From deb072d241c906ae378bc88ff91dfcdc34ebe71a Mon Sep 17 00:00:00 2001 From: Timur Kristóf Date: Fri, 26 Sep 2025 20:01:51 +0200 Subject: drm/amd/display: Implement DCE analog stream encoders MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add analog stream encoders for DCE which will be used when connecting an analog display through VGA or DVI-I. Considering that all stream encoder functions currently deal with digital streams, there is nothing for an analog stream encoder to do, making them basically a no-op. That being said, we still need some kind of stream encoder to represent an analog stream, and it is beneficial to split them from digital stream encoders in the code to make sure they don't accidentally write any DIG* registers. On supported chips there is currently up to 1 analog encoder, which is DACA. There are references to DACB in some code such as VBIOS commands and register files but it seems to be not present on DCE 6 and newer. Set num_analog_stream_encoder = 1 so that we can support the analog connectors on DCE 6-10, for now. Signed-off-by: Timur Kristóf Reviewed-by: Harry Wentland Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/dc/resource/dce100/dce100_resource.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'drivers/gpu/drm/amd/display/dc/resource/dce100') diff --git a/drivers/gpu/drm/amd/display/dc/resource/dce100/dce100_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dce100/dce100_resource.c index 7573f5130ea9..3856477981c6 100644 --- a/drivers/gpu/drm/amd/display/dc/resource/dce100/dce100_resource.c +++ b/drivers/gpu/drm/amd/display/dc/resource/dce100/dce100_resource.c @@ -375,6 +375,7 @@ static const struct bios_registers bios_regs = { static const struct resource_caps res_cap = { .num_timing_generator = 6, .num_audio = 6, + .num_analog_stream_encoder = 1, .num_stream_encoder = 6, .num_pll = 3, .num_ddc = 6, @@ -486,6 +487,11 @@ static struct stream_encoder *dce100_stream_encoder_create( if (!enc110) return NULL; + if (eng_id == ENGINE_ID_DACA || eng_id == ENGINE_ID_DACB) { + dce110_analog_stream_encoder_construct(enc110, ctx, ctx->dc_bios, eng_id); + return &enc110->base; + } + dce110_stream_encoder_construct(enc110, ctx, ctx->dc_bios, eng_id, &stream_enc_regs[eng_id], &se_shift, &se_mask); return &enc110->base; -- cgit v1.2.3