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96f60e37 RK |
1 | /* |
2 | * Copyright (C) 2012 Russell King | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * Armada 510 (aka Dove) variant support | |
9 | */ | |
10 | #include <linux/clk.h> | |
11 | #include <linux/io.h> | |
96f60e37 RK |
12 | #include <drm/drm_crtc_helper.h> |
13 | #include "armada_crtc.h" | |
14 | #include "armada_drm.h" | |
15 | #include "armada_hw.h" | |
16 | ||
3ecea269 | 17 | static int armada510_crtc_init(struct armada_crtc *dcrtc, struct device *dev) |
96f60e37 | 18 | { |
3ecea269 | 19 | struct clk *clk; |
96f60e37 | 20 | |
fe424872 | 21 | clk = devm_clk_get(dev, "ext_ref_clk1"); |
3ecea269 RK |
22 | if (IS_ERR(clk)) |
23 | return PTR_ERR(clk) == -ENOENT ? -EPROBE_DEFER : PTR_ERR(clk); | |
96f60e37 | 24 | |
3ecea269 | 25 | dcrtc->extclk[0] = clk; |
96f60e37 | 26 | |
96f60e37 RK |
27 | /* Lower the watermark so to eliminate jitter at higher bandwidths */ |
28 | armada_updatel(0x20, (1 << 11) | 0xff, dcrtc->base + LCD_CFG_RDREG4F); | |
3ecea269 | 29 | |
4e4b3563 RK |
30 | /* Initialise SPU register */ |
31 | writel_relaxed(ADV_HWC32ENABLE | ADV_HWC32ARGB | ADV_HWC32BLEND, | |
32 | dcrtc->base + LCD_SPU_ADV_REG); | |
33 | ||
96f60e37 RK |
34 | return 0; |
35 | } | |
36 | ||
37 | /* | |
38 | * Armada510 specific SCLK register selection. | |
39 | * This gets called with sclk = NULL to test whether the mode is | |
40 | * supportable, and again with sclk != NULL to set the clocks up for | |
41 | * that. The former can return an error, but the latter is expected | |
42 | * not to. | |
43 | * | |
44 | * We currently are pretty rudimentary here, always selecting | |
45 | * EXT_REF_CLK_1 for LCD0 and erroring LCD1. This needs improvement! | |
46 | */ | |
47 | static int armada510_crtc_compute_clock(struct armada_crtc *dcrtc, | |
48 | const struct drm_display_mode *mode, uint32_t *sclk) | |
49 | { | |
3ecea269 | 50 | struct clk *clk = dcrtc->extclk[0]; |
96f60e37 RK |
51 | int ret; |
52 | ||
53 | if (dcrtc->num == 1) | |
54 | return -EINVAL; | |
55 | ||
56 | if (IS_ERR(clk)) | |
57 | return PTR_ERR(clk); | |
58 | ||
59 | if (dcrtc->clk != clk) { | |
60 | ret = clk_prepare_enable(clk); | |
61 | if (ret) | |
62 | return ret; | |
63 | dcrtc->clk = clk; | |
64 | } | |
65 | ||
66 | if (sclk) { | |
67 | uint32_t rate, ref, div; | |
68 | ||
69 | rate = mode->clock * 1000; | |
70 | ref = clk_round_rate(clk, rate); | |
71 | div = DIV_ROUND_UP(ref, rate); | |
72 | if (div < 1) | |
73 | div = 1; | |
74 | ||
75 | clk_set_rate(clk, ref); | |
76 | *sclk = div | SCLK_510_EXTCLK1; | |
77 | } | |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
82 | const struct armada_variant armada510_ops = { | |
83 | .has_spu_adv_reg = true, | |
42e62ba7 RK |
84 | .init = armada510_crtc_init, |
85 | .compute_clock = armada510_crtc_compute_clock, | |
96f60e37 | 86 | }; |