Re: [PATCH v6 3/8] drm: rcar-du: Add support for CMM
Hi Jacopo,
On Thu, Oct 17, 2019 at 02:43:49PM +0200, Jacopo Mondi wrote:
> On Wed, Oct 16, 2019 at 04:45:26PM +0300, Laurent Pinchart wrote:
> > On Wed, Oct 16, 2019 at 10:55:43AM +0200, Jacopo Mondi wrote:
> > > Add a driver for the R-Car Display Unit Color Correction Module.
> > >
> > > In most of Gen3 SoCs, each DU output channel is provided with a CMM unit
> > > to perform image enhancement and color correction.
> > >
> > > Add support for CMM through a driver that supports configuration of
> > > the 1-dimensional LUT table. More advanced CMM features will be
> > > implemented on top of this initial one.
> > >
> > > Reviewed-by: Laurent Pinchart
> > > Reviewed-by: Kieran Bingham
> > > Signed-off-by: Jacopo Mondi
> > > ---
> > > drivers/gpu/drm/rcar-du/Kconfig| 7 +
> > > drivers/gpu/drm/rcar-du/Makefile | 1 +
> > > drivers/gpu/drm/rcar-du/rcar_cmm.c | 212 +
> > > drivers/gpu/drm/rcar-du/rcar_cmm.h | 58
> > > 4 files changed, 278 insertions(+)
> > > create mode 100644 drivers/gpu/drm/rcar-du/rcar_cmm.c
> > > create mode 100644 drivers/gpu/drm/rcar-du/rcar_cmm.h
> > >
> > > diff --git a/drivers/gpu/drm/rcar-du/Kconfig
> > > b/drivers/gpu/drm/rcar-du/Kconfig
> > > index 1529849e217e..539d232790d1 100644
> > > --- a/drivers/gpu/drm/rcar-du/Kconfig
> > > +++ b/drivers/gpu/drm/rcar-du/Kconfig
> > > @@ -13,6 +13,13 @@ config DRM_RCAR_DU
> > > Choose this option if you have an R-Car chipset.
> > > If M is selected the module will be called rcar-du-drm.
> > >
> > > +config DRM_RCAR_CMM
> > > + bool "R-Car DU Color Management Module (CMM) Support"
> > > + depends on DRM && OF
> > > + depends on DRM_RCAR_DU
> > > + help
> > > + Enable support for R-Car Color Management Module (CMM).
> > > +
> > > config DRM_RCAR_DW_HDMI
> > > tristate "R-Car DU Gen3 HDMI Encoder Support"
> > > depends on DRM && OF
> > > diff --git a/drivers/gpu/drm/rcar-du/Makefile
> > > b/drivers/gpu/drm/rcar-du/Makefile
> > > index 6c2ed9c46467..4d1187ccc3e5 100644
> > > --- a/drivers/gpu/drm/rcar-du/Makefile
> > > +++ b/drivers/gpu/drm/rcar-du/Makefile
> > > @@ -15,6 +15,7 @@ rcar-du-drm-$(CONFIG_DRM_RCAR_LVDS) += rcar_du_of.o
> > > \
> > > rcar-du-drm-$(CONFIG_DRM_RCAR_VSP) += rcar_du_vsp.o
> > > rcar-du-drm-$(CONFIG_DRM_RCAR_WRITEBACK) += rcar_du_writeback.o
> > >
> > > +obj-$(CONFIG_DRM_RCAR_CMM) += rcar_cmm.o
> > > obj-$(CONFIG_DRM_RCAR_DU)+= rcar-du-drm.o
> > > obj-$(CONFIG_DRM_RCAR_DW_HDMI) += rcar_dw_hdmi.o
> > > obj-$(CONFIG_DRM_RCAR_LVDS) += rcar_lvds.o
> > > diff --git a/drivers/gpu/drm/rcar-du/rcar_cmm.c
> > > b/drivers/gpu/drm/rcar-du/rcar_cmm.c
> > > new file mode 100644
> > > index ..4170626208cf
