Re: [PATCH 1/1] drm/mediatek: Add support for mediatek SOC MT2712

From: Stu Hsieh
Date: Tue May 22 2018 - 02:53:01 EST

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Hi, CK:

I've some reply for comment

On Tue, 2018-05-15 at 10:30 +0800, CK Hu wrote:
> Hi, Stu:
>
> I've some inline comments.
>
> On Mon, 2018-05-14 at 17:59 +0800, Stu Hsieh wrote:
> > This patch add support for the Mediatek MT2712 DISP subsystem.
> > There are two OVL engine and three disp output in MT2712.
> >
> > Signed-off-by: Stu Hsieh <stu.hsieh@xxxxxxxxxxxx>
> > ---
> > drivers/gpu/drm/mediatek/mtk_drm_ddp.c | 77 ++++++++++++++++++++++++++---
> > drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 4 ++
> > drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 3 ++
> > drivers/gpu/drm/mediatek/mtk_drm_drv.c | 44 +++++++++++++++++
> > drivers/gpu/drm/mediatek/mtk_drm_drv.h | 7 ++-
> > 5 files changed, 127 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> > index 8130f3dab661..641f4361b006 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> > @@ -29,6 +29,8 @@
> > #define DISP_REG_CONFIG_DISP_COLOR0_SEL_IN 0x084
> > #define DISP_REG_CONFIG_DISP_COLOR1_SEL_IN 0x088
> > #define DISP_REG_CONFIG_DPI_SEL_IN 0x0ac
> > +#define DISP_REG_CONFIG_DISP_RDMA2_SOUT 0x0b8
> > +#define DISP_REG_CONFIG_DISP_RDMA0_MOUT_EN 0x0c4
> > #define DISP_REG_CONFIG_DISP_RDMA1_MOUT_EN 0x0c8
> > #define DISP_REG_CONFIG_MMSYS_CG_CON0 0x100
> >
> > @@ -41,6 +43,7 @@
> > #define DISP_REG_MUTEX_RST(n) (0x28 + 0x20 * (n))
> > #define DISP_REG_MUTEX_MOD(n) (0x2c + 0x20 * (n))
> > #define DISP_REG_MUTEX_SOF(n) (0x30 + 0x20 * (n))
> > +#define DISP_REG_MUTEX_MOD2(n) (0x34 + 0x20 * (n))
> >
> > #define INT_MUTEX BIT(1)
> >
> > @@ -60,6 +63,25 @@
> > #define MT8173_MUTEX_MOD_DISP_PWM1 BIT(24)
> > #define MT8173_MUTEX_MOD_DISP_OD BIT(25)
> >
> > +#define MT2712_MUTEX_MOD_DISP_OVL0 BIT(11)
> > +#define MT2712_MUTEX_MOD_DISP_OVL1 BIT(12)
> > +#define MT2712_MUTEX_MOD_DISP_RDMA0 BIT(13)
> > +#define MT2712_MUTEX_MOD_DISP_RDMA1 BIT(14)
> > +#define MT2712_MUTEX_MOD_DISP_RDMA2 BIT(15)
> > +#define MT2712_MUTEX_MOD_DISP_WDMA0 BIT(16)
> > +#define MT2712_MUTEX_MOD_DISP_WDMA1 BIT(17)
> > +#define MT2712_MUTEX_MOD_DISP_COLOR0 BIT(18)
> > +#define MT2712_MUTEX_MOD_DISP_COLOR1 BIT(19)
> > +#define MT2712_MUTEX_MOD_DISP_AAL BIT(20)
> > +#define MT2712_MUTEX_MOD_DISP_UFOE BIT(22)
> > +#define MT2712_MUTEX_MOD_DISP_PWM0 BIT(23)
> > +#define MT2712_MUTEX_MOD_DISP_PWM1 BIT(24)
> > +#define MT2712_MUTEX_MOD_DISP_PWM2 BIT(10)
> > +#define MT2712_MUTEX_MOD_DISP_OD BIT(25)
> > +/* modules more than 32, add BIT(31) when using DISP_REG_MUTEX_MOD2 bit */
> > +#define MT2712_MUTEX_MOD2_DISP_AAL1 (BIT(1) | BIT(31))
> > +#define MT2712_MUTEX_MOD2_DISP_OD1 (BIT(2) | BIT(31))
> > +
>
> It looks like that MUTEX_MOD definition varies for each SoC. I think
> such definition should be passed from dts to prevent modify driver for
> each SoC. For example, the clock definition varies for each SoC, and its
> definition is placed in [1]. The dts [2] include the header file and
> pass the clock definition to driver.
