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drm: Add support for device_id based detection.
DP quirk list just compare sink or branch device's OUI so far. That means particular vendor's products will be applied specific change. This change would confirm device_id the same or not. Then driver can implement some changes for branch/sink device that really need additional WA. v2: use sizeof instead of hard coded '6' v3: add lost commit messages back for version 2 v4: send patch to both intel-gfx and dri-devel Cc: Jani Nikula <jani.nikula@intel.com> Cc: Cooper Chiou <cooper.chiou@intel.com> Cc: Matt Atwood <matthew.s.atwood@intel.com> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Cc: Clint Taylor <clinton.a.taylor@intel.com> Tested-by: Clint Taylor <clinton.a.taylor@intel.com> Signed-off-by: Lee, Shawn C <shawn.c.lee@intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/1536733371-25004-2-git-send-email-shawn.c.lee@intel.com
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1 changed files with 14 additions and 1 deletions
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@ -1257,15 +1257,20 @@ EXPORT_SYMBOL(drm_dp_stop_crc);
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struct dpcd_quirk {
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u8 oui[3];
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u8 device_id[6];
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bool is_branch;
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u32 quirks;
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};
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#define OUI(first, second, third) { (first), (second), (third) }
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#define DEVICE_ID(first, second, third, fourth, fifth, sixth) \
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{ (first), (second), (third), (fourth), (fifth), (sixth) }
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#define DEVICE_ID_ANY DEVICE_ID(0, 0, 0, 0, 0, 0)
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static const struct dpcd_quirk dpcd_quirk_list[] = {
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/* Analogix 7737 needs reduced M and N at HBR2 link rates */
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{ OUI(0x00, 0x22, 0xb9), true, BIT(DP_DPCD_QUIRK_LIMITED_M_N) },
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{ OUI(0x00, 0x22, 0xb9), DEVICE_ID_ANY, true, BIT(DP_DPCD_QUIRK_LIMITED_M_N) },
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};
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#undef OUI
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@ -1284,6 +1289,7 @@ drm_dp_get_quirks(const struct drm_dp_dpcd_ident *ident, bool is_branch)
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const struct dpcd_quirk *quirk;
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u32 quirks = 0;
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int i;
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u8 any_device[] = DEVICE_ID_ANY;
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for (i = 0; i < ARRAY_SIZE(dpcd_quirk_list); i++) {
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quirk = &dpcd_quirk_list[i];
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@ -1294,12 +1300,19 @@ drm_dp_get_quirks(const struct drm_dp_dpcd_ident *ident, bool is_branch)
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if (memcmp(quirk->oui, ident->oui, sizeof(ident->oui)) != 0)
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continue;
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if (memcmp(quirk->device_id, any_device, sizeof(any_device)) != 0 &&
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memcmp(quirk->device_id, ident->device_id, sizeof(ident->device_id)) != 0)
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continue;
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quirks |= quirk->quirks;
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}
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return quirks;
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}
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#undef DEVICE_ID_ANY
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#undef DEVICE_ID
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/**
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* drm_dp_read_desc - read sink/branch descriptor from DPCD
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* @aux: DisplayPort AUX channel
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