> > > --- /dev/null
> > > +++ b/drivers/gpu/drm/rcar-du/rcar_cmm.c
> > > @@ -0,0 +1,212 @@
> > > +// SPDX-License-Identifier: GPL-2.0+
> > > +/*
> > > + * rcar_cmm.c -- R-Car Display Unit Color Management Module
> > > + *
> > > + * Copyright (C) 2019 Jacopo Mondi
> > > + */
> > > +
> > > +#include
> > > +#include
> > > +#include
> > > +#include
> > > +#include
> > > +
> > > +#include
> > > +
> > > +#include "rcar_cmm.h"
> > > +
> > > +#define CM2_LUT_CTRL 0x
> > > +#define CM2_LUT_CTRL_LUT_EN BIT(0)
> > > +#define CM2_LUT_TBL_BASE 0x0600
> > > +#define CM2_LUT_TBL(__i) (CM2_LUT_TBL_BASE + (__i) * 4)
> > > +
> > > +struct rcar_cmm {
> > > + void __iomem *base;
> > > +
> > > + /*
> > > + * @lut:1D-LUT state
> > > + * @lut.enabled:1D-LUT enabled flag
> > > + */
> > > + struct {
> > > + bool enabled;
> > > + } lut;
> > > +};
> > > +
> > > +static inline int rcar_cmm_read(struct rcar_cmm *rcmm, u32 reg)
> > > +{
> > > + return ioread32(rcmm->base + reg);
> > > +}
> > > +
> > > +static inline void rcar_cmm_write(struct rcar_cmm *rcmm, u32 reg, u32
> > > data)
> > > +{
> > > + iowrite32(data, rcmm->base + reg);
> > > +}
> > > +
> > > +/*
> > > + * rcar_cmm_lut_write() - Scale the DRM LUT table entries to hardware
> > > precision
> > > + * and write to the CMM registers
> > > + * @rcmm: Pointer to the CMM device
> > > + * @drm_lut: Pointer to the DRM LUT table
> > > + */
> > > +static void rcar_cmm_lut_write(struct rcar_cmm *rcmm,
> > > +const struct drm_color_lut *drm_lut)
> > > +{
> > > + unsigned int i;
> > > +
> > > + for (i = 0; i < CM2_LUT_SIZE; ++i) {
> > > + u32 entry = drm_color_lut_extract(drm_lut[i].red, 8) << 16
> > > + | drm_color_lut_extract(drm_lut[i].green, 8) << 8
> > > + | drm_color_lut_extract(drm_lut[i].blue, 8);
> > > +
> > > + rcar_cmm_write(rcmm, CM2_LUT_TBL(i), entry);
> > > + }
> > > +}
> > > +
> > > +/*
> > > + * rcar_cmm_setup() - Configure the CMM unit
> > > + * @pdev: The platform device associated with the CMM instance
> > > + * @config: The CMM unit configuration
> > > + *
> > > + * Configure the
Re: [PATCH v6 3/8] drm: rcar-du: Add support for CMM
Hi Laurent,
On Wed, Oct 16, 2019 at 04:45:26PM +0300, Laurent Pinchart wrote:
> Hi Jacopo,
>
> Thank you for the patch.
>
> On Wed, Oct 16, 2019 at 10:55:43AM +0200, Jacopo Mondi wrote:
> > Add a driver for the R-Car Display Unit Color Correction Module.
> >
> > In most of Gen3 SoCs, each DU output channel is provided with a CMM unit
> > to perform image enhancement and color correction.
> >
> > Add support for CMM through a driver that supports configuration of
> > the 1-dimensional LUT table. More advanced CMM features will be
> > implemented on top of this initial one.
