From 62bc808af174dfc9365ae54cbaf6c21f662ea4c3 Mon Sep 17 00:00:00 2001 From: Dom Cobley Date: Wed, 4 Oct 2023 16:02:39 +0100 Subject: [PATCH 0655/1085] vc4/drm: Remove the clear of SCALER_DISPBKGND_FILL Since "drm/vc4: hvs: Support BCM2712 HVS" booting Pi4 with dual 4kp30 displays connected fails with: vc4-drm gpu: [drm] *ERROR* [CRTC:107:pixelvalve-4] flip_done timed out It has been tracked down to the referenced commit adding a path to clear the SCALER_DISPBKGND_FILL when not required. Dual 4kp30 works with a core clock of 297MHz when background fill is enabled, but requires a higher value with it disabled. 320MHz still fails, while 330MHz seems okay. Lets always enable background fill for Pi0-4. Fixes: e84da235223d ("drm/vc4: hvs: Support BCM2712 HVS") Signed-off-by: Dom Cobley --- drivers/gpu/drm/vc4/vc4_hvs.c | 20 +++++++++----------- 1 file changed, 9 insertions(+), 11 deletions(-) --- a/drivers/gpu/drm/vc4/vc4_hvs.c +++ b/drivers/gpu/drm/vc4/vc4_hvs.c @@ -1304,27 +1304,25 @@ void vc4_hvs_atomic_flush(struct drm_crt WARN_ON(!vc4_state->mm); WARN_ON_ONCE(dlist_next - dlist_start != vc4_state->mm->mm_node.size); - if (enable_bg_fill) { + if (vc4->gen >= VC4_GEN_6) { /* This sets a black background color fill, as is the case * with other DRM drivers. */ - if (vc4->gen >= VC4_GEN_6) + if (enable_bg_fill) HVS_WRITE(SCALER6_DISPX_CTRL1(channel), HVS_READ(SCALER6_DISPX_CTRL1(channel)) | SCALER6_DISPX_CTRL1_BGENB); else - HVS_WRITE(SCALER_DISPBKGNDX(channel), - HVS_READ(SCALER_DISPBKGNDX(channel)) | - SCALER_DISPBKGND_FILL); - } else { - if (vc4->gen >= VC4_GEN_6) HVS_WRITE(SCALER6_DISPX_CTRL1(channel), HVS_READ(SCALER6_DISPX_CTRL1(channel)) & ~SCALER6_DISPX_CTRL1_BGENB); - else - HVS_WRITE(SCALER_DISPBKGNDX(channel), - HVS_READ(SCALER_DISPBKGNDX(channel)) & - ~SCALER_DISPBKGND_FILL); + } else { + /* we can actually run with a lower core clock when background + * fill is enabled on VC4_GEN_5 so leave it enabled always. + */ + HVS_WRITE(SCALER_DISPBKGNDX(channel), + HVS_READ(SCALER_DISPBKGNDX(channel)) | + SCALER_DISPBKGND_FILL); } /* Only update DISPLIST if the CRTC was already running and is not