drm/radeon/kms: fix LVDS setup on r4xx

R4xx mobility chips use atombios, which does not store
the LVDS_GEN_CNTL parameter setup like combios.  Rather,
it's configured in LVDSEncoderControl.  As such,
LVDS_GEN_CNTL is set wrong when on resume.  Call
LVDSEncoderControl to set it properly.

Should fix fdo bug 25336

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

1 files changed, 9 insertions, 3 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_legacy_encoders.c b/drivers/gpu/drm/radeon/radeon_legacy_encoders.c
index 36ac47672a3..df00515e81f 100644
--- a/drivers/gpu/drm/radeon/radeon_legacy_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_legacy_encoders.c
@@ -136,7 +136,14 @@ static void radeon_legacy_lvds_mode_set(struct drm_encoder *encoder,
         lvds_pll_cntl &= ~RADEON_LVDS_PLL_EN;
 
         lvds_ss_gen_cntl = RREG32(RADEON_LVDS_SS_GEN_CNTL);
-        if ((!rdev->is_atom_bios)) {
+        if (rdev->is_atom_bios) {
+                /* LVDS_GEN_CNTL parameters are computed in LVDSEncoderControl
+                 * need to call that on resume to set up the reg properly.
+                 */
+                radeon_encoder->pixel_clock = adjusted_mode->clock;
+                atombios_digital_setup(encoder, PANEL_ENCODER_ACTION_ENABLE);
+                lvds_gen_cntl = RREG32(RADEON_LVDS_GEN_CNTL);
+        } else {
                 struct radeon_encoder_lvds *lvds = (struct radeon_encoder_lvds *)radeon_encoder->enc_priv;
                 if (lvds) {
                         DRM_DEBUG("bios LVDS_GEN_CNTL: 0x%x\n", lvds->lvds_gen_cntl);
@@ -147,8 +154,7 @@ static void radeon_legacy_lvds_mode_set(struct drm_encoder *encoder,
                                              (lvds->panel_blon_delay << RADEON_LVDS_PWRSEQ_DELAY2_SHIFT));
                 } else
                         lvds_gen_cntl = RREG32(RADEON_LVDS_GEN_CNTL);
-        } else
-                lvds_gen_cntl = RREG32(RADEON_LVDS_GEN_CNTL);
+        }
         lvds_gen_cntl |= RADEON_LVDS_DISPLAY_DIS;
         lvds_gen_cntl &= ~(RADEON_LVDS_ON |
                            RADEON_LVDS_BLON |