Hi Laurent,
On 21/12/2020 01:57, Laurent Pinchart wrote:
> From: Kieran Bingham <kieran.bingham+rene...@ideasonboard.com>
>
> The CMM module provides a three-dimensional cubic look up table that
> converts three-color-component data into desired three color components
> by use of a lookup table.
>
> While the 1D-LUT can only control each of three color components
> separately, the 3D-CLU can be used for specific color adjustment.
>
> Signed-off-by: Kieran Bingham <kieran.bingham+rene...@ideasonboard.com>
> Signed-off-by: Laurent Pinchart <laurent.pinchart+rene...@ideasonboard.com>
For the updates since I wrote the patch:
Reviewed-by: Kieran Bingham <kieran.bingham+rene...@ideasonboard.com>
> ---
> drivers/gpu/drm/rcar-du/rcar_cmm.c | 52 ++++++++++++++++++++++++++++--
> drivers/gpu/drm/rcar-du/rcar_cmm.h | 11 ++++---
> 2 files changed, 57 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/rcar-du/rcar_cmm.c
> b/drivers/gpu/drm/rcar-du/rcar_cmm.c
> index ccc8c8b03bac..9a20728a3534 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_cmm.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_cmm.c
> @@ -17,9 +17,18 @@
>
> #define CM2_LUT_CTRL 0x0000
> #define CM2_LUT_CTRL_LUT_EN BIT(0)
> +
> +#define CM2_CLU_CTRL 0x0100
> +#define CM2_CLU_CTRL_CLU_EN BIT(1)
> +#define CM2_CLU_CTRL_MVS BIT(24)
> +#define CM2_CLU_CTRL_AAI BIT(28)
> +
> #define CM2_LUT_TBL_BASE 0x0600
> #define CM2_LUT_TBL(__i) (CM2_LUT_TBL_BASE + (__i) * 4)
>
> +#define CM2_CLU_ADDR 0x0a00
> +#define CM2_CLU_DATA 0x0a04
> +
> struct rcar_cmm {
> void __iomem *base;
>
> @@ -30,6 +39,10 @@ struct rcar_cmm {
> struct {
> bool enabled;
> } lut;
> +
> + struct {
> + bool enabled;
> + } clu;
> };
>
> static inline int rcar_cmm_read(struct rcar_cmm *rcmm, u32 reg)
> @@ -72,13 +85,44 @@ static void rcar_cmm_lut_configure(struct rcar_cmm *rcmm,
> }
> }
>
> +static void rcar_cmm_clu_configure(struct rcar_cmm *rcmm,
> + const struct drm_color_lut *table)
> +{
> + static const u32 cfg = CM2_CLU_CTRL_AAI
> + | CM2_CLU_CTRL_MVS
> + | CM2_CLU_CTRL_CLU_EN;
> + bool enable = !!table;
Good, not sure why I was calculating this outside of the call.
> +
> + if (rcmm->clu.enabled != enable) {
> + rcar_cmm_write(rcmm, CM2_CLU_CTRL, enable ? cfg : 0);
> + rcmm->clu.enabled = enable;
> + }
> +
> + if (table) {
> + unsigned int i;
> +
> + /* Utilise CM2_CLU_CTRL_AAI (auto-increment). */
> + rcar_cmm_write(rcmm, CM2_CLU_ADDR, 0);
> +
> + for (i = 0; i < CM2_CLU_SIZE; ++i) {
> + const struct drm_color_lut *lut = &table[i];
> +
> + u32 entry = drm_color_lut_extract(lut->red, 8) << 16
> + | drm_color_lut_extract(lut->green, 8) << 8
> + | drm_color_lut_extract(lut->blue, 8);
> +
> + rcar_cmm_write(rcmm, CM2_CLU_DATA, 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.
> + * Configure the CMM unit with the given configuration, handling both the
> + * 1-D LUT and the 3-D CLU.
> *
> * As rcar_cmm_setup() accesses the CMM registers the unit should be powered
> * and its functional clock enabled. To guarantee this, before any call to
> @@ -96,6 +140,9 @@ int rcar_cmm_setup(struct platform_device *pdev,
> if (config->lut.update)
> rcar_cmm_lut_configure(rcmm, config->lut.table);
>
> + if (config->clu.update)
> + rcar_cmm_clu_configure(rcmm, config->clu.table);
> +
> return 0;
> }
> EXPORT_SYMBOL_GPL(rcar_cmm_setup);
> @@ -140,6 +187,7 @@ void rcar_cmm_disable(struct platform_device *pdev)
> struct rcar_cmm *rcmm = platform_get_drvdata(pdev);
>
> rcar_cmm_lut_configure(rcmm, NULL);
> + rcar_cmm_clu_configure(rcmm, NULL);
>
> pm_runtime_put(&pdev->dev);
> }
> diff --git a/drivers/gpu/drm/rcar-du/rcar_cmm.h
> b/drivers/gpu/drm/rcar-du/rcar_cmm.h
> index f4b16535ec16..35f901158cec 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_cmm.h
> +++ b/drivers/gpu/drm/rcar-du/rcar_cmm.h
> @@ -9,14 +9,15 @@
> #define __RCAR_CMM_H__
>
> #define CM2_LUT_SIZE 256
> +#define CM2_CLU_SIZE (17 * 17 * 17)
>
> struct drm_color_lut;
> struct platform_device;
>
> /**
> - * struct rcar_cmm_table_config - CMM LUT configuration
> - * @update: When true, update the LUT configuration.
> - * @table: Table data. The LUT is enabled if non-NULL, and disabled
> + * struct rcar_cmm_table_config - CMM LUT and CLU configuration
> + * @update: When true, update the LUT or CLU configuration.
> + * @table: Table data. The LUT or CLU is enabled if non-NULL, and disabled
> * otherwise. The value is ignored if @update is false.
> */
> struct rcar_cmm_table_config {
> @@ -26,10 +27,12 @@ struct rcar_cmm_table_config {
>
> /**
> * struct rcar_cmm_config - CMM configuration
> - * @lut: 1D-LUT configuration
> + * @lut: 1D LUT configuration
> + * @clu: 3D (cubic) LUT configuration
> */
> struct rcar_cmm_config {
> struct rcar_cmm_table_config lut;
> + struct rcar_cmm_table_config clu;
> };
>
> #if IS_ENABLED(CONFIG_DRM_RCAR_CMM)
>
--
Regards
--
Kieran
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