blob: 28a78d3120bce31448123eaa9dad1c5ac6264e57 [file] [log] [blame]
/*
* Copyright (C) 2012 Avionic Design GmbH
* Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/clk.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_panel.h>
#include "drm.h"
#include "dc.h"
struct tegra_rgb {
struct tegra_output output;
struct tegra_dc *dc;
struct clk *clk_parent;
struct clk *clk;
};
static inline struct tegra_rgb *to_rgb(struct tegra_output *output)
{
return container_of(output, struct tegra_rgb, output);
}
struct reg_entry {
unsigned long offset;
unsigned long value;
};
static const struct reg_entry rgb_enable[] = {
{ DC_COM_PIN_OUTPUT_ENABLE(0), 0x00000000 },
{ DC_COM_PIN_OUTPUT_ENABLE(1), 0x00000000 },
{ DC_COM_PIN_OUTPUT_ENABLE(2), 0x00000000 },
{ DC_COM_PIN_OUTPUT_ENABLE(3), 0x00000000 },
{ DC_COM_PIN_OUTPUT_POLARITY(0), 0x00000000 },
{ DC_COM_PIN_OUTPUT_POLARITY(1), 0x01000000 },
{ DC_COM_PIN_OUTPUT_POLARITY(2), 0x00000000 },
{ DC_COM_PIN_OUTPUT_POLARITY(3), 0x00000000 },
{ DC_COM_PIN_OUTPUT_DATA(0), 0x00000000 },
{ DC_COM_PIN_OUTPUT_DATA(1), 0x00000000 },
{ DC_COM_PIN_OUTPUT_DATA(2), 0x00000000 },
{ DC_COM_PIN_OUTPUT_DATA(3), 0x00000000 },
{ DC_COM_PIN_OUTPUT_SELECT(0), 0x00000000 },
{ DC_COM_PIN_OUTPUT_SELECT(1), 0x00000000 },
{ DC_COM_PIN_OUTPUT_SELECT(2), 0x00000000 },
{ DC_COM_PIN_OUTPUT_SELECT(3), 0x00000000 },
{ DC_COM_PIN_OUTPUT_SELECT(4), 0x00210222 },
{ DC_COM_PIN_OUTPUT_SELECT(5), 0x00002200 },
{ DC_COM_PIN_OUTPUT_SELECT(6), 0x00020000 },
};
static const struct reg_entry rgb_disable[] = {
{ DC_COM_PIN_OUTPUT_SELECT(6), 0x00000000 },
{ DC_COM_PIN_OUTPUT_SELECT(5), 0x00000000 },
{ DC_COM_PIN_OUTPUT_SELECT(4), 0x00000000 },
{ DC_COM_PIN_OUTPUT_SELECT(3), 0x00000000 },
{ DC_COM_PIN_OUTPUT_SELECT(2), 0x00000000 },
{ DC_COM_PIN_OUTPUT_SELECT(1), 0x00000000 },
{ DC_COM_PIN_OUTPUT_SELECT(0), 0x00000000 },
{ DC_COM_PIN_OUTPUT_DATA(3), 0xaaaaaaaa },
{ DC_COM_PIN_OUTPUT_DATA(2), 0xaaaaaaaa },
{ DC_COM_PIN_OUTPUT_DATA(1), 0xaaaaaaaa },
{ DC_COM_PIN_OUTPUT_DATA(0), 0xaaaaaaaa },
{ DC_COM_PIN_OUTPUT_POLARITY(3), 0x00000000 },
{ DC_COM_PIN_OUTPUT_POLARITY(2), 0x00000000 },
{ DC_COM_PIN_OUTPUT_POLARITY(1), 0x00000000 },
{ DC_COM_PIN_OUTPUT_POLARITY(0), 0x00000000 },
{ DC_COM_PIN_OUTPUT_ENABLE(3), 0x55555555 },
{ DC_COM_PIN_OUTPUT_ENABLE(2), 0x55555555 },
{ DC_COM_PIN_OUTPUT_ENABLE(1), 0x55150005 },
{ DC_COM_PIN_OUTPUT_ENABLE(0), 0x55555555 },
};
static void tegra_dc_write_regs(struct tegra_dc *dc,
const struct reg_entry *table,
unsigned int num)
{
unsigned int i;
for (i = 0; i < num; i++)
tegra_dc_writel(dc, table[i].value, table[i].offset);
}
static const struct drm_connector_funcs tegra_rgb_connector_funcs = {
.reset = drm_atomic_helper_connector_reset,
.detect = tegra_output_connector_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = tegra_output_connector_destroy,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};
static enum drm_mode_status
tegra_rgb_connector_mode_valid(struct drm_connector *connector,
struct drm_display_mode *mode)
{
/*
* FIXME: For now, always assume that the mode is okay. There are
* unresolved issues with clk_round_rate(), which doesn't always
* reliably report whether a frequency can be set or not.