> [1]
> https://elixir.bootlin.com/linux/v4.17-rc5/source/include/dt-bindings/clock/mt2712-clk.h
> [2]
> https://elixir.bootlin.com/linux/v4.17-rc5/source/arch/arm64/boot/dts/mediatek/mt2712e.dtsi
>
This idea is good but weak relation for this MT2712 patch
In the future, we would commit other patch serial for this issue

> > #define MT2701_MUTEX_MOD_DISP_OVL BIT(3)
> > #define MT2701_MUTEX_MOD_DISP_WDMA BIT(6)
> > #define MT2701_MUTEX_MOD_DISP_COLOR BIT(7)
> > @@ -74,6 +96,7 @@
> >
> > #define OVL0_MOUT_EN_COLOR0 0x1
> > #define OD_MOUT_EN_RDMA0 0x1
> > +#define OD1_MOUT_EN_RDMA1 BIT(16)
> > #define UFOE_MOUT_EN_DSI0 0x1
> > #define COLOR0_SEL_IN_OVL0 0x1
> > #define OVL1_MOUT_EN_COLOR1 0x1
> > @@ -108,6 +131,26 @@ static const unsigned int mt2701_mutex_mod[DDP_COMPONENT_ID_MAX] = {
> > [DDP_COMPONENT_WDMA0] = MT2701_MUTEX_MOD_DISP_WDMA,
> > };
> >
> > +static const unsigned int mt2712_mutex_mod[DDP_COMPONENT_ID_MAX] = {
> > + [DDP_COMPONENT_AAL] = MT2712_MUTEX_MOD_DISP_AAL,
> > + [DDP_COMPONENT_AAL1] = MT2712_MUTEX_MOD2_DISP_AAL1,
> > + [DDP_COMPONENT_COLOR0] = MT2712_MUTEX_MOD_DISP_COLOR0,
> > + [DDP_COMPONENT_COLOR1] = MT2712_MUTEX_MOD_DISP_COLOR1,
> > + [DDP_COMPONENT_OD] = MT2712_MUTEX_MOD_DISP_OD,
> > + [DDP_COMPONENT_OD1] = MT2712_MUTEX_MOD2_DISP_OD1,
> > + [DDP_COMPONENT_OVL0] = MT2712_MUTEX_MOD_DISP_OVL0,
> > + [DDP_COMPONENT_OVL1] = MT2712_MUTEX_MOD_DISP_OVL1,
> > + [DDP_COMPONENT_PWM0] = MT2712_MUTEX_MOD_DISP_PWM0,
> > + [DDP_COMPONENT_PWM1] = MT2712_MUTEX_MOD_DISP_PWM1,
> > + [DDP_COMPONENT_PWM2] = MT2712_MUTEX_MOD_DISP_PWM2,
> > + [DDP_COMPONENT_RDMA0] = MT2712_MUTEX_MOD_DISP_RDMA0,
> > + [DDP_COMPONENT_RDMA1] = MT2712_MUTEX_MOD_DISP_RDMA1,
> > + [DDP_COMPONENT_RDMA2] = MT2712_MUTEX_MOD_DISP_RDMA2,
> > + [DDP_COMPONENT_UFOE] = MT2712_MUTEX_MOD_DISP_UFOE,
> > + [DDP_COMPONENT_WDMA0] = MT2712_MUTEX_MOD_DISP_WDMA0,
> > + [DDP_COMPONENT_WDMA1] = MT2712_MUTEX_MOD_DISP_WDMA1,
> > +};
> > +
> > static const unsigned int mt8173_mutex_mod[DDP_COMPONENT_ID_MAX] = {
