[RFC/WIP] drm/rockchip: Support CRTC gamma LUT
Ezequiel Garcia
ezequiel at collabora.com
Tue Jun 18 13:36:01 UTC 2019
On Thu, 2019-06-13 at 15:36 -0400, Ilia Mirkin wrote:
> Note that userspace may provide any size of gamma lut. Have a look at
> i915/intel_color.c:intel_color_check which filters out only the
> allowed sizes. Consider having a special allowance for 256-sized LUTs
> since that's what most legacy userspace will set, and it seems like a
> waste to create a 10-bit LUT for RGBA8 color.
>
Right. I will add a check for the gamma lut size.
Unfortunately, this hardware seems to only support 10-bit, 1024-sized LUTs.
The spec does mention a support 8-bit, 256-entries, but it's not at all
clear how configure that.
Thanks for the feedback,
Ezequiel
> -ilia
>
> On Thu, Jun 13, 2019 at 3:23 PM Ezequiel Garcia <ezequiel at collabora.com> wrote:
> > Add CRTC gamma LUT configuration on RK3288 and RK3399.
> >
> > Signed-off-by: Ezequiel Garcia <ezequiel at collabora.com>
> > ---
> > This patch seems to work well on RK3288, but produces
> > a distorted output on RK3399. I was hoping
> > someone could have any idea, so we can support both
> > platforms.
> >
> > drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 87 +++++++++++++++++++++
> > drivers/gpu/drm/rockchip/rockchip_drm_vop.h | 2 +
> > drivers/gpu/drm/rockchip/rockchip_vop_reg.c | 4 +
> > drivers/gpu/drm/rockchip/rockchip_vop_reg.h | 1 +
> > 4 files changed, 94 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> > index 12ed5265a90b..8381679c1045 100644
> > --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> > +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> > @@ -38,6 +38,8 @@
> > #include "rockchip_drm_vop.h"
> > #include "rockchip_rgb.h"
> >
> > +#define VOP_GAMMA_LUT_SIZE 1024
> > +
> > #define VOP_WIN_SET(vop, win, name, v) \
> > vop_reg_set(vop, &win->phy->name, win->base, ~0, v, #name)
> > #define VOP_SCL_SET(vop, win, name, v) \
> > @@ -137,6 +139,7 @@ struct vop {
> >
> > uint32_t *regsbak;
> > void __iomem *regs;
> > + void __iomem *lut_regs;
> >
> > /* physical map length of vop register */
> > uint32_t len;
> > @@ -1153,6 +1156,46 @@ static void vop_wait_for_irq_handler(struct vop *vop)
> > synchronize_irq(vop->irq);
> > }
> >
> > +static bool vop_dsp_lut_is_enable(struct vop *vop)
> > +{
> > + return vop_read_reg(vop, 0, &vop->data->common->dsp_lut_en);
> > +}
> > +
> > +static void vop_crtc_gamma_set(struct vop *vop, struct drm_crtc *crtc,
> > + struct drm_crtc_state *state)
> > +{
> > + struct drm_color_lut *lut;
> > + int i, idle, ret;
> > +
> > + if (!state->gamma_lut)
> > + return;
> > + lut = state->gamma_lut->data;
> > +
> > + spin_lock(&vop->reg_lock);
> > + VOP_REG_SET(vop, common, dsp_lut_en, 0);
> > + vop_cfg_done(vop);
> > + spin_unlock(&vop->reg_lock);
> > +
> > + ret = readx_poll_timeout(vop_dsp_lut_is_enable, vop,
> > + idle, !idle, 5, 10 * 30000);
> > + if (ret)
> > + return;
> > +
> > + spin_lock(&vop->reg_lock);
> > + for (i = 0; i < crtc->gamma_size; i++) {
> > + u32 word;
> > +
> > + word = (drm_color_lut_extract(lut[i].red, 10) << 20) |
> > + (drm_color_lut_extract(lut[i].green, 10) << 10) |
> > + drm_color_lut_extract(lut[i].blue, 10);
> > + writel(word, vop->lut_regs + i * 4);
