diff mbox series

[v12,1/9] drm/display/dsc: Add flatness and initial scale value calculations

Message ID 20230329-rfc-msm-dsc-helper-v12-1-9cdb7401f614@quicinc.com (mailing list archive)
State Superseded
Headers show
Series Introduce MSM-specific DSC helpers | expand

Commit Message

Jessica Zhang May 17, 2023, 10:27 p.m. UTC 
Add helpers to calculate det_thresh_flatness and initial_scale_value as
these calculations are defined within the DSC spec.

Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
---
 include/drm/display/drm_dsc_helper.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

Comments

Dmitry Baryshkov May 18, 2023, 12:37 a.m. UTC | #1 
On 18/05/2023 01:27, Jessica Zhang wrote:
> Add helpers to calculate det_thresh_flatness and initial_scale_value as
> these calculations are defined within the DSC spec.
> 
> Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
> Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
> ---
>   include/drm/display/drm_dsc_helper.h | 10 ++++++++++
>   1 file changed, 10 insertions(+)

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Jani Nikula May 22, 2023, 9:37 a.m. UTC | #2 
On Wed, 17 May 2023, Jessica Zhang <quic_jesszhan@quicinc.com> wrote:
> Add helpers to calculate det_thresh_flatness and initial_scale_value as
> these calculations are defined within the DSC spec.
>
> Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
> Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
> ---
>  include/drm/display/drm_dsc_helper.h | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/include/drm/display/drm_dsc_helper.h b/include/drm/display/drm_dsc_helper.h
> index fc2104415dcb..753b0034eda7 100644
> --- a/include/drm/display/drm_dsc_helper.h
> +++ b/include/drm/display/drm_dsc_helper.h
> @@ -25,5 +25,15 @@ void drm_dsc_set_rc_buf_thresh(struct drm_dsc_config *vdsc_cfg);
>  int drm_dsc_setup_rc_params(struct drm_dsc_config *vdsc_cfg, enum drm_dsc_params_type type);
>  int drm_dsc_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg);
>  
> +static inline u8 drm_dsc_initial_scale_value(const struct drm_dsc_config *dsc)
> +{
> +	return 8 * dsc->rc_model_size / (dsc->rc_model_size - dsc->initial_offset);
> +}
> +
> +static inline u32 drm_dsc_flatness_det_thresh(const struct drm_dsc_config *dsc)
> +{
> +	return 2 << (dsc->bits_per_component - 8);
> +}

kernel-doc? Maybe make them regular functions instead of static inline?

BR,
Jani.

> +
>  #endif /* _DRM_DSC_HELPER_H_ */
Jessica Zhang May 22, 2023, 9:15 p.m. UTC | #3 
On 5/22/2023 2:37 AM, Jani Nikula wrote:
> On Wed, 17 May 2023, Jessica Zhang <quic_jesszhan@quicinc.com> wrote:
>> Add helpers to calculate det_thresh_flatness and initial_scale_value as
>> these calculations are defined within the DSC spec.
>>
>> Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
>> Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
>> ---
>>   include/drm/display/drm_dsc_helper.h | 10 ++++++++++
>>   1 file changed, 10 insertions(+)
>>
>> diff --git a/include/drm/display/drm_dsc_helper.h b/include/drm/display/drm_dsc_helper.h
>> index fc2104415dcb..753b0034eda7 100644
>> --- a/include/drm/display/drm_dsc_helper.h
>> +++ b/include/drm/display/drm_dsc_helper.h
>> @@ -25,5 +25,15 @@ void drm_dsc_set_rc_buf_thresh(struct drm_dsc_config *vdsc_cfg);
>>   int drm_dsc_setup_rc_params(struct drm_dsc_config *vdsc_cfg, enum drm_dsc_params_type type);
>>   int drm_dsc_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg);
>>   
>> +static inline u8 drm_dsc_initial_scale_value(const struct drm_dsc_config *dsc)
>> +{
>> +	return 8 * dsc->rc_model_size / (dsc->rc_model_size - dsc->initial_offset);
>> +}
>> +
>> +static inline u32 drm_dsc_flatness_det_thresh(const struct drm_dsc_config *dsc)
>> +{
>> +	return 2 << (dsc->bits_per_component - 8);
>> +}
> 
> kernel-doc?

Hi Jani,

Sure, I'll add kernel docs for these.

> Maybe make them regular functions instead of static inline?

I was under the impression that smaller/single-line functions were good 
candidates for inlining. However, if you have a strong preference for 
having these as regular functions, I'm ok with that too.

Thanks,

Jessica Zhang

> 
> BR,
> Jani.
> 
>> +
>>   #endif /* _DRM_DSC_HELPER_H_ */
> 
> -- 
> Jani Nikula, Intel Open Source Graphics Center
diff mbox series

Patch

diff --git a/include/drm/display/drm_dsc_helper.h b/include/drm/display/drm_dsc_helper.h
index fc2104415dcb..753b0034eda7 100644
--- a/include/drm/display/drm_dsc_helper.h
+++ b/include/drm/display/drm_dsc_helper.h
@@ -25,5 +25,15 @@  void drm_dsc_set_rc_buf_thresh(struct drm_dsc_config *vdsc_cfg);
 int drm_dsc_setup_rc_params(struct drm_dsc_config *vdsc_cfg, enum drm_dsc_params_type type);
 int drm_dsc_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg);
 
+static inline u8 drm_dsc_initial_scale_value(const struct drm_dsc_config *dsc)
+{
+	return 8 * dsc->rc_model_size / (dsc->rc_model_size - dsc->initial_offset);
+}
+
+static inline u32 drm_dsc_flatness_det_thresh(const struct drm_dsc_config *dsc)
+{
+	return 2 << (dsc->bits_per_component - 8);
+}
+
 #endif /* _DRM_DSC_HELPER_H_ */