d2912cb15b
Based on 2 normalized pattern(s): 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 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
103 lines
2.4 KiB
C
103 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (C) 2012 Russell King
|
|
*
|
|
* Armada 510 (aka Dove) variant support
|
|
*/
|
|
#include <linux/clk.h>
|
|
#include <linux/io.h>
|
|
#include <drm/drm_probe_helper.h>
|
|
#include "armada_crtc.h"
|
|
#include "armada_drm.h"
|
|
#include "armada_hw.h"
|
|
|
|
static int armada510_crtc_init(struct armada_crtc *dcrtc, struct device *dev)
|
|
{
|
|
struct clk *clk;
|
|
|
|
clk = devm_clk_get(dev, "ext_ref_clk1");
|
|
if (IS_ERR(clk))
|
|
return PTR_ERR(clk) == -ENOENT ? -EPROBE_DEFER : PTR_ERR(clk);
|
|
|
|
dcrtc->extclk[0] = clk;
|
|
|
|
/* Lower the watermark so to eliminate jitter at higher bandwidths */
|
|
armada_updatel(0x20, (1 << 11) | 0xff, dcrtc->base + LCD_CFG_RDREG4F);
|
|
|
|
/* Initialise SPU register */
|
|
writel_relaxed(ADV_HWC32ENABLE | ADV_HWC32ARGB | ADV_HWC32BLEND,
|
|
dcrtc->base + LCD_SPU_ADV_REG);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Armada510 specific SCLK register selection.
|
|
* This gets called with sclk = NULL to test whether the mode is
|
|
* supportable, and again with sclk != NULL to set the clocks up for
|
|
* that. The former can return an error, but the latter is expected
|
|
* not to.
|
|
*
|
|
* We currently are pretty rudimentary here, always selecting
|
|
* EXT_REF_CLK_1 for LCD0 and erroring LCD1. This needs improvement!
|
|
*/
|
|
static int armada510_crtc_compute_clock(struct armada_crtc *dcrtc,
|
|
const struct drm_display_mode *mode, uint32_t *sclk)
|
|
{
|
|
struct clk *clk = dcrtc->extclk[0];
|
|
int ret;
|
|
|
|
if (dcrtc->num == 1)
|
|
return -EINVAL;
|
|
|
|
if (IS_ERR(clk))
|
|
return PTR_ERR(clk);
|
|
|
|
if (dcrtc->clk != clk) {
|
|
ret = clk_prepare_enable(clk);
|
|
if (ret)
|
|
return ret;
|
|
dcrtc->clk = clk;
|
|
}
|
|
|
|
if (sclk) {
|
|
uint32_t rate, ref, div;
|
|
|
|
rate = mode->clock * 1000;
|
|
ref = clk_round_rate(clk, rate);
|
|
div = DIV_ROUND_UP(ref, rate);
|
|
if (div < 1)
|
|
div = 1;
|
|
|
|
clk_set_rate(clk, ref);
|
|
*sclk = div | SCLK_510_EXTCLK1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void armada510_crtc_disable(struct armada_crtc *dcrtc)
|
|
{
|
|
if (!IS_ERR(dcrtc->clk)) {
|
|
clk_disable_unprepare(dcrtc->clk);
|
|
dcrtc->clk = ERR_PTR(-EINVAL);
|
|
}
|
|
}
|
|
|
|
static void armada510_crtc_enable(struct armada_crtc *dcrtc,
|
|
const struct drm_display_mode *mode)
|
|
{
|
|
if (IS_ERR(dcrtc->clk)) {
|
|
dcrtc->clk = dcrtc->extclk[0];
|
|
WARN_ON(clk_prepare_enable(dcrtc->clk));
|
|
}
|
|
}
|
|
|
|
const struct armada_variant armada510_ops = {
|
|
.has_spu_adv_reg = true,
|
|
.init = armada510_crtc_init,
|
|
.compute_clock = armada510_crtc_compute_clock,
|
|
.disable = armada510_crtc_disable,
|
|
.enable = armada510_crtc_enable,
|
|
};
|