Re: [PATCH v5 08/13] drm/stm: ltdc: handle lvds pixel clock

[kernel test robot <lkp@intel.com>]

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TO: "Raphael Gallais-Pou" <raphael.gallais-pou@foss.st.com>
TO: Yannick Fertre <yannick.fertre@foss.st.com>
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Hi Raphael,

kernel test robot noticed the following build warnings:

[auto build test WARNING on c8cea4371e5eca30cda8660aabb337747dabc51d]

url:    https://github.com/intel-lab-lkp/linux/commits/Raphael-Gallais-Pou/dt-bindings-display-st-add-two-new-compatibles-to-LTDC-device/20250822-224549
base:   c8cea4371e5eca30cda8660aabb337747dabc51d
patch link:    https://lore.kernel.org/r/20250822-drm-misc-next-v5-8-9c825e28f733%40foss.st.com
patch subject: [PATCH v5 08/13] drm/stm: ltdc: handle lvds pixel clock
:::::: branch date: 2 days ago
:::::: commit date: 2 days ago
config: arm-randconfig-r072-20250824 (https://download.01.org/0day-ci/archive/20250825/202508250449.oAIDCFbM-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 8.5.0

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>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202508250449.oAIDCFbM-lkp@intel.com/

New smatch warnings:
drivers/gpu/drm/stm/ltdc.c:1918 ltdc_resume() warn: 'ldev->bus_clk' from clk_prepare_enable() not released on lines: 1918.

Old smatch warnings:
drivers/gpu/drm/stm/ltdc.c:944 ltdc_crtc_mode_set_nofb() warn: pm_runtime_get_sync() also returns 1 on success
drivers/gpu/drm/stm/ltdc.c:1918 ltdc_resume() warn: 'ldev->pixel_clk' from clk_prepare_enable() not released on lines: 1908,1918.
drivers/gpu/drm/stm/ltdc.c:2097 ltdc_load() warn: 'ldev->bus_clk' from clk_prepare_enable() not released on lines: 2097.
drivers/gpu/drm/stm/ltdc.c:2097 ltdc_load() warn: 'ldev->pixel_clk' from clk_prepare_enable() not released on lines: 1963.

vim +1918 drivers/gpu/drm/stm/ltdc.c

df61c776657fa5 Yannick Fertré 2019-03-21  1890  
df61c776657fa5 Yannick Fertré 2019-03-21  1891  int ltdc_resume(struct drm_device *ddev)
df61c776657fa5 Yannick Fertré 2019-03-21  1892  {
df61c776657fa5 Yannick Fertré 2019-03-21  1893  	struct ltdc_device *ldev = ddev->dev_private;
df61c776657fa5 Yannick Fertré 2019-03-21  1894  	int ret;
df61c776657fa5 Yannick Fertré 2019-03-21  1895  
df61c776657fa5 Yannick Fertré 2019-03-21  1896  	DRM_DEBUG_DRIVER("\n");
df61c776657fa5 Yannick Fertré 2019-03-21  1897  
df61c776657fa5 Yannick Fertré 2019-03-21  1898  	ret = clk_prepare_enable(ldev->pixel_clk);
df61c776657fa5 Yannick Fertré 2019-03-21  1899  	if (ret) {
df61c776657fa5 Yannick Fertré 2019-03-21  1900  		DRM_ERROR("failed to enable pixel clock (%d)\n", ret);
df61c776657fa5 Yannick Fertré 2019-03-21  1901  		return ret;
df61c776657fa5 Yannick Fertré 2019-03-21  1902  	}
df61c776657fa5 Yannick Fertré 2019-03-21  1903  
4bc19104512f12 Yannick Fertre 2025-08-22  1904  	if (ldev->bus_clk) {
4bc19104512f12 Yannick Fertre 2025-08-22  1905  		ret = clk_prepare_enable(ldev->bus_clk);
8ed2dad23c5fb4 Yannick Fertre 2025-08-22  1906  		if (ret) {
4bc19104512f12 Yannick Fertre 2025-08-22  1907  			drm_err(ddev, "failed to enable bus clock (%d)\n", ret);
8ed2dad23c5fb4 Yannick Fertre 2025-08-22  1908  			return ret;
8ed2dad23c5fb4 Yannick Fertre 2025-08-22  1909  		}
8ed2dad23c5fb4 Yannick Fertre 2025-08-22  1910  	}
8ed2dad23c5fb4 Yannick Fertre 2025-08-22  1911  
8ed2dad23c5fb4 Yannick Fertre 2025-08-22  1912  	if (ldev->lvds_clk) {
8ed2dad23c5fb4 Yannick Fertre 2025-08-22  1913  		ret = clk_prepare_enable(ldev->lvds_clk);
8ed2dad23c5fb4 Yannick Fertre 2025-08-22  1914  		if (ret)
8ed2dad23c5fb4 Yannick Fertre 2025-08-22  1915  			drm_err(ddev, "failed to prepare lvds clock\n");
4bc19104512f12 Yannick Fertre 2025-08-22  1916  	}
4bc19104512f12 Yannick Fertre 2025-08-22  1917  
4bc19104512f12 Yannick Fertre 2025-08-22 @1918  	return ret;
df61c776657fa5 Yannick Fertré 2019-03-21  1919  }
df61c776657fa5 Yannick Fertré 2019-03-21  1920  

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