[MIPS] Fix VGA corruption on RM300C

... by setting DRAM config to 2MB (SNI always used that size). This also
fixes video dram size detection in cirrusfb.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 32 insertions, 1 deletions

diff --git a/arch/mips/sni/setup.c b/arch/mips/sni/setup.c
index 68d7cf609b4f..4fedfbda0c79 100644
--- a/arch/mips/sni/setup.c
+++ b/arch/mips/sni/setup.c
@@ -6,7 +6,7 @@
  * for more details.
  *
  * Copyright (C) 1996, 97, 98, 2000, 03, 04, 06 Ralf Baechle (ralf@linux-mips.org)
- * Copyright (C) 2006 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
+ * Copyright (C) 2006,2007 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
  */
 #include <linux/eisa.h>
 #include <linux/init.h>
@@ -92,3 +92,34 @@ void __init plat_mem_setup(void)
 
         sni_display_setup();
 }
+
+#if CONFIG_PCI
+
+#include <linux/pci.h>
+#include <video/vga.h>
+#include <video/cirrus.h>
+
+static void __devinit quirk_cirrus_ram_size(struct pci_dev *dev)
+{
+        u16 cmd;
+
+        /*
+         * firmware doesn't set the ram size correct, so we
+         * need to do it here, otherwise we get screen corruption
+         * on older Cirrus chips
+         */
+        pci_read_config_word (dev, PCI_COMMAND, &cmd);
+        if ((cmd & (PCI_COMMAND_IO|PCI_COMMAND_MEMORY))
+                == (PCI_COMMAND_IO|PCI_COMMAND_MEMORY)) {
+                vga_wseq (NULL, CL_SEQR6, 0x12);        /* unlock all extension registers */
+                vga_wseq (NULL, CL_SEQRF, 0x18);
+        }
+}
+
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_CIRRUS, PCI_DEVICE_ID_CIRRUS_5434_8,
+                        quirk_cirrus_ram_size);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_CIRRUS, PCI_DEVICE_ID_CIRRUS_5436,
+                        quirk_cirrus_ram_size);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_CIRRUS, PCI_DEVICE_ID_CIRRUS_5446,
+                        quirk_cirrus_ram_size);
+#endif