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217 lines
5.5 KiB
217 lines
5.5 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* rcar_cmm.c -- R-Car Display Unit Color Management Module |
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* |
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* Copyright (C) 2019 Jacopo Mondi <[email protected]> |
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*/ |
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#include <linux/io.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm_runtime.h> |
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#include <drm/drm_color_mgmt.h> |
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#include "rcar_cmm.h" |
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#define CM2_LUT_CTRL 0x0000 |
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#define CM2_LUT_CTRL_LUT_EN BIT(0) |
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#define CM2_LUT_TBL_BASE 0x0600 |
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#define CM2_LUT_TBL(__i) (CM2_LUT_TBL_BASE + (__i) * 4) |
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struct rcar_cmm { |
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void __iomem *base; |
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/* |
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* @lut: 1D-LUT state |
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* @lut.enabled: 1D-LUT enabled flag |
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*/ |
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struct { |
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bool enabled; |
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} lut; |
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}; |
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static inline int rcar_cmm_read(struct rcar_cmm *rcmm, u32 reg) |
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{ |
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return ioread32(rcmm->base + reg); |
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} |
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static inline void rcar_cmm_write(struct rcar_cmm *rcmm, u32 reg, u32 data) |
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{ |
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iowrite32(data, rcmm->base + reg); |
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} |
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/* |
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* rcar_cmm_lut_write() - Scale the DRM LUT table entries to hardware precision |
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* and write to the CMM registers |
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* @rcmm: Pointer to the CMM device |
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* @drm_lut: Pointer to the DRM LUT table |
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*/ |
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static void rcar_cmm_lut_write(struct rcar_cmm *rcmm, |
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const struct drm_color_lut *drm_lut) |
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{ |
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unsigned int i; |
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for (i = 0; i < CM2_LUT_SIZE; ++i) { |
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u32 entry = drm_color_lut_extract(drm_lut[i].red, 8) << 16 |
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| drm_color_lut_extract(drm_lut[i].green, 8) << 8 |
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| drm_color_lut_extract(drm_lut[i].blue, 8); |
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rcar_cmm_write(rcmm, CM2_LUT_TBL(i), entry); |
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} |
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} |
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/* |
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* rcar_cmm_setup() - Configure the CMM unit |
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* @pdev: The platform device associated with the CMM instance |
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* @config: The CMM unit configuration |
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* |
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* Configure the CMM unit with the given configuration. Currently enabling, |
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* disabling and programming of the 1-D LUT unit is supported. |
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* |
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* As rcar_cmm_setup() accesses the CMM registers the unit should be powered |
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* and its functional clock enabled. To guarantee this, before any call to |
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* this function is made, the CMM unit has to be enabled by calling |
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* rcar_cmm_enable() first. |
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* |
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* TODO: Add support for LUT double buffer operations to avoid updating the |
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* LUT table entries while a frame is being displayed. |
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*/ |
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int rcar_cmm_setup(struct platform_device *pdev, |
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const struct rcar_cmm_config *config) |
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{ |
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struct rcar_cmm *rcmm = platform_get_drvdata(pdev); |
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/* Disable LUT if no table is provided. */ |
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if (!config->lut.table) { |
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if (rcmm->lut.enabled) { |
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rcar_cmm_write(rcmm, CM2_LUT_CTRL, 0); |
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rcmm->lut.enabled = false; |
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} |
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return 0; |
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} |
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/* Enable LUT and program the new gamma table values. */ |
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if (!rcmm->lut.enabled) { |
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rcar_cmm_write(rcmm, CM2_LUT_CTRL, CM2_LUT_CTRL_LUT_EN); |
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rcmm->lut.enabled = true; |
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} |
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rcar_cmm_lut_write(rcmm, config->lut.table); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(rcar_cmm_setup); |
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/* |
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* rcar_cmm_enable() - Enable the CMM unit |
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* @pdev: The platform device associated with the CMM instance |
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* |
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* When the output of the corresponding DU channel is routed to the CMM unit, |
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* the unit shall be enabled before the DU channel is started, and remain |
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* enabled until the channel is stopped. The CMM unit shall be disabled with |
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* rcar_cmm_disable(). |
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* |
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* Calls to rcar_cmm_enable() and rcar_cmm_disable() are not reference-counted. |
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* It is an error to attempt to enable an already enabled CMM unit, or to |
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* attempt to disable a disabled unit. |
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*/ |
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int rcar_cmm_enable(struct platform_device *pdev) |
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{ |
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int ret; |
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ret = pm_runtime_resume_and_get(&pdev->dev); |
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if (ret < 0) |
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return ret; |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(rcar_cmm_enable); |
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/* |
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* rcar_cmm_disable() - Disable the CMM unit |
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* @pdev: The platform device associated with the CMM instance |
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* |
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* See rcar_cmm_enable() for usage information. |
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* |
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* Disabling the CMM unit disable all the internal processing blocks. The CMM |
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* state shall thus be restored with rcar_cmm_setup() when re-enabling the CMM |
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* unit after the next rcar_cmm_enable() call. |
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*/ |
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void rcar_cmm_disable(struct platform_device *pdev) |
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{ |
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struct rcar_cmm *rcmm = platform_get_drvdata(pdev); |
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rcar_cmm_write(rcmm, CM2_LUT_CTRL, 0); |
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rcmm->lut.enabled = false; |
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pm_runtime_put(&pdev->dev); |
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} |
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EXPORT_SYMBOL_GPL(rcar_cmm_disable); |
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/* |
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* rcar_cmm_init() - Initialize the CMM unit |
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* @pdev: The platform device associated with the CMM instance |
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* |
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* Return: 0 on success, -EPROBE_DEFER if the CMM is not available yet, |
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* -ENODEV if the DRM_RCAR_CMM config option is disabled |
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*/ |
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int rcar_cmm_init(struct platform_device *pdev) |
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{ |
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struct rcar_cmm *rcmm = platform_get_drvdata(pdev); |
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if (!rcmm) |
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return -EPROBE_DEFER; |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(rcar_cmm_init); |
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static int rcar_cmm_probe(struct platform_device *pdev) |
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{ |
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struct rcar_cmm *rcmm; |
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rcmm = devm_kzalloc(&pdev->dev, sizeof(*rcmm), GFP_KERNEL); |
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if (!rcmm) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, rcmm); |
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rcmm->base = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(rcmm->base)) |
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return PTR_ERR(rcmm->base); |
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pm_runtime_enable(&pdev->dev); |
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return 0; |
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} |
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static int rcar_cmm_remove(struct platform_device *pdev) |
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{ |
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pm_runtime_disable(&pdev->dev); |
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return 0; |
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} |
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static const struct of_device_id rcar_cmm_of_table[] = { |
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{ .compatible = "renesas,rcar-gen3-cmm", }, |
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{ .compatible = "renesas,rcar-gen2-cmm", }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, rcar_cmm_of_table); |
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static struct platform_driver rcar_cmm_platform_driver = { |
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.probe = rcar_cmm_probe, |
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.remove = rcar_cmm_remove, |
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.driver = { |
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.name = "rcar-cmm", |
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.of_match_table = rcar_cmm_of_table, |
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}, |
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}; |
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module_platform_driver(rcar_cmm_platform_driver); |
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MODULE_AUTHOR("Jacopo Mondi <[email protected]>"); |
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MODULE_DESCRIPTION("Renesas R-Car CMM Driver"); |
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MODULE_LICENSE("GPL v2");
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