Re: [PATCH 2/3] drm: bridge: it66121: Fix the register page length

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On 16/03/2022 14:57, Nicolas Belin wrote:
Set the register page length or window length to
0x100 according to the documentation.

Fixes: 988156dc2fc9 ("drm: bridge: add it66121 driver")
Signed-off-by: Nicolas Belin <nbelin@xxxxxxxxxxxx>
---
  drivers/gpu/drm/bridge/ite-it66121.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/ite-it66121.c b/drivers/gpu/drm/bridge/ite-it66121.c
index 06b59b422c69..64912b770086 100644
--- a/drivers/gpu/drm/bridge/ite-it66121.c
+++ b/drivers/gpu/drm/bridge/ite-it66121.c
@@ -227,7 +227,7 @@ static const struct regmap_range_cfg it66121_regmap_banks[] = {
  		.selector_mask = 0x1,
  		.selector_shift = 0,
  		.window_start = 0x00,
-		.window_len = 0x130,
+		.window_len = 0x100,
  	},
  };

The documentation we have access to at [1] is confusing:
Reg00 ~ Reg2F are accessible in any register bank.
Reg30~ RegFF are accessible in register bank0
Reg130~ Reg1BF are accessible in register bank1. These are HDMI packet registers.

But indeed it means:
- Reg00 ~ Reg2F: are always accessible, whether bank0 or bank1 is set
- Reg30~ RegFF: only when bank0 is set
- Reg130~ Reg1BF: only when bank0 is set at Reg30~ RegF range

So 0x100 is the right window_len here.

Acked-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>

[1] https://rockchip.fr/radxa/IT66121_Register_List_Release_V1.0.pdf



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