Hi Maxime
On Wed, 8 Jul 2020 at 18:42, Maxime Ripard <maxime@xxxxxxxxxx> wrote:
>
> The HVS found in the BCM2711 has 6 outputs and 3 FIFOs, with each output
> being connected to a pixelvalve, and some muxing between the FIFOs and
> outputs.
>
> Any output cannot feed from any FIFO though, and they all have a bunch of
> constraints.
>
> In order to support this, let's store the possible FIFOs each output can be
> assigned to in the vc4_crtc_data, and use that information at atomic_check
> time to iterate over all the CRTCs enabled and assign them FIFOs.
>
> The channel assigned is then set in the vc4_crtc_state so that the rest of
> the driver can use it.
>
> Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx>
Reviewed-by: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/vc4/vc4_crtc.c | 12 +-
> drivers/gpu/drm/vc4/vc4_drv.h | 7 +-
> drivers/gpu/drm/vc4/vc4_hvs.c | 28 ++----
> drivers/gpu/drm/vc4/vc4_kms.c | 167 +++++++++++++++++++++++++++++++++-
> drivers/gpu/drm/vc4/vc4_regs.h | 10 ++-
> drivers/gpu/drm/vc4/vc4_txp.c | 1 +-
> 6 files changed, 199 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
> index fe2e5675aed4..b7e47ce1476c 100644
> --- a/drivers/gpu/drm/vc4/vc4_crtc.c
> +++ b/drivers/gpu/drm/vc4/vc4_crtc.c
> @@ -88,6 +88,7 @@ static bool vc4_crtc_get_scanout_position(struct drm_crtc *crtc,
> struct drm_device *dev = crtc->dev;
> struct vc4_dev *vc4 = to_vc4_dev(dev);
> struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
> + struct vc4_crtc_state *vc4_crtc_state = to_vc4_crtc_state(crtc->state);
> unsigned int cob_size;
> u32 val;
> int fifo_lines;
> @@ -104,7 +105,7 @@ static bool vc4_crtc_get_scanout_position(struct drm_crtc *crtc,
> * Read vertical scanline which is currently composed for our
> * pixelvalve by the HVS, and also the scaler status.
> */
> - val = HVS_READ(SCALER_DISPSTATX(vc4_crtc->channel));
> + val = HVS_READ(SCALER_DISPSTATX(vc4_crtc_state->assigned_channel));
>
> /* Get optional system timestamp after query. */
> if (etime)
> @@ -124,7 +125,7 @@ static bool vc4_crtc_get_scanout_position(struct drm_crtc *crtc,
> *hpos += mode->crtc_htotal / 2;
> }
>
> - cob_size = vc4_crtc_get_cob_allocation(vc4, vc4_crtc->channel);
> + cob_size = vc4_crtc_get_cob_allocation(vc4, vc4_crtc_state->assigned_channel);
> /* This is the offset we need for translating hvs -> pv scanout pos. */
> fifo_lines = cob_size / mode->crtc_hdisplay;
>
> @@ -520,7 +521,7 @@ static void vc4_crtc_handle_page_flip(struct vc4_crtc *vc4_crtc)
> struct drm_device *dev = crtc->dev;
> struct vc4_dev *vc4 = to_vc4_dev(dev);
> struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc->state);
> - u32 chan = vc4_crtc->channel;
> + u32 chan = vc4_state->assigned_channel;
> unsigned long flags;
>
