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>
Reviewed-by: Kieran Bingham <kieran.bingham+rene...@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo.mo...@ideasonboard.com>
---
drivers/gpu/drm/rcar-du/rcar_cmm.c | 71 +++++++++++++++++++++++++++++-
drivers/gpu/drm/rcar-du/rcar_cmm.h | 11 +++--
2 files changed, 76 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/rcar-du/rcar_cmm.c
b/drivers/gpu/drm/rcar-du/rcar_cmm.c
index df768a9afb72..defedfaf8f56 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(0)
+#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 +85,63 @@ static void rcar_cmm_lut_configure(struct rcar_cmm *rcmm,
}
}
+static void rcar_cmm_clu_program(struct rcar_cmm *rcmm,
+ const struct drm_color_lut *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);
+ }
+}
+
+static void rcar_cmm_clu_configure(struct rcar_cmm *rcmm,
+ const struct drm_color_lut *table)
+{
+ static const u32 clu_ctrl = CM2_CLU_CTRL_AAI | CM2_CLU_CTRL_MVS
+ | CM2_CLU_CTRL_CLU_EN;
+ bool enable = !!table;
+
+ if (rcmm->clu.enabled != enable) {
+ /*
+ * This is the first run of the CLU. We need to program
+ * the CLU data before enabling the peripheral.
+ */
+ if (enable) {
+ rcar_cmm_write(rcmm, CM2_CLU_CTRL, CM2_CLU_CTRL_AAI);
+ rcar_cmm_clu_program(rcmm, table);
+ }
+
+ rcar_cmm_write(rcmm, CM2_CLU_CTRL, enable ? clu_ctrl : 0);
+ rcmm->clu.enabled = enable;
+
+ return;
+ }
+
+ /*
+ * CLU already enabled, but the 3D LUT has been updated; re-program
+ * the data table with the new values.
+ */
+ if (table)
+ rcar_cmm_clu_program(rcmm, table);
+}
+
/*
* 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 +159,9 @@ 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 +206,7 @@ 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 375a3b9c3db3..277b9e4d9cc4 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)
--
2.40.1
