viafb: split viafb_set_start_addr up

Move individual start address setting to viafb_set_primary_address and
viafb_set_secondary_address and make it more flexible to reuse it for
panning.  Using central functions makes it easier to follow HW
manipulations.

Remove crt locking as it should be only needed for timing manipulation.
Move iga_path manipulation to via_pci_probe.

Remove memset for screen cleaning as it is currently done only for the
second screen.  This is not needed for normal operation but has a little
chance of causing unwanted display artifacts.  This can be fixed later
more consistent and more efficient (using viafb_fillrect) if needed.

This is a code clenup, no notable runtime changes expected.

Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Cc: Scott Fang <ScottFang@viatech.com.cn>
Cc: Joseph Chan <JosephChan@via.com.tw>
Cc: Harald Welte <laforge@gnumonks.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 17 insertions, 63 deletions

diff --git a/drivers/video/via/hw.c b/drivers/video/via/hw.c
index 64a820c6d494..5be4a670596f 100644
--- a/drivers/video/via/hw.c
+++ b/drivers/video/via/hw.c
@@ -629,70 +629,23 @@ void viafb_set_iga_path(void)
         }
 }
 
-void viafb_set_start_addr(void)
+void viafb_set_primary_address(u32 addr)
 {
-        unsigned long offset = 0, tmp = 0, size = 0;
-        unsigned long length;
-
-        DEBUG_MSG(KERN_INFO "viafb_set_start_addr!\n");
-        viafb_unlock_crt();
-        /* update starting address of IGA1 */
-        viafb_write_reg(CR0C, VIACR, 0x00);     /*initial starting address */
-        viafb_write_reg(CR0D, VIACR, 0x00);
-        viafb_write_reg(CR34, VIACR, 0x00);
-        viafb_write_reg_mask(CR48, VIACR, 0x00, 0x1F);
-
-        if (viafb_dual_fb) {
-                viaparinfo->iga_path = IGA1;
-                viaparinfo1->iga_path = IGA2;
-        }
-
-        if (viafb_SAMM_ON == 1) {
-                if (!viafb_dual_fb) {
-                        if (viafb_second_size)
-                                size = viafb_second_size * 1024 * 1024;
-                        else
-                                size = 8 * 1024 * 1024;
-                } else {
-
-                        size = viaparinfo1->memsize;
-                }
-                offset = viafb_second_offset;
-                DEBUG_MSG(KERN_INFO
-                          "viafb_second_size=%lx, second start_adddress=%lx\n",
-                          size, offset);
-        }
-        if (viafb_SAMM_ON == 1) {
-                offset = offset >> 3;
-
-                tmp = viafb_read_reg(VIACR, 0x62) & 0x01;
-                tmp |= (offset & 0x7F) << 1;
-                viafb_write_reg(CR62, VIACR, tmp);
-                viafb_write_reg(CR63, VIACR, ((offset & 0x7F80) >> 7));
-                viafb_write_reg(CR64, VIACR, ((offset & 0x7F8000) >> 15));
-                viafb_write_reg(CRA3, VIACR, ((offset & 0x3800000) >> 23));
-        } else {
-                /* update starting address */
-                viafb_write_reg(CR62, VIACR, 0x00);
-                viafb_write_reg(CR63, VIACR, 0x00);
-                viafb_write_reg(CR64, VIACR, 0x00);
-                viafb_write_reg(CRA3, VIACR, 0x00);
-        }
-
-        if (viafb_SAMM_ON == 1) {
-                if (viafb_accel) {
-                        if (!viafb_dual_fb)
-                                length = size - viaparinfo->fbmem_used;
-                        else
-                                length = size - viaparinfo1->fbmem_used;
-                } else
-                        length = size;
-                offset = (unsigned long)(void *)viafb_FB_MM +
-                        viafb_second_offset;
-                memset((void *)offset, 0, length);
-        }
+        DEBUG_MSG(KERN_DEBUG "viafb_set_primary_address(0x%08X)\n", addr);
+        viafb_write_reg(CR0D, VIACR, addr & 0xFF);
+        viafb_write_reg(CR0C, VIACR, (addr >> 8) & 0xFF);
+        viafb_write_reg(CR34, VIACR, (addr >> 16) & 0xFF);
+        viafb_write_reg_mask(CR48, VIACR, (addr >> 24) & 0x1F, 0x1F);
+}
 
-        viafb_lock_crt();
+void viafb_set_secondary_address(u32 addr)
+{
+        DEBUG_MSG(KERN_DEBUG "viafb_set_secondary_address(0x%08X)\n", addr);
+        /* secondary display supports only quadword aligned memory */
+        viafb_write_reg_mask(CR62, VIACR, (addr >> 2) & 0xFE, 0xFE);
+        viafb_write_reg(CR63, VIACR, (addr >> 10) & 0xFF);
+        viafb_write_reg(CR64, VIACR, (addr >> 18) & 0xFF);
+        viafb_write_reg_mask(CRA3, VIACR, (addr >> 26) & 0x07, 0x07);
 }
 
 void viafb_set_output_path(int device, int set_iga, int output_interface)
@@ -2288,7 +2241,8 @@ int viafb_setmode(int vmode_index, int hor_res, int ver_res, int video_bpp,
                 outb(VPIT.SR[i - 1], VIASR + 1);
         }
 
-        viafb_set_start_addr();
+        viafb_set_primary_address(0);
+        viafb_set_secondary_address(viafb_SAMM_ON ? viafb_second_offset : 0);
         viafb_set_iga_path();
 
         /* Write CRTC */