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Message-ID: <22e2b803.cd8.1916d581b67.Coremail.andyshrk@163.com>
Date: Tue, 20 Aug 2024 09:12:56 +0800 (CST)
From: "Andy Yan" <andyshrk@....com>
To: "Piotr Zalewski" <pZ010001011111@...ton.me>
Cc: hjc@...k-chips.com, heiko@...ech.de, andy.yan@...k-chips.com,
maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
tzimmermann@...e.de, airlied@...il.com, daniel@...ll.ch,
dri-devel@...ts.freedesktop.org,
linux-arm-kernel@...ts.infradead.org,
linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
"Daniel Stone" <daniel@...ishbar.org>,
"Dragan Simic" <dsimic@...jaro.org>,
"Diederik de Haas" <didi.debian@...ow.org>
Subject: Re:[PATCH v4] rockchip/drm: vop2: add support for gamma LUT
Hi Piotr，
At 2024-08-16 15:39:35, "Piotr Zalewski" <pZ010001011111@...ton.me> wrote:
>Add support for gamma LUT in VOP2 driver. The implementation was inspired
>by one found in VOP1 driver. Blue and red channels in gamma LUT register
>write were swapped with respect to how gamma LUT values are written in
>VOP1. If the current SoC is RK3566 or RK3568 and gamma LUT is to be
>written, full modeset is triggered to synchronize disable, write, enable
>process and hint userspace that it is not seamless transition[1]. If the
>current SoC is RK3588 full modeset isn't triggered because gamma LUT need
>not to be disabled before the LUT write[1]. In case of RK356x as well as
>RK3588 respective LUT port sel register write was added before the LUT
>write[2]. In case of RK3588, gamma update enable bit is set after setting
>gamma LUT enable bit[2]. Gamma size is set and drm color management is
>enabled for each video port's CRTC except ones which have no associated
>device. Tested on RK3566 (Pinetab2).
>
>[1] https://lore.kernel.org/linux-rockchip/CAPj87rOM=j0zmuWL9frGKV1xzPbJrk=Q9ip7F_HAPYnbCqPouw@mail.gmail.com/
>[2] https://lore.kernel.org/linux-rockchip/7d998e4c-e1d3-4e8b-af76-c5bc83b43647@rock-chips.com/
>
>Helped-by: Daniel Stone <daniel@...ishbar.org>
>Helped-by: Dragan Simic <dsimic@...jaro.org>
>Helped-by: Diederik de Haas <didi.debian@...ow.org>
>Helped-by: Andy Yan <andy.yan@...k-chips.com>
>Signed-off-by: Piotr Zalewski <pZ010001011111@...ton.me>
>---
>
>Notes:
> WASN'T tested on RK3588.
>
> Changes in v4:
> - rework the implementation to better utilize DRM atomic updates[2]
> - handle the RK3588 case[2][3]
>
> Changes in v3:
> - v3 is patch v2 "resend", by mistake the incremental patch was
> sent in v2
>
> Changes in v2:
> - Apply code styling corrections[1]
> - Move gamma LUT write inside the vop2 lock
>
> Link to v3: https://lore.kernel.org/linux-rockchip/TkgKVivuaLFLILPY-n3iZo_8KF-daKdqdu-0_e0HP-5Ar_8DALDeNWog2suwWKjX7eomcbGET0KZe7DlzdhK2YM6CbLbeKeFZr-MJzJMtw0=@proton.me/
> Link to v2: https://lore.kernel.org/linux-rockchip/Hk03HDb6wSSHWtEFZHUye06HR0-9YzP5nCHx9A8_kHzWSZawDrU1o1pjEGkCOJFoRg0nTB4BWEv6V0XBOjF4-0Mj44lp2TrjaQfnytzp-Pk=@proton.me/T/#u
> Link to v1: https://lore.kernel.org/linux-rockchip/9736eadf6a9d8e97eef919c6b3d88828@manjaro.org/T/#t
>
> [1] https://lore.kernel.org/linux-rockchip/d019761504b540600d9fc7a585d6f95f@manjaro.org
> [2] https://lore.kernel.org/linux-rockchip/CAPj87rOM=j0zmuWL9frGKV1xzPbJrk=Q9ip7F_HAPYnbCqPouw@mail.gmail.com
> [3] https://lore.kernel.org/linux-rockchip/7d998e4c-e1d3-4e8b-af76-c5bc83b43647@rock-chips.com
>
> drivers/gpu/drm/rockchip/rockchip_drm_vop2.c | 148 +++++++++++++++++++
> drivers/gpu/drm/rockchip/rockchip_drm_vop2.h | 5 +
> 2 files changed, 153 insertions(+)
>
>diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
>index 9873172e3fd3..fe7657984909 100644
>--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
>+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
>@@ -278,6 +278,15 @@ static u32 vop2_readl(struct vop2 *vop2, u32 offset)
> return val;
> }
>
>+static u32 vop2_vp_read(struct vop2_video_port *vp, u32 offset)
>+{
>+ u32 val;
>+
>+ regmap_read(vp->vop2->map, vp->data->offset + offset, &val);
>+
>+ return val;
>+}
>+
> static void vop2_win_write(const struct vop2_win *win, unsigned int reg, u32 v)
> {
> regmap_field_write(win->reg[reg], v);
>@@ -998,6 +1007,30 @@ static void vop2_disable(struct vop2 *vop2)
> clk_disable_unprepare(vop2->hclk);
> }
>
>+static void vop2_vp_dsp_lut_disable(struct vop2_video_port *vp)
>+{
>+ u32 dsp_ctrl = vop2_vp_read(vp, RK3568_VP_DSP_CTRL);
>+
>+ dsp_ctrl &= ~RK3568_VP_DSP_CTRL__DSP_LUT_EN;
>+ vop2_vp_write(vp, RK3568_VP_DSP_CTRL, dsp_ctrl);
>+}
>+
>+static void vop2_vp_dsp_lut_enable(struct vop2_video_port *vp)
>+{
>+ u32 dsp_ctrl = vop2_vp_read(vp, RK3568_VP_DSP_CTRL);
>+
>+ dsp_ctrl |= RK3568_VP_DSP_CTRL__DSP_LUT_EN;
>+ vop2_vp_write(vp, RK3568_VP_DSP_CTRL, dsp_ctrl);
>+}
>+
>+static void vop2_vp_dsp_lut_update_enable(struct vop2_video_port *vp)
>+{
>+ u32 dsp_ctrl = vop2_vp_read(vp, RK3568_VP_DSP_CTRL);
>+
>+ dsp_ctrl |= RK3588_VP_DSP_CTRL__GAMMA_UPDATE_EN;
>+ vop2_vp_write(vp, RK3568_VP_DSP_CTRL, dsp_ctrl);
>+}
>+
> static void vop2_crtc_atomic_disable(struct drm_crtc *crtc,
> struct drm_atomic_state *state)
> {
>@@ -1482,6 +1515,24 @@ static bool vop2_crtc_mode_fixup(struct drm_crtc *crtc,
> return true;
> }
>
>+static void vop2_crtc_write_gamma_lut(struct vop2 *vop2, struct drm_crtc *crtc)
>+{
>+ const struct vop2_video_port *vp = to_vop2_video_port(crtc);
>+ const struct vop2_video_port_data *vp_data = &vop2->data->vp[vp->id];
>+
>+ struct drm_color_lut *lut = crtc->state->gamma_lut->data;
>+ unsigned int i, bpc = ilog2(vp_data->gamma_lut_len);
>+ u32 word;
>+
>+ for (i = 0; i < crtc->gamma_size; i++) {
>+ word = (drm_color_lut_extract(lut[i].blue, bpc) << (2 * bpc)) |
>+ (drm_color_lut_extract(lut[i].green, bpc) << bpc) |
>+ drm_color_lut_extract(lut[i].red, bpc);
>+