> spin_lock_irqsave(&dev->event_lock, flags);
> @@ -719,6 +720,7 @@ struct drm_crtc_state *vc4_crtc_duplicate_state(struct drm_crtc *crtc)
> old_vc4_state = to_vc4_crtc_state(crtc->state);
> vc4_state->feed_txp = old_vc4_state->feed_txp;
> vc4_state->margins = old_vc4_state->margins;
> + vc4_state->assigned_channel = old_vc4_state->assigned_channel;
>
> __drm_atomic_helper_crtc_duplicate_state(crtc, &vc4_state->base);
> return &vc4_state->base;
> @@ -779,6 +781,7 @@ static const struct drm_crtc_helper_funcs vc4_crtc_helper_funcs = {
>
> static const struct vc4_pv_data bcm2835_pv0_data = {
> .base = {
> + .hvs_available_channels = BIT(0),
> .hvs_output = 0,
> },
> .debugfs_name = "crtc0_regs",
> @@ -791,6 +794,7 @@ static const struct vc4_pv_data bcm2835_pv0_data = {
>
> static const struct vc4_pv_data bcm2835_pv1_data = {
> .base = {
> + .hvs_available_channels = BIT(2),
> .hvs_output = 2,
> },
> .debugfs_name = "crtc1_regs",
> @@ -803,6 +807,7 @@ static const struct vc4_pv_data bcm2835_pv1_data = {
>
> static const struct vc4_pv_data bcm2835_pv2_data = {
> .base = {
> + .hvs_available_channels = BIT(1),
> .hvs_output = 1,
> },
> .debugfs_name = "crtc2_regs",
> @@ -866,7 +871,6 @@ int vc4_crtc_init(struct drm_device *drm, struct vc4_crtc *vc4_crtc,
> drm_crtc_init_with_planes(drm, crtc, primary_plane, NULL,
> crtc_funcs, NULL);
> drm_crtc_helper_add(crtc, crtc_helper_funcs);
> - vc4_crtc->channel = vc4_crtc->data->hvs_output;
> drm_mode_crtc_set_gamma_size(crtc, ARRAY_SIZE(vc4_crtc->lut_r));
> drm_crtc_enable_color_mgmt(crtc, 0, false, crtc->gamma_size);
>
> diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
> index d1cf4c038180..9e81ad8331f1 100644
> --- a/drivers/gpu/drm/vc4/vc4_drv.h
> +++ b/drivers/gpu/drm/vc4/vc4_drv.h
> @@ -447,6 +447,9 @@ to_vc4_encoder(struct drm_encoder *encoder)
> }
>
> struct vc4_crtc_data {
> + /* Bitmask of channels (FIFOs) of the HVS that the output can source from */
> + unsigned int hvs_available_channels;
> +
> /* Which output of the HVS this pixelvalve sources from. */
> int hvs_output;
> };
> @@ -471,9 +474,6 @@ struct vc4_crtc {
> /* Timestamp at start of vblank irq - unaffected by lock delays. */
> ktime_t t_vblank;
>
> - /* Which HVS channel we're using for our CRTC. */
> - int channel;
> -
> u8 lut_r[256];
> u8 lut_g[256];
> u8 lut_b[256];
> @@ -509,6 +509,7 @@ struct vc4_crtc_state {
> struct drm_mm_node mm;
> bool feed_txp;
> bool txp_armed;
> + unsigned int assigned_channel;
>
> struct {
> unsigned int left;
> diff --git a/drivers/gpu/drm/vc4/vc4_hvs.c b/drivers/gpu/drm/vc4/vc4_hvs.c
> index 6fd9de1dc65a..50e88f634799 100644
> --- a/drivers/gpu/drm/vc4/vc4_hvs.c
> +++ b/drivers/gpu/drm/vc4/vc4_hvs.c
> @@ -161,6 +161,7 @@ static void vc4_hvs_lut_load(struct drm_crtc *crtc)