> >
> > Reviewed-by: Laurent Pinchart
> > Reviewed-by: Kieran Bingham
> > Signed-off-by: Jacopo Mondi
> > ---
> > drivers/gpu/drm/rcar-du/Kconfig| 7 +
> > drivers/gpu/drm/rcar-du/Makefile | 1 +
> > drivers/gpu/drm/rcar-du/rcar_cmm.c | 212 +
> > drivers/gpu/drm/rcar-du/rcar_cmm.h | 58
> > 4 files changed, 278 insertions(+)
> > create mode 100644 drivers/gpu/drm/rcar-du/rcar_cmm.c
> > create mode 100644 drivers/gpu/drm/rcar-du/rcar_cmm.h
> >
> > diff --git a/drivers/gpu/drm/rcar-du/Kconfig
> > b/drivers/gpu/drm/rcar-du/Kconfig
> > index 1529849e217e..539d232790d1 100644
> > --- a/drivers/gpu/drm/rcar-du/Kconfig
> > +++ b/drivers/gpu/drm/rcar-du/Kconfig
> > @@ -13,6 +13,13 @@ config DRM_RCAR_DU
> > Choose this option if you have an R-Car chipset.
> > If M is selected the module will be called rcar-du-drm.
> >
> > +config DRM_RCAR_CMM
> > + bool "R-Car DU Color Management Module (CMM) Support"
> > + depends on DRM && OF
> > + depends on DRM_RCAR_DU
> > + help
> > + Enable support for R-Car Color Management Module (CMM).
> > +
> > config DRM_RCAR_DW_HDMI
> > tristate "R-Car DU Gen3 HDMI Encoder Support"
> > depends on DRM && OF
> > diff --git a/drivers/gpu/drm/rcar-du/Makefile
> > b/drivers/gpu/drm/rcar-du/Makefile
> > index 6c2ed9c46467..4d1187ccc3e5 100644
> > --- a/drivers/gpu/drm/rcar-du/Makefile
> > +++ b/drivers/gpu/drm/rcar-du/Makefile
> > @@ -15,6 +15,7 @@ rcar-du-drm-$(CONFIG_DRM_RCAR_LVDS) += rcar_du_of.o
> > \
> > rcar-du-drm-$(CONFIG_DRM_RCAR_VSP) += rcar_du_vsp.o
> > rcar-du-drm-$(CONFIG_DRM_RCAR_WRITEBACK) += rcar_du_writeback.o
> >
> > +obj-$(CONFIG_DRM_RCAR_CMM) += rcar_cmm.o
> > obj-$(CONFIG_DRM_RCAR_DU) += rcar-du-drm.o
> > obj-$(CONFIG_DRM_RCAR_DW_HDMI) += rcar_dw_hdmi.o
> > obj-$(CONFIG_DRM_RCAR_LVDS)+= rcar_lvds.o
> > diff --git a/drivers/gpu/drm/rcar-du/rcar_cmm.c
> > b/drivers/gpu/drm/rcar-du/rcar_cmm.c
> > new file mode 100644
> > index ..4170626208cf
> > --- /dev/null
> > +++ b/drivers/gpu/drm/rcar-du/rcar_cmm.c
> > @@ -0,0 +1,212 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * rcar_cmm.c -- R-Car Display Unit Color Management Module
> > + *
> > + * Copyright (C) 2019 Jacopo Mondi
> > + */
> > +
> > +#include
> > +#include
> > +#include
> > +#include
> > +#include
> > +
> > +#include
> > +
> > +#include "rcar_cmm.h"
> > +
> > +#define CM2_LUT_CTRL 0x
> > +#define CM2_LUT_CTRL_LUT_ENBIT(0)
> > +#define CM2_LUT_TBL_BASE 0x0600
> > +#define CM2_LUT_TBL(__i) (CM2_LUT_TBL_BASE + (__i) * 4)
> > +
> > +struct rcar_cmm {
> > + void __iomem *base;
> > +
> > + /*
> > +* @lut:1D-LUT state
> > +* @lut.enabled:1D-LUT enabled flag
> > +*/
> > + struct {
> > + bool enabled;
> > + } lut;
> > +};
> > +
> > +static inline int rcar_cmm_read(struct rcar_cmm *rcmm, u32 reg)
> > +{
> > + return ioread32(rcmm->base + reg);
