drm/radeon/kms: add disabled vbios accessor for NI asics

Some systems disable the vbios on secondary cards or cards that
have been posted.  This code re-enabled the vbios so the driver
can load it.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_bios.c b/drivers/gpu/drm/radeon/radeon_bios.c
index 8f2c7b50dcf5..1aba85cad1a8 100644
--- a/drivers/gpu/drm/radeon/radeon_bios.c
+++ b/drivers/gpu/drm/radeon/radeon_bios.c
@@ -131,6 +131,45 @@ static bool radeon_atrm_get_bios(struct radeon_device *rdev)
         return true;
 }
 
+static bool ni_read_disabled_bios(struct radeon_device *rdev)
+{
+        u32 bus_cntl;
+        u32 d1vga_control;
+        u32 d2vga_control;
+        u32 vga_render_control;
+        u32 rom_cntl;
+        bool r;
+
+        bus_cntl = RREG32(R600_BUS_CNTL);
+        d1vga_control = RREG32(AVIVO_D1VGA_CONTROL);
+        d2vga_control = RREG32(AVIVO_D2VGA_CONTROL);
+        vga_render_control = RREG32(AVIVO_VGA_RENDER_CONTROL);
+        rom_cntl = RREG32(R600_ROM_CNTL);
+
+        /* enable the rom */
+        WREG32(R600_BUS_CNTL, (bus_cntl & ~R600_BIOS_ROM_DIS));
+        /* Disable VGA mode */
+        WREG32(AVIVO_D1VGA_CONTROL,
+               (d1vga_control & ~(AVIVO_DVGA_CONTROL_MODE_ENABLE |
+                AVIVO_DVGA_CONTROL_TIMING_SELECT)));
+        WREG32(AVIVO_D2VGA_CONTROL,
+               (d2vga_control & ~(AVIVO_DVGA_CONTROL_MODE_ENABLE |
+                AVIVO_DVGA_CONTROL_TIMING_SELECT)));
+        WREG32(AVIVO_VGA_RENDER_CONTROL,
+               (vga_render_control & ~AVIVO_VGA_VSTATUS_CNTL_MASK));
+        WREG32(R600_ROM_CNTL, rom_cntl | R600_SCK_OVERWRITE);
+
+        r = radeon_read_bios(rdev);
+
+        /* restore regs */
+        WREG32(R600_BUS_CNTL, bus_cntl);
+        WREG32(AVIVO_D1VGA_CONTROL, d1vga_control);
+        WREG32(AVIVO_D2VGA_CONTROL, d2vga_control);
+        WREG32(AVIVO_VGA_RENDER_CONTROL, vga_render_control);
+        WREG32(R600_ROM_CNTL, rom_cntl);
+        return r;
+}
+
 static bool r700_read_disabled_bios(struct radeon_device *rdev)
 {
         uint32_t viph_control;
@@ -416,6 +455,8 @@ static bool radeon_read_disabled_bios(struct radeon_device *rdev)
 {
         if (rdev->flags & RADEON_IS_IGP)
                 return igp_read_bios_from_vram(rdev);
+        else if (rdev->family >= CHIP_BARTS)
+                return ni_read_disabled_bios(rdev);
         else if (rdev->family >= CHIP_RV770)
                 return r700_read_disabled_bios(rdev);
         else if (rdev->family >= CHIP_R600)