[PATCH 11/22] drm/amd/display: Disable phantom OTG after enable for plane disable
Liu, HaoPing (Alan)
HaoPing.Liu at amd.com
Thu Nov 10 17:35:05 UTC 2022
[AMD Official Use Only - General]
Hi Nathan,
Thanks for reporting this issue.
Hi Alvin,
Please see inline.
-----Original Message-----
From: Nathan Chancellor <nathan at kernel.org>
Sent: Thursday, November 10, 2022 11:39 PM
To: Liu, HaoPing (Alan) <HaoPing.Liu at amd.com>
Cc: amd-gfx at lists.freedesktop.org; Wang, Chao-kai (Stylon) <Stylon.Wang at amd.com>; Li, Sun peng (Leo) <Sunpeng.Li at amd.com>; Wentland, Harry <Harry.Wentland at amd.com>; Zhuo, Qingqing (Lillian) <Qingqing.Zhuo at amd.com>; Siqueira, Rodrigo <Rodrigo.Siqueira at amd.com>; Li, Roman <Roman.Li at amd.com>; Chiu, Solomon <Solomon.Chiu at amd.com>; Pillai, Aurabindo <Aurabindo.Pillai at amd.com>; Lee, Alvin <Alvin.Lee2 at amd.com>; Lin, Wayne <Wayne.Lin at amd.com>; Lei, Jun <Jun.Lei at amd.com>; Lakha, Bhawanpreet <Bhawanpreet.Lakha at amd.com>; Gutierrez, Agustin <Agustin.Gutierrez at amd.com>; Kotarac, Pavle <Pavle.Kotarac at amd.com>
Subject: Re: [PATCH 11/22] drm/amd/display: Disable phantom OTG after enable for plane disable
Hi Alan,
On Thu, Nov 03, 2022 at 12:01:06AM +0800, Alan Liu wrote:
> From: Alvin Lee <Alvin.Lee2 at amd.com>
>
> [Description]
> - Need to disable phantom OTG after it's enabled
> in order to restore it to it's original state.
> - If it's enabled and then an MCLK switch comes in
> we may not prefetch the correct data since the phantom
> OTG could already be in the middle of the frame.
>
> Reviewed-by: Jun Lei <Jun.Lei at amd.com>
> Acked-by: Alan Liu <HaoPing.Liu at amd.com>
> Signed-off-by: Alvin Lee <Alvin.Lee2 at amd.com>
> ---
> drivers/gpu/drm/amd/display/dc/core/dc.c | 14 +++++++++++++-
> drivers/gpu/drm/amd/display/dc/dcn32/dcn32_optc.c | 8 ++++++++
> .../drm/amd/display/dc/inc/hw/timing_generator.h | 1 +
> 3 files changed, 22 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c
> b/drivers/gpu/drm/amd/display/dc/core/dc.c
> index da808996e21d..9c3704c4d7e4 100644
> --- a/drivers/gpu/drm/amd/display/dc/core/dc.c
> +++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
> @@ -1055,6 +1055,7 @@ static void disable_dangling_plane(struct dc *dc, struct dc_state *context)
> struct dc_state *dangling_context = dc_create_state(dc);
> struct dc_state *current_ctx;
> struct pipe_ctx *pipe;
> + struct timing_generator *tg;
>
> if (dangling_context == NULL)
> return;
> @@ -1098,6 +1099,7 @@ static void disable_dangling_plane(struct dc
> *dc, struct dc_state *context)
>
> if (should_disable && old_stream) {
> pipe = &dc->current_state->res_ctx.pipe_ctx[i];
> + tg = pipe->stream_res.tg;
> /* When disabling plane for a phantom pipe, we must turn on the
> * phantom OTG so the disable programming gets the double buffer
> * update. Otherwise the pipe will be left in a partially disabled
> @@ -1105,7 +1107,8 @@ static void disable_dangling_plane(struct dc *dc, struct dc_state *context)
> * again for different use.