> > +}
> > +
> > +static inline void rcar_cmm_write(struct rcar_cmm *rcmm, u32 reg, u32 data)
> > +{
> > + iowrite32(data, rcmm->base + reg);
> > +}
> > +
> > +/*
> > + * rcar_cmm_lut_write() - Scale the DRM LUT table entries to hardware
> > precision
> > + * and write to the CMM registers
> > + * @rcmm: Pointer to the CMM device
> > + * @drm_lut: Pointer to the DRM LUT table
> > + */
> > +static void rcar_cmm_lut_write(struct rcar_cmm *rcmm,
> > + const struct drm_color_lut *drm_lut)
> > +{
> > + unsigned int i;
> > +
> > + for (i = 0; i < CM2_LUT_SIZE; ++i) {
> > + u32 entry = drm_color_lut_extract(drm_lut[i].red, 8) << 16
> > + | drm_color_lut_extract(drm_lut[i].green, 8) << 8
> > + | drm_color_lut_extract(drm_lut[i].blue, 8);
> > +
> > + rcar_cmm_write(rcmm, CM2_LUT_TBL(i), entry);
> > + }
> > +}
> > +
> > +/*
> > + * rcar_cmm_setup() - Configure the CMM unit
> > + * @pdev: The platform device associated with the CMM instance
> > + * @config: The CMM unit configuration
> > + *
> > + * Configure the CMM unit with the given configuration. Currently enabling,
> > + * disabling and programming of the 1-D LUT unit is supported.
>
> Did you miss the comment in the previous version about explaining when
> rcar_cmm_setup() can be called (basically
Re: [PATCH v6 3/8] drm: rcar-du: Add support for CMM
Hi Jacopo,
Thank you for the patch.
On Wed, Oct 16, 2019 at 10:55:43AM +0200, Jacopo Mondi wrote:
> Add a driver for the R-Car Display Unit Color Correction Module.
>
> In most of Gen3 SoCs, each DU output channel is provided with a CMM unit
> to perform image enhancement and color correction.
>
> Add support for CMM through a driver that supports configuration of
> the 1-dimensional LUT table. More advanced CMM features will be
> implemented on top of this initial one.
>
> Reviewed-by: Laurent Pinchart
> Reviewed-by: Kieran Bingham
> Signed-off-by: Jacopo Mondi
> ---
> drivers/gpu/drm/rcar-du/Kconfig| 7 +
> drivers/gpu/drm/rcar-du/Makefile | 1 +
> drivers/gpu/drm/rcar-du/rcar_cmm.c | 212 +
> drivers/gpu/drm/rcar-du/rcar_cmm.h | 58
> 4 files changed, 278 insertions(+)
> create mode 100644 drivers/gpu/drm/rcar-du/rcar_cmm.c
> create mode 100644 drivers/gpu/drm/rcar-du/rcar_cmm.h
>
> diff --git a/drivers/gpu/drm/rcar-du/Kconfig b/drivers/gpu/drm/rcar-du/Kconfig
> index 1529849e217e..539d232790d1 100644
> --- a/drivers/gpu/drm/rcar-du/Kconfig
> +++ b/drivers/gpu/drm/rcar-du/Kconfig
> @@ -13,6 +13,13 @@ config DRM_RCAR_DU
> Choose this option if you have an R-Car chipset.
> If M is selected the module will be called rcar-du-drm.
>
> +config DRM_RCAR_CMM
> + bool "R-Car DU Color Management Module (CMM) Support"
> + depends on DRM && OF
> + depends on DRM_RCAR_DU
> + help
> + Enable support for R-Car Color Management Module (CMM).