> > [DDP_COMPONENT_AAL] = MT8173_MUTEX_MOD_DISP_AAL,
> > [DDP_COMPONENT_COLOR0] = MT8173_MUTEX_MOD_DISP_COLOR0,
> > @@ -150,6 +193,9 @@ static unsigned int mtk_ddp_mout_en(enum mtk_ddp_comp_id cur,
> > } else if (cur == DDP_COMPONENT_GAMMA && next == DDP_COMPONENT_RDMA1) {
> > *addr = DISP_REG_CONFIG_DISP_GAMMA_MOUT_EN;
> > value = GAMMA_MOUT_EN_RDMA1;
> > + } else if (cur == DDP_COMPONENT_OD1 && next == DDP_COMPONENT_RDMA1) {
> > + *addr = DISP_REG_CONFIG_DISP_OD_MOUT_EN;
> > + value = OD1_MOUT_EN_RDMA1;
>
> I think this should be moved to an independent patch and its title is
> 'add connection from OD1 to RDMA1'.
ok
>
> > } else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DPI0) {
> > *addr = DISP_REG_CONFIG_DISP_RDMA1_MOUT_EN;
> > value = RDMA1_MOUT_DPI0;
> > @@ -278,6 +324,7 @@ void mtk_disp_mutex_add_comp(struct mtk_disp_mutex *mutex,
> > struct mtk_ddp *ddp = container_of(mutex, struct mtk_ddp,
> > mutex[mutex->id]);
> > unsigned int reg;
> > + unsigned int offset;
> >
> > WARN_ON(&ddp->mutex[mutex->id] != mutex);
> >
> > @@ -292,9 +339,17 @@ void mtk_disp_mutex_add_comp(struct mtk_disp_mutex *mutex,
> > reg = MUTEX_SOF_DPI0;
> > break;
> > default:
> > - reg = readl_relaxed(ddp->regs + DISP_REG_MUTEX_MOD(mutex->id));
> > - reg |= ddp->mutex_mod[id];
> > - writel_relaxed(reg, ddp->regs + DISP_REG_MUTEX_MOD(mutex->id));
> > + if (ddp->mutex_mod[id] <= BIT(31)) {
>
> You could reduce one byte if you write as
ok

> if (ddp->mutex_mod[id] < BIT(32))
>
> > + offset = DISP_REG_MUTEX_MOD(mutex->id);
> > + reg = readl_relaxed(ddp->regs + offset);
> > + reg |= ddp->mutex_mod[id];
> > + writel_relaxed(reg, ddp->regs + offset);
> > + } else {
> > + offset = DISP_REG_MUTEX_MOD2(mutex->id);
> > + reg = readl_relaxed(ddp->regs + offset);
> > + reg |= (ddp->mutex_mod[id] & ~BIT(31));
> > + writel_relaxed(reg, ddp->regs + offset);
> > + }
>
> I think this should be moved to an independent patch and its title is
> 'support maximum 64 mutex mod'.
