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Message-ID: <97823682-77b0-8db9-0ed6-3f86bcc296c2@amd.com>
Date: Fri, 25 Mar 2022 10:45:33 -0400
From: Harry Wentland <harry.wentland@....com>
To: Ryan Lin <tsung-hua.lin@....com>, sunpeng.li@....com,
alexander.deucher@....com, christian.koenig@....com,
David1.Zhou@....com, airlied@...ux.ie, daniel@...ll.ch,
seanpaul@...omium.org, bas@...nieuwenhuizen.nl,
nicholas.kazlauskas@....com, sashal@...nel.org,
markyacoub@...gle.com, victorchengchi.lu@....com,
ching-shih.li@....corp-partner.google.com,
Rodrigo.Siqueira@....com, ddavenport@...omium.org,
amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, leon.li@....com
Subject: Re: [PATCH v2 3/25] drm/amdgpu: Disable ABM when AC mode
On 2022-03-25 00:05, Ryan Lin wrote:
> Disable ABM feature when the system is running on AC mode to get
> the more perfect contrast of the display.
It says patch 3 out of 25. Are there other patches? If so, I can't
find them in my mailbox and neither can patchwork
https://patchwork.freedesktop.org/series/101767/
> Signed-off-by: Ryan Lin <tsung-hua.lin@....com>
>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c | 4 ++
> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 1 +
> drivers/gpu/drm/amd/display/dc/dce/dmub_abm.c | 58 ++++++++++++-------
> drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h | 1 +
> 4 files changed, 42 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
> index c560c1ab62ecb..bc8bb9aad2e36 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
> @@ -822,6 +822,10 @@ static int amdgpu_acpi_event(struct notifier_block *nb,
> struct amdgpu_device *adev = container_of(nb, struct amdgpu_device, acpi_nb);
> struct acpi_bus_event *entry = (struct acpi_bus_event *)data;
>
> + if (strcmp(entry->device_class, "battery") == 0) {
> + adev->pm.ac_power = power_supply_is_system_supplied() > 0;
> + }
> +
> if (strcmp(entry->device_class, ACPI_AC_CLASS) == 0) {
> if (power_supply_is_system_supplied() > 0)
> DRM_DEBUG_DRIVER("pm: AC\n");
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index abfcc1304ba0c..3a0afe7602727 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -3454,6 +3454,7 @@ int amdgpu_device_init(struct amdgpu_device *adev,
>
> adev->gfx.gfx_off_req_count = 1;
> adev->pm.ac_power = power_supply_is_system_supplied() > 0;
> + adev->pm.old_ac_power = true;
>
> atomic_set(&adev->throttling_logging_enabled, 1);
> /*
> diff --git a/drivers/gpu/drm/amd/display/dc/dce/dmub_abm.c b/drivers/gpu/drm/amd/display/dc/dce/dmub_abm.c
> index 54a1408c8015c..478a734b66926 100644
> --- a/drivers/gpu/drm/amd/display/dc/dce/dmub_abm.c
> +++ b/drivers/gpu/drm/amd/display/dc/dce/dmub_abm.c
> @@ -23,6 +23,8 @@
> *
> */
>
> +#include <linux/power_supply.h>
> +#include "amdgpu.h"
> #include "dmub_abm.h"
> #include "dce_abm.h"
> #include "dc.h"
> @@ -51,6 +53,7 @@
> #define DISABLE_ABM_IMMEDIATELY 255
>
>
> +extern uint amdgpu_dm_abm_level;
>
> static void dmub_abm_enable_fractional_pwm(struct dc_context *dc)
> {
> @@ -117,28 +120,6 @@ static void dmub_abm_init(struct abm *abm, uint32_t backlight)
> dmub_abm_enable_fractional_pwm(abm->ctx);
> }
>
> -static unsigned int dmub_abm_get_current_backlight(struct abm *abm)
> -{
> - struct dce_abm *dce_abm = TO_DMUB_ABM(abm);
> - unsigned int backlight = REG_READ(BL1_PWM_CURRENT_ABM_LEVEL);
> -
> - /* return backlight in hardware format which is unsigned 17 bits, with
> - * 1 bit integer and 16 bit fractional
> - */
> - return backlight;
> -}
> -
> -static unsigned int dmub_abm_get_target_backlight(struct abm *abm)
> -{
> - struct dce_abm *dce_abm = TO_DMUB_ABM(abm);
> - unsigned int backlight = REG_READ(BL1_PWM_TARGET_ABM_LEVEL);
> -
> - /* return backlight in hardware format which is unsigned 17 bits, with
> - * 1 bit integer and 16 bit fractional
> - */
> - return backlight;
> -}
> -
> static bool dmub_abm_set_level(struct abm *abm, uint32_t level)
> {
> union dmub_rb_cmd cmd;
> @@ -148,6 +129,9 @@ static bool dmub_abm_set_level(struct abm *abm, uint32_t level)
> int edp_num;
> uint8_t panel_mask = 0;
>
> + if (power_supply_is_system_supplied() > 0)
> + level = 0;
> +
> get_edp_links(dc->dc, edp_links, &edp_num);
>
> for (i = 0; i < edp_num; i++) {
> @@ -170,6 +154,36 @@ static bool dmub_abm_set_level(struct abm *abm, uint32_t level)
> return true;
> }
>
> +static unsigned int dmub_abm_get_current_backlight(struct abm *abm)
> +{
> + struct dce_abm *dce_abm = TO_DMUB_ABM(abm);
> + unsigned int backlight = REG_READ(BL1_PWM_CURRENT_ABM_LEVEL);
> + struct dc_context *dc = abm->ctx;
> + struct amdgpu_device *adev = dc->driver_context;
> +
> + if (adev->pm.ac_power != adev->pm.old_ac_power) {
This file lives in DC, which is shared code between Windows and Linux. We
cannot directly use adev here. Any information needs to go through DC structs.
I seem to remember someone saying that ABM gets disabled on Windows when
we're in AC mode. Have you checked with our Windows guys about this? I feel
we're re-inventing the wheel here for no good reason.
Harry
> + dmub_abm_set_level(abm, amdgpu_dm_abm_level);
> + adev->pm.ac_power = power_supply_is_system_supplied() > 0;
> + adev->pm.old_ac_power = adev->pm.ac_power;
> + }
> +
> + /* return backlight in hardware format which is unsigned 17 bits, with
> + * 1 bit integer and 16 bit fractional
> + */
> + return backlight;
> +}
> +
> +static unsigned int dmub_abm_get_target_backlight(struct abm *abm)
> +{
> + struct dce_abm *dce_abm = TO_DMUB_ABM(abm);
> + unsigned int backlight = REG_READ(BL1_PWM_TARGET_ABM_LEVEL);
> +
> + /* return backlight in hardware format which is unsigned 17 bits, with
> + * 1 bit integer and 16 bit fractional
> + */
> + return backlight;
> +}
> +
> static bool dmub_abm_init_config(struct abm *abm,
> const char *src,
> unsigned int bytes,
> diff --git a/drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h b/drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h
> index f6e0e7d8a0077..de459411a0e83 100644
> --- a/drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h
> +++ b/drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h
> @@ -445,6 +445,7 @@ struct amdgpu_pm {
> uint32_t smu_prv_buffer_size;
> struct amdgpu_bo *smu_prv_buffer;
> bool ac_power;
> + bool old_ac_power;
> /* powerplay feature */
> uint32_t pp_feature;
>
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