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SubjectRe: [PATCH] drm/rockchip: Add AFBC support
Date
Hi Andrzej,

Thanks for the patch, it's nice to see another AFBC implementation
coming in.

For future versions, could you please Cc ayan.halder@arm.com? It would
have been nice to have someone @arm.com on patches which use/impact
Arm modifiers. Sadly I don't know how to make get_maintainer.pl help
with that.

Some more comments below.

On Mon, Sep 23, 2019 at 02:20:13PM +0200, Andrzej Pietrasiewicz wrote:
> From: Ezequiel Garcia <ezequiel@collabora.com>
>
> AFBC is a proprietary lossless image compression protocol and format.
> It helps reduce memory bandwidth of the graphics pipeline operations.
> This, in turn, improves power efficiency.
>
> Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
> [locking improvements]
> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
> [squashing the above, commit message and Rockchip AFBC modifier]
> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
> ---
> drivers/gpu/drm/rockchip/rockchip_drm_fb.c | 27 ++++++
> drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 94 ++++++++++++++++++++-
> drivers/gpu/drm/rockchip/rockchip_drm_vop.h | 12 +++
> drivers/gpu/drm/rockchip/rockchip_vop_reg.c | 18 ++++
> include/uapi/drm/drm_fourcc.h | 3 +
> 5 files changed, 151 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
> index 64ca87cf6d50..5178939a9c29 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
> @@ -24,6 +24,27 @@ static const struct drm_framebuffer_funcs rockchip_drm_fb_funcs = {
> .dirty = drm_atomic_helper_dirtyfb,
> };
>
> +static int
> +rockchip_verify_afbc_mod(struct drm_device *dev,
> + const struct drm_mode_fb_cmd2 *mode_cmd)
> +{
> + if (mode_cmd->modifier[0] &
> + ~DRM_FORMAT_MOD_ARM_AFBC(AFBC_FORMAT_MOD_ROCKCHIP)) {
> + DRM_DEV_ERROR(dev->dev,
> + "Unsupported format modifier 0x%llx\n",
> + mode_cmd->modifier[0]);
> + return -EINVAL;
> + }
> +
> + if (mode_cmd->width > 2560) {
> + DRM_DEV_ERROR(dev->dev,
> + "Unsupported width %d\n", mode_cmd->width);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> static struct drm_framebuffer *
> rockchip_fb_alloc(struct drm_device *dev, const struct drm_mode_fb_cmd2 *mode_cmd,
> struct drm_gem_object **obj, unsigned int num_planes)
> @@ -32,6 +53,12 @@ rockchip_fb_alloc(struct drm_device *dev, const struct drm_mode_fb_cmd2 *mode_cm
> int ret;
> int i;
>
> + if (mode_cmd->modifier[0]) {
> + ret = rockchip_verify_afbc_mod(dev, mode_cmd);
> + if (ret)
> + return ERR_PTR(ret);
> + }
> +
> fb = kzalloc(sizeof(*fb), GFP_KERNEL);
> if (!fb)
> return ERR_PTR(-ENOMEM);
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> index 21b68eea46cc..50bf214d21da 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> @@ -46,6 +46,13 @@
> vop_reg_set(vop, &win->phy->scl->ext->name, \
> win->base, ~0, v, #name)
>
> +#define VOP_AFBC_SET(x, name, v) \
> + do { \
> + if (vop->data->afbc) \
> + vop_reg_set(vop, &vop->data->afbc->name, \
> + 0, ~0, v, #name); \
> + } while (0)
> +
> #define VOP_WIN_YUV2YUV_SET(vop, win_yuv2yuv, name, v) \
> do { \
> if (win_yuv2yuv && win_yuv2yuv->name.mask) \
> @@ -123,6 +130,8 @@ struct vop {
> struct drm_device *drm_dev;
> bool is_enabled;
>
> + struct vop_win *afbc_win;
> +
> struct completion dsp_hold_completion;
>
> /* protected by dev->event_lock */
> @@ -245,6 +254,30 @@ static bool has_rb_swapped(uint32_t format)
> }
> }
>
> +#define AFBC_FMT_RGB565 0x0
> +#define AFBC_FMT_U8U8U8U8 0x5
> +#define AFBC_FMT_U8U8U8 0x4
> +
> +static int vop_convert_afbc_format(uint32_t format)
> +{

It would be great if you are able to follow the guidance Arm published
here: https://www.kernel.org/doc/html/latest/gpu/afbc.html, which will
help ensure interoperability and compatibility between different
devices/drivers. Hopefully it doesn't limit some use-cases for you -
if it does, let's discuss them.

