mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-30 08:02:30 +00:00
e08015e7d6
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+
|
|
#include <linux/device.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/mfd/syscon.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/module.h>
|
|
#include "pl111_nomadik.h"
|
|
|
|
#define PMU_CTRL_OFFSET 0x0000
|
|
#define PMU_CTRL_LCDNDIF BIT(26)
|
|
|
|
void pl111_nomadik_init(struct device *dev)
|
|
{
|
|
struct regmap *pmu_regmap;
|
|
|
|
/*
|
|
* Just bail out of this is not found, we could be running
|
|
* multiplatform on something else than Nomadik.
|
|
*/
|
|
pmu_regmap =
|
|
syscon_regmap_lookup_by_compatible("stericsson,nomadik-pmu");
|
|
if (IS_ERR(pmu_regmap))
|
|
return;
|
|
|
|
/*
|
|
* This bit in the PMU controller multiplexes the two graphics
|
|
* blocks found in the Nomadik STn8815. The other one is called
|
|
* MDIF (Master Display Interface) and gets muxed out here.
|
|
*/
|
|
regmap_update_bits(pmu_regmap,
|
|
PMU_CTRL_OFFSET,
|
|
PMU_CTRL_LCDNDIF,
|
|
0);
|
|
dev_info(dev, "set Nomadik PMU mux to CLCD mode\n");
|
|
}
|
|
EXPORT_SYMBOL_GPL(pl111_nomadik_init);
|