// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2023 Loongson Technology Corporation Limited */ #include <linux/debugfs.h> #include <linux/delay.h> #include <drm/drm_atomic.h> #include <drm/drm_atomic_helper.h> #include <drm/drm_debugfs.h> #include <drm/drm_vblank.h> #include "lsdc_drv.h" /* * After the CRTC soft reset, the vblank counter would be reset to zero. * But the address and other settings in the CRTC register remain the same * as before. */ static void lsdc_crtc0_soft_reset(struct lsdc_crtc *lcrtc) { … } static void lsdc_crtc1_soft_reset(struct lsdc_crtc *lcrtc) { … } static void lsdc_crtc0_enable(struct lsdc_crtc *lcrtc) { … } static void lsdc_crtc0_disable(struct lsdc_crtc *lcrtc) { … } static void lsdc_crtc1_enable(struct lsdc_crtc *lcrtc) { … } static void lsdc_crtc1_disable(struct lsdc_crtc *lcrtc) { … } /* All Loongson display controllers have hardware scanout position recoders */ static void lsdc_crtc0_scan_pos(struct lsdc_crtc *lcrtc, int *hpos, int *vpos) { … } static void lsdc_crtc1_scan_pos(struct lsdc_crtc *lcrtc, int *hpos, int *vpos) { … } static void lsdc_crtc0_enable_vblank(struct lsdc_crtc *lcrtc) { … } static void lsdc_crtc0_disable_vblank(struct lsdc_crtc *lcrtc) { … } static void lsdc_crtc1_enable_vblank(struct lsdc_crtc *lcrtc) { … } static void lsdc_crtc1_disable_vblank(struct lsdc_crtc *lcrtc) { … } static void lsdc_crtc0_flip(struct lsdc_crtc *lcrtc) { … } static void lsdc_crtc1_flip(struct lsdc_crtc *lcrtc) { … } /* * CRTC0 clone from CRTC1 or CRTC1 clone from CRTC0 using hardware logic * This may be useful for custom cloning (TWIN) applications. Saving the * bandwidth compared with the clone (mirroring) display mode provided by * drm core. */ static void lsdc_crtc0_clone(struct lsdc_crtc *lcrtc) { … } static void lsdc_crtc1_clone(struct lsdc_crtc *lcrtc) { … } static void lsdc_crtc0_set_mode(struct lsdc_crtc *lcrtc, const struct drm_display_mode *mode) { … } static void lsdc_crtc1_set_mode(struct lsdc_crtc *lcrtc, const struct drm_display_mode *mode) { … } /* * This is required for S3 support. * After resuming from suspend, LSDC_CRTCx_CFG_REG (x = 0 or 1) is filled * with garbage value, which causes the CRTC hang there. * * This function provides minimal settings for the affected registers. * This overrides the firmware's settings on startup, making the CRTC work * on our own, similar to the functional of GPU POST (Power On Self Test). * Only touch CRTC hardware-related parts. */ static void lsdc_crtc0_reset(struct lsdc_crtc *lcrtc) { … } static void lsdc_crtc1_reset(struct lsdc_crtc *lcrtc) { … } static const struct lsdc_crtc_hw_ops ls7a1000_crtc_hw_ops[2] = …; /* * The 32-bit hardware vblank counter has been available since LS7A2000 * and LS2K2000. The counter increases even though the CRTC is disabled, * it will be reset only if the CRTC is being soft reset. * Those registers are also readable for ls7a1000, but its value does not * change. */ static u32 lsdc_crtc0_get_vblank_count(struct lsdc_crtc *lcrtc) { … } static u32 lsdc_crtc1_get_vblank_count(struct lsdc_crtc *lcrtc) { … } /* * The DMA step bit fields are available since LS7A2000/LS2K2000, for * supporting odd resolutions. But a large DMA step save the bandwidth. * The larger, the better. Behavior of writing those bits on LS7A1000 * or LS2K1000 is underfined. */ static void lsdc_crtc0_set_dma_step(struct lsdc_crtc *lcrtc, enum lsdc_dma_steps dma_step) { … } static void lsdc_crtc1_set_dma_step(struct lsdc_crtc *lcrtc, enum lsdc_dma_steps dma_step) { … } static const struct lsdc_crtc_hw_ops ls7a2000_crtc_hw_ops[2] = …; static void lsdc_crtc_reset(struct drm_crtc *crtc) { … } static void lsdc_crtc_atomic_destroy_state(struct drm_crtc *crtc, struct drm_crtc_state *state) { … } static struct drm_crtc_state * lsdc_crtc_atomic_duplicate_state(struct drm_crtc *crtc) { … } static u32 lsdc_crtc_get_vblank_counter(struct drm_crtc *crtc) { … } static int lsdc_crtc_enable_vblank(struct drm_crtc *crtc) { … } static void lsdc_crtc_disable_vblank(struct drm_crtc *crtc) { … } /* * CRTC related debugfs * Primary planes and cursor planes belong to the CRTC as well. * For the sake of convenience, plane-related registers are also add here. */ #define REG_DEF(reg) … static const struct lsdc_reg32 lsdc_crtc_regs_array[2][21] = …; static int lsdc_crtc_show_regs(struct seq_file *m, void *arg) { … } static int lsdc_crtc_show_scan_position(struct seq_file *m, void *arg) { … } static int lsdc_crtc_show_vblank_counter(struct seq_file *m, void *arg) { … } static int lsdc_pixpll_show_clock(struct seq_file *m, void *arg) { … } static struct drm_info_list lsdc_crtc_debugfs_list[2][4] = …; /* operate manually */ static int lsdc_crtc_man_op_show(struct seq_file *m, void *data) { … } static int lsdc_crtc_man_op_open(struct inode *inode, struct file *file) { … } static ssize_t lsdc_crtc_man_op_write(struct file *file, const char __user *ubuf, size_t len, loff_t *offp) { … } static const struct file_operations lsdc_crtc_man_op_fops = …; static int lsdc_crtc_late_register(struct drm_crtc *crtc) { … } static void lsdc_crtc_atomic_print_state(struct drm_printer *p, const struct drm_crtc_state *state) { … } static const struct drm_crtc_funcs ls7a1000_crtc_funcs = …; static const struct drm_crtc_funcs ls7a2000_crtc_funcs = …; static enum drm_mode_status lsdc_crtc_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode *mode) { … } static int lsdc_pixpll_atomic_check(struct drm_crtc *crtc, struct drm_crtc_state *state) { … } static int lsdc_crtc_helper_atomic_check(struct drm_crtc *crtc, struct drm_atomic_state *state) { … } static void lsdc_crtc_mode_set_nofb(struct drm_crtc *crtc) { … } static void lsdc_crtc_send_vblank(struct drm_crtc *crtc) { … } static void lsdc_crtc_atomic_enable(struct drm_crtc *crtc, struct drm_atomic_state *state) { … } static void lsdc_crtc_atomic_disable(struct drm_crtc *crtc, struct drm_atomic_state *state) { … } static void lsdc_crtc_atomic_flush(struct drm_crtc *crtc, struct drm_atomic_state *state) { … } static bool lsdc_crtc_get_scanout_position(struct drm_crtc *crtc, bool in_vblank_irq, int *vpos, int *hpos, ktime_t *stime, ktime_t *etime, const struct drm_display_mode *mode) { … } static const struct drm_crtc_helper_funcs lsdc_crtc_helper_funcs = …; int ls7a1000_crtc_init(struct drm_device *ddev, struct drm_crtc *crtc, struct drm_plane *primary, struct drm_plane *cursor, unsigned int index, bool has_vblank) { … } int ls7a2000_crtc_init(struct drm_device *ddev, struct drm_crtc *crtc, struct drm_plane *primary, struct drm_plane *cursor, unsigned int index, bool has_vblank) { … }
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