> +
> config DRM_RCAR_DW_HDMI
> tristate "R-Car DU Gen3 HDMI Encoder Support"
> depends on DRM && OF
> diff --git a/drivers/gpu/drm/rcar-du/Makefile
> b/drivers/gpu/drm/rcar-du/Makefile
> index 6c2ed9c46467..4d1187ccc3e5 100644
> --- a/drivers/gpu/drm/rcar-du/Makefile
> +++ b/drivers/gpu/drm/rcar-du/Makefile
> @@ -15,6 +15,7 @@ rcar-du-drm-$(CONFIG_DRM_RCAR_LVDS) += rcar_du_of.o \
> rcar-du-drm-$(CONFIG_DRM_RCAR_VSP) += rcar_du_vsp.o
> rcar-du-drm-$(CONFIG_DRM_RCAR_WRITEBACK) += rcar_du_writeback.o
>
> +obj-$(CONFIG_DRM_RCAR_CMM) += rcar_cmm.o
> obj-$(CONFIG_DRM_RCAR_DU)+= rcar-du-drm.o
> obj-$(CONFIG_DRM_RCAR_DW_HDMI) += rcar_dw_hdmi.o
> obj-$(CONFIG_DRM_RCAR_LVDS) += rcar_lvds.o
> diff --git a/drivers/gpu/drm/rcar-du/rcar_cmm.c
> b/drivers/gpu/drm/rcar-du/rcar_cmm.c
> new file mode 100644
> index ..4170626208cf
> --- /dev/null
> +++ b/drivers/gpu/drm/rcar-du/rcar_cmm.c
> @@ -0,0 +1,212 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * rcar_cmm.c -- R-Car Display Unit Color Management Module
> + *
> + * Copyright (C) 2019 Jacopo Mondi
> + */
> +
> +#include
> +#include
> +#include
> +#include
> +#include
> +
> +#include
> +
> +#include "rcar_cmm.h"
> +
> +#define CM2_LUT_CTRL 0x
> +#define CM2_LUT_CTRL_LUT_EN BIT(0)
> +#define CM2_LUT_TBL_BASE 0x0600
> +#define CM2_LUT_TBL(__i) (CM2_LUT_TBL_BASE + (__i) * 4)
> +
> +struct rcar_cmm {
> + void __iomem *base;
> +
> + /*
> + * @lut:1D-LUT state
> + * @lut.enabled:1D-LUT enabled flag
> + */
> + struct {
> + bool enabled;
> + } lut;
> +};
> +
> +static inline int rcar_cmm_read(struct rcar_cmm *rcmm, u32 reg)
> +{
> + return ioread32(rcmm->base + reg);
> +}
> +
> +static inline void rcar_cmm_write(struct rcar_cmm *rcmm, u32 reg, u32 data)
> +{
> + iowrite32(data, rcmm->base + reg);
> +}
> +
> +/*
> + * rcar_cmm_lut_write() - Scale the DRM LUT table entries to hardware
> precision
> + * and write to the CMM registers
> + * @rcmm: Pointer to the CMM device
> + * @drm_lut: Pointer to the DRM LUT table
> + */
> +static void rcar_cmm_lut_write(struct rcar_cmm *rcmm,
> +const struct drm_color_lut *drm_lut)
> +{
> + unsigned int i;
> +
> + for (i = 0; i < CM2_LUT_SIZE; ++i) {
> + u32 entry = drm_color_lut_extract(drm_lut[i].red, 8) << 16
> + | drm_color_lut_extract(drm_lut[i].green, 8) << 8
> + | drm_color_lut_extract(drm_lut[i].blue, 8);
> +
> + rcar_cmm_write(rcmm, CM2_LUT_TBL(i), entry);
> + }
> +}
> +
> +/*
> + * rcar_cmm_setup() - Configure the CMM unit
> + * @pdev: The platform device associated with the CMM instance
> + * @config: The CMM unit configuration
> + *
> + * Configure the CMM unit with the given configuration. Currently enabling,
> + * disabling and programming of the 1-D LUT unit is supported.
Did you miss the comment in the previous version about explaining when
rcar_cmm_setup() can be called (basically requiring the CMM to be
enabled) ? I can fix this when applying if you tell me what I should
write.
> + *
> + * TODO: Add support for LUT double buffer operations to avoid updating the
> + * LUT table entries while a frame is being displayed.
> + */
> +int rcar_cmm_setup(struct platform_device *pdev,
> +
