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Message-ID: <CAPY8ntCSEH58GDzT4=N_eExpJCfsdaEpNFZ0aq=xessBhFfiZg@mail.gmail.com>
Date: Tue, 28 Jul 2020 11:31:49 +0100
From: Dave Stevenson <dave.stevenson@...pberrypi.com>
To: Maxime Ripard <maxime@...no.tech>
Cc: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
Eric Anholt <eric@...olt.net>,
DRI Development <dri-devel@...ts.freedesktop.org>,
linux-rpi-kernel@...ts.infradead.org,
bcm-kernel-feedback-list@...adcom.com,
linux-arm-kernel@...ts.infradead.org,
LKML <linux-kernel@...r.kernel.org>,
Tim Gover <tim.gover@...pberrypi.com>,
Phil Elwell <phil@...pberrypi.com>
Subject: Re: [PATCH v4 22/78] drm/vc4: crtc: Move HVS init and close to a function
Hi Maxime
On Wed, 8 Jul 2020 at 18:43, Maxime Ripard <maxime@...no.tech> wrote:
>
> In order to make further refactoring easier, let's move the HVS channel
> setup / teardown to their own function.
>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>
Reviewed-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
> ---
> drivers/gpu/drm/vc4/vc4_hvs.c | 104 +++++++++++++++++++----------------
> 1 file changed, 58 insertions(+), 46 deletions(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_hvs.c b/drivers/gpu/drm/vc4/vc4_hvs.c
> index 50f9a9674a7e..78bb1c0b0b76 100644
> --- a/drivers/gpu/drm/vc4/vc4_hvs.c
> +++ b/drivers/gpu/drm/vc4/vc4_hvs.c
> @@ -196,6 +196,62 @@ static void vc4_hvs_update_gamma_lut(struct drm_crtc *crtc)
> vc4_hvs_lut_load(crtc);
> }
>
> +static int vc4_hvs_init_channel(struct vc4_dev *vc4, struct drm_crtc *crtc,
> + struct drm_display_mode *mode, bool oneshot)
> +{
> + struct vc4_crtc_state *vc4_crtc_state = to_vc4_crtc_state(crtc->state);
> + unsigned int chan = vc4_crtc_state->assigned_channel;
> + u32 dispctrl;
> +
> + /* Turn on the scaler, which will wait for vstart to start
> + * compositing.
> + * When feeding the transposer, we should operate in oneshot
> + * mode.
> + */
> + dispctrl = SCALER_DISPCTRLX_ENABLE;
> +
> + if (!vc4->hvs->hvs5)
> + dispctrl |= VC4_SET_FIELD(mode->hdisplay,
> + SCALER_DISPCTRLX_WIDTH) |
> + VC4_SET_FIELD(mode->vdisplay,
> + SCALER_DISPCTRLX_HEIGHT) |
> + (oneshot ? SCALER_DISPCTRLX_ONESHOT : 0);
> + else
> + dispctrl |= VC4_SET_FIELD(mode->hdisplay,
> + SCALER5_DISPCTRLX_WIDTH) |
> + VC4_SET_FIELD(mode->vdisplay,
> + SCALER5_DISPCTRLX_HEIGHT) |
> + (oneshot ? SCALER5_DISPCTRLX_ONESHOT : 0);
> +
> + HVS_WRITE(SCALER_DISPCTRLX(chan), dispctrl);
> +
> + return 0;
> +}
> +
> +static void vc4_hvs_stop_channel(struct drm_device *dev, unsigned int chan)
> +{
> + struct vc4_dev *vc4 = to_vc4_dev(dev);
> +
> + if (HVS_READ(SCALER_DISPCTRLX(chan)) & SCALER_DISPCTRLX_ENABLE)
> + return;
> +
> + HVS_WRITE(SCALER_DISPCTRLX(chan),
> + HVS_READ(SCALER_DISPCTRLX(chan)) | SCALER_DISPCTRLX_RESET);
> + HVS_WRITE(SCALER_DISPCTRLX(chan),
