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    Subject[PATCH 17/81] drm/radeon: fix backend map setup on 1 RB sumo boards
    Date
    3.5.7.6 -stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Alex Deucher <alexander.deucher@amd.com>

    commit f7eb97300832f4fe5fe916c5d84cd2e25169330e upstream.

    Need to adjust the backend map depending on which
    RB is enabled.

    Fixes:
    https://bugzilla.redhat.com/show_bug.cgi?id=892233

    Reported-by: Mikko Tiihonen <mikko.tiihonen@iki.fi>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    [ herton: adjust context ]
    Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
    ---
    drivers/gpu/drm/radeon/evergreen.c | 17 ++++++++++++++---
    1 file changed, 14 insertions(+), 3 deletions(-)

    diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
    index c490d16..4170e1e 100644
    --- a/drivers/gpu/drm/radeon/evergreen.c
    +++ b/drivers/gpu/drm/radeon/evergreen.c
    @@ -1861,9 +1861,20 @@ static void evergreen_gpu_init(struct radeon_device *rdev)
    WREG32(DMIF_ADDR_CONFIG, gb_addr_config);
    WREG32(HDP_ADDR_CONFIG, gb_addr_config);

    - tmp = gb_addr_config & NUM_PIPES_MASK;
    - tmp = r6xx_remap_render_backend(rdev, tmp, rdev->config.evergreen.max_backends,
    - EVERGREEN_MAX_BACKENDS, disabled_rb_mask);
    + if ((rdev->config.evergreen.max_backends == 1) &&
    + (rdev->flags & RADEON_IS_IGP)) {
    + if ((disabled_rb_mask & 3) == 1) {
    + /* RB0 disabled, RB1 enabled */
    + tmp = 0x11111111;
    + } else {
    + /* RB1 disabled, RB0 enabled */
    + tmp = 0x00000000;
    + }
    + } else {
    + tmp = gb_addr_config & NUM_PIPES_MASK;
    + tmp = r6xx_remap_render_backend(rdev, tmp, rdev->config.evergreen.max_backends,
    + EVERGREEN_MAX_BACKENDS, disabled_rb_mask);
    + }
    WREG32(GB_BACKEND_MAP, tmp);

    WREG32(CGTS_SYS_TCC_DISABLE, 0);
    --
    1.7.9.5


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