[PATCH 2/2] atmel_lcdfb: Add board parameter specify framebuffer memory size

[Stanislaw Gruszka <stf_xl@wp.pl>]

Specify how much physically continuous, DMA capable memory will be allocated
at driver initialization time. This allow to create framebuffer device with
larger virtual resolution. Combine with y-panning this can be used to 
implement double buffering acceleration method.

Signed-off-by: Stanislaw Gruszka <stf_xl@wp.pl>
Acked-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
---
 drivers/video/atmel_lcdfb.c |    7 +++++--
 include/video/atmel_lcdc.h  |    1 +
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/video/atmel_lcdfb.c b/drivers/video/atmel_lcdfb.c
index e1acfa7..a471a60 100644
--- a/drivers/video/atmel_lcdfb.c
+++ b/drivers/video/atmel_lcdfb.c
@@ -242,9 +242,11 @@ static int atmel_lcdfb_alloc_video_memory(struct 
atmel_lcdfb_info *sinfo)
 {
 	struct fb_info *info = sinfo->info;
 	struct fb_var_screeninfo *var = &info->var;
+	unsigned int smem_len;
 
-	info->fix.smem_len = (var->xres_virtual * var->yres_virtual
-			    * ((var->bits_per_pixel + 7) / 8));
+	smem_len = (var->xres_virtual * var->yres_virtual
+		    * ((var->bits_per_pixel + 7) / 8));
+	info->fix.smem_len = max(smem_len, sinfo->smem_len);
 
 	info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len,
 					(dma_addr_t *)&info->fix.smem_start, GFP_KERNEL);
@@ -796,6 +798,7 @@ static int __init atmel_lcdfb_probe(struct platform_device 
*pdev)
 		sinfo->default_monspecs = pdata_sinfo->default_monspecs;
 		sinfo->atmel_lcdfb_power_control = pdata_sinfo->atmel_lcdfb_power_control;
 		sinfo->guard_time = pdata_sinfo->guard_time;
+		sinfo->smem_len = pdata_sinfo->smem_len;
 		sinfo->lcdcon_is_backlight = pdata_sinfo->lcdcon_is_backlight;
 		sinfo->lcd_wiring_mode = pdata_sinfo->lcd_wiring_mode;
 	} else {
diff --git a/include/video/atmel_lcdc.h b/include/video/atmel_lcdc.h
index 613173b..920c4e9 100644
--- a/include/video/atmel_lcdc.h
+++ b/include/video/atmel_lcdc.h
@@ -41,6 +41,7 @@ struct atmel_lcdfb_info {
 	struct work_struct	task;
 
 	unsigned int		guard_time;
+	unsigned int 		smem_len;
 	struct platform_device	*pdev;
 	struct clk		*bus_clk;
 	struct clk		*lcdc_clk;
-- 
1.5.2.5

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