*/
return MODE_OK;
}
static const struct drm_connector_helper_funcs tegra_rgb_connector_helper_funcs = {
.get_modes = tegra_output_connector_get_modes,
.mode_valid = tegra_rgb_connector_mode_valid,
};
static const struct drm_encoder_funcs tegra_rgb_encoder_funcs = {
.destroy = tegra_output_encoder_destroy,
};
static void tegra_rgb_encoder_disable(struct drm_encoder *encoder)
{
struct tegra_output *output = encoder_to_output(encoder);
struct tegra_rgb *rgb = to_rgb(output);
if (output->panel)
drm_panel_disable(output->panel);
tegra_dc_write_regs(rgb->dc, rgb_disable, ARRAY_SIZE(rgb_disable));
tegra_dc_commit(rgb->dc);
if (output->panel)
drm_panel_unprepare(output->panel);
}
static void tegra_rgb_encoder_enable(struct drm_encoder *encoder)
{
struct tegra_output *output = encoder_to_output(encoder);
struct tegra_rgb *rgb = to_rgb(output);
u32 value;
if (output->panel)
drm_panel_prepare(output->panel);
tegra_dc_write_regs(rgb->dc, rgb_enable, ARRAY_SIZE(rgb_enable));
value = DE_SELECT_ACTIVE | DE_CONTROL_NORMAL;
tegra_dc_writel(rgb->dc, value, DC_DISP_DATA_ENABLE_OPTIONS);
/* XXX: parameterize? */
value = tegra_dc_readl(rgb->dc, DC_COM_PIN_OUTPUT_POLARITY(1));
value &= ~LVS_OUTPUT_POLARITY_LOW;
value &= ~LHS_OUTPUT_POLARITY_LOW;
tegra_dc_writel(rgb->dc, value, DC_COM_PIN_OUTPUT_POLARITY(1));
/* XXX: parameterize? */
value = DISP_DATA_FORMAT_DF1P1C | DISP_ALIGNMENT_MSB |
DISP_ORDER_RED_BLUE;
tegra_dc_writel(rgb->dc, value, DC_DISP_DISP_INTERFACE_CONTROL);
/* XXX: parameterize? */
value = SC0_H_QUALIFIER_NONE | SC1_H_QUALIFIER_NONE;
tegra_dc_writel(rgb->dc, value, DC_DISP_SHIFT_CLOCK_OPTIONS);
tegra_dc_commit(rgb->dc);
if (output->panel)
drm_panel_enable(output->panel);
}
static int
tegra_rgb_encoder_atomic_check(struct drm_encoder *encoder,
struct drm_crtc_state *crtc_state,
struct drm_connector_state *conn_state)
{
struct tegra_output *output = encoder_to_output(encoder);
struct tegra_dc *dc = to_tegra_dc(conn_state->crtc);
unsigned long pclk = crtc_state->mode.clock * 1000;
struct tegra_rgb *rgb = to_rgb(output);
unsigned int div;
int err;
/*
* We may not want to change the frequency of the parent clock, since
* it may be a parent for other peripherals. This is due to the fact
* that on Tegra20 there's only a single clock dedicated to display
* (pll_d_out0), whereas later generations have a second one that can
* be used to independently drive a second output (pll_d2_out0).
