diff options
| author | Jani Nikula <jani.nikula@intel.com> | 2022-08-15 11:58:34 +0300 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2022-08-30 11:02:42 +0300 |
| commit | 5b04aab6d49578eacd6d341e281c70a769f96126 (patch) | |
| tree | 8f5b7e6c8626ed8fe7bac0e481aeed24d9169829 /drivers/gpu | |
| parent | 55453c0914d9b81e75c5c83adb2dd9382da2c79d (diff) | |
| download | linux-5b04aab6d49578eacd6d341e281c70a769f96126.tar.bz2 | |
drm/dp: add drm_dp_phy_name() for getting DP PHY name
Add a helper for getting the DP PHY name. In the interest of caller
simplicity and to avoid allocations and passing in of buffers, duplicate
the const strings to return. It's a minor penalty to pay for simplicity
in all the call sites.
v2: Rebase, add kernel-doc, ensure non-NULL always
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/b08dc12a7e621a48ec35546d6cd1ed4b1434810d.1660553850.git.jani.nikula@intel.com
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/display/drm_dp_helper.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c index 32b295003f49..92990a3d577a 100644 --- a/drivers/gpu/drm/display/drm_dp_helper.c +++ b/drivers/gpu/drm/display/drm_dp_helper.c @@ -390,6 +390,38 @@ void drm_dp_link_train_channel_eq_delay(const struct drm_dp_aux *aux, } EXPORT_SYMBOL(drm_dp_link_train_channel_eq_delay); +/** + * drm_dp_phy_name() - Get the name of the given DP PHY + * @dp_phy: The DP PHY identifier + * + * Given the @dp_phy, get a user friendly name of the DP PHY, either "DPRX" or + * "LTTPR <N>", or "<INVALID DP PHY>" on errors. The returned string is always + * non-NULL and valid. + * + * Returns: Name of the DP PHY. + */ +const char *drm_dp_phy_name(enum drm_dp_phy dp_phy) +{ + static const char * const phy_names[] = { + [DP_PHY_DPRX] = "DPRX", + [DP_PHY_LTTPR1] = "LTTPR 1", + [DP_PHY_LTTPR2] = "LTTPR 2", + [DP_PHY_LTTPR3] = "LTTPR 3", + [DP_PHY_LTTPR4] = "LTTPR 4", + [DP_PHY_LTTPR5] = "LTTPR 5", + [DP_PHY_LTTPR6] = "LTTPR 6", + [DP_PHY_LTTPR7] = "LTTPR 7", + [DP_PHY_LTTPR8] = "LTTPR 8", + }; + + if (dp_phy < 0 || dp_phy >= ARRAY_SIZE(phy_names) || + WARN_ON(!phy_names[dp_phy])) + return "<INVALID DP PHY>"; + + return phy_names[dp_phy]; +} +EXPORT_SYMBOL(drm_dp_phy_name); + void drm_dp_lttpr_link_train_clock_recovery_delay(void) { usleep_range(100, 200); |