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/linux/Documentation/admin-guide/pm/
H A Dcpufreq.rst7 CPU Performance Scaling
15 The Concept of CPU Performance Scaling
44 to as CPU performance scaling or CPU frequency scaling (because it involves
48 CPU Performance Scaling in Linux
51 The Linux kernel supports CPU performance scaling by means of the ``CPUFreq``
52 (CPU Frequency scaling) subsystem that consists of three layers of code: the
53 core, scaling governors and scaling drivers.
56 interfaces for all platforms that support CPU performance scaling. It defines
59 Scaling governors implement algorithms to estimate the required CPU capacity.
60 As a rule, each governor implements one, possibly parametrized, scaling
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/linux/arch/arm64/boot/dts/qcom/
H A Dpm7250b.dtsi112 qcom,pre-scaling = <1 1>;
118 qcom,pre-scaling = <1 1>;
124 qcom,pre-scaling = <1 1>;
130 qcom,pre-scaling = <1 1>;
136 qcom,pre-scaling = <1 16>;
142 qcom,pre-scaling = <1 1>;
149 qcom,pre-scaling = <1 1>;
155 qcom,pre-scaling = <1 6>;
162 qcom,pre-scaling = <1 1>;
169 qcom,pre-scaling = <1 3>;
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H A Dpm8950.dtsi63 qcom,pre-scaling = <1 1>;
69 qcom,pre-scaling = <1 1>;
75 qcom,pre-scaling = <1 1>;
81 qcom,pre-scaling = <1 1>;
87 qcom,pre-scaling = <1 1>;
93 qcom,pre-scaling = <1 1>;
109 qcom,pre-scaling = <1 1>;
117 qcom,pre-scaling = <1 1>;
125 qcom,pre-scaling = <1 1>;
133 qcom,pre-scaling = <1 1>;
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H A Dpmp8074.dtsi23 qcom,pre-scaling = <1 1>;
29 qcom,pre-scaling = <1 1>;
35 qcom,pre-scaling = <1 1>;
41 qcom,pre-scaling = <1 1>;
49 qcom,pre-scaling = <1 1>;
57 qcom,pre-scaling = <1 1>;
65 qcom,pre-scaling = <1 1>;
73 qcom,pre-scaling = <1 1>;
79 qcom,pre-scaling = <1 3>;
H A Dpm660.dtsi113 qcom,pre-scaling = <1 1>;
120 qcom,pre-scaling = <1 1>;
127 qcom,pre-scaling = <1 1>;
133 qcom,pre-scaling = <1 1>;
142 qcom,pre-scaling = <1 1>;
151 qcom,pre-scaling = <1 1>;
160 qcom,pre-scaling = <1 1>;
169 qcom,pre-scaling = <1 1>;
178 qcom,pre-scaling = <1 1>;
188 qcom,pre-scaling = <1 3>;
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H A Dpmi632.dtsi94 qcom,pre-scaling = <1 1>;
100 qcom,pre-scaling = <1 1>;
106 qcom,pre-scaling = <1 1>;
112 qcom,pre-scaling = <1 1>;
118 qcom,pre-scaling = <1 16>;
124 qcom,pre-scaling = <1 1>;
131 qcom,pre-scaling = <1 1>;
138 qcom,pre-scaling = <1 3>;
144 qcom,pre-scaling = <1 3>;
H A Dsc8180x-pmics.dtsi108 qcom,pre-scaling = <1 1>;
114 qcom,pre-scaling = <1 1>;
120 qcom,pre-scaling = <1 1>;
176 qcom,pre-scaling = <1 1>;
182 qcom,pre-scaling = <1 1>;
188 qcom,pre-scaling = <1 1>;
234 qcom,pre-scaling = <1 1>;
240 qcom,pre-scaling = <1 1>;
246 qcom,pre-scaling = <1 1>;
284 qcom,pre-scaling = <1 1>;
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H A Dpms405.dtsi85 qcom,pre-scaling = <1 1>;
91 qcom,pre-scaling = <1 1>;
97 qcom,pre-scaling = <1 3>;
103 qcom,pre-scaling = <1 1>;
111 qcom,pre-scaling = <1 1>;
119 qcom,pre-scaling = <1 1>;
127 qcom,pre-scaling = <1 1>;
H A Dpmi8950.dtsi25 qcom,pre-scaling = <1 20>;
31 qcom,pre-scaling = <1 20>;
37 qcom,pre-scaling = <1 3>;
43 qcom,pre-scaling = <1 1>;
49 qcom,pre-scaling = <1 1>;
55 qcom,pre-scaling = <1 1>;
H A Dpm6125.dtsi89 qcom,pre-scaling = <1 1>;
95 qcom,pre-scaling = <1 1>;
101 qcom,pre-scaling = <1 1>;
107 qcom,pre-scaling = <1 3>;
113 qcom,pre-scaling = <1 3>;
119 qcom,pre-scaling = <1 1>;
H A Dpm6150l.dtsi62 qcom,pre-scaling = <1 1>;
68 qcom,pre-scaling = <1 1>;
74 qcom,pre-scaling = <1 1>;
80 qcom,pre-scaling = <1 3>;
/linux/Documentation/userspace-api/media/v4l/
H A Dcrop.rst7 Image Cropping, Insertion and Scaling -- the CROP API
21 abilities cropping and scaling. Some video output devices can scale an
34 Scaling requires a source and a target. On a video capture or overlay
49 support scaling or the :ref:`VIDIOC_G_CROP <VIDIOC_G_CROP>` and
