Commit f4813f444a for qemu.org

commit f4813f444abf77ba8dd0a2c57f42fbc122a760f7
Author: BALATON Zoltan <balaton@eik.bme.hu>
Date:   Fri Apr 3 16:59:28 2026 +0200

    ati-vga: Update mode on CRTC_PITCH change

    When changing line length we need to update display parameters so call
    mode change when changing CRTC_PITCH if the value has changed.

    Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
    Reviewed-by: Chad Jablonski <chad@jablonski.xyz>
    Message-ID: <3f54ff54a873a8f8a0cc5f14660703b4025a69e2.1775228029.git.balaton@eik.bme.hu>
    Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

diff --git a/hw/display/ati.c b/hw/display/ati.c
index a283afbfff..7bb57c44d9 100644
--- a/hw/display/ati.c
+++ b/hw/display/ati.c
@@ -743,7 +743,11 @@ static void ati_mm_write(void *opaque, hwaddr addr,
         s->regs.crtc_offset_cntl = data; /* FIXME */
         break;
     case CRTC_PITCH:
-        s->regs.crtc_pitch = data & 0x07ff07ff;
+        data &= 0x07ff07ff;
+        if (s->regs.crtc_pitch != data) {
+            s->regs.crtc_pitch = data;
+            ati_vga_switch_mode(s);
+        }
         break;
     case 0xf00 ... 0xfff:
         /* read-only copy of PCI config space so ignore writes */