435 lines
10 KiB
C
435 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2016 Marek Vasut <marex@denx.de>
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*
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* This code is based on drivers/video/fbdev/mxsfb.c :
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* Copyright (C) 2010 Juergen Beisert, Pengutronix
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* Copyright (C) 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
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* Copyright (C) 2008 Embedded Alley Solutions, Inc All Rights Reserved.
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*/
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#include <linux/clk.h>
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#include <linux/dma-mapping.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of_device.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_atomic_helper.h>
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#include <drm/drm_bridge.h>
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#include <drm/drm_connector.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_fbdev_generic.h>
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#include <drm/drm_fourcc.h>
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#include <drm/drm_gem_dma_helper.h>
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#include <drm/drm_gem_framebuffer_helper.h>
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#include <drm/drm_mode_config.h>
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#include <drm/drm_module.h>
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#include <drm/drm_of.h>
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#include <drm/drm_probe_helper.h>
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#include <drm/drm_vblank.h>
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#include "mxsfb_drv.h"
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#include "mxsfb_regs.h"
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enum mxsfb_devtype {
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MXSFB_V3,
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MXSFB_V4,
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/*
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* Starting at i.MX6 the hardware version register is gone, use the
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* i.MX family number as the version.
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*/
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MXSFB_V6,
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};
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static const struct mxsfb_devdata mxsfb_devdata[] = {
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[MXSFB_V3] = {
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.transfer_count = LCDC_V3_TRANSFER_COUNT,
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.cur_buf = LCDC_V3_CUR_BUF,
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.next_buf = LCDC_V3_NEXT_BUF,
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.hs_wdth_mask = 0xff,
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.hs_wdth_shift = 24,
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.has_overlay = false,
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.has_ctrl2 = false,
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.has_crc32 = false,
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},
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[MXSFB_V4] = {
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.transfer_count = LCDC_V4_TRANSFER_COUNT,
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.cur_buf = LCDC_V4_CUR_BUF,
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.next_buf = LCDC_V4_NEXT_BUF,
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.hs_wdth_mask = 0x3fff,
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.hs_wdth_shift = 18,
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.has_overlay = false,
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.has_ctrl2 = true,
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.has_crc32 = true,
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},
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[MXSFB_V6] = {
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.transfer_count = LCDC_V4_TRANSFER_COUNT,
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.cur_buf = LCDC_V4_CUR_BUF,
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.next_buf = LCDC_V4_NEXT_BUF,
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.hs_wdth_mask = 0x3fff,
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.hs_wdth_shift = 18,
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.has_overlay = true,
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.has_ctrl2 = true,
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.has_crc32 = true,
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},
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};
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void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb)
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{
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clk_prepare_enable(mxsfb->clk_axi);
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}
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void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb)
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{
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clk_disable_unprepare(mxsfb->clk_axi);
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}
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static struct drm_framebuffer *
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mxsfb_fb_create(struct drm_device *dev, struct drm_file *file_priv,
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const struct drm_mode_fb_cmd2 *mode_cmd)
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{
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const struct drm_format_info *info;
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info = drm_get_format_info(dev, mode_cmd);
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if (!info)
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return ERR_PTR(-EINVAL);
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if (mode_cmd->width * info->cpp[0] != mode_cmd->pitches[0]) {
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dev_dbg(dev->dev, "Invalid pitch: fb width must match pitch\n");
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return ERR_PTR(-EINVAL);
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}
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return drm_gem_fb_create(dev, file_priv, mode_cmd);
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}
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static const struct drm_mode_config_funcs mxsfb_mode_config_funcs = {
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.fb_create = mxsfb_fb_create,
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.atomic_check = drm_atomic_helper_check,
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.atomic_commit = drm_atomic_helper_commit,
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};
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static const struct drm_mode_config_helper_funcs mxsfb_mode_config_helpers = {
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.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
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};
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static int mxsfb_attach_bridge(struct mxsfb_drm_private *mxsfb)
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{
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struct drm_device *drm = mxsfb->drm;
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struct drm_connector_list_iter iter;
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struct drm_panel *panel;
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struct drm_bridge *bridge;
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int ret;
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ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0, &panel,
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&bridge);
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if (ret)
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return ret;
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if (panel) {
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bridge = devm_drm_panel_bridge_add_typed(drm->dev, panel,
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DRM_MODE_CONNECTOR_DPI);
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if (IS_ERR(bridge))
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return PTR_ERR(bridge);
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}
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if (!bridge)
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return -ENODEV;
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ret = drm_bridge_attach(&mxsfb->encoder, bridge, NULL, 0);
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if (ret)
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return dev_err_probe(drm->dev, ret, "Failed to attach bridge\n");
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mxsfb->bridge = bridge;
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/*
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* Get hold of the connector. This is a bit of a hack, until the bridge
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* API gives us bus flags and formats.