69 Image Cropping, Insertion and Scaling
71 The cropping, insertion and scaling process
109 Scaling Adjustments
112 Video hardware can have various cropping, insertion and scaling
113 limitations. It may only scale up or down, support only discrete scaling
114 factors, or have different scaling abilities in horizontal and vertical
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H A Dselection-api-configuration.rst12 Video hardware can have various cropping, composing and scaling
13 limitations. It may only scale up or down, support only discrete scaling
14 factors, or have different scaling abilities in the horizontal and
15 vertical directions. Also it may not support scaling at all. At the same
131 Scaling control
134 An application can detect if scaling is performed by comparing the width
137 scaling is applied. The application can compute the scaling ratios using
H A Ddev-subdev.rst104 :ref:`pipeline-scaling`, where image scaling can be performed on both
108 .. _pipeline-scaling:
121 scaling on the sensor is required to achieve higher frame rates.
196 - Sub-devices that scale frames using variable scaling factors should
198 modified. If the 1:1 scaling ratio is supported, this means that
209 for the pipeline described in :ref:`pipeline-scaling` (table columns
340 Selections: cropping, scaling and composition
363 The scaling operation changes the size of the image by scaling it to new
364 dimensions. The scaling ratio isn't specified explicitly, but is implied
368 Scaling support is optional. When supported by a subdev, the crop
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/linux/drivers/media/i2c/
H A Dsaa711x_regs.h112 /* Horizontal phase scaling */
120 /* Vertical scaling */
159 /* Horizontal phase scaling */
166 /* Vertical scaling */
422 /* Task A: Horizontal phase scaling */
424 "Task A: Horizontal luminance scaling increment"},
429 "Task A: Horizontal chrominance scaling increment"},
434 /* Task A: Vertical scaling */
436 "Task A: Vertical luminance scaling increment"},
438 "Task A: Vertical chrominance scaling increment"},
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/linux/drivers/staging/media/sunxi/cedrus/
H A Dcedrus_h265.c273 const struct v4l2_ctrl_hevc_scaling_matrix *scaling; in cedrus_h265_write_scaling_list() local
277 scaling = run->h265.scaling_matrix; in cedrus_h265_write_scaling_list()
280 (scaling->scaling_list_dc_coef_32x32[1] << 24) | in cedrus_h265_write_scaling_list()
281 (scaling->scaling_list_dc_coef_32x32[0] << 16) | in cedrus_h265_write_scaling_list()
282 (scaling->scaling_list_dc_coef_16x16[1] << 8) | in cedrus_h265_write_scaling_list()
283 (scaling->scaling_list_dc_coef_16x16[0] << 0)); in cedrus_h265_write_scaling_list()
286 (scaling->scaling_list_dc_coef_16x16[5] << 24) | in cedrus_h265_write_scaling_list()
287 (scaling->scaling_list_dc_coef_16x16[4] << 16) | in cedrus_h265_write_scaling_list()
288 (scaling->scaling_list_dc_coef_16x16[3] << 8) | in cedrus_h265_write_scaling_list()
289 (scaling->scaling_list_dc_coef_16x16[2] << 0)); in cedrus_h265_write_scaling_list()
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/linux/Documentation/devicetree/bindings/iio/dac/
H A Dadi,ad3552r.yaml105 adi,gain-scaling-p:
106 description: GainP = 1 / ( 2 ^ adi,gain-scaling-p)
110 adi,gain-scaling-n:
111 description: GainN = 1 / ( 2 ^ adi,gain-scaling-n)
120 - adi,gain-scaling-p
121 - adi,gain-scaling-n
241 adi,gain-scaling-p = <1>;
242 adi,gain-scaling-n = <2>;
/linux/drivers/gpu/drm/
H A Ddrm_rect.c84 * the corresponding amounts, retaining the vertical and horizontal scaling
152 * drm_rect_calc_hscale - calculate the horizontal scaling factor
155 * @min_hscale: minimum allowed horizontal scaling factor
156 * @max_hscale: maximum allowed horizontal scaling factor
158 * Calculate the horizontal scaling factor as
166 * The horizontal scaling factor, or errno of out of limits.