Specifically, please take a look at the format list there. Some of
your formats below are not on the preferred interop list:

> + switch (format) {
> + case DRM_FORMAT_XRGB8888:

XRGB8888: Not preferred, as encoding the X channel is a waste of bits

> + case DRM_FORMAT_ARGB8888:

ARGB8888: Not preferred as the channel order prevents YTR

> + case DRM_FORMAT_XBGR8888:

XBGR8888: Not preferred, as encoding the X channel is a waste of bits

> + case DRM_FORMAT_ABGR8888:
> + return AFBC_FMT_U8U8U8U8;
> + case DRM_FORMAT_RGB888:

RGB888: Not preferred as the channel order prevents YTR

> + case DRM_FORMAT_BGR888:
> + return AFBC_FMT_U8U8U8;
> + case DRM_FORMAT_RGB565:

RGB565: Not preferred as the channel order prevents YTR

> + case DRM_FORMAT_BGR565:
> + return AFBC_FMT_RGB565;
> + default:
> + DRM_ERROR("unsupported afbc format[%08x]\n", format);
> + return -EINVAL;
> + }
> +}
> +
> static enum vop_data_format vop_convert_format(uint32_t format)
> {
> switch (format) {
> @@ -587,10 +620,16 @@ static int vop_enable(struct drm_crtc *crtc)
>
> vop_win_disable(vop, win);
> }
> - spin_unlock(&vop->reg_lock);
> +
> + if (vop->data->afbc) {
> + VOP_AFBC_SET(vop, enable, 0);
> + vop->afbc_win = NULL;
> + }
>
> vop_cfg_done(vop);
>
> + spin_unlock(&vop->reg_lock);
> +
> /*
> * At here, vop clock & iommu is enable, R/W vop regs would be safe.
> */
> @@ -719,6 +758,32 @@ static int vop_plane_atomic_check(struct drm_plane *plane,
> return -EINVAL;
> }
>
> + if (fb->modifier & DRM_FORMAT_MOD_ARM_AFBC(AFBC_FORMAT_MOD_ROCKCHIP)) {
> + struct vop *vop = to_vop(crtc);
> +
> + if (!vop->data->afbc) {
> + DRM_ERROR("VOP does not support AFBC\n");
> + return -EINVAL;
> + }
> +
> + ret = vop_convert_afbc_format(fb->format->format);
> + if (ret < 0)
> + return ret;
> +
> + if (state->src.x1 || state->src.y1) {
> + DRM_ERROR("AFBC does not support offset display\n");
> + DRM_ERROR("xpos=%d, ypos=%d, offset=%d\n",
> + state->src.x1, state->src.y1, fb->offsets[0]);
> + return -EINVAL;
> + }
> +
> + if (state->rotation && state->rotation != DRM_MODE_ROTATE_0) {
> + DRM_ERROR("AFBC does not support rotation\n");
> + DRM_ERROR("rotation=%d\n", state->rotation);
> + return -EINVAL;
> + }

It may be a good idea to check your framebuffer size, as the required
framebuffer size is different for AFBC. You can refer to mali-dp for
the calculations - perhaps even share the code.

