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Subject[PATCH 07/20] video: msm: Allow users to request a larger x and y virtual fb
Date
As long as the total size fits inside the memory allocated to the framebuffer
users can request a larger size. This change allows users to request a triple
buffered fb.

Authors:
Dima Zavin <dima@android.com>
Rebecca Schultz Zavin <rebecca@android.com>
Colin Cross <ccross@android.com>

Signed-off-by: Carl Vanderlip <carlv@codeaurora.org>
---
drivers/video/msm/msm_fb.c | 63 ++++++++++++++++++++++++++++++++++---------
1 files changed, 50 insertions(+), 13 deletions(-)

diff --git a/drivers/video/msm/msm_fb.c b/drivers/video/msm/msm_fb.c
index 04d0067..6af8b41 100644
--- a/drivers/video/msm/msm_fb.c
+++ b/drivers/video/msm/msm_fb.c
@@ -53,6 +53,9 @@ do { \
printk(KERN_INFO "msmfb: "fmt, ##args); \
} while (0)

+#define BITS_PER_PIXEL(info) (info->fb->var.bits_per_pixel)
+#define BYTES_PER_PIXEL(info) (info->fb->var.bits_per_pixel >> 3)
+
static int msmfb_debug_mask;
module_param_named(msmfb_debug_mask, msmfb_debug_mask, int,
S_IRUGO | S_IWUSR | S_IWGRP);
@@ -161,9 +164,10 @@ static int msmfb_start_dma(struct msmfb_info *msmfb)
}
spin_unlock_irqrestore(&msmfb->update_lock, irq_flags);

- addr = ((msmfb->xres * (yoffset + y) + x) * 2);
+ addr = ((msmfb->xres * (yoffset + y) + x) * BYTES_PER_PIXEL(msmfb));
mdp->dma(mdp, addr + msmfb->fb->fix.smem_start,
- msmfb->xres * 2, w, h, x, y, &msmfb->dma_callback,
+ msmfb->xres * BYTES_PER_PIXEL(msmfb), w, h, x, y,
+ &msmfb->dma_callback,
panel->interface_type);
return 0;
error:
@@ -323,14 +327,46 @@ error:

static int msmfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
+ u32 size;
+
if ((var->xres != info->var.xres) ||
(var->yres != info->var.yres) ||
- (var->xres_virtual != info->var.xres_virtual) ||
- (var->yres_virtual != info->var.yres_virtual) ||
(var->xoffset != info->var.xoffset) ||
(var->bits_per_pixel != info->var.bits_per_pixel) ||
(var->grayscale != info->var.grayscale))
return -EINVAL;
+
+ size = var->xres_virtual * var->yres_virtual *
+ (var->bits_per_pixel >> 3);
+ if (size > info->fix.smem_len)
+ return -EINVAL;
+ return 0;
+}
+
+static int msmfb_set_par(struct fb_info *info)
+{
+ struct fb_var_screeninfo *var = &info->var;
+ struct fb_fix_screeninfo *fix = &info->fix;
+
+ /* we only support RGB ordering for now */
+ if (var->bits_per_pixel == 32 || var->bits_per_pixel == 24) {
+ var->red.offset = 0;
+ var->red.length = 8;
+ var->green.offset = 8;
+ var->green.length = 8;
+ var->blue.offset = 16;
+ var->blue.length = 8;
+ } else if (var->bits_per_pixel == 16) {
+ var->red.offset = 11;
+ var->red.length = 5;
+ var->green.offset = 5;
+ var->green.length = 6;
+ var->blue.offset = 0;
+ var->blue.length = 5;
+ } else
+ return -1;
+ fix->line_length = var->xres * var->bits_per_pixel / 8;
+
return 0;
}

@@ -427,6 +463,7 @@ static struct fb_ops msmfb_ops = {
.fb_open = msmfb_open,
.fb_release = msmfb_release,
.fb_check_var = msmfb_check_var,
+ .fb_set_par = msmfb_set_par,
.fb_pan_display = msmfb_pan_display,
.fb_fillrect = msmfb_fillrect,
.fb_copyarea = msmfb_copyarea,
@@ -438,8 +475,6 @@ static unsigned PP[16];



-#define BITS_PER_PIXEL 16
-
static void setup_fb_info(struct msmfb_info *msmfb)
{
struct fb_info *fb_info = msmfb->fb;
@@ -462,7 +497,7 @@ static void setup_fb_info(struct msmfb_info *msmfb)
fb_info->var.height = msmfb->panel->fb_data->height;
fb_info->var.xres_virtual = msmfb->xres;
fb_info->var.yres_virtual = msmfb->yres * 2;
- fb_info->var.bits_per_pixel = BITS_PER_PIXEL;
+ fb_info->var.bits_per_pixel = 16;
fb_info->var.accel_flags = 0;

fb_info->var.yoffset = 0;
@@ -497,28 +532,30 @@ static int setup_fbmem(struct msmfb_info *msmfb, struct platform_device *pdev)
struct fb_info *fb = msmfb->fb;
struct resource *resource;
unsigned long size = msmfb->xres * msmfb->yres *
- (BITS_PER_PIXEL >> 3) * 2;
+ BYTES_PER_PIXEL(msmfb) * 2;
+ unsigned long resource_size;
unsigned char *fbram;

/* board file might have attached a resource describing an fb */
resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!resource)
return -EINVAL;
+ resource_size = resource->end - resource->start + 1;

/* check the resource is large enough to fit the fb */
- if (resource->end - resource->start < size) {
- printk(KERN_ERR "allocated resource is too small for "
+ if (resource_size < size) {
+ printk(KERN_ERR "msmfb: allocated resource is too small for "
"fb\n");
return -ENOMEM;
}
fb->fix.smem_start = resource->start;
- fb->fix.smem_len = resource->end - resource->start;
- fbram = ioremap(resource->start,
- resource->end - resource->start);
+ fb->fix.smem_len = resource_size;
+ fbram = ioremap(resource->start, resource_size);
if (fbram == 0) {
printk(KERN_ERR "msmfb: cannot allocate fbram!\n");
return -ENOMEM;
}
+
fb->screen_base = fbram;
return 0;
}
--
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.


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