diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0560-drm-vc4-crtc-Enable-and-disable-the-PV-in-atomic_ena.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0560-drm-vc4-crtc-Enable-and-disable-the-PV-in-atomic_ena.patch | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0560-drm-vc4-crtc-Enable-and-disable-the-PV-in-atomic_ena.patch b/target/linux/bcm27xx/patches-5.4/950-0560-drm-vc4-crtc-Enable-and-disable-the-PV-in-atomic_ena.patch new file mode 100644 index 0000000000..c5f06f20ea --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0560-drm-vc4-crtc-Enable-and-disable-the-PV-in-atomic_ena.patch @@ -0,0 +1,55 @@ +From 7bbbfef1c98e832cbd55e66ac2d7f13ec0a2b11e Mon Sep 17 00:00:00 2001 +From: Maxime Ripard <maxime@cerno.tech> +Date: Fri, 21 Feb 2020 14:34:31 +0100 +Subject: [PATCH] drm/vc4: crtc: Enable and disable the PV in + atomic_enable / disable + +The VIDEN bit in the pixelvalve currently being used to enable or disable +the pixelvalve seems to not be enough in some situations, which whill end +up with the pixelvalve stalling. + +In such a case, even re-enabling VIDEN doesn't bring it back and we need to +clear the FIFO. This can only be done if the pixelvalve is disabled though. + +In order to overcome this, we can configure the pixelvalve during +mode_set_no_fb, but only enable it in atomic_enable and flush the FIFO +there, and in atomic_disable disable the pixelvalve again. + +Signed-off-by: Maxime Ripard <maxime@cerno.tech> +--- + drivers/gpu/drm/vc4/vc4_crtc.c | 10 +++++++--- + 1 file changed, 7 insertions(+), 3 deletions(-) + +--- a/drivers/gpu/drm/vc4/vc4_crtc.c ++++ b/drivers/gpu/drm/vc4/vc4_crtc.c +@@ -374,9 +374,7 @@ static void vc4_crtc_config_pv(struct dr + PV_CONTROL_TRIGGER_UNDERFLOW | + PV_CONTROL_WAIT_HSTART | + VC4_SET_FIELD(vc4_encoder->clock_select, +- PV_CONTROL_CLK_SELECT) | +- PV_CONTROL_FIFO_CLR | +- PV_CONTROL_EN); ++ PV_CONTROL_CLK_SELECT)); + } + + static void vc4_crtc_mode_set_nofb(struct drm_crtc *crtc) +@@ -467,6 +465,8 @@ static void vc4_crtc_atomic_disable(stru + ret = wait_for(!(CRTC_READ(PV_V_CONTROL) & PV_VCONTROL_VIDEN), 1); + WARN_ONCE(ret, "Timeout waiting for !PV_VCONTROL_VIDEN\n"); + ++ CRTC_WRITE(PV_CONTROL, CRTC_READ(PV_CONTROL) & ~PV_CONTROL_EN); ++ + if (HVS_READ(SCALER_DISPCTRLX(chan)) & + SCALER_DISPCTRLX_ENABLE) { + HVS_WRITE(SCALER_DISPCTRLX(chan), +@@ -554,6 +554,10 @@ static void vc4_crtc_atomic_enable(struc + + require_hvs_enabled(dev); + ++ /* Reset the PV fifo. */ ++ CRTC_WRITE(PV_CONTROL, CRTC_READ(PV_CONTROL) | ++ PV_CONTROL_FIFO_CLR | PV_CONTROL_EN); ++ + /* Enable vblank irq handling before crtc is started otherwise + * drm_crtc_get_vblank() fails in vc4_crtc_update_dlist(). + */ |