> + }
> +
> return 0;
> }
>
> @@ -732,6 +797,9 @@ static void vop_plane_atomic_disable(struct drm_plane *plane,
> if (!old_state->crtc)
> return;
>
> + if (vop->afbc_win == vop_win)
> + vop->afbc_win = NULL;
> +
> spin_lock(&vop->reg_lock);
>
> vop_win_disable(vop, win);
> @@ -774,6 +842,9 @@ static void vop_plane_atomic_update(struct drm_plane *plane,
> if (WARN_ON(!vop->is_enabled))
> return;
>
> + if (vop->afbc_win == vop_win)
> + vop->afbc_win = NULL;
> +
> if (!state->visible) {
> vop_plane_atomic_disable(plane, old_state);
> return;
> @@ -808,6 +879,20 @@ static void vop_plane_atomic_update(struct drm_plane *plane,
>
> spin_lock(&vop->reg_lock);
>
> + if (fb->modifier & DRM_FORMAT_MOD_ARM_AFBC(AFBC_FORMAT_MOD_ROCKCHIP)) {
> + int afbc_format = vop_convert_afbc_format(fb->format->format);
> +
> + VOP_AFBC_SET(vop, format, afbc_format | 1 << 4);
> + VOP_AFBC_SET(vop, hreg_block_split, 0);
> + VOP_AFBC_SET(vop, win_sel, win_index);
> + VOP_AFBC_SET(vop, hdr_ptr, dma_addr);
> + VOP_AFBC_SET(vop, pic_size, act_info);
> +
> + vop->afbc_win = vop_win;
> +
> + pr_info("AFBC on plane %s\n", plane->name);
> + }
> +
> VOP_WIN_SET(vop, win, format, format);
> VOP_WIN_SET(vop, win, yrgb_vir, DIV_ROUND_UP(fb->pitches[0], 4));
> VOP_WIN_SET(vop, win, yrgb_mst, dma_addr);
> @@ -1163,6 +1248,7 @@ static void vop_crtc_atomic_flush(struct drm_crtc *crtc,
>
> spin_lock(&vop->reg_lock);
>
> + VOP_AFBC_SET(vop, enable, vop->afbc_win ? 0x1 : 0);
> vop_cfg_done(vop);
>
> spin_unlock(&vop->reg_lock);
> @@ -1471,7 +1557,8 @@ static int vop_create_crtc(struct vop *vop)
> 0, &vop_plane_funcs,
> win_data->phy->data_formats,
> win_data->phy->nformats,
> - NULL, win_data->type, NULL);
> + win_data->phy->format_modifiers,
> + win_data->type, NULL);
> if (ret) {
> DRM_DEV_ERROR(vop->dev, "failed to init plane %d\n",
> ret);
> @@ -1511,7 +1598,8 @@ static int vop_create_crtc(struct vop *vop)
> &vop_plane_funcs,
> win_data->phy->data_formats,
> win_data->phy->nformats,
> - NULL, win_data->type, NULL);
> + win_data->phy->format_modifiers,
> + win_data->type, NULL);
> if (ret) {
> DRM_DEV_ERROR(vop->dev, "failed to init overlay %d\n",
> ret);
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.h b/drivers/gpu/drm/rockchip/rockchip_drm_vop.h
> index 2149a889c29d..dc8b12025269 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.h
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.h
> @@ -77,6 +77,16 @@ struct vop_misc {
> struct vop_reg global_regdone_en;
> };
>
> +struct vop_afbc {
> + struct vop_reg enable;
> + struct vop_reg win_sel;
> + struct vop_reg format;
> + struct vop_reg hreg_block_split;
> + struct vop_reg pic_size;
> + struct vop_reg hdr_ptr;
> + struct vop_reg rstn;
> +};
> +
> struct vop_intr {
> const int *intrs;
> uint32_t nintrs;
> @@ -128,6 +138,7 @@ struct vop_win_phy {
> const struct vop_scl_regs *scl;
> const uint32_t *data_formats;
> uint32_t nformats;
> + const uint64_t *format_modifiers;
>
> struct vop_reg enable;
> struct vop_reg gate;
> @@ -169,6 +180,7 @@ struct vop_data {
> const struct vop_output *output;
> const struct vop_win_yuv2yuv_data *win_yuv2yuv;
> const struct vop_win_data *win;
> + const struct vop_afbc *afbc;
> unsigned int win_size;
>
> #define VOP_FEATURE_OUTPUT_RGB10 BIT(0)
> diff --git a/drivers/gpu/drm/rockchip/rockchip_vop_reg.c b/drivers/gpu/drm/rockchip/rockchip_vop_reg.c
> index 7b9c74750f6d..e9ff0c43c396 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_vop_reg.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_vop_reg.c
> @@ -30,6 +30,12 @@
> #define VOP_REG_MASK_SYNC(off, _mask, _shift) \
> _VOP_REG(off, _mask, _shift, true, false)
>
> +static const uint64_t format_modifiers_afbc[] = {
> + DRM_FORMAT_MOD_ARM_AFBC(AFBC_FORMAT_MOD_ROCKCHIP),
> + DRM_FORMAT_MOD_LINEAR,
> + DRM_FORMAT_MOD_INVALID
> +};
> +
> static const uint32_t formats_win_full[] = {
> DRM_FORMAT_XRGB8888,
> DRM_FORMAT_ARGB8888,
> @@ -667,6 +673,7 @@ static const struct vop_win_phy rk3368_win01_data = {
> .scl = &rk3288_win_full_scl,
> .data_formats = formats_win_full,
> .nformats = ARRAY_SIZE(formats_win_full),
> + .format_modifiers = format_modifiers_afbc,

