tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: 604e996dd0189ddb0875f389b87fa2084b3a9424 commit: 2815e6db6a7a2f0759dfc574e28b3b807a1a3377 [1693/1693] drm/loongson: use old version of ast driver for LoongArch platform config: loongarch-randconfig-r112-20250103 (https://download.01.org/0day-ci/archive/20250103/202501031900.rHaRpOIu-lkp@i...) compiler: loongarch64-linux-gcc (GCC) 14.2.0 reproduce: (https://download.01.org/0day-ci/archive/20250103/202501031900.rHaRpOIu-lkp@i...)

If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot lkp@intel.com | Closes: https://lore.kernel.org/oe-kbuild-all/202501031900.rHaRpOIu-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)

...

drivers/gpu/drm/loongson/ast_old/ast_mode.c:746:19: sparse: sparse: cast removes address space '__iomem' of expression drivers/gpu/drm/loongson/ast_old/ast_mode.c:746:16: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected unsigned char [noderef] [usertype] __iomem *dstxor @@ got unsigned char [usertype] * @@

drivers/gpu/drm/loongson/ast_old/ast_mode.c:746:16: sparse: expected unsigned char [noderef] [usertype] __iomem *dstxor drivers/gpu/drm/loongson/ast_old/ast_mode.c:746:16: sparse: got unsigned char [usertype] * drivers/gpu/drm/loongson/ast_old/ast_mode.c: note: in included file (through arch/loongarch/include/asm/cpu-info.h, arch/loongarch/include/asm/processor.h, ...): arch/loongarch/include/asm/loongarch.h:1136:16: sparse: sparse: undefined identifier '__builtin_loongarch_csrrd_w'

vim +/__iomem +746 drivers/gpu/drm/loongson/ast_old/ast_mode.c

719 720 /* 721 * Cursor plane 722 */ 723 724 static void ast_update_cursor_image(u8 __iomem *dst, const u8 *src, int width, 725 int height) 726 { 727 union { 728 u32 ul; 729 u8 b[4]; 730 } srcdata32[2], data32; 731 union { 732 u16 us; 733 u8 b[2]; 734 } data16; 735 u32 csum = 0; 736 s32 alpha_dst_delta, last_alpha_dst_delta; 737 u8 __iomem *dstxor; 738 const u8 *srcxor; 739 int i, j; 740 u32 per_pixel_copy, two_pixel_copy; 741 742 alpha_dst_delta = AST_MAX_HWC_WIDTH << 1; 743 last_alpha_dst_delta = alpha_dst_delta - (width << 1); 744 745 srcxor = src;

746 dstxor = (u8 *)dst + last_alpha_dst_delta +

747 (AST_MAX_HWC_HEIGHT - height) * alpha_dst_delta; 748 per_pixel_copy = width & 1; 749 two_pixel_copy = width >> 1; 750 751 for (j = 0; j < height; j++) { 752 for (i = 0; i < two_pixel_copy; i++) { 753 srcdata32[0].ul = *((u32 *)srcxor) & 0xf0f0f0f0; 754 srcdata32[1].ul = *((u32 *)(srcxor + 4)) & 0xf0f0f0f0; 755 data32.b[0] = srcdata32[0].b[1] | 756 (srcdata32[0].b[0] >> 4); 757 data32.b[1] = srcdata32[0].b[3] | 758 (srcdata32[0].b[2] >> 4); 759 data32.b[2] = srcdata32[1].b[1] | 760 (srcdata32[1].b[0] >> 4); 761 data32.b[3] = srcdata32[1].b[3] | 762 (srcdata32[1].b[2] >> 4); 763 764 writel(data32.ul, dstxor); 765 csum += data32.ul; 766 767 dstxor += 4; 768 srcxor += 8; 769 } 770 771 for (i = 0; i < per_pixel_copy; i++) { 772 srcdata32[0].ul = *((u32 *)srcxor) & 0xf0f0f0f0; 773 data16.b[0] = srcdata32[0].b[1] | 774 (srcdata32[0].b[0] >> 4); 775 data16.b[1] = srcdata32[0].b[3] | 776 (srcdata32[0].b[2] >> 4); 777 writew(data16.us, dstxor); 778 csum += (u32)data16.us; 779 780 dstxor += 2; 781 srcxor += 4; 782 } 783 dstxor += last_alpha_dst_delta; 784 } 785 786 /* write checksum + signature */ 787 dst += AST_HWC_SIZE; 788 writel(csum, dst); 789 writel(width, dst + AST_HWC_SIGNATURE_SizeX); 790 writel(height, dst + AST_HWC_SIGNATURE_SizeY); 791 writel(0, dst + AST_HWC_SIGNATURE_HOTSPOTX); 792 writel(0, dst + AST_HWC_SIGNATURE_HOTSPOTY); 793 } 794