ok
>
> > return;
> > }
> >
> > @@ -307,6 +362,7 @@ void mtk_disp_mutex_remove_comp(struct mtk_disp_mutex *mutex,
> > struct mtk_ddp *ddp = container_of(mutex, struct mtk_ddp,
> > mutex[mutex->id]);
> > unsigned int reg;
> > + unsigned int offset;
> >
> > WARN_ON(&ddp->mutex[mutex->id] != mutex);
> >
> > @@ -318,9 +374,17 @@ void mtk_disp_mutex_remove_comp(struct mtk_disp_mutex *mutex,
> > ddp->regs + DISP_REG_MUTEX_SOF(mutex->id));
> > break;
> > default:
> > - reg = readl_relaxed(ddp->regs + DISP_REG_MUTEX_MOD(mutex->id));
> > - reg &= ~(ddp->mutex_mod[id]);
> > - writel_relaxed(reg, ddp->regs + DISP_REG_MUTEX_MOD(mutex->id));
> > + if (ddp->mutex_mod[id] <= BIT(31)) {
> > + offset = DISP_REG_MUTEX_MOD(mutex->id);
> > + reg = readl_relaxed(ddp->regs + offset);
> > + reg &= ~(ddp->mutex_mod[id]);
> > + writel_relaxed(reg, ddp->regs + offset);
> > + } else {
> > + offset = DISP_REG_MUTEX_MOD2(mutex->id);
> > + reg = readl_relaxed(ddp->regs + offset);
> > + reg &= ~(ddp->mutex_mod[id] & ~BIT(31));
> > + writel_relaxed(reg, ddp->regs + offset);
> > + }
> > break;
> > }
> > }
> > @@ -407,6 +471,7 @@ static int mtk_ddp_remove(struct platform_device *pdev)
> >
> > static const struct of_device_id ddp_driver_dt_match[] = {
> > { .compatible = "mediatek,mt2701-disp-mutex", .data = mt2701_mutex_mod},
> > + { .compatible = "mediatek,mt2712-disp-mutex", .data = mt2712_mutex_mod},
> > { .compatible = "mediatek,mt8173-disp-mutex", .data = mt8173_mutex_mod},
> > {},
> > };
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> > index 4672317e3ad1..ebe8f0018b31 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> > @@ -219,6 +219,7 @@ struct mtk_ddp_comp_match {
> >
> > static const struct mtk_ddp_comp_match mtk_ddp_matches[DDP_COMPONENT_ID_MAX] = {
> > [DDP_COMPONENT_AAL] = { MTK_DISP_AAL, 0, &ddp_aal },
> > + [DDP_COMPONENT_AAL1] = { MTK_DISP_AAL, 1, &ddp_aal },
>
> For the naming consistency, there are COLOR0 and COLOR1, so after you
> add 'AAL1', you should change AAL to AAL0. And this modification should
> be an independent patch.
ok
>
> > [DDP_COMPONENT_BLS] = { MTK_DISP_BLS, 0, NULL },
> > [DDP_COMPONENT_COLOR0] = { MTK_DISP_COLOR, 0, NULL },
> > [DDP_COMPONENT_COLOR1] = { MTK_DISP_COLOR, 1, NULL },
> > @@ -227,9 +228,12 @@ static const struct mtk_ddp_comp_match mtk_ddp_matches[DDP_COMPONENT_ID_MAX] = {
> > [DDP_COMPONENT_DSI1] = { MTK_DSI, 1, NULL },
> > [DDP_COMPONENT_GAMMA] = { MTK_DISP_GAMMA, 0, &ddp_gamma },
> > [DDP_COMPONENT_OD] = { MTK_DISP_OD, 0, &ddp_od },
> > + [DDP_COMPONENT_OD1] = { MTK_DISP_OD, 1, &ddp_od },
>
> Ditto.