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*/
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drm_connector_list_iter_begin(drm, &iter);
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mxsfb->connector = drm_connector_list_iter_next(&iter);
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drm_connector_list_iter_end(&iter);
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return 0;
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}
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static irqreturn_t mxsfb_irq_handler(int irq, void *data)
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{
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struct drm_device *drm = data;
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struct mxsfb_drm_private *mxsfb = drm->dev_private;
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u32 reg, crc;
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u64 vbc;
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reg = readl(mxsfb->base + LCDC_CTRL1);
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if (reg & CTRL1_CUR_FRAME_DONE_IRQ) {
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drm_crtc_handle_vblank(&mxsfb->crtc);
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if (mxsfb->crc_active) {
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crc = readl(mxsfb->base + LCDC_V4_CRC_STAT);
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vbc = drm_crtc_accurate_vblank_count(&mxsfb->crtc);
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drm_crtc_add_crc_entry(&mxsfb->crtc, true, vbc, &crc);
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}
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}
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writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
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return IRQ_HANDLED;
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}
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static void mxsfb_irq_disable(struct drm_device *drm)
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{
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struct mxsfb_drm_private *mxsfb = drm->dev_private;
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mxsfb_enable_axi_clk(mxsfb);
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/* Disable and clear VBLANK IRQ */
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writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR);
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writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
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mxsfb_disable_axi_clk(mxsfb);
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}
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static int mxsfb_irq_install(struct drm_device *dev, int irq)
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{
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if (irq == IRQ_NOTCONNECTED)
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return -ENOTCONN;
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mxsfb_irq_disable(dev);
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return request_irq(irq, mxsfb_irq_handler, 0, dev->driver->name, dev);
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}
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static void mxsfb_irq_uninstall(struct drm_device *dev)
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{
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struct mxsfb_drm_private *mxsfb = dev->dev_private;
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mxsfb_irq_disable(dev);
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free_irq(mxsfb->irq, dev);
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}
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static int mxsfb_load(struct drm_device *drm,
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const struct mxsfb_devdata *devdata)
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{
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struct platform_device *pdev = to_platform_device(drm->dev);
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struct mxsfb_drm_private *mxsfb;
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struct resource *res;
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int ret;
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mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL);
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if (!mxsfb)
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return -ENOMEM;
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mxsfb->drm = drm;
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drm->dev_private = mxsfb;
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mxsfb->devdata = devdata;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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mxsfb->base = devm_ioremap_resource(drm->dev, res);
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if (IS_ERR(mxsfb->base))
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return PTR_ERR(mxsfb->base);
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mxsfb->clk = devm_clk_get(drm->dev, NULL);
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if (IS_ERR(mxsfb->clk))
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return PTR_ERR(mxsfb->clk);
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mxsfb->clk_axi = devm_clk_get_optional(drm->dev, "axi");
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if (IS_ERR(mxsfb->clk_axi))
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return PTR_ERR(mxsfb->clk_axi);
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mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi");
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if (IS_ERR(mxsfb->clk_disp_axi))
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mxsfb->clk_disp_axi = NULL;
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ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32));
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if (ret)
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return ret;
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pm_runtime_enable(drm->dev);
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/* Modeset init */
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drm_mode_config_init(drm);
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ret = mxsfb_kms_init(mxsfb);
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if (ret < 0) {
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dev_err(drm->dev, "Failed to initialize KMS pipeline\n");
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goto err_vblank;
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}
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ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
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if (ret < 0) {
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dev_err(drm->dev, "Failed to initialise vblank\n");
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goto err_vblank;
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}
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/* Start with vertical blanking interrupt reporting disabled. */
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drm_crtc_vblank_off(&mxsfb->crtc);
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ret = mxsfb_attach_bridge(mxsfb);
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if (ret) {
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dev_err_probe(drm->dev, ret, "Cannot connect bridge\n");
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goto err_vblank;
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}
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drm->mode_config.min_width = MXSFB_MIN_XRES;
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drm->mode_config.min_height = MXSFB_MIN_YRES;
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drm->mode_config.max_width = MXSFB_MAX_XRES;
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drm->mode_config.max_height = MXSFB_MAX_YRES;
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drm->mode_config.funcs = &mxsfb_mode_config_funcs;
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drm->mode_config.helper_private = &mxsfb_mode_config_helpers;
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drm_mode_config_reset(drm);
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ret = platform_get_irq(pdev, 0);
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if (ret < 0)
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goto err_vblank;
