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The Nomadik has a variant of the PL110 known as "Color LCD Controller" LCDC. This variant has the same bit ordering as the DRM subsystem (in difference from the other variants) and adds a few bits for the control of 5551, 565 etc in the control register. Notably it also adds a packed RGB888 24BPP mode. We add support by detecting this variant and also adding a small plug-in that will mux the LCDC out if the ASIC happens to be muxed to the other graphics controller (they are mutually exclusive). Reviewed-by: Eric Anholt <eric@anholt.net> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20180621184450.25377-1-linus.walleij@linaro.org
36 lines
955 B
C
36 lines
955 B
C
// SPDX-License-Identifier: GPL-2.0+
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#include <linux/device.h>
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#include <linux/regmap.h>
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#include <linux/mfd/syscon.h>
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#include <linux/bitops.h>
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#include <linux/module.h>
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#include "pl111_nomadik.h"
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#define PMU_CTRL_OFFSET 0x0000
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#define PMU_CTRL_LCDNDIF BIT(26)
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void pl111_nomadik_init(struct device *dev)
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{
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struct regmap *pmu_regmap;
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/*
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* Just bail out of this is not found, we could be running
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* multiplatform on something else than Nomadik.
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*/
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pmu_regmap =
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syscon_regmap_lookup_by_compatible("stericsson,nomadik-pmu");
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if (IS_ERR(pmu_regmap))
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return;
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/*
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* This bit in the PMU controller multiplexes the two graphics
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* blocks found in the Nomadik STn8815. The other one is called
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* MDIF (Master Display Interface) and gets muxed out here.
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*/
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regmap_update_bits(pmu_regmap,
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PMU_CTRL_OFFSET,
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PMU_CTRL_LCDNDIF,
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0);
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dev_info(dev, "set Nomadik PMU mux to CLCD mode\n");
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}
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EXPORT_SYMBOL_GPL(pl111_nomadik_init);
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