> struct drm_device *dev = crtc->dev;
> struct vc4_dev *vc4 = to_vc4_dev(dev);
> struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
> + struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc->state);
> u32 i;
>
> /* The LUT memory is laid out with each HVS channel in order,
> @@ -169,7 +170,7 @@ static void vc4_hvs_lut_load(struct drm_crtc *crtc)
> */
> HVS_WRITE(SCALER_GAMADDR,
> SCALER_GAMADDR_AUTOINC |
> - (vc4_crtc->channel * 3 * crtc->gamma_size));
> + (vc4_state->assigned_channel * 3 * crtc->gamma_size));
>
> for (i = 0; i < crtc->gamma_size; i++)
> HVS_WRITE(SCALER_GAMDATA, vc4_crtc->lut_r[i]);
> @@ -249,12 +250,12 @@ static void vc4_hvs_update_dlist(struct drm_crtc *crtc)
> crtc->state->event = NULL;
> }
>
> - HVS_WRITE(SCALER_DISPLISTX(vc4_crtc->channel),
> + HVS_WRITE(SCALER_DISPLISTX(vc4_state->assigned_channel),
> vc4_state->mm.start);
>
> spin_unlock_irqrestore(&dev->event_lock, flags);
> } else {
> - HVS_WRITE(SCALER_DISPLISTX(vc4_crtc->channel),
> + HVS_WRITE(SCALER_DISPLISTX(vc4_state->assigned_channel),
> vc4_state->mm.start);
> }
> }
> @@ -264,7 +265,6 @@ void vc4_hvs_atomic_enable(struct drm_crtc *crtc,
> {
> struct drm_device *dev = crtc->dev;
> struct vc4_dev *vc4 = to_vc4_dev(dev);
> - struct vc4_crtc *vc4_crtc = to_vc4_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;
> @@ -292,7 +292,7 @@ void vc4_hvs_atomic_enable(struct drm_crtc *crtc,
> SCALER5_DISPCTRLX_HEIGHT) |
> (oneshot ? SCALER5_DISPCTRLX_ONESHOT : 0);
>
> - HVS_WRITE(SCALER_DISPCTRLX(vc4_crtc->channel), dispctrl);
> + HVS_WRITE(SCALER_DISPCTRLX(vc4_state->assigned_channel), dispctrl);
> }
>
> void vc4_hvs_atomic_disable(struct drm_crtc *crtc,
> @@ -300,8 +300,8 @@ void vc4_hvs_atomic_disable(struct drm_crtc *crtc,
> {
> struct drm_device *dev = crtc->dev;
> struct vc4_dev *vc4 = to_vc4_dev(dev);
> - struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
> - u32 chan = vc4_crtc->channel;
> + 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) {
> @@ -332,7 +332,6 @@ void vc4_hvs_atomic_flush(struct drm_crtc *crtc,
> {
> struct drm_device *dev = crtc->dev;
> struct vc4_dev *vc4 = to_vc4_dev(dev);
> - struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
> struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc->state);
> struct drm_plane *plane;
> struct vc4_plane_state *vc4_plane_state;
> @@ -374,8 +373,8 @@ void vc4_hvs_atomic_flush(struct drm_crtc *crtc,
> /* This sets a black background color fill, as is the case
> * with other DRM drivers.
> */
> - HVS_WRITE(SCALER_DISPBKGNDX(vc4_crtc->channel),
> - HVS_READ(SCALER_DISPBKGNDX(vc4_crtc->channel)) |
> + HVS_WRITE(SCALER_DISPBKGNDX(vc4_state->assigned_channel),
> + HVS_READ(SCALER_DISPBKGNDX(vc4_state->assigned_channel)) |
> SCALER_DISPBKGND_FILL);