>+ writel(word, vop2->lut_regs + i * 4);
>+ }
>+}
>+
> static void vop2_dither_setup(struct drm_crtc *crtc, u32 *dsp_ctrl)
> {
> struct rockchip_crtc_state *vcstate = to_rockchip_crtc_state(crtc->state);
>@@ -2062,6 +2113,42 @@ static void vop2_crtc_atomic_enable(struct drm_crtc *crtc,
> vop2_unlock(vop2);
> }
>
>+static int vop2_crtc_atomic_check_gamma(struct vop2_video_port *vp,
>+ struct drm_crtc *crtc,
>+ struct drm_atomic_state *state,
>+ struct drm_crtc_state *crtc_state)
>+{
>+ struct vop2 *vop2 = vp->vop2;
>+ unsigned int len;
>+
>+ if (!vp->vop2->lut_regs || !crtc_state->color_mgmt_changed ||
>+ !crtc_state->gamma_lut)
>+ return 0;
>+
>+ len = drm_color_lut_size(crtc_state->gamma_lut);
>+ if (len != crtc->gamma_size) {
>+ DRM_DEBUG_KMS("Invalid LUT size; got %d, expected %d\n",
>+ len, crtc->gamma_size);
>+ return -EINVAL;
>+ }
>+
>+ // trigger full modeset only when SoC is 356x
>+ if (!crtc_state->mode_changed && (vop2->data->soc_id == 3566 ||
>+ vop2->data->soc_id == 3568)) {
>+ int ret;
>+
>+ crtc_state->mode_changed = true;
>+ state->allow_modeset = true;
We don't need to trigger a modeset here. We just need to disable dsp_lut befor we write gamma lut data for rk3566/8.
>+
>+ ret = drm_atomic_helper_check_modeset(crtc->dev,
>+ crtc_state->state);
>+ if (ret)
>+ return ret;
>+ }
>+
>+ return 0;
>+}
>+
> static int vop2_crtc_atomic_check(struct drm_crtc *crtc,
> struct drm_atomic_state *state)
> {
>@@ -2069,6 +2156,11 @@ static int vop2_crtc_atomic_check(struct drm_crtc *crtc,
> struct drm_plane *plane;
> int nplanes = 0;
> struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
>+ int ret;
>+
>+ ret = vop2_crtc_atomic_check_gamma(vp, crtc, state, crtc_state);
>+ if (ret)
>+ return ret;
>
> drm_atomic_crtc_state_for_each_plane(plane, crtc_state)
> nplanes++;
>@@ -2456,9 +2548,32 @@ static void vop2_setup_dly_for_windows(struct vop2 *vop2)
> vop2_writel(vop2, RK3568_SMART_DLY_NUM, sdly);
> }
>
>+static void vop2_crtc_atomic_begin_gamma(struct vop2 *vop2,
>+ struct vop2_video_port *vp,
>+ struct drm_crtc *crtc,
>+ struct drm_crtc_state *crtc_state)
>+{
>+ if (vop2->lut_regs && crtc_state->color_mgmt_changed &&
>+ crtc_state->gamma_lut) {
>+ vop2_lock(vop2);
>+ if (vop2->data->soc_id == 3566 || vop2->data->soc_id == 3568) {
>+ vop2_writel(vop2, RK3568_LUT_PORT_SEL, vp->id);
>+ } else {
>+ vop2_writel(vop2, RK3568_LUT_PORT_SEL, FIELD_PREP(
>+ RK3588_LUT_PORT_SEL__GAMMA_AHB_WRITE_SEL,
>+ vp->id));
>+ }
>+ vop2_crtc_write_gamma_lut(vop2, crtc);
>+
>+ vop2_unlock(vop2);
>+ }
>+}
>+
> static void vop2_crtc_atomic_begin(struct drm_crtc *crtc,
> struct drm_atomic_state *state)
> {
>+ struct drm_crtc_state *crtc_state =
>+ drm_atomic_get_new_crtc_state(state, crtc);
> struct vop2_video_port *vp = to_vop2_video_port(crtc);
> struct vop2 *vop2 = vp->vop2;
> struct drm_plane *plane;
