From 2d14172900c05319a9242c92a5257db381072eb8 Mon Sep 17 00:00:00 2001
From: Floris Bos <bos@je-eigen-domein.nl>
Date: Wed, 6 Mar 2013 22:39:32 +0100
Subject: [PATCH] bcm2708_fb: add pan support
Typically used for page-flipping
Signed-off-by: Floris Bos <bos@je-eigen-domein.nl>
---
drivers/video/bcm2708_fb.c | 41 +++++++++++++++++++++++++++++++++++++++--
1 file changed, 39 insertions(+), 2 deletions(-)
diff --git a/drivers/video/bcm2708_fb.c b/drivers/video/bcm2708_fb.c
index efdee9d..e50cf58 100644
--- a/drivers/video/bcm2708_fb.c
+++ b/drivers/video/bcm2708_fb.c
@@ -68,6 +68,23 @@ struct bcm2708_fb {
#define to_bcm2708(info) container_of(info, struct bcm2708_fb, fb)
+/* structs for mailbox property interface */
+
+struct vc_msg_tag_pan {
+ uint32_t tag_id; /* the message id */
+ uint32_t buffer_size; /* size of the buffer (8 bytes) */
+ uint32_t data_size; /* size of data (8 bytes) */
+ uint32_t xoffset;
+ uint32_t yoffset;
+};
+
+struct vc_msg_pan {
+ uint32_t msg_size; /* sizeof(struct vc_msg_pan) */
+ uint32_t request_code;
+ struct vc_msg_tag_pan tag; /* the tag structure above to make */
+ uint32_t end_tag; /* an end identifier (NULL) */
+};
+
static int bcm2708_fb_set_bitfields(struct fb_var_screeninfo *var)
{
int ret = 0;
@@ -326,6 +343,25 @@ static void bcm2708_fb_imageblit(struct fb_info *info,
cfb_imageblit(info, image);
}
+static int bcm2708_fb_pan_display(struct fb_var_screeninfo *var,
+ struct fb_info *info)
+{
+ int ret;
+ struct vc_msg_pan msg = {0};
+
+ msg.msg_size = sizeof(msg);
+ msg.tag.tag_id = VCMSG_SET_VIRTUAL_OFFSET;
+ msg.tag.buffer_size = 8;
+ msg.tag.data_size = 8;
+ msg.tag.xoffset = var->xoffset;
+ msg.tag.yoffset = var->yoffset;
+ ret = bcm_mailbox_property(&msg, sizeof(msg));
+
+ return (ret == 0
+ && msg.tag.xoffset == var->xoffset
+ && msg.tag.yoffset == var->yoffset) ? 0 : -EINVAL;
+}
+
static struct fb_ops bcm2708_fb_ops = {
.owner = THIS_MODULE,
.fb_check_var = bcm2708_fb_check_var,
@@ -335,6 +371,7 @@ static struct fb_ops bcm2708_fb_ops = {
.fb_fillrect = bcm2708_fb_fillrect,
.fb_copyarea = bcm2708_fb_copyarea,
.fb_imageblit = bcm2708_fb_imageblit,
+ .fb_pan_display = bcm2708_fb_pan_display
};
static int fbwidth = 800; /* module parameter */
@@ -365,8 +402,8 @@ static int bcm2708_fb_register(struct bcm2708_fb *fb)
strncpy(fb->fb.fix.id, bcm2708_name, sizeof(fb->fb.fix.id));
fb->fb.fix.type = FB_TYPE_PACKED_PIXELS;
fb->fb.fix.type_aux = 0;
- fb->fb.fix.xpanstep = 0;
- fb->fb.fix.ypanstep = 0;
+ fb->fb.fix.xpanstep = 1;
+ fb->fb.fix.ypanstep = 1;
fb->fb.fix.ywrapstep = 0;
fb->fb.fix.accel = FB_ACCEL_NONE;
--
1.7.10.4