atmel_lcdfb: don't initialize a pre-allocated framebuffer

If the user specified a fixed framebuffer address on the command line, it may
have been initialized already with a splash image or something, so we
shouldn't clear it.

Therefore, we should only initialize the framebuffer if we allocated it
ourselves.  This patch also updates the AVR32 setup code to clear the
framebuffer if it allocated it itself, i.e.  the user didn't provide a fixed
address or the reservation failed.

I've updated the at91 platform code as well so that it initializes the
framebuffer if it is located in SRAM, but I haven't tested that it actually
works.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Nicolas FERRE <nicolas.ferre@rfo.atmel.com>
Cc: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 25 insertions, 0 deletions

diff --git a/arch/arm/mach-at91/at91sam9261_devices.c b/arch/arm/mach-at91/at91sam9261_devices.c
index 37cd547855b..728bb8f3944 100644
--- a/arch/arm/mach-at91/at91sam9261_devices.c
+++ b/arch/arm/mach-at91/at91sam9261_devices.c
@@ -539,6 +539,17 @@ void __init at91_add_device_lcdc(struct atmel_lcdfb_info *data)
         at91_set_B_periph(AT91_PIN_PB28, 0);    /* LCDD23 */
 #endif
 
+        if (ARRAY_SIZE(lcdc_resources) > 2) {
+                void __iomem *fb;
+                struct resource *fb_res = &lcdc_resources[2];
+                size_t fb_len = fb_res->end - fb_res->start + 1;
+
+                fb = ioremap_writecombine(fb_res->start, fb_len);
+                if (fb) {
+                        memset(fb, 0, fb_len);
+                        iounmap(fb, fb_len);
+                }
+        }
         lcdc_data = *data;
         platform_device_register(&at91_lcdc_device);
 }
diff --git a/arch/arm/mach-at91/at91sam9rl_devices.c b/arch/arm/mach-at91/at91sam9rl_devices.c
index dbb9a5fc209..054689804e7 100644
--- a/arch/arm/mach-at91/at91sam9rl_devices.c
+++ b/arch/arm/mach-at91/at91sam9rl_devices.c
@@ -381,6 +381,20 @@ void __init at91_add_device_lcdc(struct atmel_lcdfb_info *data)
         at91_set_B_periph(AT91_PIN_PC24, 0);    /* LCDD22 */
         at91_set_B_periph(AT91_PIN_PC25, 0);    /* LCDD23 */
 
+#ifdef CONFIG_FB_INTSRAM
+        {
+                void __iomem *fb;
+                struct resource *fb_res = &lcdc_resources[2];
+                size_t fb_len = fb_res->end - fb_res->start + 1;
+
+                fb = ioremap_writecombine(fb_res->start, fb_len);
+                if (fb) {
+                        memset(fb, 0, fb_len);
+                        iounmap(fb, fb_len);
+                }
+        }
+#endif
+
         lcdc_data = *data;
         platform_device_register(&at91_lcdc_device);
 }