drm/phytium: Fix some Bugs in Phytium Display Engine #753
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Reviewer's Guide by SourceryThe pull request refactors the Phytium Display Engine driver to add support for display scaling, introduce specific handling for BMC mode (including disabling the cursor plane and using different primary formats), and change backlight/panel power control to use PWM and GPIO instead of command registers. It also includes architecture-specific FPU handling and various minor fixes. No diagrams generated as the changes look simple and do not need a visual representation. File-Level Changes
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Hey @xuyan213 - I've reviewed your changes - here's some feedback:
Overall Comments:
- Consider refactoring duplicated code sections, such as the platform initialization and DC reset logic.
- Explore using standard kernel APIs for the scaling calculations instead of custom floating-point math and manual FPU/NEON handling.
- Review the placement and necessity of the architecture-specific FPU/NEON conditional compilation added in multiple files.
Here's what I looked at during the review
- 🟢 General issues: all looks good
- 🟢 Security: all looks good
- 🟢 Testing: all looks good
- 🟡 Complexity: 1 issue found
- 🟢 Documentation: all looks good
Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.
| uint32_t dst_size, | ||
| struct filter_blit_array *kernel_info) | ||
| { | ||
| uint32_t scale_factor; |
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issue (complexity): Consider extracting the weight computation and normalization loops in dc_calculate_sync_table() into a separate helper function to improve readability and maintainability.
It might help to extract parts of the inner loops from dc_calculate_sync_table() into separate helper functions. For example, consider moving the weight computation and normalization (the two inner loops) into a helper like:
static void compute_kernel_weights(float *fSubpixelSet, uint16_t *kernel_array,
int kernel_half, int kernelSize, float f_subpixel_offset, float f_scale) {
float fWeightSum = 0.0f;
int kernel_pos, index;
int padding = (MAXKERNELSIZE - kernelSize) / 2;
for (kernel_pos = 0; kernel_pos < MAXKERNELSIZE; kernel_pos++) {
index = kernel_pos - padding;
if (index < 0 || index >= kernelSize) {
fSubpixelSet[kernel_pos] = 0.0f;
} else if (kernelSize == 1) {
fSubpixelSet[kernel_pos] = 1.0f;
} else {
float fX = MATH_Add(MATH_I2Float(index - kernel_half), f_subpixel_offset);
fX = MATH_Multiply(fX, f_scale);
fSubpixelSet[kernel_pos] = dc_sinc_filter(fX, kernel_half);
}
fWeightSum = MATH_Add(fWeightSum, fSubpixelSet[kernel_pos]);
}
for (kernel_pos = 0; kernel_pos < MAXKERNELSIZE; kernel_pos++) {
float fWeight = MATH_Divide(fSubpixelSet[kernel_pos], fWeightSum);
if (fWeight == 0.0f)
kernel_array[kernel_pos] = 0x0000;
else if (fWeight >= 1.0f)
kernel_array[kernel_pos] = 0x4000;
else if (fWeight <= -1.0f)
kernel_array[kernel_pos] = 0xC000;
else
kernel_array[kernel_pos] = (int16_t) MATH_Multiply(fWeight, 16384.0f);
}
}Then, in dc_calculate_sync_table() you simply call this helper inside your subpixel loop:
for (subpixel_pos = 0; subpixel_pos < SUBPIXELLOADCOUNT; subpixel_pos++) {
float fSubpixelSet[MAXKERNELSIZE];
compute_kernel_weights(fSubpixelSet, kernel_array, kernel_half,
kernel_info->kernelSize, f_subpixel_offset, f_scale);
/* ... remaining adjustments and table update ... */
kernel_array += MAXKERNELSIZE;
f_subpixel_offset = MATH_Add(f_subpixel_offset, -f_subpixel_step);
}This refactoring reduces nesting in the main function and isolates the weight computation logic, making it easier to maintain while preserving functionality.
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/retest |
drivers/gpu/drm/phytium/Makefile
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| @@ -16,3 +16,8 @@ phytium-dc-drm-y := phytium_display_drv.o \ | |||
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| obj-$(CONFIG_DRM_PHYTIUM) += phytium-dc-drm.o | |||
| CFLAGS_REMOVE_phytium_crtc.o += -mgeneral-regs-only | |||
| ifeq ($(ARCH), x86) | |||
| FPU_CFLAGS += -mhard-float | |||
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clang-19: error: unsupported option '-mhard-float' for target 'x86_64-linux-gnu'
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/retest |
由于当前x86未开启phytium drm所以ci检测不出编译错误，clang的x86 target不支持-mhard-float |
Avenger-285714
requested changes
May 12, 2025
drivers/gpu/drm/phytium/Makefile
Outdated
| @@ -16,3 +16,12 @@ phytium-dc-drm-y := phytium_display_drv.o \ | |||
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| obj-$(CONFIG_DRM_PHYTIUM) += phytium-dc-drm.o | |||
| CFLAGS_REMOVE_phytium_crtc.o += -mgeneral-regs-only | |||
| ifeq ($(ARCH), x86) | |||
| ifeq ($(shell uname -m), x86_64) | |||
| FPU_CFLAGS += | |||
xuyan213
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modified this files to support Phytium Display Engine more. Signed-off-by: Xu Yan <[email protected]> Signed-off-by: Yang Xun <[email protected]> Signed-off-by: Chen Baozi <[email protected]> Signed-off-by: Wang Yinfeng <[email protected]>
Avenger-285714
merged commit 6a4f1c9
into
deepin-community:linux-6.6.y
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modified this files to support Phytium Display Engine more.
Summary by Sourcery
Add display scaling, BMC mode support, and PWM backlight control for Phytium display driver, along with various fixes and improvements.
New Features:
Bug Fixes:
Enhancements:
Build:
Chores: