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drm/amd/display: Turn off DAC in DCE link encoder using VBIOS

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Apparently, the VBIOS DAC1EncoderControl function is much more
graceful about turning off the DAC. It writes various DAC
registers in a specific sequence. Use that instead of just
clearing the DAC_ENABLE register.

Do this in just the dce110_link_encoder_disable_output
function and remove it from the HWSS.

Fixes: 0fbe321a93 ("drm/amd/display: Implement DCE analog link encoders (v2)")
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Tested-by: Mauro Rossi <issor.oruam@gmail.com>
Suggested-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Timur Kristóf 2026-02-02 12:25:04 +01:00 committed by Alex Deucher
parent 613b1737ab
commit e021ee9950
2 changed files with 17 additions and 16 deletions
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30
drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c
View File

@ -133,6 +133,21 @@ static enum bp_result link_transmitter_control(
return result;
}
static enum bp_result link_dac_encoder_control(
struct dce110_link_encoder *link_enc,
enum bp_encoder_control_action action,
uint32_t pix_clk_100hz)
{
struct dc_bios *bios = link_enc->base.ctx->dc_bios;
struct bp_encoder_control encoder_control = {0};
encoder_control.action = action;
encoder_control.engine_id = link_enc->base.analog_engine;
encoder_control.pixel_clock = pix_clk_100hz / 10;
return bios->funcs->encoder_control(bios, &encoder_control);
}
static void enable_phy_bypass_mode(
struct dce110_link_encoder *enc110,
bool enable)
@ -1345,19 +1360,8 @@ void dce110_link_encoder_disable_output(
struct bp_transmitter_control cntl = { 0 };
enum bp_result result;
switch (enc->analog_engine) {
case ENGINE_ID_DACA:
REG_UPDATE(DAC_ENABLE, DAC_ENABLE, 0);
break;
case ENGINE_ID_DACB:
/* DACB doesn't seem to be present on DCE6+,
* although there are references to it in the register file.
*/
DC_LOG_ERROR("%s DACB is unsupported\n", __func__);
break;
default:
break;
}
if (enc->analog_engine != ENGINE_ID_UNKNOWN)
link_dac_encoder_control(enc110, ENCODER_CONTROL_DISABLE, 0);
/* The code below only applies to connectors that support digital signals. */
if (enc->transmitter == TRANSMITTER_UNKNOWN)

3
drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c
View File

@ -1199,9 +1199,6 @@ void dce110_disable_stream(struct pipe_ctx *pipe_ctx)
dccg->funcs->disable_symclk_se(dccg, stream_enc->stream_enc_inst,
link_enc->transmitter - TRANSMITTER_UNIPHY_A);
}
if (dc_is_rgb_signal(pipe_ctx->stream->signal))
dce110_dac_encoder_control(pipe_ctx, false);
}
void dce110_unblank_stream(struct pipe_ctx *pipe_ctx,