// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2015 Broadcom */ /** * DOC: VC4 HVS module. * * The Hardware Video Scaler (HVS) is the piece of hardware that does * translation, scaling, colorspace conversion, and compositing of * pixels stored in framebuffers into a FIFO of pixels going out to * the Pixel Valve (CRTC). It operates at the system clock rate (the * system audio clock gate, specifically), which is much higher than * the pixel clock rate. * * There is a single global HVS, with multiple output FIFOs that can * be consumed by the PVs. This file just manages the resources for * the HVS, while the vc4_crtc.c code actually drives HVS setup for * each CRTC. */ #include <linux/bitfield.h> #include <linux/clk.h> #include <linux/component.h> #include <linux/platform_device.h> #include <drm/drm_atomic_helper.h> #include <drm/drm_drv.h> #include <drm/drm_vblank.h> #include <soc/bcm2835/raspberrypi-firmware.h> #include "vc4_drv.h" #include "vc4_regs.h" static const struct debugfs_reg32 hvs_regs[] = …; void vc4_hvs_dump_state(struct vc4_hvs *hvs) { … } static int vc4_hvs_debugfs_underrun(struct seq_file *m, void *data) { … } static int vc4_hvs_debugfs_dlist(struct seq_file *m, void *data) { … } /* The filter kernel is composed of dwords each containing 3 9-bit * signed integers packed next to each other. */ #define VC4_INT_TO_COEFF(coeff) … #define VC4_PPF_FILTER_WORD(c0, c1, c2) … /* The whole filter kernel is arranged as the coefficients 0-16 going * up, then a pad, then 17-31 going down and reversed within the * dwords. This means that a linear phase kernel (where it's * symmetrical at the boundary between 15 and 16) has the last 5 * dwords matching the first 5, but reversed. */ #define VC4_LINEAR_PHASE_KERNEL(c0, c1, c2, c3, c4, c5, c6, c7, c8, \ c9, c10, c11, c12, c13, c14, c15) … #define VC4_LINEAR_PHASE_KERNEL_DWORDS … #define VC4_KERNEL_DWORDS … /* Recommended B=1/3, C=1/3 filter choice from Mitchell/Netravali. * http://www.cs.utexas.edu/~fussell/courses/cs384g/lectures/mitchell/Mitchell.pdf */ static const u32 mitchell_netravali_1_3_1_3_kernel[] = …; static int vc4_hvs_upload_linear_kernel(struct vc4_hvs *hvs, struct drm_mm_node *space, const u32 *kernel) { … } static void vc4_hvs_lut_load(struct vc4_hvs *hvs, struct vc4_crtc *vc4_crtc) { … } static void vc4_hvs_update_gamma_lut(struct vc4_hvs *hvs, struct vc4_crtc *vc4_crtc) { … } u8 vc4_hvs_get_fifo_frame_count(struct vc4_hvs *hvs, unsigned int fifo) { … } int vc4_hvs_get_fifo_from_output(struct vc4_hvs *hvs, unsigned int output) { … } static int vc4_hvs_init_channel(struct vc4_hvs *hvs, struct drm_crtc *crtc, struct drm_display_mode *mode, bool oneshot) { … } void vc4_hvs_stop_channel(struct vc4_hvs *hvs, unsigned int chan) { … } int vc4_hvs_atomic_check(struct drm_crtc *crtc, struct drm_atomic_state *state) { … } static void vc4_hvs_install_dlist(struct drm_crtc *crtc) { … } static void vc4_hvs_update_dlist(struct drm_crtc *crtc) { … } void vc4_hvs_atomic_begin(struct drm_crtc *crtc, struct drm_atomic_state *state) { … } void vc4_hvs_atomic_enable(struct drm_crtc *crtc, struct drm_atomic_state *state) { … } void vc4_hvs_atomic_disable(struct drm_crtc *crtc, struct drm_atomic_state *state) { … } void vc4_hvs_atomic_flush(struct drm_crtc *crtc, struct drm_atomic_state *state) { … } void vc4_hvs_mask_underrun(struct vc4_hvs *hvs, int channel) { … } void vc4_hvs_unmask_underrun(struct vc4_hvs *hvs, int channel) { … } static void vc4_hvs_report_underrun(struct drm_device *dev) { … } static irqreturn_t vc4_hvs_irq_handler(int irq, void *data) { … } int vc4_hvs_debugfs_init(struct drm_minor *minor) { … } struct vc4_hvs *__vc4_hvs_alloc(struct vc4_dev *vc4, struct platform_device *pdev) { … } static int vc4_hvs_bind(struct device *dev, struct device *master, void *data) { … } static void vc4_hvs_unbind(struct device *dev, struct device *master, void *data) { … } static const struct component_ops vc4_hvs_ops = …; static int vc4_hvs_dev_probe(struct platform_device *pdev) { … } static void vc4_hvs_dev_remove(struct platform_device *pdev) { … } static const struct of_device_id vc4_hvs_dt_match[] = …; struct platform_driver vc4_hvs_driver = …;
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