RE: fsl-dcu not works on latest "drm-next"

From: Meng Yi
Date: Thu May 26 2016 - 04:39:18 EST

Hi Mark,

> You've not specifically described the problem here - what are the endiannesses
> of both the CPU and the device you're talking to? What specifically is the
> endianess problem you are seeing, what are you seeing and what do you
> expect to see?

The CPU is little endian and the device DCU is big endian, specified big-endian in DTS,

And here is my DTS and regmap_config,

Specified "big-endian" in DTS,

dcu: dcu@2ce0000 {
compatible = "fsl,ls1021a-dcu";
reg = <0x0 0x2ce0000 0x0 0x10000>;
interrupts = <GIC_SPI 172 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&platform_clk 0>;
clock-names = "dcu";
status = "disabled";

I can't tell the difference of "reg_format_endian" and " val_format_endian ", so I had tried four conditions. And all failed.

static const struct regmap_config fsl_dcu_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
.cache_type = REGCACHE_RBTREE,
// .reg_format_endian = REGMAP_ENDIAN_BIG, // .val_format_endian = REGMAP_ENDIAN_BIG,

.volatile_reg = fsl_dcu_drm_is_volatile_reg, };

I expect that regmap write as big endian, and I am seeing is regmap write as little endian.

Best Regards,
Meng Yi