Hi Tomi, I love your patch! Perhaps something to improve: [auto build test WARNING on pinchartl-media/drm/du/next] [also build test WARNING on linus/master] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Tomi-Valkeinen/drm-rcar-du-DSI-fixes/20220822-210756 base: git://linuxtv.org/pinchartl/media.git drm/du/next config: riscv-randconfig-r042-20220821 (https://download.01.org/0day-ci/archive/20220823/202208231031.hFwNDAuL-lkp@xxxxxxxxx/config) compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project abce7acebd4c06c977bc4bd79170697f1122bc5e) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://github.com/intel-lab-lkp/linux/commit/d037472981c443d699c022aa91c5335f686d82ad git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Tomi-Valkeinen/drm-rcar-du-DSI-fixes/20220822-210756 git checkout d037472981c443d699c022aa91c5335f686d82ad # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash drivers/gpu/drm/rcar-du/ If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): In file included from drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c:10: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __raw_readb(PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:36:51: note: expanded from macro '__le16_to_cpu' #define __le16_to_cpu(x) ((__force __u16)(__le16)(x)) ^ In file included from drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c:10: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:34:51: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) ((__force __u32)(__le32)(x)) ^ In file included from drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c:10: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writeb(value, PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:1024:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port; ~~~~~~~~~~ ^ >> drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c:615:6: warning: no previous prototype for function 'rcar_mipi_dsi_pclk_enable' [-Wmissing-prototypes] void rcar_mipi_dsi_pclk_enable(struct drm_bridge *bridge, ^ drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c:615:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void rcar_mipi_dsi_pclk_enable(struct drm_bridge *bridge, ^ static >> drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c:654:6: warning: no previous prototype for function 'rcar_mipi_dsi_pclk_disable' [-Wmissing-prototypes] void rcar_mipi_dsi_pclk_disable(struct drm_bridge *bridge) ^ drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c:654:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void rcar_mipi_dsi_pclk_disable(struct drm_bridge *bridge) ^ static 9 warnings generated. vim +/rcar_mipi_dsi_pclk_enable +615 drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c 614 > 615 void rcar_mipi_dsi_pclk_enable(struct drm_bridge *bridge, 616 struct drm_atomic_state *state) 617 { 618 struct rcar_mipi_dsi *dsi = bridge_to_rcar_mipi_dsi(bridge); 619 const struct drm_display_mode *mode; 620 struct drm_connector *connector; 621 struct drm_crtc *crtc; 622 int ret; 623 624 connector = drm_atomic_get_new_connector_for_encoder(state, 625 bridge->encoder); 626 crtc = drm_atomic_get_new_connector_state(state, connector)->crtc; 627 mode = &drm_atomic_get_new_crtc_state(state, crtc)->adjusted_mode; 628 629 ret = rcar_mipi_dsi_clk_enable(dsi); 630 if (ret < 0) { 631 dev_err(dsi->dev, "failed to enable DSI clocks\n"); 632 return; 633 } 634 635 ret = rcar_mipi_dsi_startup(dsi, mode); 636 if (ret < 0) 637 goto err_dsi_startup; 638 639 rcar_mipi_dsi_set_display_timing(dsi, mode); 640 641 ret = rcar_mipi_dsi_start_hs_clock(dsi); 642 if (ret < 0) 643 goto err_dsi_start_hs; 644 645 return; 646 647 err_dsi_start_hs: 648 rcar_mipi_dsi_shutdown(dsi); 649 err_dsi_startup: 650 rcar_mipi_dsi_clk_disable(dsi); 651 } 652 EXPORT_SYMBOL_GPL(rcar_mipi_dsi_pclk_enable); 653 > 654 void rcar_mipi_dsi_pclk_disable(struct drm_bridge *bridge) 655 { 656 struct rcar_mipi_dsi *dsi = bridge_to_rcar_mipi_dsi(bridge); 657 658 rcar_mipi_dsi_shutdown(dsi); 659 rcar_mipi_dsi_clk_disable(dsi); 660 } 661 EXPORT_SYMBOL_GPL(rcar_mipi_dsi_pclk_disable); 662 -- 0-DAY CI Kernel Test Service https://01.org/lkp
