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drm/vkms: fix 32bit 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-bit compilation errors. v2: - don't cast results to s32 (Igor) - add missing drm_fixp2int conversion (Igor) Fixes: a19c2ac9858 ("drm: vkms: Add support to the RGB565 format") Tested-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com> (v1) Reviewed-by: Alex Deucher <alexander.deucher@amd.com> (v1) Reported-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com> Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Melissa Wen <mwen@igalia.com> Signed-off-by: Dave Airlie <airlied@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220910190303.682897-1-mwen@igalia.com
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commit
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1 changed files with 19 additions and 34 deletions
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@ -1,27 +1,12 @@
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// SPDX-License-Identifier: GPL-2.0+
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#include <drm/drm_rect.h>
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#include <linux/kernel.h>
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#include <linux/minmax.h>
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#include <drm/drm_rect.h>
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#include <drm/drm_fixed.h>
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#include "vkms_formats.h"
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/* The following macros help doing fixed point arithmetic. */
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/*
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* With Fixed-Point scale 15 we have 17 and 15 bits of integer and fractional
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* parts respectively.
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* | 0000 0000 0000 0000 0.000 0000 0000 0000 |
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* 31 0
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*/
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#define SHIFT 15
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#define INT_TO_FIXED(a) ((a) << SHIFT)
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#define FIXED_MUL(a, b) ((s32)(((s64)(a) * (b)) >> SHIFT))
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#define FIXED_DIV(a, b) ((s32)(((s64)(a) << SHIFT) / (b)))
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/* This macro converts a fixed point number to int, and round half up it */
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#define FIXED_TO_INT_ROUND(a) (((a) + (1 << (SHIFT - 1))) >> SHIFT)
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#define INT_TO_FIXED_DIV(a, b) (FIXED_DIV(INT_TO_FIXED(a), INT_TO_FIXED(b)))
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#define INT_TO_FIXED_DIV(a, b) (FIXED_DIV(INT_TO_FIXED(a), INT_TO_FIXED(b)))
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static size_t pixel_offset(const struct vkms_frame_info *frame_info, int x, int y)
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{
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return frame_info->offset + (y * frame_info->pitch)
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@ -137,19 +122,19 @@ static void RGB565_to_argb_u16(struct line_buffer *stage_buffer,
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int x_limit = min_t(size_t, drm_rect_width(&frame_info->dst),
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stage_buffer->n_pixels);
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s32 fp_rb_ratio = INT_TO_FIXED_DIV(65535, 31);
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s32 fp_g_ratio = INT_TO_FIXED_DIV(65535, 63);
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s64 fp_rb_ratio = drm_fixp_div(drm_int2fixp(65535), drm_int2fixp(31));
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s64 fp_g_ratio = drm_fixp_div(drm_int2fixp(65535), drm_int2fixp(63));
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for (size_t x = 0; x < x_limit; x++, src_pixels++) {
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u16 rgb_565 = le16_to_cpu(*src_pixels);
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s32 fp_r = INT_TO_FIXED((rgb_565 >> 11) & 0x1f);
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s32 fp_g = INT_TO_FIXED((rgb_565 >> 5) & 0x3f);
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s32 fp_b = INT_TO_FIXED(rgb_565 & 0x1f);
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s64 fp_r = drm_int2fixp((rgb_565 >> 11) & 0x1f);
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s64 fp_g = drm_int2fixp((rgb_565 >> 5) & 0x3f);
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s64 fp_b = drm_int2fixp(rgb_565 & 0x1f);
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out_pixels[x].a = (u16)0xffff;
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out_pixels[x].r = FIXED_TO_INT_ROUND(FIXED_MUL(fp_r, fp_rb_ratio));
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out_pixels[x].g = FIXED_TO_INT_ROUND(FIXED_MUL(fp_g, fp_g_ratio));
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out_pixels[x].b = FIXED_TO_INT_ROUND(FIXED_MUL(fp_b, fp_rb_ratio));
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out_pixels[x].r = drm_fixp2int(drm_fixp_mul(fp_r, fp_rb_ratio));
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out_pixels[x].g = drm_fixp2int(drm_fixp_mul(fp_g, fp_g_ratio));
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out_pixels[x].b = drm_fixp2int(drm_fixp_mul(fp_b, fp_rb_ratio));
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}
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}
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@ -248,17 +233,17 @@ static void argb_u16_to_RGB565(struct vkms_frame_info *frame_info,
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int x_limit = min_t(size_t, drm_rect_width(&frame_info->dst),
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src_buffer->n_pixels);
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s32 fp_rb_ratio = INT_TO_FIXED_DIV(65535, 31);
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s32 fp_g_ratio = INT_TO_FIXED_DIV(65535, 63);
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s64 fp_rb_ratio = drm_fixp_div(drm_int2fixp(65535), drm_int2fixp(31));
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s64 fp_g_ratio = drm_fixp_div(drm_int2fixp(65535), drm_int2fixp(63));
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for (size_t x = 0; x < x_limit; x++, dst_pixels++) {
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s32 fp_r = INT_TO_FIXED(in_pixels[x].r);
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s32 fp_g = INT_TO_FIXED(in_pixels[x].g);
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s32 fp_b = INT_TO_FIXED(in_pixels[x].b);
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s64 fp_r = drm_int2fixp(in_pixels[x].r);
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s64 fp_g = drm_int2fixp(in_pixels[x].g);
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s64 fp_b = drm_int2fixp(in_pixels[x].b);
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u16 r = FIXED_TO_INT_ROUND(FIXED_DIV(fp_r, fp_rb_ratio));
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u16 g = FIXED_TO_INT_ROUND(FIXED_DIV(fp_g, fp_g_ratio));
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u16 b = FIXED_TO_INT_ROUND(FIXED_DIV(fp_b, fp_rb_ratio));
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u16 r = drm_fixp2int(drm_fixp_div(fp_r, fp_rb_ratio));
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u16 g = drm_fixp2int(drm_fixp_div(fp_g, fp_g_ratio));
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u16 b = drm_fixp2int(drm_fixp_div(fp_b, fp_rb_ratio));
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*dst_pixels = cpu_to_le16(r << 11 | g << 5 | b);
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}
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