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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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7602fa1d29
Previously the association to a DC was done via the encoder's .crtc field. That has the disadvantage that when an encoder is detached from its CRTC, that field is set to NULL, leading to situations where it is impossible to access the DC registers required by the RGB output. However, the coupling between DC and RGB output is really fixed on Tegra. While they can be detached logically in DRM, the RGB output can rely on the DC's existence. Signed-off-by: Thierry Reding <treding@nvidia.com>
242 lines
6 KiB
C
242 lines
6 KiB
C
/*
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* Copyright (C) 2012 Avionic Design GmbH
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* Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/clk.h>
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#include "drm.h"
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#include "dc.h"
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struct tegra_rgb {
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struct tegra_output output;
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struct tegra_dc *dc;
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struct clk *clk_parent;
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struct clk *clk;
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};
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static inline struct tegra_rgb *to_rgb(struct tegra_output *output)
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{
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return container_of(output, struct tegra_rgb, output);
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}
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struct reg_entry {
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unsigned long offset;
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unsigned long value;
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};
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static const struct reg_entry rgb_enable[] = {
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{ DC_COM_PIN_OUTPUT_ENABLE(0), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_ENABLE(1), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_ENABLE(2), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_ENABLE(3), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_POLARITY(0), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_POLARITY(1), 0x01000000 },
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{ DC_COM_PIN_OUTPUT_POLARITY(2), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_POLARITY(3), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_DATA(0), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_DATA(1), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_DATA(2), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_DATA(3), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_SELECT(0), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_SELECT(1), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_SELECT(2), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_SELECT(3), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_SELECT(4), 0x00210222 },
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{ DC_COM_PIN_OUTPUT_SELECT(5), 0x00002200 },
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{ DC_COM_PIN_OUTPUT_SELECT(6), 0x00020000 },
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};
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static const struct reg_entry rgb_disable[] = {
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{ DC_COM_PIN_OUTPUT_SELECT(6), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_SELECT(5), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_SELECT(4), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_SELECT(3), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_SELECT(2), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_SELECT(1), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_SELECT(0), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_DATA(3), 0xaaaaaaaa },
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{ DC_COM_PIN_OUTPUT_DATA(2), 0xaaaaaaaa },
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{ DC_COM_PIN_OUTPUT_DATA(1), 0xaaaaaaaa },
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{ DC_COM_PIN_OUTPUT_DATA(0), 0xaaaaaaaa },
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{ DC_COM_PIN_OUTPUT_POLARITY(3), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_POLARITY(2), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_POLARITY(1), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_POLARITY(0), 0x00000000 },
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{ DC_COM_PIN_OUTPUT_ENABLE(3), 0x55555555 },
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{ DC_COM_PIN_OUTPUT_ENABLE(2), 0x55555555 },
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{ DC_COM_PIN_OUTPUT_ENABLE(1), 0x55150005 },
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{ DC_COM_PIN_OUTPUT_ENABLE(0), 0x55555555 },
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};
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static void tegra_dc_write_regs(struct tegra_dc *dc,
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const struct reg_entry *table,
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unsigned int num)
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{
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unsigned int i;
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for (i = 0; i < num; i++)
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tegra_dc_writel(dc, table[i].value, table[i].offset);
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}
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static int tegra_output_rgb_enable(struct tegra_output *output)
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{
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struct tegra_rgb *rgb = to_rgb(output);
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tegra_dc_write_regs(rgb->dc, rgb_enable, ARRAY_SIZE(rgb_enable));
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return 0;
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}
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static int tegra_output_rgb_disable(struct tegra_output *output)
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{
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struct tegra_rgb *rgb = to_rgb(output);
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tegra_dc_write_regs(rgb->dc, rgb_disable, ARRAY_SIZE(rgb_disable));
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return 0;
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}
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static int tegra_output_rgb_setup_clock(struct tegra_output *output,
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struct clk *clk, unsigned long pclk)
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{
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struct tegra_rgb *rgb = to_rgb(output);
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return clk_set_parent(clk, rgb->clk_parent);
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}
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static int tegra_output_rgb_check_mode(struct tegra_output *output,
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struct drm_display_mode *mode,
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enum drm_mode_status *status)
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{
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/*
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* FIXME: For now, always assume that the mode is okay. There are
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* unresolved issues with clk_round_rate(), which doesn't always
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* reliably report whether a frequency can be set or not.
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*/
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*status = MODE_OK;
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return 0;
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}
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static const struct tegra_output_ops rgb_ops = {
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.enable = tegra_output_rgb_enable,
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.disable = tegra_output_rgb_disable,
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.setup_clock = tegra_output_rgb_setup_clock,
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.check_mode = tegra_output_rgb_check_mode,
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};
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int tegra_dc_rgb_probe(struct tegra_dc *dc)
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{
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struct device_node *np;
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struct tegra_rgb *rgb;
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int err;
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np = of_get_child_by_name(dc->dev->of_node, "rgb");
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if (!np || !of_device_is_available(np))
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return -ENODEV;
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rgb = devm_kzalloc(dc->dev, sizeof(*rgb), GFP_KERNEL);
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if (!rgb)
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return -ENOMEM;
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rgb->output.dev = dc->dev;
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rgb->output.of_node = np;
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rgb->dc = dc;
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err = tegra_output_probe(&rgb->output);
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if (err < 0)
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return err;
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rgb->clk = devm_clk_get(dc->dev, NULL);
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if (IS_ERR(rgb->clk)) {
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dev_err(dc->dev, "failed to get clock\n");
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return PTR_ERR(rgb->clk);
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}
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rgb->clk_parent = devm_clk_get(dc->dev, "parent");
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if (IS_ERR(rgb->clk_parent)) {
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dev_err(dc->dev, "failed to get parent clock\n");
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return PTR_ERR(rgb->clk_parent);
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}
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err = clk_set_parent(rgb->clk, rgb->clk_parent);
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if (err < 0) {
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dev_err(dc->dev, "failed to set parent clock: %d\n", err);
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return err;
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}
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dc->rgb = &rgb->output;
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return 0;
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}
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int tegra_dc_rgb_remove(struct tegra_dc *dc)
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{
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int err;
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if (!dc->rgb)
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return 0;
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err = tegra_output_remove(dc->rgb);
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if (err < 0)
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return err;
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return 0;
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}
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int tegra_dc_rgb_init(struct drm_device *drm, struct tegra_dc *dc)
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{
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struct tegra_rgb *rgb = to_rgb(dc->rgb);
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int err;
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if (!dc->rgb)
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return -ENODEV;
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rgb->output.type = TEGRA_OUTPUT_RGB;
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rgb->output.ops = &rgb_ops;
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err = tegra_output_init(dc->base.dev, &rgb->output);
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if (err < 0) {
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dev_err(dc->dev, "output setup failed: %d\n", err);
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return err;
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}
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/*
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* By default, outputs can be associated with each display controller.
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* RGB outputs are an exception, so we make sure they can be attached
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* to only their parent display controller.
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*/
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rgb->output.encoder.possible_crtcs = 1 << dc->pipe;
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return 0;
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}
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int tegra_dc_rgb_exit(struct tegra_dc *dc)
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{
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if (dc->rgb) {
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int err;
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err = tegra_output_disable(dc->rgb);
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if (err < 0) {
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dev_err(dc->dev, "output failed to disable: %d\n", err);
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return err;
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}
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err = tegra_output_exit(dc->rgb);
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if (err < 0) {
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dev_err(dc->dev, "output cleanup failed: %d\n", err);
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return err;
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}
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dc->rgb = NULL;
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}
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return 0;
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}
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