ok
>
> > [DDP_COMPONENT_OVL0] = { MTK_DISP_OVL, 0, NULL },
> > [DDP_COMPONENT_OVL1] = { MTK_DISP_OVL, 1, NULL },
> > [DDP_COMPONENT_PWM0] = { MTK_DISP_PWM, 0, NULL },
> > + [DDP_COMPONENT_PWM1] = { MTK_DISP_PWM, 1, NULL },
> > + [DDP_COMPONENT_PWM2] = { MTK_DISP_PWM, 2, NULL },
> > [DDP_COMPONENT_RDMA0] = { MTK_DISP_RDMA, 0, NULL },
> > [DDP_COMPONENT_RDMA1] = { MTK_DISP_RDMA, 1, NULL },
> > [DDP_COMPONENT_RDMA2] = { MTK_DISP_RDMA, 2, NULL },
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> > index 0828cf8bf85c..43100f9215ae 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> > @@ -42,6 +42,7 @@ enum mtk_ddp_comp_type {
> >
> > enum mtk_ddp_comp_id {
> > DDP_COMPONENT_AAL,
> > + DDP_COMPONENT_AAL1,
> > DDP_COMPONENT_BLS,
> > DDP_COMPONENT_COLOR0,
> > DDP_COMPONENT_COLOR1,
> > @@ -50,10 +51,12 @@ enum mtk_ddp_comp_id {
> > DDP_COMPONENT_DSI1,
> > DDP_COMPONENT_GAMMA,
> > DDP_COMPONENT_OD,
> > + DDP_COMPONENT_OD1,
> > DDP_COMPONENT_OVL0,
> > DDP_COMPONENT_OVL1,
> > DDP_COMPONENT_PWM0,
> > DDP_COMPONENT_PWM1,
> > + DDP_COMPONENT_PWM2,
> > DDP_COMPONENT_RDMA0,
> > DDP_COMPONENT_RDMA1,
> > DDP_COMPONENT_RDMA2,
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> > index a2ca90fc403c..41baf6653bfc 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> > @@ -146,6 +146,32 @@ static const enum mtk_ddp_comp_id mt2701_mtk_ddp_ext[] = {
> > DDP_COMPONENT_DPI0,
> > };
> >
> > +static const enum mtk_ddp_comp_id mt2712_mtk_ddp_main[] = {
> > + DDP_COMPONENT_OVL0,
> > + DDP_COMPONENT_COLOR0,
> > + DDP_COMPONENT_AAL,
> > + DDP_COMPONENT_OD,
> > + DDP_COMPONENT_RDMA0,
> > + DDP_COMPONENT_DPI0,
> > + DDP_COMPONENT_PWM0,
> > +};
> > +
> > +static const enum mtk_ddp_comp_id mt2712_mtk_ddp_ext[] = {
> > + DDP_COMPONENT_OVL1,
> > + DDP_COMPONENT_COLOR1,
> > + DDP_COMPONENT_AAL1,
> > + DDP_COMPONENT_OD1,
> > + DDP_COMPONENT_RDMA1,
> > + DDP_COMPONENT_DPI1,
> > + DDP_COMPONENT_PWM1,
> > +};
> > +
> > +static const enum mtk_ddp_comp_id mt2712_mtk_ddp_third[] = {
> > + DDP_COMPONENT_RDMA2,
> > + DDP_COMPONENT_DSI2,
> > + DDP_COMPONENT_PWM2,
> > +};
> > +
>
> It looks like that the path definition varies for each SoC. I think such
> definition should be passed from dts to prevent modify driver for each
> SoC. In [3], it define the partial connection in device tree, but I
> would like this to be more general. My idea is:
>
> 1. Each component has one or two endpoint in device tree. The first and
> the last has one, and the others has two.
> 2. Remove mtxxxx_mtk_ddp_main[] and mtxxxx_mtk_ddp_ext[], use multiple
> link list (One display path has one link list, two display path has two
> link list) to generate it by parsing device tree in mtk_drm_probe().
>
> [3] https://patchwork.kernel.org/patch/10397337/
>
In the future, we would commit other patch serial for this issue.
