renesas/rcar-du/rcar_cmm.c

1 // SPDX-License-Identifier: GPL-2.0+
3  * R-Car Display Unit Color Management Module
27 	 * @lut:		1D-LUT state
28 	 * @lut.enabled:	1D-LUT enabled flag
37 	return ioread32(rcmm->base + reg);  in rcar_cmm_read()
42 	iowrite32(data, rcmm->base + reg);  in rcar_cmm_write()
46  * rcar_cmm_lut_write() - Scale the DRM LUT table entries to hardware precision
47  *			  and write to the CMM registers
48  * @rcmm: Pointer to the CMM device
66  * rcar_cmm_setup() - Configure the CMM unit
67  * @pdev: The platform device associated with the CMM instance
68  * @config: The CMM unit configuration
70  * Configure the CMM unit with the given configuration. Currently enabling,
71  * disabling and programming of the 1-D LUT unit is supported.
73  * As rcar_cmm_setup() accesses the CMM registers the unit should be powered
75  * this function is made, the CMM unit has to be enabled by calling
87 	if (!config->lut.table) {  in rcar_cmm_setup()
88 		if (rcmm->lut.enabled) {  in rcar_cmm_setup()
90 			rcmm->lut.enabled = false;  in rcar_cmm_setup()
97 	if (!rcmm->lut.enabled) {  in rcar_cmm_setup()
99 		rcmm->lut.enabled = true;  in rcar_cmm_setup()
102 	rcar_cmm_lut_write(rcmm, config->lut.table);  in rcar_cmm_setup()
109  * rcar_cmm_enable() - Enable the CMM unit
110  * @pdev: The platform device associated with the CMM instance
112  * When the output of the corresponding DU channel is routed to the CMM unit,
114  * enabled until the channel is stopped. The CMM unit shall be disabled with
117  * Calls to rcar_cmm_enable() and rcar_cmm_disable() are not reference-counted.
118  * It is an error to attempt to enable an already enabled CMM unit, or to
125 	ret = pm_runtime_resume_and_get(&pdev->dev);  in rcar_cmm_enable()
134  * rcar_cmm_disable() - Disable the CMM unit
135  * @pdev: The platform device associated with the CMM instance
139  * Disabling the CMM unit disable all the internal processing blocks. The CMM
140  * state shall thus be restored with rcar_cmm_setup() when re-enabling the CMM
148 	rcmm->lut.enabled = false;  in rcar_cmm_disable()
150 	pm_runtime_put(&pdev->dev);  in rcar_cmm_disable()
155  * rcar_cmm_init() - Initialize the CMM unit
156  * @pdev: The platform device associated with the CMM instance
158  * Return: 0 on success, -EPROBE_DEFER if the CMM is not available yet,
159  *         -ENODEV if the DRM_RCAR_CMM config option is disabled
166 		return -EPROBE_DEFER;  in rcar_cmm_init()
176 	rcmm = devm_kzalloc(&pdev->dev, sizeof(*rcmm), GFP_KERNEL);  in rcar_cmm_probe()
178 		return -ENOMEM;  in rcar_cmm_probe()
181 	rcmm->base = devm_platform_ioremap_resource(pdev, 0);  in rcar_cmm_probe()
182 	if (IS_ERR(rcmm->base))  in rcar_cmm_probe()
183 		return PTR_ERR(rcmm->base);  in rcar_cmm_probe()
185 	pm_runtime_enable(&pdev->dev);  in rcar_cmm_probe()
192 	pm_runtime_disable(&pdev->dev);  in rcar_cmm_remove()
196 	{ .compatible = "renesas,rcar-gen3-cmm", },
197 	{ .compatible = "renesas,rcar-gen2-cmm", },
206 		.name	= "rcar-cmm",
214 MODULE_DESCRIPTION("Renesas R-Car CMM Driver");