> + HVS_READ(SCALER_DISPCTRLX(chan)) & ~SCALER_DISPCTRLX_ENABLE);
> +
> + /* Once we leave, the scaler should be disabled and its fifo empty. */
> + WARN_ON_ONCE(HVS_READ(SCALER_DISPCTRLX(chan)) & SCALER_DISPCTRLX_RESET);
> +
> + WARN_ON_ONCE(VC4_GET_FIELD(HVS_READ(SCALER_DISPSTATX(chan)),
> + SCALER_DISPSTATX_MODE) !=
> + SCALER_DISPSTATX_MODE_DISABLED);
> +
> + WARN_ON_ONCE((HVS_READ(SCALER_DISPSTATX(chan)) &
> + (SCALER_DISPSTATX_FULL | SCALER_DISPSTATX_EMPTY)) !=
> + SCALER_DISPSTATX_EMPTY);
> +}
> +
> int vc4_hvs_atomic_check(struct drm_crtc *crtc,
> struct drm_crtc_state *state)
> {
> @@ -268,63 +324,19 @@ void vc4_hvs_atomic_enable(struct drm_crtc *crtc,
> struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc->state);
> struct drm_display_mode *mode = &crtc->state->adjusted_mode;
> bool oneshot = vc4_state->feed_txp;
> - u32 dispctrl;
>
> vc4_hvs_update_dlist(crtc);
> -
> - /* Turn on the scaler, which will wait for vstart to start
> - * compositing.
> - * When feeding the transposer, we should operate in oneshot
> - * mode.
> - */
> - dispctrl = SCALER_DISPCTRLX_ENABLE;
> -
> - if (!vc4->hvs->hvs5)
> - dispctrl |= VC4_SET_FIELD(mode->hdisplay,
> - SCALER_DISPCTRLX_WIDTH) |
> - VC4_SET_FIELD(mode->vdisplay,
> - SCALER_DISPCTRLX_HEIGHT) |
> - (oneshot ? SCALER_DISPCTRLX_ONESHOT : 0);
> - else
> - dispctrl |= VC4_SET_FIELD(mode->hdisplay,
> - SCALER5_DISPCTRLX_WIDTH) |
> - VC4_SET_FIELD(mode->vdisplay,
> - SCALER5_DISPCTRLX_HEIGHT) |
> - (oneshot ? SCALER5_DISPCTRLX_ONESHOT : 0);
> -
> - HVS_WRITE(SCALER_DISPCTRLX(vc4_state->assigned_channel), dispctrl);
> + vc4_hvs_init_channel(vc4, crtc, mode, oneshot);
> }
>
> void vc4_hvs_atomic_disable(struct drm_crtc *crtc,
> struct drm_crtc_state *old_state)
> {
> struct drm_device *dev = crtc->dev;
> - struct vc4_dev *vc4 = to_vc4_dev(dev);
> struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(old_state);
> unsigned int chan = vc4_state->assigned_channel;
>
> - if (HVS_READ(SCALER_DISPCTRLX(chan)) &
> - SCALER_DISPCTRLX_ENABLE) {
> - HVS_WRITE(SCALER_DISPCTRLX(chan),
> - SCALER_DISPCTRLX_RESET);
> -
> - /* While the docs say that reset is self-clearing, it
> - * seems it doesn't actually.
> - */
> - HVS_WRITE(SCALER_DISPCTRLX(chan), 0);
> - }
> -
> - /* Once we leave, the scaler should be disabled and its fifo empty. */
> -
> - WARN_ON_ONCE(HVS_READ(SCALER_DISPCTRLX(chan)) & SCALER_DISPCTRLX_RESET);
> -
> - WARN_ON_ONCE(VC4_GET_FIELD(HVS_READ(SCALER_DISPSTATX(chan)),
> - SCALER_DISPSTATX_MODE) !=
> - SCALER_DISPSTATX_MODE_DISABLED);
> -
> - WARN_ON_ONCE((HVS_READ(SCALER_DISPSTATX(chan)) &
> - (SCALER_DISPSTATX_FULL | SCALER_DISPSTATX_EMPTY)) !=
> - SCALER_DISPSTATX_EMPTY);
> + vc4_hvs_stop_channel(dev, chan);
> }
>
> void vc4_hvs_atomic_flush(struct drm_crtc *crtc,
> --
> git-series 0.9.1
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