[PATCH v4 0/2] Fix drm RAD print

[Lyude Paul]

LGTM - do you need me to push this to misc?

On Mon, 2025-01-13 at 17:10 +0800, Wayne Lin wrote:
> 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 at intel.com>
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Cc: Harry Wentland <hwentlan at amd.com>
> Cc: Lyude Paul <lyude at redhat.com>
> 
> [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(-)
> 

-- 
Cheers,
 Lyude Paul (she/her)
 Software Engineer at Red Hat

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