From d17a1bb9b801f7046af29c31b946a9619bfe382d Mon Sep 17 00:00:00 2001 From: Eric Anholt Date: Wed, 14 Dec 2016 11:46:14 -0800 Subject: [PATCH] drm/vc4: Set up SCALER_DISPCTRL at boot. We want the HVS on, obviously, and we also want DSP3 (PV1's source) to be muxed from HVS channel 2 like we expect in vc4_crtc.c. The firmware wasn't setting the DSP3 mux up when both the LCD and HDMI were disabled. Signed-off-by: Eric Anholt Acked-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/20161214194621.16499-5-eric@anholt.net --- drivers/gpu/drm/vc4/vc4_hvs.c | 14 ++++++++++++++ drivers/gpu/drm/vc4/vc4_regs.h | 3 +++ 2 files changed, 17 insertions(+) diff --git a/drivers/gpu/drm/vc4/vc4_hvs.c b/drivers/gpu/drm/vc4/vc4_hvs.c index 6fbab1c..fc68b1b 100644 --- a/drivers/gpu/drm/vc4/vc4_hvs.c +++ b/drivers/gpu/drm/vc4/vc4_hvs.c @@ -170,6 +170,7 @@ static int vc4_hvs_bind(struct device *dev, struct device *master, void *data) struct vc4_dev *vc4 = drm->dev_private; struct vc4_hvs *hvs = NULL; int ret; + u32 dispctrl; hvs = devm_kzalloc(&pdev->dev, sizeof(*hvs), GFP_KERNEL); if (!hvs) @@ -211,6 +212,19 @@ static int vc4_hvs_bind(struct device *dev, struct device *master, void *data) return ret; vc4->hvs = hvs; + + dispctrl = HVS_READ(SCALER_DISPCTRL); + + dispctrl |= SCALER_DISPCTRL_ENABLE; + + /* Set DSP3 (PV1) to use HVS channel 2, which would otherwise + * be unused. + */ + dispctrl &= ~SCALER_DISPCTRL_DSP3_MUX_MASK; + dispctrl |= VC4_SET_FIELD(2, SCALER_DISPCTRL_DSP3_MUX); + + HVS_WRITE(SCALER_DISPCTRL, dispctrl); + return 0; } diff --git a/drivers/gpu/drm/vc4/vc4_regs.h b/drivers/gpu/drm/vc4/vc4_regs.h index 39f6886..b3b297f 100644 --- a/drivers/gpu/drm/vc4/vc4_regs.h +++ b/drivers/gpu/drm/vc4/vc4_regs.h @@ -244,6 +244,9 @@ # define SCALER_DISPCTRL_ENABLE BIT(31) # define SCALER_DISPCTRL_DSP2EISLUR BIT(15) # define SCALER_DISPCTRL_DSP1EISLUR BIT(14) +# define SCALER_DISPCTRL_DSP3_MUX_MASK VC4_MASK(19, 18) +# define SCALER_DISPCTRL_DSP3_MUX_SHIFT 18 + /* Enables Display 0 short line and underrun contribution to * SCALER_DISPSTAT_IRQDISP0. Note that short frame contributions are * always enabled. -- 2.7.4