>
> /* Only update DISPLIST if the CRTC was already running and is not
> @@ -389,7 +388,7 @@ void vc4_hvs_atomic_flush(struct drm_crtc *crtc,
> vc4_hvs_update_dlist(crtc);
>
> if (crtc->state->color_mgmt_changed) {
> - u32 dispbkgndx = HVS_READ(SCALER_DISPBKGNDX(vc4_crtc->channel));
> + u32 dispbkgndx = HVS_READ(SCALER_DISPBKGNDX(vc4_state->assigned_channel));
>
> if (crtc->state->gamma_lut) {
> vc4_hvs_update_gamma_lut(crtc);
> @@ -401,7 +400,7 @@ void vc4_hvs_atomic_flush(struct drm_crtc *crtc,
> */
> dispbkgndx &= ~SCALER_DISPBKGND_GAMMA;
> }
> - HVS_WRITE(SCALER_DISPBKGNDX(vc4_crtc->channel), dispbkgndx);
> + HVS_WRITE(SCALER_DISPBKGNDX(vc4_state->assigned_channel), dispbkgndx);
> }
>
> if (debug_dump_regs) {
> @@ -414,12 +413,11 @@ void vc4_hvs_mode_set_nofb(struct drm_crtc *crtc)
> {
> struct drm_device *dev = crtc->dev;
> struct vc4_dev *vc4 = to_vc4_dev(dev);
> - struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
> struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc->state);
> struct drm_display_mode *mode = &crtc->state->adjusted_mode;
> bool interlace = mode->flags & DRM_MODE_FLAG_INTERLACE;
>
> - if (vc4_crtc->data->hvs_output == 2) {
> + if (vc4_state->assigned_channel == 2) {
> u32 dispctrl;
> u32 dsp3_mux;
>
> @@ -443,7 +441,7 @@ void vc4_hvs_mode_set_nofb(struct drm_crtc *crtc)
> HVS_WRITE(SCALER_DISPCTRL, dispctrl | dsp3_mux);
> }
>
> - HVS_WRITE(SCALER_DISPBKGNDX(vc4_crtc->channel),
> + HVS_WRITE(SCALER_DISPBKGNDX(vc4_state->assigned_channel),
> SCALER_DISPBKGND_AUTOHS |
> SCALER_DISPBKGND_GAMMA |
> (interlace ? SCALER_DISPBKGND_INTERLACE : 0));
> diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c
> index 717673b18132..7c8a87339959 100644
> --- a/drivers/gpu/drm/vc4/vc4_kms.c
> +++ b/drivers/gpu/drm/vc4/vc4_kms.c
> @@ -146,6 +146,107 @@ vc4_ctm_commit(struct vc4_dev *vc4, struct drm_atomic_state *state)
> VC4_SET_FIELD(ctm_state->fifo, SCALER_OLEDOFFS_DISPFIFO));
> }
>
> +static void vc4_hvs_pv_muxing_commit(struct vc4_dev *vc4,
> + struct drm_atomic_state *state)
> +{
> + struct drm_crtc_state *crtc_state;
> + struct drm_crtc *crtc;
> + unsigned int i;
> +
> + for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
> + struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc_state);
> + u32 dispctrl;
> + u32 dsp3_mux;
> +
> + if (!crtc_state->active)
> + continue;
> +
> + if (vc4_state->assigned_channel != 2)
> + continue;
> +
> + /*
> + * SCALER_DISPCTRL_DSP3 = X, where X < 2 means 'connect DSP3 to
> + * FIFO X'.
> + * SCALER_DISPCTRL_DSP3 = 3 means 'disable DSP 3'.
> + *
> + * DSP3 is connected to FIFO2 unless the transposer is
> + * enabled. In this case, FIFO 2 is directly accessed by the
> + * TXP IP, and we need to disable the FIFO2 -> pixelvalve1
> + * route.
