[d-kernel] [PATCH 23/32] drm/bridge: dw-hdmi: force ahb audio register offset for Baikal-M

[Alexey Sheplyakov <asheplyakov@basealt.ru>]

Hardware revision 0x2a needs a register offset. It can't be
auto-detected: to figure out the hardware revision one need
to read HDMI_REVISION_ID register, and to read a register
one need to know the register offset shift. Hence the correct
register offset shift has to be specified in the device tree
(supplied by UEFI firmware). Alas the device tree blob passed
by Baikal-M UEFI does not contain this regshift. Hence force
the correct regshift for Baikal-M.

Signed-off-by: Alexey Sheplyakov <asheplyakov@basealt.ru>
X-DONTUPSTREAM
X-feature-Baikal-M
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 49612efe0f1d..161a0105d18c 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -3577,6 +3577,11 @@ struct dw_hdmi *dw_hdmi_probe(struct platform_device *pdev,
 		} else {
 			dev_dbg(dev, "set audio.regshift=%u from DTB\n", audio.regshift);
 		}
+		if (of_device_is_compatible(np, "baikal,hdmi")) {
+			audio.regshift = 2;
+			dev_info(dev, "setting audio.regshift=%d for BE-M1000 SoC\n",
+				 audio.regshift);
+		}
 		hdmi->enable_audio = dw_hdmi_ahb_audio_enable;
 		hdmi->disable_audio = dw_hdmi_ahb_audio_disable;
 
-- 
2.33.5