drm/radeon/kms: hopefully fix pll issues for real (v3)

The problematic boards have a recommended reference divider
to be used when spread spectrum is enabled on the laptop panel.
Enable the use of the recommended reference divider along with
the new pll algo.

v2: testing options

v3: When using the fixed reference divider with LVDS, prefer
min m to max p and use fractional feedback dividers.

Fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=28852
https://bugzilla.kernel.org/show_bug.cgi?id=24462
https://bugzilla.kernel.org/show_bug.cgi?id=26552
MacbookPro issues reported by Justin Mattock <justinmattock@gmail.com>

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 0b10b0e149455736af753ccf27b244d97f3e6632..095bc507fb16842303b1f8b194c232ef124ed90d 100644 (file)
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -538,7 +538,6 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
                        pll->flags |= RADEON_PLL_PREFER_HIGH_FB_DIV;
                else
                        pll->flags |= RADEON_PLL_PREFER_LOW_REF_DIV;
-
        }
 
        list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
@@ -555,29 +554,28 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
                                        dp_clock = dig_connector->dp_clock;
                                }
                        }
-/* this might work properly with the new pll algo */
-#if 0 /* doesn't work properly on some laptops */
+
                        /* 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_USE_REF_DIV;
                                                pll->reference_div = ss->refdiv;
+                                               if (ASIC_IS_AVIVO(rdev))
+                                                       pll->flags |= RADEON_PLL_USE_FRAC_FB_DIV;
                                        }
                                }
                        }
-#endif
+
                        if (ASIC_IS_AVIVO(rdev)) {
                                /* DVO wants 2x pixel clock if the DVO chip is in 12 bit mode */
                                if (radeon_encoder->encoder_id == ENCODER_OBJECT_ID_INTERNAL_KLDSCP_DVO1)
                                        adjusted_clock = mode->clock * 2;
                                if (radeon_encoder->active_device & (ATOM_DEVICE_TV_SUPPORT))
                                        pll->flags |= RADEON_PLL_PREFER_CLOSEST_LOWER;
-                               /* rv515 needs more testing with this option */
-                               if (rdev->family != CHIP_RV515) {
-                                       if (radeon_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT))
-                                               pll->flags |= RADEON_PLL_IS_LCD;
-                               }
+                               if (radeon_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT))
+                                       pll->flags |= RADEON_PLL_IS_LCD;
                        } else {
                                if (encoder->encoder_type != DRM_MODE_ENCODER_DAC)
                                        pll->flags |= RADEON_PLL_NO_ODD_POST_DIV;
@@ -957,11 +955,7 @@ static void atombios_crtc_set_pll(struct drm_crtc *crtc, struct drm_display_mode
        /* adjust pixel clock as needed */
        adjusted_clock = atombios_adjust_pll(crtc, mode, pll, ss_enabled, &ss);
 
-       /* rv515 seems happier with the old algo */
-       if (rdev->family == CHIP_RV515)
-               radeon_compute_pll_legacy(pll, adjusted_clock, &pll_clock, &fb_div, &frac_fb_div,
-                                         &ref_div, &post_div);
-       else if (ASIC_IS_AVIVO(rdev))
+       if (ASIC_IS_AVIVO(rdev))
                radeon_compute_pll_avivo(pll, adjusted_clock, &pll_clock, &fb_div, &frac_fb_div,
                                         &ref_div, &post_div);
        else