*
* As a way to support multiple outputs on Tegra20 as well, pll_p is
* typically used as the parent clock for the display controllers.
* But this comes at a cost: pll_p is the parent of several other
* peripherals, so its frequency shouldn't change out of the blue.
*
* The best we can do at this point is to use the shift clock divider
* and hope that the desired frequency can be matched (or at least
* matched sufficiently close that the panel will still work).
*/
div = ((clk_get_rate(rgb->clk) * 2) / pclk) - 2;
pclk = 0;
err = tegra_dc_state_setup_clock(dc, crtc_state, rgb->clk_parent,
pclk, div);
if (err < 0) {
dev_err(output->dev, "failed to setup CRTC state: %d\n", err);
return err;
}
return err;
}
static const struct drm_encoder_helper_funcs tegra_rgb_encoder_helper_funcs = {
.disable = tegra_rgb_encoder_disable,
.enable = tegra_rgb_encoder_enable,
.atomic_check = tegra_rgb_encoder_atomic_check,
};
int tegra_dc_rgb_probe(struct tegra_dc *dc)
{
struct device_node *np;
struct tegra_rgb *rgb;
int err;
np = of_get_child_by_name(dc->dev->of_node, "rgb");
if (!np || !of_device_is_available(np))
return -ENODEV;
rgb = devm_kzalloc(dc->dev, sizeof(*rgb), GFP_KERNEL);
if (!rgb)
return -ENOMEM;
rgb->output.dev = dc->dev;
rgb->output.of_node = np;
rgb->dc = dc;
err = tegra_output_probe(&rgb->output);
if (err < 0)
return err;
rgb->clk = devm_clk_get(dc->dev, NULL);
if (IS_ERR(rgb->clk)) {
dev_err(dc->dev, "failed to get clock\n");
return PTR_ERR(rgb->clk);
}
rgb->clk_parent = devm_clk_get(dc->dev, "parent");
if (IS_ERR(rgb->clk_parent)) {
dev_err(dc->dev, "failed to get parent clock\n");
return PTR_ERR(rgb->clk_parent);
}
err = clk_set_parent(rgb->clk, rgb->clk_parent);
if (err < 0) {
dev_err(dc->dev, "failed to set parent clock: %d\n", err);
return err;
}
dc->rgb = &rgb->output;
return 0;
}
int tegra_dc_rgb_remove(struct tegra_dc *dc)
{
if (!dc->rgb)
return 0;
tegra_output_remove(dc->rgb);
dc->rgb = NULL;
return 0;
}
int tegra_dc_rgb_init(struct drm_device *drm, struct tegra_dc *dc)
{
struct tegra_output *output = dc->rgb;
int err;
if (!dc->rgb)
return -ENODEV;
drm_connector_init(drm, &output->connector, &tegra_rgb_connector_funcs,
DRM_MODE_CONNECTOR_LVDS);
drm_connector_helper_add(&output->connector,
&tegra_rgb_connector_helper_funcs);
output->connector.dpms = DRM_MODE_DPMS_OFF;
drm_encoder_init(drm, &output->encoder, &tegra_rgb_encoder_funcs,
DRM_MODE_ENCODER_LVDS, NULL);
drm_encoder_helper_add(&output->encoder,
&tegra_rgb_encoder_helper_funcs);
drm_connector_attach_encoder(&output->connector,
&output->encoder);
drm_connector_register(&output->connector);
err = tegra_output_init(drm, output);
if (err < 0) {
dev_err(output->dev, "failed to initialize output: %d\n", err);
return err;
}
/*
* Other outputs can be attached to either display controller. The RGB
* outputs are an exception and work only with their parent display
* controller.
*/
output->encoder.possible_crtcs = drm_crtc_mask(&dc->base);
return 0;
}
int tegra_dc_rgb_exit(struct tegra_dc *dc)
{
if (dc->rgb)
tegra_output_exit(dc->rgb);
return 0;
}