I may have missed something, but don't you need to implement the
format_mod_supported hook on the plane to expose the modifiers to
userspace?

> .enable = VOP_REG(RK3368_WIN0_CTRL0, 0x1, 0),
> .format = VOP_REG(RK3368_WIN0_CTRL0, 0x7, 1),
> .rb_swap = VOP_REG(RK3368_WIN0_CTRL0, 0x1, 12),
> @@ -758,6 +765,16 @@ static const struct vop_data rk3366_vop = {
> .win_size = ARRAY_SIZE(rk3368_vop_win_data),
> };
>
> +static const struct vop_afbc rk3399_afbc = {
> + .rstn = VOP_REG(RK3399_AFBCD0_CTRL, 0x1, 3),
> + .enable = VOP_REG(RK3399_AFBCD0_CTRL, 0x1, 0),
> + .win_sel = VOP_REG(RK3399_AFBCD0_CTRL, 0x3, 1),
> + .format = VOP_REG(RK3399_AFBCD0_CTRL, 0x1f, 16),
> + .hreg_block_split = VOP_REG(RK3399_AFBCD0_CTRL, 0x1, 21),
> + .hdr_ptr = VOP_REG(RK3399_AFBCD0_HDR_PTR, 0xffffffff, 0),
> + .pic_size = VOP_REG(RK3399_AFBCD0_PIC_SIZE, 0xffffffff, 0),
> +};
> +
> static const struct vop_output rk3399_output = {
> .dp_pin_pol = VOP_REG(RK3399_DSP_CTRL1, 0xf, 16),
> .rgb_pin_pol = VOP_REG(RK3368_DSP_CTRL1, 0xf, 16),
> @@ -808,6 +825,7 @@ static const struct vop_data rk3399_vop_big = {
> .modeset = &rk3288_modeset,
> .output = &rk3399_output,
> .misc = &rk3368_misc,
> + .afbc = &rk3399_afbc,
> .win = rk3368_vop_win_data,
> .win_size = ARRAY_SIZE(rk3368_vop_win_data),
> .win_yuv2yuv = rk3399_vop_big_win_yuv2yuv_data,
> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> index 3feeaa3f987a..ba6caf06c824 100644
> --- a/include/uapi/drm/drm_fourcc.h
> +++ b/include/uapi/drm/drm_fourcc.h
> @@ -742,6 +742,9 @@ extern "C" {
> */
> #define AFBC_FORMAT_MOD_BCH (1ULL << 11)
>
> +#define AFBC_FORMAT_MOD_ROCKCHIP \
> + (AFBC_FORMAT_MOD_BLOCK_SIZE_16x16 | AFBC_FORMAT_MOD_SPARSE)
> +

As Neil said, this seems redundant. If you would like the convenience
macro, stick it in the Rockchip driver rather than UAPI.

Also, if your hardware is able to support YTR, I would recommend
enabling it.

Best regards,
-Brian

> /*
> * Allwinner tiled modifier
> *
> --
> 2.17.1
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
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