>@@ -2482,13 +2597,39 @@ static void vop2_crtc_atomic_begin(struct drm_crtc *crtc,
> vop2_setup_layer_mixer(vp);
> vop2_setup_alpha(vp);
> vop2_setup_dly_for_windows(vop2);
>+
>+ vop2_crtc_atomic_begin_gamma(vop2, vp, crtc, crtc_state);
>+}
>+
>+static void vop2_crtc_atomic_flush_gamma(struct vop2 *vop2,
>+ struct vop2_video_port *vp,
>+ struct drm_crtc_state *crtc_state)
>+{
>+ if (vop2->lut_regs && crtc_state->color_mgmt_changed) {
>+ vop2_lock(vop2);
>+
>+ if (crtc_state->gamma_lut) {
>+ vop2_vp_dsp_lut_enable(vp);
>+ if (vop2->data->soc_id != 3566 &&
>+ vop2->data->soc_id != 3568)
>+ vop2_vp_dsp_lut_update_enable(vp);
>+
>+ } else
>+ vop2_vp_dsp_lut_disable(vp);
>+
>+ vop2_unlock(vop2);
>+ }
> }
>
> static void vop2_crtc_atomic_flush(struct drm_crtc *crtc,
> struct drm_atomic_state *state)
> {
>+ struct drm_crtc_state *crtc_state =
>+ drm_atomic_get_new_crtc_state(state, crtc);
> struct vop2_video_port *vp = to_vop2_video_port(crtc);
>
>+ vop2_crtc_atomic_flush_gamma(vp->vop2, vp, crtc_state);
>+
> vop2_post_config(crtc);
>
> vop2_cfg_done(vp);
>@@ -2791,6 +2932,13 @@ static int vop2_create_crtcs(struct vop2 *vop2)
>
> drm_crtc_helper_add(&vp->crtc, &vop2_crtc_helper_funcs);
>
>+ if (vop2->lut_regs && vp->crtc.dev != NULL) {
>+ const struct vop2_video_port_data *vp_data = &vop2_data->vp[vp->id];
>+
>+ drm_mode_crtc_set_gamma_size(&vp->crtc, vp_data->gamma_lut_len);
>+ drm_crtc_enable_color_mgmt(&vp->crtc, 0, false,
>+ vp_data->gamma_lut_len);
>+ }
> init_completion(&vp->dsp_hold_completion);
> }
>
>diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.h b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.h
>index 615a16196aff..510dda6f9092 100644
>--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.h
>+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.h
>@@ -394,6 +394,7 @@ enum dst_factor_mode {
> #define RK3568_REG_CFG_DONE__GLB_CFG_DONE_EN BIT(15)
>
> #define RK3568_VP_DSP_CTRL__STANDBY BIT(31)
>+#define RK3568_VP_DSP_CTRL__DSP_LUT_EN BIT(28)
> #define RK3568_VP_DSP_CTRL__DITHER_DOWN_MODE BIT(20)
> #define RK3568_VP_DSP_CTRL__DITHER_DOWN_SEL GENMASK(19, 18)
> #define RK3568_VP_DSP_CTRL__DITHER_DOWN_EN BIT(17)
>@@ -408,6 +409,8 @@ enum dst_factor_mode {
> #define RK3568_VP_DSP_CTRL__CORE_DCLK_DIV BIT(4)
> #define RK3568_VP_DSP_CTRL__OUT_MODE GENMASK(3, 0)
>
>+#define RK3588_VP_DSP_CTRL__GAMMA_UPDATE_EN BIT(22)
>+
> #define RK3588_VP_CLK_CTRL__DCLK_OUT_DIV GENMASK(3, 2)
> #define RK3588_VP_CLK_CTRL__DCLK_CORE_DIV GENMASK(1, 0)
>
>@@ -460,6 +463,8 @@ enum dst_factor_mode {
> #define RK3588_DSP_IF_POL__DP1_PIN_POL GENMASK(14, 12)
> #define RK3588_DSP_IF_POL__DP0_PIN_POL GENMASK(10, 8)
>
>+#define RK3588_LUT_PORT_SEL__GAMMA_AHB_WRITE_SEL GENMASK(13, 12)
>+
> #define RK3568_VP0_MIPI_CTRL__DCLK_DIV2_PHASE_LOCK BIT(5)
> #define RK3568_VP0_MIPI_CTRL__DCLK_DIV2 BIT(4)
>
>--
>2.46.0
>
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