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Merge tag 'drm-intel-fixes-2021-05-27' of ssh://git.freedesktop.org/git/drm/drm-intel into drm-fixes

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drm/i915 fixes for v5.13-rc4:
- Re-enable LTTPR non-transparent LT mode for DPCD_REV<1.4

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/875yz4bnmj.fsf@intel.com
This commit is contained in:
Dave Airlie 2021-05-28 13:28:18 +10:00
commit aeeb517368
1 changed files with 33 additions and 38 deletions
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71
drivers/gpu/drm/i915/display/intel_dp_link_training.c
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@ -128,50 +128,14 @@ intel_dp_set_lttpr_transparent_mode(struct intel_dp *intel_dp, bool enable)
return drm_dp_dpcd_write(&intel_dp->aux, DP_PHY_REPEATER_MODE, &val, 1) == 1;
}
/**
* intel_dp_init_lttpr_and_dprx_caps - detect LTTPR and DPRX caps, init the LTTPR link training mode
* @intel_dp: Intel DP struct
*
* Read the LTTPR common and DPRX capabilities and switch to non-transparent
* link training mode if any is detected and read the PHY capabilities for all
* detected LTTPRs. In case of an LTTPR detection error or if the number of
* LTTPRs is more than is supported (8), fall back to the no-LTTPR,
* transparent mode link training mode.
*
* Returns:
* >0 if LTTPRs were detected and the non-transparent LT mode was set. The
* DPRX capabilities are read out.
* 0 if no LTTPRs or more than 8 LTTPRs were detected or in case of a
* detection failure and the transparent LT mode was set. The DPRX
* capabilities are read out.
* <0 Reading out the DPRX capabilities failed.
*/
int intel_dp_init_lttpr_and_dprx_caps(struct intel_dp *intel_dp)
static int intel_dp_init_lttpr(struct intel_dp *intel_dp)
{
int lttpr_count;
bool ret;
int i;
ret = intel_dp_read_lttpr_common_caps(intel_dp);
/* The DPTX shall read the DPRX caps after LTTPR detection. */
if (drm_dp_read_dpcd_caps(&intel_dp->aux, intel_dp->dpcd)) {
intel_dp_reset_lttpr_common_caps(intel_dp);
return -EIO;
}
if (!ret)
if (!intel_dp_read_lttpr_common_caps(intel_dp))
return 0;
/*
* The 0xF0000-0xF02FF range is only valid if the DPCD revision is
* at least 1.4.
*/
if (intel_dp->dpcd[DP_DPCD_REV] < 0x14) {
intel_dp_reset_lttpr_common_caps(intel_dp);
return 0;
}
lttpr_count = drm_dp_lttpr_count(intel_dp->lttpr_common_caps);
/*
* Prevent setting LTTPR transparent mode explicitly if no LTTPRs are
@ -211,6 +175,37 @@ int intel_dp_init_lttpr_and_dprx_caps(struct intel_dp *intel_dp)
return lttpr_count;
}
/**
* intel_dp_init_lttpr_and_dprx_caps - detect LTTPR and DPRX caps, init the LTTPR link training mode
* @intel_dp: Intel DP struct
*
* Read the LTTPR common and DPRX capabilities and switch to non-transparent
* link training mode if any is detected and read the PHY capabilities for all
* detected LTTPRs. In case of an LTTPR detection error or if the number of
* LTTPRs is more than is supported (8), fall back to the no-LTTPR,
* transparent mode link training mode.
*
* Returns:
* >0 if LTTPRs were detected and the non-transparent LT mode was set. The
* DPRX capabilities are read out.
* 0 if no LTTPRs or more than 8 LTTPRs were detected or in case of a
* detection failure and the transparent LT mode was set. The DPRX
* capabilities are read out.
* <0 Reading out the DPRX capabilities failed.
*/
int intel_dp_init_lttpr_and_dprx_caps(struct intel_dp *intel_dp)
{
int lttpr_count = intel_dp_init_lttpr(intel_dp);
/* The DPTX shall read the DPRX caps after LTTPR detection. */
if (drm_dp_read_dpcd_caps(&intel_dp->aux, intel_dp->dpcd)) {
intel_dp_reset_lttpr_common_caps(intel_dp);
return -EIO;
}
return lttpr_count;
}
EXPORT_SYMBOL(intel_dp_init_lttpr_and_dprx_caps);
static u8 dp_voltage_max(u8 preemph)