Re: [PATCHv2] drm/i915/dp: Guarantee a minimum HBlank time

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

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
In-Reply-To: <20241001074348.2193502-1-arun.r.murthy@intel.com>
References: <20241001074348.2193502-1-arun.r.murthy@intel.com>
TO: Arun R Murthy <arun.r.murthy@intel.com>
TO: intel-xe@lists.freedesktop.org
TO: intel-gfx@lists.freedesktop.org
CC: Arun R Murthy <arun.r.murthy@intel.com>

Hi Arun,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-intel/for-linux-next]
[also build test WARNING on linus/master v6.12-rc1 next-20241001]
[cannot apply to drm-intel/for-linux-next-fixes drm-tip/drm-tip]
[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/Arun-R-Murthy/drm-i915-dp-Guarantee-a-minimum-HBlank-time/20241001-155536
base:   git://anongit.freedesktop.org/drm-intel for-linux-next
patch link:    https://lore.kernel.org/r/20241001074348.2193502-1-arun.r.murthy%40intel.com
patch subject: [PATCHv2] drm/i915/dp: Guarantee a minimum HBlank time
:::::: branch date: 19 hours ago
:::::: commit date: 19 hours ago
config: x86_64-randconfig-104-20241002 (https://download.01.org/0day-ci/archive/20241002/202410021032.BpJez1ja-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0

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: Julia Lawall <julia.lawall@inria.fr>
| Closes: https://lore.kernel.org/r/202410021032.BpJez1ja-lkp@intel.com/

cocci warnings: (new ones prefixed by >>)
>> drivers/gpu/drm/i915/display/intel_dp_mst.c:178:32-33: WARNING opportunity for max()
   drivers/gpu/drm/i915/display/intel_dp_mst.c:180:32-33: WARNING opportunity for max()

vim +178 drivers/gpu/drm/i915/display/intel_dp_mst.c

9069b77545ca5a Imre Deak     2023-11-17  158  
9ffe2a8e0d3097 Arun R Murthy 2024-10-01  159  static void intel_dp_mst_compute_min_hblank(struct intel_crtc_state *crtc_state,
9ffe2a8e0d3097 Arun R Murthy 2024-10-01  160  					    struct intel_connector *intel_connector,
9ffe2a8e0d3097 Arun R Murthy 2024-10-01  161  					    int bpp_x16)
9ffe2a8e0d3097 Arun R Murthy 2024-10-01  162  {
9ffe2a8e0d3097 Arun R Murthy 2024-10-01  163  	struct intel_encoder *intel_encoder = intel_connector->encoder;
9ffe2a8e0d3097 Arun R Murthy 2024-10-01  164  	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(intel_encoder);
9ffe2a8e0d3097 Arun R Murthy 2024-10-01  165  	struct intel_dp *intel_dp = &intel_mst->primary->dp;
9ffe2a8e0d3097 Arun R Murthy 2024-10-01  166  	struct intel_display *intel_display = to_intel_display(intel_encoder);
9ffe2a8e0d3097 Arun R Murthy 2024-10-01  167  	const struct drm_display_mode *adjusted_mode =
9ffe2a8e0d3097 Arun R Murthy 2024-10-01  168  					&crtc_state->hw.adjusted_mode;
9ffe2a8e0d3097 Arun R Murthy 2024-10-01  169  	u32 symbol_size = intel_dp_is_uhbr(crtc_state) ? 32 : 8;
9ffe2a8e0d3097 Arun R Murthy 2024-10-01  170  	u32 hblank;
9ffe2a8e0d3097 Arun R Murthy 2024-10-01  171  
9ffe2a8e0d3097 Arun R Murthy 2024-10-01  172  	if (DISPLAY_VER(intel_display) < 20)
9ffe2a8e0d3097 Arun R Murthy 2024-10-01  173  		return;
9ffe2a8e0d3097 Arun R Murthy 2024-10-01  174  
9ffe2a8e0d3097 Arun R Murthy 2024-10-01  175  	/* Calculate min Hblank Link Layer Symbol Cycle Count for 8b/10b MST & 128b/132b */
9ffe2a8e0d3097 Arun R Murthy 2024-10-01  176  	hblank = DIV_ROUND_UP((DIV_ROUND_UP(adjusted_mode->htotal - adjusted_mode->hdisplay, 4) * bpp_x16), symbol_size);
9ffe2a8e0d3097 Arun R Murthy 2024-10-01  177  	if (intel_dp_is_uhbr(crtc_state))
9ffe2a8e0d3097 Arun R Murthy 2024-10-01 @178  		intel_dp->min_hblank = hblank > 5 ? hblank : 5;
9ffe2a8e0d3097 Arun R Murthy 2024-10-01  179  	else
9ffe2a8e0d3097 Arun R Murthy 2024-10-01  180  		intel_dp->min_hblank = hblank > 3 ? hblank : 3;
9ffe2a8e0d3097 Arun R Murthy 2024-10-01  181  }
9ffe2a8e0d3097 Arun R Murthy 2024-10-01  182  

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