[AMD Official Use Only]
Hi Christian,
There is already a string comparison in the same function. I just reference that to port this solution.
#define ACPI_AC_CLASS "ac_adapter"
static int amdgpu_acpi_event(struct notifier_block *nb,
unsigned long val,
void *data)
{
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) { <-------------------here!
if (power_supply_is_system_supplied() > 0)
DRM_DEBUG_DRIVER("pm: AC\n");
else
DRM_DEBUG_DRIVER("pm: DC\n");
amdgpu_pm_acpi_event_handler(adev);
}
/* Check for pending SBIOS requests */
return amdgpu_atif_handler(adev, entry);
}
Thanks,
Ryan Lin.
-----Original Message-----
From: Koenig, Christian <Christian.Koenig@xxxxxxx>
Sent: Friday, March 25, 2022 2:58 PM
To: Lin, Tsung-hua (Ryan) <Tsung-hua.Lin@xxxxxxx>; Wentland, Harry <Harry.Wentland@xxxxxxx>; Li, Sun peng (Leo) <Sunpeng.Li@xxxxxxx>; Deucher, Alexander <Alexander.Deucher@xxxxxxx>; David1.Zhou@xxxxxxx; airlied@xxxxxxxx; daniel@xxxxxxxx; seanpaul@xxxxxxxxxxxx; bas@xxxxxxxxxxxxxxxxxxx; Kazlauskas, Nicholas <Nicholas.Kazlauskas@xxxxxxx>; sashal@xxxxxxxxxx; markyacoub@xxxxxxxxxx; victorchengchi.lu@xxxxxxx; ching-shih.li@xxxxxxxxxxxxxxxxxxxxxxxxxxx; Siqueira, Rodrigo <Rodrigo.Siqueira@xxxxxxx>; ddavenport@xxxxxxxxxxxx; amd-gfx@xxxxxxxxxxxxxxxxxxxxx; dri-devel@xxxxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Li, Leon <Leon.Li@xxxxxxx>
Subject: Re: [PATCH v2 3/25] drm/amdgpu: Disable ABM when AC mode
Am 25.03.22 um 05:05 schrieb Ryan Lin:
> Disable ABM feature when the system is running on AC mode to get the
> more perfect contrast of the display.
>
> Signed-off-by: Ryan Lin <tsung-hua.lin@xxxxxxx>
>
> ---
> 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) {
String comparison in a hot path is not something we usually like to see in the kernel.
Isn't there any other way to detect that? Like a flag or similar?
Regards,
Christian.
> + 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) {
> + 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;
>