> > + }
> > +
> > + VOP_REG_SET(vop, common, dsp_lut_en, 1);
> > + vop_cfg_done(vop);
> > + spin_unlock(&vop->reg_lock);
> > +}
> > +
> > static void vop_crtc_atomic_flush(struct drm_crtc *crtc,
> > struct drm_crtc_state *old_crtc_state)
> > {
> > @@ -1201,6 +1244,9 @@ static void vop_crtc_atomic_flush(struct drm_crtc *crtc,
> > drm_flip_work_queue(&vop->fb_unref_work, old_plane_state->fb);
> > set_bit(VOP_PENDING_FB_UNREF, &vop->pending);
> > }
> > +
> > + if (vop->lut_regs && crtc->state->color_mgmt_changed)
> > + vop_crtc_gamma_set(vop, crtc, crtc->state);
> > }
> >
> > static const struct drm_crtc_helper_funcs vop_crtc_helper_funcs = {
> > @@ -1323,6 +1369,7 @@ static const struct drm_crtc_funcs vop_crtc_funcs = {
> > .disable_vblank = vop_crtc_disable_vblank,
> > .set_crc_source = vop_crtc_set_crc_source,
> > .verify_crc_source = vop_crtc_verify_crc_source,
> > + .gamma_set = drm_atomic_helper_legacy_gamma_set,
> > };
> >
> > static void vop_fb_unref_worker(struct drm_flip_work *work, void *val)
> > @@ -1480,6 +1527,8 @@ static int vop_create_crtc(struct vop *vop)
> > goto err_cleanup_planes;
> >
> > drm_crtc_helper_add(crtc, &vop_crtc_helper_funcs);
> > + drm_mode_crtc_set_gamma_size(crtc, VOP_GAMMA_LUT_SIZE);
> > + drm_crtc_enable_color_mgmt(crtc, 0, false, VOP_GAMMA_LUT_SIZE);
> >
> > /*
> > * Create drm_planes for overlay windows with possible_crtcs restricted
> > @@ -1744,6 +1793,41 @@ int rockchip_drm_wait_vact_end(struct drm_crtc *crtc, unsigned int mstimeout)
> > }
> > EXPORT_SYMBOL(rockchip_drm_wait_vact_end);
> >
> > +static int vop_gamma_lut_request(struct device *dev,
> > + struct resource *res, struct vop *vop)
> > +{
> > + resource_size_t offset = vop->data->gamma_lut_addr_off;
> > + resource_size_t size = VOP_GAMMA_LUT_SIZE * 4;
> > +
> > + /*
> > + * Some SoCs (e.g. RK3288) have the gamma LUT address after
> > + * the MMU registers, which means we can't request and ioremap
> > + * the entire register set. Other (e.g. RK3399) have gamma LUT
> > + * address before MMU.
> > + *
> > + * Therefore, we need to request and ioremap those that haven't
> > + * been already.
> > + */
> > + if (vop->len >= (offset + size)) {
> > + vop->lut_regs = vop->regs + offset;
> > + return 0;
> > + }
> > +
> > + if (!devm_request_mem_region(dev, res->start + offset,
> > + size, dev_name(dev))) {
> > + dev_warn(dev, "can't request gamma lut region\n");
> > + return -EBUSY;
> > + }
> > +
> > + vop->lut_regs = devm_ioremap(dev, res->start + offset, size);
> > + if (!vop->lut_regs) {
> > + dev_err(dev, "can't ioremap gamma lut address\n");
> > + devm_release_mem_region(dev, res->start + offset, size);
> > + return -ENOMEM;
> > + }
> > + return 0;
> > +}
> > +
> > static int vop_bind(struct device *dev, struct device *master, void *data)
> > {
> > struct platform_device *pdev = to_platform_device(dev);
> > @@ -1776,6 +1860,9 @@ static int vop_bind(struct device *dev, struct device *master, void *data)
> > if (IS_ERR(vop->regs))
> > return PTR_ERR(vop->regs);
> >
> > + if (vop->data->gamma_lut_addr_off)
> > + vop_gamma_lut_request(dev, res, vop);
> > +
> > vop->regsbak = devm_kzalloc(dev, vop->len, GFP_KERNEL);
> > if (!vop->regsbak)
> > return -ENOMEM;
> > diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.h b/drivers/gpu/drm/rockchip/rockchip_drm_vop.h
> > index 2149a889c29d..12d5bde0d0bc 100644
> > --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.h
> > +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.h
> > @@ -67,6 +67,7 @@ struct vop_common {
> > struct vop_reg dither_down_mode;
> > struct vop_reg dither_down_en;
> > struct vop_reg dither_up;
> > + struct vop_reg dsp_lut_en;
> > struct vop_reg gate_en;
> > struct vop_reg mmu_en;
> > struct vop_reg out_mode;
> > @@ -170,6 +171,7 @@ struct vop_data {
> > const struct vop_win_yuv2yuv_data *win_yuv2yuv;
> > const struct vop_win_data *win;
> > unsigned int win_size;
> > + off_t gamma_lut_addr_off;
> >
> > #define VOP_FEATURE_OUTPUT_RGB10 BIT(0)
> > #define VOP_FEATURE_INTERNAL_RGB BIT(1)
> > diff --git a/drivers/gpu/drm/rockchip/rockchip_vop_reg.c b/drivers/gpu/drm/rockchip/rockchip_vop_reg.c
> > index 7b9c74750f6d..63fbb384893b 100644
> > --- a/drivers/gpu/drm/rockchip/rockchip_vop_reg.c
> > +++ b/drivers/gpu/drm/rockchip/rockchip_vop_reg.c
> > @@ -593,6 +593,7 @@ static const struct vop_common rk3288_common = {
> > .dither_down_en = VOP_REG(RK3288_DSP_CTRL1, 0x1, 2),
> > .pre_dither_down = VOP_REG(RK3288_DSP_CTRL1, 0x1, 1),
> > .dither_up = VOP_REG(RK3288_DSP_CTRL1, 0x1, 6),
> > + .dsp_lut_en = VOP_REG(RK3288_DSP_CTRL1, 0x1, 0),
> > .data_blank = VOP_REG(RK3288_DSP_CTRL0, 0x1, 19),
> > .dsp_blank = VOP_REG(RK3288_DSP_CTRL0, 0x3, 18),
> > .out_mode = VOP_REG(RK3288_DSP_CTRL0, 0xf, 0),
> > @@ -641,6 +642,7 @@ static const struct vop_data rk3288_vop = {
> > .output = &rk3288_output,
> > .win = rk3288_vop_win_data,
> > .win_size = ARRAY_SIZE(rk3288_vop_win_data),
> > + .gamma_lut_addr_off = RK3288_GAMMA_LUT_ADDR,
> > };
> >
> > static const int rk3368_vop_intrs[] = {
> > @@ -811,6 +813,7 @@ static const struct vop_data rk3399_vop_big = {
> > .win = rk3368_vop_win_data,
> > .win_size = ARRAY_SIZE(rk3368_vop_win_data),
> > .win_yuv2yuv = rk3399_vop_big_win_yuv2yuv_data,
> > + .gamma_lut_addr_off = RK3399_GAMMA_LUT_ADDR,
> > };
> >
> > static const struct vop_win_data rk3399_vop_lit_win_data[] = {
> > @@ -836,6 +839,7 @@ static const struct vop_data rk3399_vop_lit = {
> > .win = rk3399_vop_lit_win_data,
> > .win_size = ARRAY_SIZE(rk3399_vop_lit_win_data),
> > .win_yuv2yuv = rk3399_vop_lit_win_yuv2yuv_data,
> > + .gamma_lut_addr_off = RK3399_GAMMA_LUT_ADDR,
> > };
> >
> > static const struct vop_win_data rk3228_vop_win_data[] = {
> > diff --git a/drivers/gpu/drm/rockchip/rockchip_vop_reg.h b/drivers/gpu/drm/rockchip/rockchip_vop_reg.h
> > index 6e9fa5815d4d..490318382f74 100644
> > --- a/drivers/gpu/drm/rockchip/rockchip_vop_reg.h
> > +++ b/drivers/gpu/drm/rockchip/rockchip_vop_reg.h
> > @@ -113,6 +113,7 @@
> > #define RK3288_DSP_VACT_ST_END 0x0194
> > #define RK3288_DSP_VS_ST_END_F1 0x0198
> > #define RK3288_DSP_VACT_ST_END_F1 0x019c
> > +#define RK3288_GAMMA_LUT_ADDR 0x1000
> > /* register definition end */
> >
> > /* rk3368 register definition */
> > --
> > 2.20.1
> >
> > _______________________________________________
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> > dri-devel at lists.freedesktop.org
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