[PATCH v4 0/2] Fix drm RAD print

[Wayne Lin <Wayne.Lin@xxxxxxx>]

This is v4 of [1], with the following changes:

- Fix warning caught by kernel test robot:
drivers/gpu/drm/display/drm_dp_mst_topology.c: In function 'drm_dp_mst_rad_to_str':
>> drivers/gpu/drm/display/drm_dp_mst_topology.c:201:81: warning: passing argument 2 of 'drm_dp_mst_get_ufp_num_at_lct_from_rad' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
     201 |                 unpacked_rad[i] = drm_dp_mst_get_ufp_num_at_lct_from_rad(i + 1, rad);
         |                                                                                 ^~~
   drivers/gpu/drm/display/drm_dp_mst_topology.c:179:52: note: expected 'u8 *' {aka 'unsigned char *'} but argument is of type 'const u8 *' {aka 'const unsigned char *'}
     179 | drm_dp_mst_get_ufp_num_at_lct_from_rad(u8 lct, u8 *rad)
         |                                                ~~~~^~~


vim +201 drivers/gpu/drm/display/drm_dp_mst_topology.c

   193 
   194  static int
   195  drm_dp_mst_rad_to_str(const u8 rad[8], u8 lct, char *out, size_t len)
   196  {
   197          int i;
   198          u8 unpacked_rad[16] = {};
   199 
   200          for (i = 0; i < lct; i++)
 > 201                   unpacked_rad[i] = drm_dp_mst_get_ufp_num_at_lct_from_rad(i + 1, rad);
   202 
   203          /* TODO: Eventually add something to printk so we can format the rad
   204           * like this: 1.2.3
   205           */
   206          return snprintf(out, len, "%*phC", lct, unpacked_rad);
   207  }
   208 


Cc: Imre Deak <imre.deak@xxxxxxxxx>
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Harry Wentland <hwentlan@xxxxxxx>
Cc: Lyude Paul <lyude@xxxxxxxxxx>

[1] https://patchwork.freedesktop.org/series/141832/

Wayne Lin (2):
  drm/dp_mst: Fix drm RAD print
  drm/dp_mst: Add helper to get port number at specific LCT from RAD

 drivers/gpu/drm/display/drm_dp_mst_topology.c | 31 +++++++++++++------
 include/drm/display/drm_dp_mst_helper.h       |  7 +++++
 2 files changed, 28 insertions(+), 10 deletions(-)

-- 
2.37.3