From: Jani Nikula <jani.nikula@intel.com> To: intel-gfx@lists.freedesktop.org Cc: jani.nikula@intel.com, manasi.d.navare@intel.com, ville.syrjala@linux.intel.com, dri-devel@lists.freedesktop.org Subject: [Intel-gfx] [PATCH 01/17] drm/dp: add DP 2.0 UHBR link rate and bw code conversions Date: Wed, 18 Aug 2021 21:10:36 +0300 [thread overview] Message-ID: <f51b67be0aa963ee2d4a2edeb7a070fd3254200b.1629310010.git.jani.nikula@intel.com> (raw) In-Reply-To: <cover.1629310010.git.jani.nikula@intel.com> The bw code equals link_rate / 0.27 Gbps only for 8b/10b link rates. Handle DP 2.0 UHBR rates as special cases, though this is not pretty. Cc: dri-devel@lists.freedesktop.org Signed-off-by: Jani Nikula <jani.nikula@intel.com> --- drivers/gpu/drm/drm_dp_helper.c | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index 6d0f2c447f3b..9b2a2961fca8 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -207,15 +207,33 @@ EXPORT_SYMBOL(drm_dp_lttpr_link_train_channel_eq_delay); u8 drm_dp_link_rate_to_bw_code(int link_rate) { - /* Spec says link_bw = link_rate / 0.27Gbps */ - return link_rate / 27000; + switch (link_rate) { + case 1000000: + return DP_LINK_BW_10; + case 1350000: + return DP_LINK_BW_13_5; + case 2000000: + return DP_LINK_BW_20; + default: + /* Spec says link_bw = link_rate / 0.27Gbps */ + return link_rate / 27000; + } } EXPORT_SYMBOL(drm_dp_link_rate_to_bw_code); int drm_dp_bw_code_to_link_rate(u8 link_bw) { - /* Spec says link_rate = link_bw * 0.27Gbps */ - return link_bw * 27000; + switch (link_bw) { + case DP_LINK_BW_10: + return 1000000; + case DP_LINK_BW_13_5: + return 1350000; + case DP_LINK_BW_20: + return 2000000; + default: + /* Spec says link_rate = link_bw * 0.27Gbps */ + return link_bw * 27000; + } } EXPORT_SYMBOL(drm_dp_bw_code_to_link_rate); -- 2.20.1
WARNING: multiple messages have this Message-ID (diff)
From: Jani Nikula <jani.nikula@intel.com> To: intel-gfx@lists.freedesktop.org Cc: jani.nikula@intel.com, manasi.d.navare@intel.com, ville.syrjala@linux.intel.com, dri-devel@lists.freedesktop.org Subject: [PATCH 01/17] drm/dp: add DP 2.0 UHBR link rate and bw code conversions Date: Wed, 18 Aug 2021 21:10:36 +0300 [thread overview] Message-ID: <f51b67be0aa963ee2d4a2edeb7a070fd3254200b.1629310010.git.jani.nikula@intel.com> (raw) In-Reply-To: <cover.1629310010.git.jani.nikula@intel.com> The bw code equals link_rate / 0.27 Gbps only for 8b/10b link rates. Handle DP 2.0 UHBR rates as special cases, though this is not pretty. Cc: dri-devel@lists.freedesktop.org Signed-off-by: Jani Nikula <jani.nikula@intel.com> --- drivers/gpu/drm/drm_dp_helper.c | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index 6d0f2c447f3b..9b2a2961fca8 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -207,15 +207,33 @@ EXPORT_SYMBOL(drm_dp_lttpr_link_train_channel_eq_delay); u8 drm_dp_link_rate_to_bw_code(int link_rate) { - /* Spec says link_bw = link_rate / 0.27Gbps */ - return link_rate / 27000; + switch (link_rate) { + case 1000000: + return DP_LINK_BW_10; + case 1350000: + return DP_LINK_BW_13_5; + case 2000000: + return DP_LINK_BW_20; + default: + /* Spec says link_bw = link_rate / 0.27Gbps */ + return link_rate / 27000; + } } EXPORT_SYMBOL(drm_dp_link_rate_to_bw_code); int drm_dp_bw_code_to_link_rate(u8 link_bw) { - /* Spec says link_rate = link_bw * 0.27Gbps */ - return link_bw * 27000; + switch (link_bw) { + case DP_LINK_BW_10: + return 1000000; + case DP_LINK_BW_13_5: + return 1350000; + case DP_LINK_BW_20: + return 2000000; + default: + /* Spec says link_rate = link_bw * 0.27Gbps */ + return link_bw * 27000; + } } EXPORT_SYMBOL(drm_dp_bw_code_to_link_rate); -- 2.20.1
