From: Asheesh Bhardwaj <asheeshb@xxxxxx>
The user can specify the size of the buffers with an offset from the kernel
images.
---
drivers/media/video/davinci/vpif_capture.c | 56 +++++++++++++++++++++++++++-
drivers/media/video/davinci/vpif_capture.h | 2 +
2 files changed, 57 insertions(+), 1 deletions(-)
diff --git a/drivers/media/video/davinci/vpif_capture.c b/drivers/media/video/davinci/vpif_capture.c
index b4b5905..9ba015d 100644
--- a/drivers/media/video/davinci/vpif_capture.c
+++ b/drivers/media/video/davinci/vpif_capture.c
@@ -53,18 +53,24 @@ static u32 ch0_numbuffers = 3;
static u32 ch1_numbuffers = 3;
static u32 ch0_bufsize = 1920 * 1080 * 2;
static u32 ch1_bufsize = 720 * 576 * 2;
+static u32 cont_bufoffset = 0;
+static u32 cont_bufsize = 0;
module_param(debug, int, 0644);
module_param(ch0_numbuffers, uint, S_IRUGO);
module_param(ch1_numbuffers, uint, S_IRUGO);
module_param(ch0_bufsize, uint, S_IRUGO);
module_param(ch1_bufsize, uint, S_IRUGO);
+module_param(cont_bufoffset, uint, S_IRUGO);
+module_param(cont_bufsize, uint, S_IRUGO);
MODULE_PARM_DESC(debug, "Debug level 0-1");
MODULE_PARM_DESC(ch2_numbuffers, "Channel0 buffer count (default:3)");
MODULE_PARM_DESC(ch3_numbuffers, "Channel1 buffer count (default:3)");
MODULE_PARM_DESC(ch2_bufsize, "Channel0 buffer size (default:1920 x 1080 x 2)");
MODULE_PARM_DESC(ch3_bufsize, "Channel1 buffer size (default:720 x 576 x 2)");
+MODULE_PARM_DESC(cont_bufoffset,"Capture buffer offset(default 0)");
+MODULE_PARM_DESC(cont_bufsize,"Capture buffer size(default 0)");
static struct vpif_config_params config_params = {
.min_numbuffers = 3,
@@ -187,10 +193,27 @@ static int vpif_buffer_setup(struct videobuf_queue *q, unsigned int *count,
/* Calculate the size of the buffer */
*size = config_params.channel_bufsize[ch->channel_id];
+
+ /*Checking if the buffer size exceeds the available buffer*/
+ /*ycmux_mode = 0 means 1 channel mode HD and ycmuxmode = 1 means 2 channels mode SD */
+ if (ch->vpifparams.std_info.ycmux_mode == 0) {
+ if (config_params.video_limit[ch->channel_id]) {
+ while (*size * *count > (config_params.video_limit[0]
+ + config_params.video_limit[1]))
+ (*count)--;
+ }
+ }
+ else {
+ if (config_params.video_limit[ch->channel_id]) {
+ while (*size * *count > config_params.video_limit[ch->channel_id])
+ (*count)--;
+ }
+ }
if (*count < config_params.min_numbuffers)
*count = config_params.min_numbuffers;
- return 0;
+
+ return 0;
}
/**
@@ -1892,6 +1915,8 @@ static __init int vpif_probe(struct platform_device *pdev)
struct video_device *vfd;
struct resource *res;
int subdev_count;
+ unsigned long phys_end_kernel;
+ size_t size;
vpif_dev = &pdev->dev;
@@ -1941,6 +1966,35 @@ static __init int vpif_probe(struct platform_device *pdev)
/* Set video_dev to the video device */
ch->video_dev = vfd;
}
+
+ /* Initialising the memory from the bootargs for contiguous memory buffers and avoid defragmentation */
+ if(cont_bufsize) {
+ /* attempt to determine the end of Linux kernel memory */
+ phys_end_kernel = virt_to_phys((void *)PAGE_OFFSET) +
+ (num_physpages << PAGE_SHIFT);
+ size = cont_bufsize;
+ phys_end_kernel += cont_bufoffset;
+ err = dma_declare_coherent_memory(&pdev->dev, phys_end_kernel,
+ phys_end_kernel,
+ size,
+ DMA_MEMORY_MAP |
+ DMA_MEMORY_EXCLUSIVE);
+ if (!err) {
+ dev_err(&pdev->dev, "Unable to declare MMAP memory.\n");
+ err = -ENOMEM;
+ goto probe_out;
+ }
+
+ /*The resources are divided into two equal memory and when we have HD output we can add them together*/
+ for (j = 0; j < VPIF_CAPTURE_MAX_DEVICES; j++) {
+ ch = vpif_obj.dev[j];
+ ch->channel_id = j;
+ config_params.video_limit[ch->channel_id] = 0; /* only enabled if second resource exists */
+ if(cont_bufsize) {
+ config_params.video_limit[ch->channel_id] = size/2;
+ }
+ }
+ }
for (j = 0; j < VPIF_CAPTURE_MAX_DEVICES; j++) {
ch = vpif_obj.dev[j];
diff --git a/drivers/media/video/davinci/vpif_capture.h b/drivers/media/video/davinci/vpif_capture.h
index 4e12ec8..b526887 100644
--- a/drivers/media/video/davinci/vpif_capture.h
+++ b/drivers/media/video/davinci/vpif_capture.h
@@ -155,6 +155,8 @@ struct vpif_config_params {
u32 channel_bufsize[VPIF_CAPTURE_NUM_CHANNELS];
u8 default_device[VPIF_CAPTURE_NUM_CHANNELS];
u8 max_device_type;
+ /* Used for limiting the video buffers when we allocate memory*/
+ u32 video_limit[VPIF_CAPTURE_NUM_CHANNELS];
};
/* Struct which keeps track of the line numbers for the sliced vbi service */
struct vpif_service_line {
--
1.6.3.3
--
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