Added code to support FBIOPAN_DISPLAY. Also added yres_virtual
parameter to device tree to set the virtual y resolution
Reviewed-by: Ray Jui <rjui@xxxxxxxxxxxx>
Reviewed-by: Scott Branden <sbranden@xxxxxxxxxxxx>
Signed-off-by: Arun Ramamurthy <arun.ramamurthy@xxxxxxxxxxxx>
---
.../devicetree/bindings/video/arm,pl11x.txt | 4 +++
drivers/video/fbdev/amba-clcd.c | 31 +++++++++++++++++++---
2 files changed, 31 insertions(+), 4 deletions(-)
diff --git a/Documentation/devicetree/bindings/video/arm,pl11x.txt b/Documentation/devicetree/bindings/video/arm,pl11x.txt
index 14d6f87..2262cdb 100644
--- a/Documentation/devicetree/bindings/video/arm,pl11x.txt
+++ b/Documentation/devicetree/bindings/video/arm,pl11x.txt
@@ -50,6 +50,10 @@ Optional properties:
display mode, data is driven onto the LCD data lines at the
programmed edge of CLCP when CLAC is in its active state.
+- yres_virtual: Virtual Y resolution,
+ It can be used to configure a virtual y resolution. It
+ must be a value larger than the actual y resolution.
+
Required sub-nodes:
- port: describes LCD panel signals, following the common binding
diff --git a/drivers/video/fbdev/amba-clcd.c b/drivers/video/fbdev/amba-clcd.c
index 4e4e50f..3bc09ad 100644
--- a/drivers/video/fbdev/amba-clcd.c
+++ b/drivers/video/fbdev/amba-clcd.c
@@ -454,6 +454,18 @@ static int clcdfb_mmap(struct fb_info *info,
return ret;
}
+static int clcdfb_pan_display(struct fb_var_screeninfo *var,
+ struct fb_info *info)
+{
+ struct clcd_fb *fb;
+
+ info->var = *var;
+ fb = to_clcd(info);
+ clcdfb_set_start(fb);
+
+ return 0;
+}
+
static struct fb_ops clcdfb_ops = {
.owner = THIS_MODULE,
.fb_check_var = clcdfb_check_var,
@@ -464,6 +476,7 @@ static struct fb_ops clcdfb_ops = {
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
.fb_mmap = clcdfb_mmap,
+ .fb_pan_display = clcdfb_pan_display,
};
static int clcdfb_register(struct clcd_fb *fb)
@@ -517,14 +530,16 @@ static int clcdfb_register(struct clcd_fb *fb)
fb->fb.fix.type = FB_TYPE_PACKED_PIXELS;
fb->fb.fix.type_aux = 0;
fb->fb.fix.xpanstep = 0;
- fb->fb.fix.ypanstep = 0;
+ if (fb->fb.var.yres_virtual > fb->panel->mode.yres)
+ fb->fb.fix.ypanstep = 1;
+ else
+ fb->fb.fix.ypanstep = 0;
fb->fb.fix.ywrapstep = 0;
fb->fb.fix.accel = FB_ACCEL_NONE;
fb->fb.var.xres = fb->panel->mode.xres;
fb->fb.var.yres = fb->panel->mode.yres;
fb->fb.var.xres_virtual = fb->panel->mode.xres;
- fb->fb.var.yres_virtual = fb->panel->mode.yres;
fb->fb.var.bits_per_pixel = fb->panel->bpp;
fb->fb.var.grayscale = fb->panel->grayscale;
fb->fb.var.pixclock = fb->panel->mode.pixclock;
@@ -690,7 +705,7 @@ static int clcdfb_of_init_display(struct clcd_fb *fb)
struct device_node *endpoint;
int err;
unsigned int bpp;
- u32 max_bandwidth;
+ u32 max_bandwidth, yres_virtual;
u32 tft_r0b0g0[3];
fb->panel = devm_kzalloc(&fb->dev->dev, sizeof(*fb->panel), GFP_KERNEL);
@@ -730,6 +745,14 @@ static int clcdfb_of_init_display(struct clcd_fb *fb)
fb->panel->width = -1;
fb->panel->height = -1;
+ /* if yres_virtual property is not specified in device tree,
+ * set it as the actual y resolution */
+ if (of_property_read_u32(fb->dev->dev.of_node,
+ "yres_virtual", &yres_virtual))
+ fb->fb.var.yres_virtual = fb->panel->mode.yres;
+ else
+ fb->fb.var.yres_virtual = yres_virtual;
+
if (of_property_read_u32_array(endpoint,
"arm,pl11x,tft-r0g0b0-pads",
tft_r0b0g0, ARRAY_SIZE(tft_r0b0g0)) == 0)
@@ -797,7 +820,7 @@ static int clcdfb_of_dma_setup(struct clcd_fb *fb)
if (err)
return err;
- framesize = fb->panel->mode.xres * fb->panel->mode.yres *
+ framesize = fb->panel->mode.xres * fb->fb.var.yres_virtual *
fb->panel->bpp / 8;
fb->fb.screen_base = dma_alloc_coherent(&fb->dev->dev, framesize,
&dma, GFP_KERNEL);
--
2.3.0
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