Moreover, in addition to using dts and link list to establish the ddp
path, we want to design a new mechanism to add/remove the component into
this ddp path for run time

> > static const enum mtk_ddp_comp_id mt8173_mtk_ddp_main[] = {
> > DDP_COMPONENT_OVL0,
> > DDP_COMPONENT_COLOR0,
> > @@ -173,6 +199,15 @@ static const struct mtk_mmsys_driver_data mt2701_mmsys_driver_data = {
> > .shadow_register = true,
> > };
> >
> > +static const struct mtk_mmsys_driver_data mt2712_mmsys_driver_data = {
> > + .main_path = mt2712_mtk_ddp_main,
> > + .main_len = ARRAY_SIZE(mt2712_mtk_ddp_main),
> > + .ext_path = mt2712_mtk_ddp_ext,
> > + .ext_len = ARRAY_SIZE(mt2712_mtk_ddp_ext),
> > + .third_path = mt2712_mtk_ddp_third,
> > + .third_len = ARRAY_SIZE(mt2712_mtk_ddp_third),
> > +};
> > +
> > static const struct mtk_mmsys_driver_data mt8173_mmsys_driver_data = {
> > .main_path = mt8173_mtk_ddp_main,
> > .main_len = ARRAY_SIZE(mt8173_mtk_ddp_main),
> > @@ -232,6 +267,11 @@ static int mtk_drm_kms_init(struct drm_device *drm)
> > if (ret < 0)
> > goto err_component_unbind;
> >
> > + ret = mtk_drm_crtc_create(drm, private->data->third_path,
> > + private->data->third_len);
> > + if (ret < 0)
> > + goto err_component_unbind;
> > +
> > /* Use OVL device for all DMA memory allocations */
> > np = private->comp_node[private->data->main_path[0]] ?:
> > private->comp_node[private->data->ext_path[0]];
> > @@ -372,8 +412,10 @@ static const struct of_device_id mtk_ddp_comp_dt_ids[] = {
> > { .compatible = "mediatek,mt8173-disp-ufoe", .data = (void *)MTK_DISP_UFOE },
> > { .compatible = "mediatek,mt2701-dsi", .data = (void *)MTK_DSI },
> > { .compatible = "mediatek,mt8173-dsi", .data = (void *)MTK_DSI },
> > + { .compatible = "mediatek,mt2712-dpi", .data = (void *)MTK_DPI },
>
> Move this modification to the patch which modify the dpi driver for
> mt2712.
ok
>
> > { .compatible = "mediatek,mt8173-dpi", .data = (void *)MTK_DPI },
> > { .compatible = "mediatek,mt2701-disp-mutex", .data = (void *)MTK_DISP_MUTEX },
> > + { .compatible = "mediatek,mt2712-disp-mutex", .data = (void *)MTK_DISP_MUTEX },
> > { .compatible = "mediatek,mt8173-disp-mutex", .data = (void *)MTK_DISP_MUTEX },
> > { .compatible = "mediatek,mt2701-disp-pwm", .data = (void *)MTK_DISP_BLS },
> > { .compatible = "mediatek,mt8173-disp-pwm", .data = (void *)MTK_DISP_PWM },
> > @@ -552,6 +594,8 @@ static SIMPLE_DEV_PM_OPS(mtk_drm_pm_ops, mtk_drm_sys_suspend,
> > static const struct of_device_id mtk_drm_of_ids[] = {
> > { .compatible = "mediatek,mt2701-mmsys",
> > .data = &mt2701_mmsys_driver_data},
> > + { .compatible = "mediatek,mt2712-mmsys",
> > + .data = &mt2712_mmsys_driver_data},
> > { .compatible = "mediatek,mt8173-mmsys",
> > .data = &mt8173_mmsys_driver_data},
> > { }
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> > index c3378c452c0a..e821342bc2d3 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> > @@ -17,8 +17,8 @@
> > #include <linux/io.h>
> > #include "mtk_drm_ddp_comp.h"
> >
> > -#define MAX_CRTC 2
> > -#define MAX_CONNECTOR 2
> > +#define MAX_CRTC 3
> > +#define MAX_CONNECTOR 3
> >
> > struct device;
> > struct device_node;
> > @@ -33,6 +33,9 @@ struct mtk_mmsys_driver_data {
> > unsigned int main_len;
> > const enum mtk_ddp_comp_id *ext_path;
> > unsigned int ext_len;
> > + enum mtk_ddp_comp_id *third_path;
> > + unsigned int third_len;
> > +
> > bool shadow_register;
> > };
> >
>
> Regards,
> CK
>

Regards,
Stu

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