drm/radeon/kms: add missing frac fb div flag for dce4+

The fixed ref/post dividers are set by the AdjustPll table
rather than the ss info table on dce4+.  Make sure we enable
the fractional feedback dividers when using a fixed post
or ref divider on them as well.

Fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=29272

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

diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index 095bc50..a4e5e53 100644 (file)
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -557,9 +557,9 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
 
                        /* use recommended ref_div for ss */
                        if (radeon_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT)) {
-                               pll->flags |= RADEON_PLL_PREFER_MINM_OVER_MAXP;
                                if (ss_enabled) {
                                        if (ss->refdiv) {
+                                               pll->flags |= RADEON_PLL_PREFER_MINM_OVER_MAXP;
                                                pll->flags |= RADEON_PLL_USE_REF_DIV;
                                                pll->reference_div = ss->refdiv;
                                                if (ASIC_IS_AVIVO(rdev))
@@ -662,10 +662,12 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
                                                   index, (uint32_t *)&args);
                                adjusted_clock = le32_to_cpu(args.v3.sOutput.ulDispPllFreq) * 10;
                                if (args.v3.sOutput.ucRefDiv) {
+                                       pll->flags |= RADEON_PLL_USE_FRAC_FB_DIV;
                                        pll->flags |= RADEON_PLL_USE_REF_DIV;
                                        pll->reference_div = args.v3.sOutput.ucRefDiv;
                                }
                                if (args.v3.sOutput.ucPostDiv) {
+                                       pll->flags |= RADEON_PLL_USE_FRAC_FB_DIV;
                                        pll->flags |= RADEON_PLL_USE_POST_DIV;
                                        pll->post_div = args.v3.sOutput.ucPostDiv;
                                }