From: Kieran Bingham kieran.bingham+renesas@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+renesas@ideasonboard.com Signed-off-by: Laurent Pinchart laurent.pinchart+renesas@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; + + 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)