linux-kernel - Re: [PATCH v4 2/3] drm/panel: Add Ilitek ILI9881c panel driver

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Date:   Sat, 5 May 2018 15:15:07 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     kbuild-all@...org, Thierry Reding <thierry.reding@...il.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Daniel Vetter <daniel.vetter@...el.com>
Subject: Re: [PATCH v4 2/3] drm/panel: Add Ilitek ILI9881c panel driver

Hi Maxime,

I love your patch! Perhaps something to improve:

[auto build test WARNING on ]

url:    https://github.com/0day-ci/linux/commits/Maxime-Ripard/drm-panel-Add-Ilitek-ILI9881c-controller-driver/20180505-104031
base:    
reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> drivers/gpu/drm/panel/panel-ilitek-ili9881c.c:303:62: sparse: incorrect type in initializer (different modifiers) @@    expected struct ili9881c_instr *instr @@    got structstruct ili9881c_instr *instr @@
   drivers/gpu/drm/panel/panel-ilitek-ili9881c.c:303:62:    expected struct ili9881c_instr *instr
   drivers/gpu/drm/panel/panel-ilitek-ili9881c.c:303:62:    got struct ili9881c_instr const *
   drivers/gpu/drm/panel/panel-ilitek-ili9881c.c: In function 'ili9881c_prepare':
   drivers/gpu/drm/panel/panel-ilitek-ili9881c.c:303:34: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
      struct ili9881c_instr *instr = &ili9881c_init[i];
                                     ^

vim +303 drivers/gpu/drm/panel/panel-ilitek-ili9881c.c

   284	
   285	static int ili9881c_prepare(struct drm_panel *panel)
   286	{
   287		struct ili9881c *ctx = panel_to_ili9881c(panel);
   288		unsigned int i;
   289		int ret;
   290	
   291		/* Power the panel */
   292		gpiod_set_value(ctx->power, 1);
   293		msleep(5);
   294	
   295		/* And reset it */
   296		gpiod_set_value(ctx->reset, 1);
   297		msleep(20);
   298	
   299		gpiod_set_value(ctx->reset, 0);
   300		msleep(20);
   301	
   302		for (i = 0; i < ARRAY_SIZE(ili9881c_init); i++) {
 > 303			struct ili9881c_instr *instr = &ili9881c_init[i];
   304	
   305			if (instr->op == ILI9881C_SWITCH_PAGE)
   306				ret = ili9881c_switch_page(ctx, instr->arg.page);
   307			else if (instr->op == ILI9881C_COMMAND)
   308				ret = ili9881c_send_cmd_data(ctx, instr->arg.cmd.cmd,
   309							      instr->arg.cmd.data);
   310	
   311			if (ret)
   312				return ret;
   313		}
   314	
   315		ret = ili9881c_switch_page(ctx, 0);
   316		if (ret)
   317			return ret;
   318	
   319		ret = mipi_dsi_dcs_set_tear_on(ctx->dsi, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
   320		if (ret)
   321			return ret;
   322	
   323		mipi_dsi_dcs_exit_sleep_mode(ctx->dsi);
   324		if (ret)
   325			return ret;
   326	
   327		return 0;
   328	}
   329	

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