linux-kernel - Re: [PATCH v6 14/14] drm/msm/dsi: Add support for DSC configuration

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Date:   Wed, 6 Apr 2022 03:12:36 +0800
From:   kernel test robot <lkp@...el.com>
To:     Vinod Koul <vkoul@...nel.org>, Rob Clark <robdclark@...il.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        Jonathan Marek <jonathan@...ek.ca>,
        David Airlie <airlied@...ux.ie>, linux-arm-msm@...r.kernel.org,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        dri-devel@...ts.freedesktop.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 14/14] drm/msm/dsi: Add support for DSC configuration

Hi Vinod,

I love your patch! Perhaps something to improve:

[auto build test WARNING on 05241de1f69eb7f56b0a5e0bec96a7752fad1b2f]

url:    https://github.com/intel-lab-lkp/linux/commits/Vinod-Koul/drm-msm-Add-Display-Stream-Compression-Support/20220405-003745
base:   05241de1f69eb7f56b0a5e0bec96a7752fad1b2f
config: hexagon-randconfig-r004-20220405 (https://download.01.org/0day-ci/archive/20220406/202204060308.OkAS3XG3-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project c4a1b07d0979e7ff20d7d541af666d822d66b566)
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
        # https://github.com/intel-lab-lkp/linux/commit/6c54db3ee1e02d639e568c37121f797ac586af3d
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Vinod-Koul/drm-msm-Add-Display-Stream-Compression-Support/20220405-003745
        git checkout 6c54db3ee1e02d639e568c37121f797ac586af3d
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash drivers/gpu/drm/msm/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/msm/dsi/dsi_host.c:918:23: warning: variable 'reg_ctrl' set but not used [-Wunused-but-set-variable]
           u32 reg, intf_width, reg_ctrl, reg_ctrl2;
                                ^
   1 warning generated.


vim +/reg_ctrl +918 drivers/gpu/drm/msm/dsi/dsi_host.c

   914	
   915	static void dsi_update_dsc_timing(struct msm_dsi_host *msm_host, bool is_cmd_mode, u32 hdisplay)
   916	{
   917		struct msm_display_dsc_config *dsc = msm_host->dsc;
 > 918		u32 reg, intf_width, reg_ctrl, reg_ctrl2;
   919		u32 slice_per_intf, total_bytes_per_intf;
   920		u32 pkt_per_line;
   921		u32 bytes_in_slice;
   922		u32 eol_byte_num;
   923	
   924		/* first calculate dsc parameters and then program
   925		 * compress mode registers
   926		 */
   927		intf_width = hdisplay;
   928		slice_per_intf = DIV_ROUND_UP(intf_width, dsc->drm->slice_width);
   929	
   930		/* If slice_per_pkt is greater than slice_per_intf
   931		 * then default to 1. This can happen during partial
   932		 * update.
   933		 */
   934		if (slice_per_intf > dsc->drm->slice_count)
   935			dsc->drm->slice_count = 1;
   936	
   937		slice_per_intf = DIV_ROUND_UP(hdisplay, dsc->drm->slice_width);
   938		bytes_in_slice = DIV_ROUND_UP(dsc->drm->slice_width * dsc->drm->bits_per_pixel, 8);
   939	
   940		dsc->drm->slice_chunk_size = bytes_in_slice;
   941	
   942		total_bytes_per_intf = bytes_in_slice * slice_per_intf;
   943	
   944		eol_byte_num = total_bytes_per_intf % 3;
   945		pkt_per_line = slice_per_intf / dsc->drm->slice_count;
   946	
   947		if (is_cmd_mode) /* packet data type */
   948			reg = DSI_COMMAND_COMPRESSION_MODE_CTRL_STREAM0_DATATYPE(MIPI_DSI_DCS_LONG_WRITE);
   949		else
   950			reg = DSI_VIDEO_COMPRESSION_MODE_CTRL_DATATYPE(MIPI_DSI_COMPRESSED_PIXEL_STREAM);
   951	
   952		/* DSI_VIDEO_COMPRESSION_MODE & DSI_COMMAND_COMPRESSION_MODE
   953		 * registers have similar offsets, so for below common code use
   954		 * DSI_VIDEO_COMPRESSION_MODE_XXXX for setting bits
   955		 */
   956		reg |= DSI_VIDEO_COMPRESSION_MODE_CTRL_PKT_PER_LINE(pkt_per_line >> 1);
   957		reg |= DSI_VIDEO_COMPRESSION_MODE_CTRL_EOL_BYTE_NUM(eol_byte_num);
   958		reg |= DSI_VIDEO_COMPRESSION_MODE_CTRL_EN;
   959	
   960		if (is_cmd_mode) {
   961			reg_ctrl = dsi_read(msm_host, REG_DSI_COMMAND_COMPRESSION_MODE_CTRL);
   962			reg_ctrl2 = dsi_read(msm_host, REG_DSI_COMMAND_COMPRESSION_MODE_CTRL2);
   963	
   964			reg_ctrl |= reg;
   965			reg_ctrl2 |= DSI_COMMAND_COMPRESSION_MODE_CTRL2_STREAM0_SLICE_WIDTH(bytes_in_slice);
   966	
   967			dsi_write(msm_host, REG_DSI_COMMAND_COMPRESSION_MODE_CTRL, reg);
   968			dsi_write(msm_host, REG_DSI_COMMAND_COMPRESSION_MODE_CTRL2, reg_ctrl2);
   969		} else {
   970			dsi_write(msm_host, REG_DSI_VIDEO_COMPRESSION_MODE_CTRL, reg);
   971		}
   972	}
   973	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp