init_ddbridge(void)
|
||||
{
|
||||
if (dma_buf_num < 8)
|
||||
dma_buf_num = 8;
|
||||
if (dma_buf_num > 32)
|
||||
dma_buf_num = 32;
|
||||
if (dma_buf_size < 1)
|
||||
dma_buf_size = 1;
|
||||
if (dma_buf_size > 43)
|
||||
dma_buf_size = 43;
|
||||
|
||||
if (ddb_class_create() < 0)
|
||||
return -1;
|
||||
ddb_wq = alloc_workqueue("ddbridge", 0, 0);
|
||||
|
|
|
@ -136,20 +136,8 @@ struct ddb_info {
|
|||
const struct ddb_regmap *regmap;
|
||||
};
|
||||
|
||||
/* DMA_SIZE MUST be smaller than 256k and
|
||||
* MUST be divisible by 188 and 128 !!!
|
||||
*/
|
||||
|
||||
#define DMA_MAX_BUFS 32 /* hardware table limit */
|
||||
|
||||
#define INPUT_DMA_BUFS 8
|
||||
#define INPUT_DMA_SIZE (128 * 47 * 21)
|
||||
#define INPUT_DMA_IRQ_DIV 1
|
||||
|
||||
#define OUTPUT_DMA_BUFS 8
|
||||
#define OUTPUT_DMA_SIZE (128 * 47 * 21)
|
||||
#define OUTPUT_DMA_IRQ_DIV 1
|
||||
|
||||
struct ddb;
|
||||
struct ddb_port;
|
||||
|
||||
|
|
Loading…
Reference in a new issue