next prev parent reply other threads:[~2021-08-18 18:11 UTC|newest] Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-08-18 18:10 [Intel-gfx] [PATCH 00/17] drm/i915/dp: dp 2.0 enabling prep work Jani Nikula 2021-08-18 18:10 ` Jani Nikula [this message] 2021-08-18 18:10 ` [PATCH 01/17] drm/dp: add DP 2.0 UHBR link rate and bw code conversions Jani Nikula 2021-08-19 16:51 ` Ville Syrjälä 2021-08-19 16:51 ` [Intel-gfx] " Ville Syrjälä 2021-08-18 18:10 ` [Intel-gfx] [PATCH 02/17] drm/dp: use more of the extended receiver cap Jani Nikula 2021-08-18 18:10 ` Jani Nikula 2021-08-18 18:10 ` [PATCH 03/17] drm/dp: add LTTPR DP 2.0 DPCD addresses Jani Nikula 2021-08-18 18:10 ` [Intel-gfx] " Jani Nikula 2021-08-18 18:10 ` [Intel-gfx] [PATCH 04/17] drm/dp: add helper for extracting adjust 128b/132b TX FFE preset Jani Nikula 2021-08-18 18:10 ` Jani Nikula 2021-08-19 17:30 ` Ville Syrjälä 2021-08-19 17:30 ` [Intel-gfx] " Ville Syrjälä 2021-08-18 18:10 ` [Intel-gfx] [PATCH 05/17] drm/i915/dp: use actual link rate values in struct link_config_limits Jani Nikula 2021-08-19 17:34 ` Ville Syrjälä 2021-08-18 18:10 ` [Intel-gfx] [PATCH 06/17] drm/i915/dp: read sink UHBR rates Jani Nikula 2021-08-19 17:45 ` Ville Syrjälä 2021-08-18 18:10 ` [Intel-gfx] [PATCH 07/17] drm/i915/dg2: add TRANS_DP2_CTL register definition Jani Nikula 2021-08-18 18:10 ` [Intel-gfx] [PATCH 08/17] drm/i915/dg2: add DG2+ TRANS_DDI_FUNC_CTL DP 2.0 128b/132b mode Jani Nikula 2021-08-18 18:10 ` [Intel-gfx] [PATCH 09/17] drm/i915/dg2: add TRANS_DP2_VFREQHIGH and TRANS_DP2_VFREQLOW Jani Nikula 2021-08-18 18:10 ` [Intel-gfx] [PATCH 10/17] drm/i915/dg2: add DG2 UHBR source rates Jani Nikula 2021-08-18 18:10 ` [Intel-gfx] [PATCH 11/17] drm/i915/dp: add max data rate calculation for UHBR rates Jani Nikula 2021-08-18 18:10 ` [Intel-gfx] [PATCH 12/17] drm/i915/dp: use 128b/132b TPS2 for UHBR+ link rates Jani Nikula 2021-08-18 18:10 ` [Intel-gfx] [PATCH 13/17] drm/i915/dp: select 128b/132b channel encoding for UHBR rates Jani Nikula 2021-08-19 17:49 ` Ville Syrjälä 2021-08-20 6:36 ` Jani Nikula 2021-08-18 18:10 ` [Intel-gfx] [PATCH 14/17] drm/i915/dg2: configure TRANS_DP2_CTL for DP 2.0 Jani Nikula 2021-08-18 18:10 ` [Intel-gfx] [PATCH 15/17] drm/i915/dg2: use 128b/132b transcoder DDI mode Jani Nikula 2021-08-19 17:54 ` Ville Syrjälä 2021-08-18 18:10 ` [Intel-gfx] [PATCH 16/17] drm/i915/dg2: configure TRANS_DP2_VFREQ{HIGH, LOW} for 128b/132b Jani Nikula 2021-08-18 18:10 ` [Intel-gfx] [PATCH 17/17] drm/i915/dg2: update link training " Jani Nikula 2021-08-18 20:19 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for drm/i915/dp: dp 2.0 enabling prep work Patchwork 2021-08-18 20:21 ` [Intel-gfx] ✗ Fi.CI.SPARSE: " Patchwork 2021-08-18 20:49 ` [Intel-gfx] ✓ Fi.CI.BAT: success " Patchwork
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=f51b67be0aa963ee2d4a2edeb7a070fd3254200b.1629310010.git.jani.nikula@intel.com \ --to=jani.nikula@intel.com \ --cc=dri-devel@lists.freedesktop.org \ --cc=intel-gfx@lists.freedesktop.org \ --cc=manasi.d.navare@intel.com \ --cc=ville.syrjala@linux.intel.com \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.