Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Jacopo Mondi | 647 | 99.69% | 1 | 33.33% |
Laurent Pinchart | 1 | 0.15% | 1 | 33.33% |
Qinglang Miao | 1 | 0.15% | 1 | 33.33% |
Total | 649 | 3 |
// SPDX-License-Identifier: GPL-2.0+ /* * R-Car Display Unit Color Management Module * * Copyright (C) 2019 Jacopo Mondi <jacopo+renesas@jmondi.org> */ #include <linux/io.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <drm/drm_color_mgmt.h> #include "rcar_cmm.h" #define CM2_LUT_CTRL 0x0000 #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. * * 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 * this function is made, the CMM unit has to be enabled by calling * rcar_cmm_enable() first. * * 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, const struct rcar_cmm_config *config) { struct rcar_cmm *rcmm = platform_get_drvdata(pdev); /* Disable LUT if no table is provided. */ if (!config->lut.table) { if (rcmm->lut.enabled) { rcar_cmm_write(rcmm, CM2_LUT_CTRL, 0); rcmm->lut.enabled = false; } return 0; } /* Enable LUT and program the new gamma table values. */ if (!rcmm->lut.enabled) { rcar_cmm_write(rcmm, CM2_LUT_CTRL, CM2_LUT_CTRL_LUT_EN); rcmm->lut.enabled = true; } rcar_cmm_lut_write(rcmm, config->lut.table); return 0; } EXPORT_SYMBOL_GPL(rcar_cmm_setup); /* * rcar_cmm_enable() - Enable the CMM unit * @pdev: The platform device associated with the CMM instance * * When the output of the corresponding DU channel is routed to the CMM unit, * the unit shall be enabled before the DU channel is started, and remain * enabled until the channel is stopped. The CMM unit shall be disabled with * rcar_cmm_disable(). * * Calls to rcar_cmm_enable() and rcar_cmm_disable() are not reference-counted. * It is an error to attempt to enable an already enabled CMM unit, or to * attempt to disable a disabled unit. */ int rcar_cmm_enable(struct platform_device *pdev) { int ret; ret = pm_runtime_resume_and_get(&pdev->dev); if (ret < 0) return ret; return 0; } EXPORT_SYMBOL_GPL(rcar_cmm_enable); /* * rcar_cmm_disable() - Disable the CMM unit * @pdev: The platform device associated with the CMM instance * * See rcar_cmm_enable() for usage information. * * Disabling the CMM unit disable all the internal processing blocks. The CMM * state shall thus be restored with rcar_cmm_setup() when re-enabling the CMM * unit after the next rcar_cmm_enable() call. */ void rcar_cmm_disable(struct platform_device *pdev) { struct rcar_cmm *rcmm = platform_get_drvdata(pdev); rcar_cmm_write(rcmm, CM2_LUT_CTRL, 0); rcmm->lut.enabled = false; pm_runtime_put(&pdev->dev); } EXPORT_SYMBOL_GPL(rcar_cmm_disable); /* * rcar_cmm_init() - Initialize the CMM unit * @pdev: The platform device associated with the CMM instance * * Return: 0 on success, -EPROBE_DEFER if the CMM is not available yet, * -ENODEV if the DRM_RCAR_CMM config option is disabled */ int rcar_cmm_init(struct platform_device *pdev) { struct rcar_cmm *rcmm = platform_get_drvdata(pdev); if (!rcmm) return -EPROBE_DEFER; return 0; } EXPORT_SYMBOL_GPL(rcar_cmm_init); static int rcar_cmm_probe(struct platform_device *pdev) { struct rcar_cmm *rcmm; rcmm = devm_kzalloc(&pdev->dev, sizeof(*rcmm), GFP_KERNEL); if (!rcmm) return -ENOMEM; platform_set_drvdata(pdev, rcmm); rcmm->base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(rcmm->base)) return PTR_ERR(rcmm->base); pm_runtime_enable(&pdev->dev); return 0; } static int rcar_cmm_remove(struct platform_device *pdev) { pm_runtime_disable(&pdev->dev); return 0; } static const struct of_device_id rcar_cmm_of_table[] = { { .compatible = "renesas,rcar-gen3-cmm", }, { .compatible = "renesas,rcar-gen2-cmm", }, { }, }; MODULE_DEVICE_TABLE(of, rcar_cmm_of_table); static struct platform_driver rcar_cmm_platform_driver = { .probe = rcar_cmm_probe, .remove = rcar_cmm_remove, .driver = { .name = "rcar-cmm", .of_match_table = rcar_cmm_of_table, }, }; module_platform_driver(rcar_cmm_platform_driver); MODULE_AUTHOR("Jacopo Mondi <jacopo+renesas@jmondi.org>"); MODULE_DESCRIPTION("Renesas R-Car CMM Driver"); MODULE_LICENSE("GPL v2");
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with Cregit http://github.com/cregit/cregit
Version 2.0-RC1