> */
> if (old_stream->mall_stream_config.type == SUBVP_PHANTOM) {
> - pipe->stream_res.tg->funcs->enable_crtc(pipe->stream_res.tg);
> + if (tg->funcs->enable_crtc)
> + tg->funcs->enable_crtc(tg);
> }
> dc_rem_all_planes_for_stream(dc, old_stream, dangling_context);
> disable_all_writeback_pipes_for_stream(dc, old_stream,
> dangling_context); @@ -1122,6 +1125,15 @@ static void disable_dangling_plane(struct dc *dc, struct dc_state *context)
> dc->hwss.interdependent_update_lock(dc, dc->current_state, false);
> dc->hwss.post_unlock_program_front_end(dc, dangling_context);
> }
> + /* We need to put the phantom OTG back into it's default (disabled) state or we
> + * can get corruption when transition from one SubVP config to a different one.
> + * The OTG is set to disable on falling edge of VUPDATE so the plane disable
> + * will still get it's double buffer update.
> + */
> + if (old_stream->mall_stream_config.type == SUBVP_PHANTOM) {
> + if (tg->funcs->disable_phantom_crtc)
> + tg->funcs->disable_phantom_crtc(tg);
> + }
> }
> }
>
> diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_optc.c
> b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_optc.c
> index 2b33eeb213e2..2ee798965bc2 100644
> --- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_optc.c
> +++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_optc.c
> @@ -167,6 +167,13 @@ static void optc32_phantom_crtc_post_enable(struct timing_generator *optc)
> REG_WAIT(OTG_CLOCK_CONTROL, OTG_BUSY, 0, 1, 100000); }
>
> +static void optc32_disable_phantom_otg(struct timing_generator *optc)
> +{
> + struct optc *optc1 = DCN10TG_FROM_TG(optc);
> +
> + REG_UPDATE(OTG_CONTROL, OTG_MASTER_EN, 0); }
> +
> static void optc32_set_odm_bypass(struct timing_generator *optc,
> const struct dc_crtc_timing *dc_crtc_timing) { @@ -260,6 +267,7 @@
> static struct timing_generator_funcs dcn32_tg_funcs = {
> .enable_crtc = optc32_enable_crtc,
> .disable_crtc = optc32_disable_crtc,
> .phantom_crtc_post_enable = optc32_phantom_crtc_post_enable,
> + .disable_phantom_crtc = optc32_disable_phantom_otg,
> /* used by enable_timing_synchronization. Not need for FPGA */
> .is_counter_moving = optc1_is_counter_moving,
> .get_position = optc1_get_position, diff --git
> a/drivers/gpu/drm/amd/display/dc/inc/hw/timing_generator.h
> b/drivers/gpu/drm/amd/display/dc/inc/hw/timing_generator.h
> index 65f18f9dad34..43eb61961e0f 100644
> --- a/drivers/gpu/drm/amd/display/dc/inc/hw/timing_generator.h
> +++ b/drivers/gpu/drm/amd/display/dc/inc/hw/timing_generator.h
> @@ -184,6 +184,7 @@ struct timing_generator_funcs {
> bool (*disable_crtc)(struct timing_generator *tg); #ifdef
> CONFIG_DRM_AMD_DC_DCN
> void (*phantom_crtc_post_enable)(struct timing_generator *tg);
> + void (*disable_phantom_crtc)(struct timing_generator *tg);
Hi @Lee, Alvin
I think we should move the above line out of #define CONFIG_DRM_AMD_DC_DCN, right?
Thanks.
> #endif
> bool (*immediate_disable_crtc)(struct timing_generator *tg);
> bool (*is_counter_moving)(struct timing_generator *tg);
> --
> 2.25.1
>
>
This breaks the build without CONFIG_DRM_AMD_DC_DCN:
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:1134:20: error: no member named 'disable_phantom_crtc' in 'struct timing_generator_funcs'
if (tg->funcs->disable_phantom_crtc)
~~~~~~~~~ ^
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:1135:17: error: no member named 'disable_phantom_crtc' in 'struct timing_generator_funcs'
tg->funcs->disable_phantom_crtc(tg);
~~~~~~~~~ ^
2 errors generated.
Cheers,
Nathan
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