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path: root/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
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Diffstat (limited to 'drivers/gpu/drm/mediatek/mtk_disp_gamma.c')
-rw-r--r--drivers/gpu/drm/mediatek/mtk_disp_gamma.c197
1 files changed, 197 insertions, 0 deletions
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
new file mode 100644
index 000000000000..3ebf91e0ab41
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
@@ -0,0 +1,197 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021 MediaTek Inc.
+ */
+
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/soc/mediatek/mtk-cmdq.h>
+
+#include "mtk_disp_drv.h"
+#include "mtk_drm_crtc.h"
+#include "mtk_drm_ddp_comp.h"
+
+#define DISP_GAMMA_EN 0x0000
+#define GAMMA_EN BIT(0)
+#define DISP_GAMMA_CFG 0x0020
+#define GAMMA_LUT_EN BIT(1)
+#define GAMMA_DITHERING BIT(2)
+#define DISP_GAMMA_SIZE 0x0030
+#define DISP_GAMMA_LUT 0x0700
+
+#define LUT_10BIT_MASK 0x03ff
+
+struct mtk_disp_gamma_data {
+ bool has_dither;
+};
+
+/**
+ * struct mtk_disp_gamma - DISP_GAMMA driver structure
+ * @ddp_comp - structure containing type enum and hardware resources
+ * @crtc - associated crtc to report irq events to
+ */
+struct mtk_disp_gamma {
+ struct clk *clk;
+ void __iomem *regs;
+ struct cmdq_client_reg cmdq_reg;
+ const struct mtk_disp_gamma_data *data;
+};
+
+int mtk_gamma_clk_enable(struct device *dev)
+{
+ struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
+
+ return clk_prepare_enable(gamma->clk);
+}
+
+void mtk_gamma_clk_disable(struct device *dev)
+{
+ struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
+
+ clk_disable_unprepare(gamma->clk);
+}
+
+void mtk_gamma_set_common(void __iomem *regs, struct drm_crtc_state *state)
+{
+ unsigned int i, reg;
+ struct drm_color_lut *lut;
+ void __iomem *lut_base;
+ u32 word;
+
+ if (state->gamma_lut) {
+ reg = readl(regs + DISP_GAMMA_CFG);
+ reg = reg | GAMMA_LUT_EN;
+ writel(reg, regs + DISP_GAMMA_CFG);
+ lut_base = regs + DISP_GAMMA_LUT;
+ lut = (struct drm_color_lut *)state->gamma_lut->data;
+ for (i = 0; i < MTK_LUT_SIZE; i++) {
+ word = (((lut[i].red >> 6) & LUT_10BIT_MASK) << 20) +
+ (((lut[i].green >> 6) & LUT_10BIT_MASK) << 10) +
+ ((lut[i].blue >> 6) & LUT_10BIT_MASK);
+ writel(word, (lut_base + i * 4));
+ }
+ }
+}
+
+void mtk_gamma_set(struct device *dev, struct drm_crtc_state *state)
+{
+ struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
+
+ mtk_gamma_set_common(gamma->regs, state);
+}
+
+void mtk_gamma_config(struct device *dev, unsigned int w,
+ unsigned int h, unsigned int vrefresh,
+ unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
+{
+ struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
+
+ mtk_ddp_write(cmdq_pkt, h << 16 | w, &gamma->cmdq_reg, gamma->regs,
+ DISP_GAMMA_SIZE);
+ if (gamma->data && gamma->data->has_dither)
+ mtk_dither_set_common(gamma->regs, &gamma->cmdq_reg, bpc,
+ DISP_GAMMA_CFG, GAMMA_DITHERING, cmdq_pkt);
+}
+
+void mtk_gamma_start(struct device *dev)
+{
+ struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
+
+ writel(GAMMA_EN, gamma->regs + DISP_GAMMA_EN);
+}
+
+void mtk_gamma_stop(struct device *dev)
+{
+ struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
+
+ writel_relaxed(0x0, gamma->regs + DISP_GAMMA_EN);
+}
+
+static int mtk_disp_gamma_bind(struct device *dev, struct device *master,
+ void *data)
+{
+ return 0;
+}
+
+static void mtk_disp_gamma_unbind(struct device *dev, struct device *master,
+ void *data)
+{
+}
+
+static const struct component_ops mtk_disp_gamma_component_ops = {
+ .bind = mtk_disp_gamma_bind,
+ .unbind = mtk_disp_gamma_unbind,
+};
+
+static int mtk_disp_gamma_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct mtk_disp_gamma *priv;
+ struct resource *res;
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(priv->clk)) {
+ dev_err(dev, "failed to get gamma clk\n");
+ return PTR_ERR(priv->clk);
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ priv->regs = devm_ioremap_resource(dev, res);
+ if (IS_ERR(priv->regs)) {
+ dev_err(dev, "failed to ioremap gamma\n");
+ return PTR_ERR(priv->regs);
+ }
+
+#if IS_REACHABLE(CONFIG_MTK_CMDQ)
+ ret = cmdq_dev_get_client_reg(dev, &priv->cmdq_reg, 0);
+ if (ret)
+ dev_dbg(dev, "get mediatek,gce-client-reg fail!\n");
+#endif
+
+ priv->data = of_device_get_match_data(dev);
+ platform_set_drvdata(pdev, priv);
+
+ ret = component_add(dev, &mtk_disp_gamma_component_ops);
+ if (ret)
+ dev_err(dev, "Failed to add component: %d\n", ret);
+
+ return ret;
+}
+
+static int mtk_disp_gamma_remove(struct platform_device *pdev)
+{
+ component_del(&pdev->dev, &mtk_disp_gamma_component_ops);
+
+ return 0;
+}
+
+static const struct mtk_disp_gamma_data mt8173_gamma_driver_data = {
+ .has_dither = true,
+};
+
+static const struct of_device_id mtk_disp_gamma_driver_dt_match[] = {
+ { .compatible = "mediatek,mt8173-disp-gamma",
+ .data = &mt8173_gamma_driver_data},
+ { .compatible = "mediatek,mt8183-disp-gamma"},
+ {},
+};
+MODULE_DEVICE_TABLE(of, mtk_disp_gamma_driver_dt_match);
+
+struct platform_driver mtk_disp_gamma_driver = {
+ .probe = mtk_disp_gamma_probe,
+ .remove = mtk_disp_gamma_remove,
+ .driver = {
+ .name = "mediatek-disp-gamma",
+ .owner = THIS_MODULE,
+ .of_match_table = mtk_disp_gamma_driver_dt_match,
+ },
+};