On 09/06, Sudip Mukherjee wrote: > On Tue, Sep 6, 2022 at 4:59 PM Sudip Mukherjee (Codethink) > <sudipm.mukherjee@xxxxxxxxx> wrote: > > > > Hi All, > > > > The builds of next-20220906 fails for mips, xtensa and arm allmodconfig. > > > > The errors in mips and xtensa are: > > > > ERROR: modpost: "__divdi3" [drivers/gpu/drm/vkms/vkms.ko] undefined! > > ERROR: modpost: "__udivdi3" [drivers/gpu/drm/vkms/vkms.ko] undefined! > > > > The error in arm is: > > > > ERROR: modpost: "__aeabi_uldivmod" [drivers/gpu/drm/vkms/vkms.ko] undefined! > > ERROR: modpost: "__aeabi_ldivmod" [drivers/gpu/drm/vkms/vkms.ko] undefined! > > > > > > Trying to do a git bisect to find out the offending commit. > > git bisect points to 396369d67549 ("drm: vkms: Add support to the > RGB565 format") Hi Sudip, Thanks for pointing out this issue. I think we can replace the macros that are triggering those compilation error by functions in drm/drm_fixed.h that do the same calculation. I checked those errors when building for arm and i386 and the issues are fixed after applying the patch below. I appreciate if you can test. I didn't check with mips and xtensa, but I guess it works in the same way. Igor, it would be good if you double-check the calculation and compare to your previous results. Thanks, Melissa --- From 0853d85c0b9d6108f916665ff55efa079f28bc53 Mon Sep 17 00:00:00 2001 From: Melissa Wen <mwen@xxxxxxxxxx> Date: Wed, 7 Sep 2022 15:14:31 -0100 Subject: [PATCH] drm/vkms: fix 32 bits compilation error by replacing macros Replace vkms_formats macro for fixed-point operations with functions from drm/drm_fixed.h to do the same job and fix 32-bits compilation errors. Fixes: a19c2ac9858 ("drm: vkms: Add support to the RGB565 format") Reported-by: Sudip Mukherjee <sudipm.mukherjee@xxxxxxxxx> Reported-by: kernel test robot <lkp@xxxxxxxxx> Signed-off-by: Melissa Wen <mwen@xxxxxxxxxx> --- drivers/gpu/drm/vkms/vkms_formats.c | 54 +++++++++++------------------ 1 file changed, 20 insertions(+), 34 deletions(-) diff --git a/drivers/gpu/drm/vkms/vkms_formats.c b/drivers/gpu/drm/vkms/vkms_formats.c index 30bf8e6660ad..5c2612b822d4 100644 --- a/drivers/gpu/drm/vkms/vkms_formats.c +++ b/drivers/gpu/drm/vkms/vkms_formats.c @@ -1,27 +1,12 @@ // SPDX-License-Identifier: GPL-2.0+ -#include <drm/drm_rect.h> +#include <linux/kernel.h> #include <linux/minmax.h> +#include <drm/drm_rect.h> +#include <drm/drm_fixed.h> #include "vkms_formats.h" -/* The following macros help doing fixed point arithmetic. */ -/* - * With Fixed-Point scale 15 we have 17 and 15 bits of integer and fractional - * parts respectively. - * | 0000 0000 0000 0000 0.000 0000 0000 0000 | - * 31 0 - */ -#define SHIFT 15 - -#define INT_TO_FIXED(a) ((a) << SHIFT) -#define FIXED_MUL(a, b) ((s32)(((s64)(a) * (b)) >> SHIFT)) -#define FIXED_DIV(a, b) ((s32)(((s64)(a) << SHIFT) / (b))) -/* This macro converts a fixed point number to int, and round half up it */ -#define FIXED_TO_INT_ROUND(a) (((a) + (1 << (SHIFT - 1))) >> SHIFT) -#define INT_TO_FIXED_DIV(a, b) (FIXED_DIV(INT_TO_FIXED(a), INT_TO_FIXED(b))) -#define INT_TO_FIXED_DIV(a, b) (FIXED_DIV(INT_TO_FIXED(a), INT_TO_FIXED(b))) - static size_t pixel_offset(const struct vkms_frame_info *frame_info, int x, int y) { return frame_info->offset + (y * frame_info->pitch) @@ -137,20 +122,21 @@ static void RGB565_to_argb_u16(struct line_buffer *stage_buffer, int x_limit = min_t(size_t, drm_rect_width(&frame_info->dst), stage_buffer->n_pixels); - s32 fp_rb_ratio = INT_TO_FIXED_DIV(65535, 31); - s32 fp_g_ratio = INT_TO_FIXED_DIV(65535, 63); + s32 fp_rb_ratio = drm_fixp_div(drm_int2fixp(65535), 31); + s32 fp_g_ratio = drm_fixp_div(drm_int2fixp(65535), 63); for (size_t x = 0; x < x_limit; x++, src_pixels++) { u16 rgb_565 = le16_to_cpu(*src_pixels); - s32 fp_r = INT_TO_FIXED((rgb_565 >> 11) & 0x1f); - s32 fp_g = INT_TO_FIXED((rgb_565 >> 5) & 0x3f); - s32 fp_b = INT_TO_FIXED(rgb_565 & 0x1f); + s32 fp_r = drm_int2fixp((rgb_565 >> 11) & 0x1f); + s32 fp_g = drm_int2fixp((rgb_565 >> 5) & 0x3f); + s32 fp_b = drm_int2fixp(rgb_565 & 0x1f); out_pixels[x].a = (u16)0xffff; - out_pixels[x].r = FIXED_TO_INT_ROUND(FIXED_MUL(fp_r, fp_rb_ratio)); - out_pixels[x].g = FIXED_TO_INT_ROUND(FIXED_MUL(fp_g, fp_g_ratio)); - out_pixels[x].b = FIXED_TO_INT_ROUND(FIXED_MUL(fp_b, fp_rb_ratio)); + out_pixels[x].r = drm_fixp2int(drm_fixp_mul(fp_r, fp_rb_ratio)); + out_pixels[x].g = drm_fixp2int(drm_fixp_mul(fp_g, fp_g_ratio)); + out_pixels[x].b = drm_fixp2int(drm_fixp_mul(fp_b, fp_rb_ratio)); } + } @@ -249,17 +235,17 @@ static void argb_u16_to_RGB565(struct vkms_frame_info *frame_info, int x_limit = min_t(size_t, drm_rect_width(&frame_info->dst), src_buffer->n_pixels); - s32 fp_rb_ratio = INT_TO_FIXED_DIV(65535, 31); - s32 fp_g_ratio = INT_TO_FIXED_DIV(65535, 63); + s32 fp_rb_ratio = drm_fixp_div(drm_int2fixp(65535), 31); + s32 fp_g_ratio = drm_fixp_div(drm_int2fixp(65535), 63); for (size_t x = 0; x < x_limit; x++, dst_pixels++) { - s32 fp_r = INT_TO_FIXED(in_pixels[x].r); - s32 fp_g = INT_TO_FIXED(in_pixels[x].g); - s32 fp_b = INT_TO_FIXED(in_pixels[x].b); + s32 fp_r = drm_int2fixp(in_pixels[x].r); + s32 fp_g = drm_int2fixp(in_pixels[x].g); + s32 fp_b = drm_int2fixp(in_pixels[x].b); - u16 r = FIXED_TO_INT_ROUND(FIXED_DIV(fp_r, fp_rb_ratio)); - u16 g = FIXED_TO_INT_ROUND(FIXED_DIV(fp_g, fp_g_ratio)); - u16 b = FIXED_TO_INT_ROUND(FIXED_DIV(fp_b, fp_rb_ratio)); + u16 r = drm_fixp2int(drm_fixp_div(fp_r, fp_rb_ratio)); + u16 g = drm_fixp2int(drm_fixp_div(fp_g, fp_g_ratio)); + u16 b = drm_fixp2int(drm_fixp_div(fp_b, fp_rb_ratio)); *dst_pixels = cpu_to_le16(r << 11 | g << 5 | b); } -- 2.35.1
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