> + */
> + if (vc4_state->feed_txp)
> + dsp3_mux = VC4_SET_FIELD(3, SCALER_DISPCTRL_DSP3_MUX);
> + else
> + dsp3_mux = VC4_SET_FIELD(2, SCALER_DISPCTRL_DSP3_MUX);
> +
> + dispctrl = HVS_READ(SCALER_DISPCTRL) &
> + ~SCALER_DISPCTRL_DSP3_MUX_MASK;
> + HVS_WRITE(SCALER_DISPCTRL, dispctrl | dsp3_mux);
> + }
> +}
> +
> +static void vc5_hvs_pv_muxing_commit(struct vc4_dev *vc4,
> + struct drm_atomic_state *state)
> +{
> + struct drm_crtc_state *crtc_state;
> + struct drm_crtc *crtc;
> + unsigned char dsp2_mux = 0;
> + unsigned char dsp3_mux = 3;
> + unsigned char dsp4_mux = 3;
> + unsigned char dsp5_mux = 3;
> + unsigned int i;
> + u32 reg;
> +
> + for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
> + struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc_state);
> + struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
> +
> + if (!crtc_state->active)
> + continue;
> +
> + switch (vc4_crtc->data->hvs_output) {
> + case 2:
> + dsp2_mux = (vc4_state->assigned_channel == 2) ? 0 : 1;
> + break;
> +
> + case 3:
> + dsp3_mux = vc4_state->assigned_channel;
> + break;
> +
> + case 4:
> + dsp4_mux = vc4_state->assigned_channel;
> + break;
> +
> + case 5:
> + dsp5_mux = vc4_state->assigned_channel;
> + break;
> +
> + default:
> + break;
> + }
> + }
> +
> + reg = HVS_READ(SCALER_DISPECTRL);
> + HVS_WRITE(SCALER_DISPECTRL,
> + (reg & ~SCALER_DISPECTRL_DSP2_MUX_MASK) |
> + VC4_SET_FIELD(dsp2_mux, SCALER_DISPECTRL_DSP2_MUX));
> +
> + reg = HVS_READ(SCALER_DISPCTRL);
> + HVS_WRITE(SCALER_DISPCTRL,
> + (reg & ~SCALER_DISPCTRL_DSP3_MUX_MASK) |
> + VC4_SET_FIELD(dsp3_mux, SCALER_DISPCTRL_DSP3_MUX));
> +
> + reg = HVS_READ(SCALER_DISPEOLN);
> + HVS_WRITE(SCALER_DISPEOLN,
> + (reg & ~SCALER_DISPEOLN_DSP4_MUX_MASK) |
> + VC4_SET_FIELD(dsp4_mux, SCALER_DISPEOLN_DSP4_MUX));
> +
> + reg = HVS_READ(SCALER_DISPDITHER);
> + HVS_WRITE(SCALER_DISPDITHER,
> + (reg & ~SCALER_DISPDITHER_DSP5_MUX_MASK) |
> + VC4_SET_FIELD(dsp5_mux, SCALER_DISPDITHER_DSP5_MUX));
> +}
> +
> static void
> vc4_atomic_complete_commit(struct drm_atomic_state *state)
> {
> @@ -157,9 +258,9 @@ vc4_atomic_complete_commit(struct drm_atomic_state *state)
> int i;
>
> for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
> - struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
> + struct vc4_crtc_state *vc4_crtc_state = to_vc4_crtc_state(new_crtc_state);
>
> - vc4_hvs_mask_underrun(dev, vc4_crtc->channel);
> + vc4_hvs_mask_underrun(dev, vc4_crtc_state->assigned_channel);
> }
>
> if (vc4->hvs->hvs5)
> @@ -173,6 +274,11 @@ vc4_atomic_complete_commit(struct drm_atomic_state *state)
>
> vc4_ctm_commit(vc4, state);
>
> + if (vc4->hvs->hvs5)
> + vc5_hvs_pv_muxing_commit(vc4, state);
> + else
> + vc4_hvs_pv_muxing_commit(vc4, state);
> +
> drm_atomic_helper_commit_planes(dev, state, 0);
>
> drm_atomic_helper_commit_modeset_enables(dev, state);
> @@ -382,8 +488,11 @@ vc4_ctm_atomic_check(struct drm_device *dev, struct drm_atomic_state *state)
>
> /* CTM is being enabled or the matrix changed. */
> if (new_crtc_state->ctm) {
> + struct vc4_crtc_state *vc4_crtc_state =
> + to_vc4_crtc_state(new_crtc_state);
> +
> /* fifo is 1-based since 0 disables CTM. */
> - int fifo = to_vc4_crtc(crtc)->channel + 1;
> + int fifo = vc4_crtc_state->assigned_channel + 1;
>
> /* Check userland isn't trying to turn on CTM for more
> * than one CRTC at a time.
> @@ -493,10 +602,60 @@ static const struct drm_private_state_funcs vc4_load_tracker_state_funcs = {
> .atomic_destroy_state = vc4_load_tracker_destroy_state,
> };
>
> +#define NUM_OUTPUTS 6
> +#define NUM_CHANNELS 3
> +
> static int
> vc4_atomic_check(struct drm_device *dev, struct drm_atomic_state *state)
> {
> - int ret;
> + unsigned long unassigned_channels = GENMASK(NUM_CHANNELS - 1, 0);
> + struct drm_crtc_state *crtc_state;
> + struct drm_crtc *crtc;
> + int i, ret;
> +
> + for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
> + struct vc4_crtc_state *vc4_crtc_state =
> + to_vc4_crtc_state(crtc_state);
> + struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
> + unsigned int matching_channels;
> +
> + if (!crtc_state->active)
> + continue;
> +
> + /*
> + * The problem we have to solve here is that we have
> + * up to 7 encoders, connected to up to 6 CRTCs.
> + *
> + * Those CRTCs, depending on the instance, can be
> + * routed to 1, 2 or 3 HVS FIFOs, and we need to set
> + * the change the muxing between FIFOs and outputs in
> + * the HVS accordingly.
> + *
> + * It would be pretty hard to come up with an
> + * algorithm that would generically solve
> + * this. However, the current routing trees we support
> + * allow us to simplify a bit the problem.
> + *
> + * Indeed, with the current supported layouts, if we
> + * try to assign in the ascending crtc index order the
> + * FIFOs, we can't fall into the situation where an
> + * earlier CRTC that had multiple routes is assigned
> + * one that was the only option for a later CRTC.
> + *
> + * If the layout changes and doesn't give us that in
> + * the future, we will need to have something smarter,
> + * but it works so far.
> + */
> + matching_channels = unassigned_channels & vc4_crtc->data->hvs_available_channels;
> + if (matching_channels) {
> + unsigned int channel = ffs(matching_channels) - 1;
> +
> + vc4_crtc_state->assigned_channel = channel;
> + unassigned_channels &= ~BIT(channel);
> + } else {
> + return -EINVAL;
> + }
> + }
>
> ret = vc4_ctm_atomic_check(dev, state);
> if (ret < 0)
> diff --git a/drivers/gpu/drm/vc4/vc4_regs.h b/drivers/gpu/drm/vc4/vc4_regs.h
> index 91b785725555..7fbac68b6fe1 100644
> --- a/drivers/gpu/drm/vc4/vc4_regs.h
> +++ b/drivers/gpu/drm/vc4/vc4_regs.h
> @@ -286,9 +286,19 @@
>
> #define SCALER_DISPID 0x00000008
> #define SCALER_DISPECTRL 0x0000000c
> +# define SCALER_DISPECTRL_DSP2_MUX_SHIFT 31
> +# define SCALER_DISPECTRL_DSP2_MUX_MASK VC4_MASK(31, 31)
> +
> #define SCALER_DISPPROF 0x00000010
> +
> #define SCALER_DISPDITHER 0x00000014
> +# define SCALER_DISPDITHER_DSP5_MUX_SHIFT 30
> +# define SCALER_DISPDITHER_DSP5_MUX_MASK VC4_MASK(31, 30)
> +
> #define SCALER_DISPEOLN 0x00000018
> +# define SCALER_DISPEOLN_DSP4_MUX_SHIFT 30
> +# define SCALER_DISPEOLN_DSP4_MUX_MASK VC4_MASK(31, 30)
> +
> #define SCALER_DISPLIST0 0x00000020
> #define SCALER_DISPLIST1 0x00000024
> #define SCALER_DISPLIST2 0x00000028
> diff --git a/drivers/gpu/drm/vc4/vc4_txp.c b/drivers/gpu/drm/vc4/vc4_txp.c
> index f39d9900d027..a2380d856000 100644
> --- a/drivers/gpu/drm/vc4/vc4_txp.c
> +++ b/drivers/gpu/drm/vc4/vc4_txp.c
> @@ -452,6 +452,7 @@ static irqreturn_t vc4_txp_interrupt(int irq, void *data)
> }
>
> static const struct vc4_crtc_data vc4_txp_crtc_data = {
> + .hvs_available_channels = BIT(2),
> .hvs_output = 2,
> };
>
> --
> git-series 0.9.1
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