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drm/dp: add drm_dp_phy_name() for getting DP PHY name

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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
This commit is contained in:
Jani Nikula 2022-08-15 11:58:34 +03:00
parent 55453c0914
commit 5b04aab6d4
2 changed files with 34 additions and 0 deletions
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32
drivers/gpu/drm/display/drm_dp_helper.c
View File

@ -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);

2
include/drm/display/drm_dp_helper.h
View File

@ -69,6 +69,8 @@ bool drm_dp_128b132b_link_training_failed(const u8 link_status[DP_LINK_STATUS_SI
u8 drm_dp_link_rate_to_bw_code(int link_rate);
int drm_dp_bw_code_to_link_rate(u8 link_bw);
const char *drm_dp_phy_name(enum drm_dp_phy dp_phy);
/**
* struct drm_dp_vsc_sdp - drm DP VSC SDP
*