187 * drm_rect_calc_vscale - calculate the vertical scaling factor
190 * @min_vscale: minimum allowed vertical scaling factor
191 * @max_vscale: maximum allowed vertical scaling factor
193 * Calculate the vertical scaling factor as
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/linux/Documentation/devicetree/bindings/input/
H A Dmicrochip,qt1050.txt41 - microchip,average-scaling:
42 The scaling factor which is used to scale the average-samples.
61 microchip,average-scaling = <16>;
69 microchip,average-scaling = <8>;
76 microchip,average-scaling = <16>;
/linux/Documentation/cpu-freq/
H A Dindex.rst4 CPUFreq - CPU frequency and voltage scaling code in the Linux(TM) kernel
9 Clock scaling allows you to change the clock speed of the CPUs on the
35 Clock and voltage scaling for the SA-1100:
36 * http://www.lartmaker.nl/projects/scaling
/linux/drivers/gpu/drm/amd/display/dc/dcn20/
H A Ddcn20_dwb.c103 /* Only chroma scaling (sub-sampling) is supported in DCN2 */ in dwb2_enable()
107 DC_LOG_DWB("%s inst = %d, FAILED!LUMA SCALING NOT SUPPORTED", __func__, dwbc20->base.inst); in dwb2_enable()
123 /* Set scaling parameters */ in dwb2_enable()
163 /* Only chroma scaling (sub-sampling) is supported in DCN2 */ in dwb2_update()
166 DC_LOG_DWB("%s inst = %d, FAILED!LUMA SCALING NOT SUPPORTED", __func__, dwbc20->base.inst); in dwb2_update()
169 DC_LOG_DWB("%s inst = %d, scaling", __func__, dwbc20->base.inst); in dwb2_update()
187 /* Set scaling parameters */ in dwb2_update()
255 /* Program scaling mode */ in dwb2_set_scaler()
/linux/arch/arm/boot/dts/qcom/
H A Dpmx55.dtsi45 qcom,pre-scaling = <1 1>;
51 qcom,pre-scaling = <1 1>;
57 qcom,pre-scaling = <1 1>;
63 qcom,pre-scaling = <1 1>;
/linux/drivers/cpufreq/
H A DKconfig2 menu "CPU Frequency scaling"
5 bool "CPU Frequency scaling"
7 CPU Frequency scaling allows you to change the clock speed of
133 tristate "'userspace' governor for userspace frequency scaling"
206 comment "CPU frequency scaling drivers"
241 it updates the frequency scaling factor by polling host CPU frequency
332 tristate "CPU frequency scaling driver for Freescale QorIQ SoCs"
H A Dintel_pstate.c129 * @perf_ctl_scaling: PERF_CTL P-state to frequency scaling factor
130 * @scaling: Scaling factor between performance and frequency
144 int scaling; member
160 * Stores the voltage data for DVFS (Dynamic Voltage and Frequency Scaling)
278 * @get_scaling: Callback to get frequency scaling factor
279 * @get_cpu_scaling: Get frequency scaling factor for a given cpu
425 * Compute the perf-to-frequency scaling factor for the given CPU if in intel_pstate_cppc_get_scaling()
546 return freq / cpu->pstate.scaling; in intel_pstate_freq_to_hwp_rel()
548 return DIV_ROUND_CLOSEST(freq, cpu->pstate.scaling); in intel_pstate_freq_to_hwp_rel()
551 return DIV_ROUND_UP(freq, cpu->pstate.scaling); in intel_pstate_freq_to_hwp_rel()
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/linux/drivers/video/fbdev/kyro/
H A DSTG4000OverlayDevice.c45 /* Decimation and Scaling */
115 /* Set Vertical scaling to default */ in ResetOverlayRegisters()
119 tmp |= STG4000_NO_SCALING; /* Set to no scaling */ in ResetOverlayRegisters()
122 /* Set Horizontal Scaling to default */ in ResetOverlayRegisters()
126 tmp |= STG4000_NO_SCALING; /* Set to no scaling */ in ResetOverlayRegisters()
361 /************* Vertical decimation/scaling ******************/ in SetOverlayViewPort()
417 /***************** Horizontal decimation/scaling ***************************/ in SetOverlayViewPort()
515 * decimation and scaling in SetOverlayViewPort()
549 CLEAR_BITS_FRM_TO(16, 22); /* Vertical Scaling */ in SetOverlayViewPort()
560 from decimate and scaling calculations in SetOverlayViewPort()

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