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

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 <redacted>
---
 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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On Fri, 8 Aug 2008 14:47:05 +0200
Stanislaw Gruszka [off-list ref] wrote:

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 <redacted>
---

Acked-by: Krzysztof Helt <redacted>

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