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mxsfb->irq = ret;
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pm_runtime_get_sync(drm->dev);
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ret = mxsfb_irq_install(drm, mxsfb->irq);
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pm_runtime_put_sync(drm->dev);
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if (ret < 0) {
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dev_err(drm->dev, "Failed to install IRQ handler\n");
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goto err_vblank;
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}
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drm_kms_helper_poll_init(drm);
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platform_set_drvdata(pdev, drm);
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drm_helper_hpd_irq_event(drm);
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return 0;
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err_vblank:
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pm_runtime_disable(drm->dev);
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return ret;
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}
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static void mxsfb_unload(struct drm_device *drm)
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{
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drm_kms_helper_poll_fini(drm);
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drm_mode_config_cleanup(drm);
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pm_runtime_get_sync(drm->dev);
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mxsfb_irq_uninstall(drm);
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pm_runtime_put_sync(drm->dev);
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drm->dev_private = NULL;
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pm_runtime_disable(drm->dev);
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}
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DEFINE_DRM_GEM_DMA_FOPS(fops);
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static const struct drm_driver mxsfb_driver = {
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.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
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DRM_GEM_DMA_DRIVER_OPS,
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.fops = &fops,
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.name = "mxsfb-drm",
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.desc = "MXSFB Controller DRM",
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.date = "20160824",
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.major = 1,
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.minor = 0,
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};
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static const struct of_device_id mxsfb_dt_ids[] = {
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{ .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devdata[MXSFB_V3], },
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{ .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devdata[MXSFB_V4], },
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{ .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devdata[MXSFB_V6], },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, mxsfb_dt_ids);
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static int mxsfb_probe(struct platform_device *pdev)
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{
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struct drm_device *drm;
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const struct of_device_id *of_id =
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of_match_device(mxsfb_dt_ids, &pdev->dev);
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int ret;
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if (!pdev->dev.of_node)
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return -ENODEV;
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drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev);
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if (IS_ERR(drm))
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return PTR_ERR(drm);
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ret = mxsfb_load(drm, of_id->data);
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if (ret)
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goto err_free;
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ret = drm_dev_register(drm, 0);
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if (ret)
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goto err_unload;
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drm_fbdev_generic_setup(drm, 32);
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return 0;
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err_unload:
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mxsfb_unload(drm);
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err_free:
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drm_dev_put(drm);
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return ret;
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}
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static int mxsfb_remove(struct platform_device *pdev)
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{
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struct drm_device *drm = platform_get_drvdata(pdev);
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drm_dev_unregister(drm);
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drm_atomic_helper_shutdown(drm);
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mxsfb_unload(drm);
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drm_dev_put(drm);
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return 0;
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}
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static void mxsfb_shutdown(struct platform_device *pdev)
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{
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struct drm_device *drm = platform_get_drvdata(pdev);
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drm_atomic_helper_shutdown(drm);
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}
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#ifdef CONFIG_PM_SLEEP
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static int mxsfb_suspend(struct device *dev)
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{
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struct drm_device *drm = dev_get_drvdata(dev);
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return drm_mode_config_helper_suspend(drm);
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}
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static int mxsfb_resume(struct device *dev)
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{
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struct drm_device *drm = dev_get_drvdata(dev);
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return drm_mode_config_helper_resume(drm);
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}
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#endif
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static const struct dev_pm_ops mxsfb_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(mxsfb_suspend, mxsfb_resume)
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};
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static struct platform_driver mxsfb_platform_driver = {
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.probe = mxsfb_probe,
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.remove = mxsfb_remove,
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.shutdown = mxsfb_shutdown,
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.driver = {
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.name = "mxsfb",
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.of_match_table = mxsfb_dt_ids,
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.pm = &mxsfb_pm_ops,
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},
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};
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drm_module_platform_driver(mxsfb_platform_driver);
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MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
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MODULE_DESCRIPTION("Freescale MXS DRM/KMS driver");
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MODULE_LICENSE("GPL");
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