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Thu, 14 Mar 2024 19:12:16 -0700 Received: from mtkmbs11n1.mediatek.inc (172.21.101.185) by mtkmbs10n2.mediatek.inc (172.21.101.183) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Fri, 15 Mar 2024 09:51:39 +0800 Received: from mszsdhlt06.gcn.mediatek.inc (10.16.6.206) by mtkmbs11n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Fri, 15 Mar 2024 09:51:38 +0800 From: Liankun Yang To: , , , , , , , , CC: , , , Subject: [PATCH v1 1/1] drm/mediatek/ dp: Adjust bandwidth limit for DP Date: Fri, 15 Mar 2024 09:52:26 +0800 Message-ID: <20240315015233.2023-1-liankun.yang@mediatek.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 X-TM-AS-Product-Ver: SMEX-14.0.0.3152-9.1.1006-23728.005 X-TM-AS-Result: No-10--3.870500-8.000000 X-TMASE-MatchedRID: aNLZUNMgA8DqDJGloYB7/lu4M/xm4KZeB3WB/vm5tBhvOxpHnc6c8tAO OSAF0cTNjhjs4bjZeL60WiAfCTDLxQDNPxu11HXj4pdq9sdj8LVYN1akkye0qOWPsfbn1jth8TF JvgPXI7A4hXsmqdKfO3aeDhnWViUE0lwI2rCt62G4jAucHcCqncnlJe2gk8vI6dkNekyzYlk+xn rY8SIOUkT88A7P9JJ2kiyjM1Ze4W0Pv5/+N9RjErqQyAveNtg65hCwQ3LNHZ2HegbyfstkOnnUb FaXoymeQc1jtbpiLH2AMuqetGVetnyef22ep6XYymsk/wUE4hqrBS4T8labToBwhkOTCouh1zSU gYfoEuN+67+mR/pqXYPIuqi1bh4/LrruoM7sUMSL8WaUGCH4mw5CO1gbP3VdOM8jHJvq79Wbjw+ lQ+OHZvNho9kAt8htLJl1Svx/Hh8xu7K+8aG0gLDxBQ/q2QPNQwymtxuJ6y0= X-TM-AS-User-Approved-Sender: No X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--3.870500-8.000000 X-TMASE-Version: SMEX-14.0.0.3152-9.1.1006-23728.005 X-TM-SNTS-SMTP: 2C05BDA06252C926B0A273E8E84954F6A0B77910A9C2749658F0FB14B43045232000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240314_191224_262575_E5F2BB0D X-CRM114-Status: GOOD ( 13.60 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org By adjusting the order of link training and relocating it to HPD, link training can identify the usability of each lane in the current link. It also supports handling signal instability and weakness due to environmental issues, enabling the acquisition of a stable bandwidth for the current link. Subsequently, DP work can proceed based on the actual maximum bandwidth. It should training in the hpd event thread. Check the mode with lane count and link rate of training. Signed-off-by: Liankun Yang --- drivers/gpu/drm/mediatek/mtk_dp.c | 57 +++++++++++++++---------------- 1 file changed, 28 insertions(+), 29 deletions(-) diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c index 2136a596efa1..14da6077f947 100644 --- a/drivers/gpu/drm/mediatek/mtk_dp.c +++ b/drivers/gpu/drm/mediatek/mtk_dp.c @@ -1870,6 +1870,7 @@ static irqreturn_t mtk_dp_hpd_event_thread(int hpd, void *dev) struct mtk_dp *mtk_dp = dev; unsigned long flags; u32 status; + int ret; if (mtk_dp->need_debounce && mtk_dp->train_info.cable_plugged_in) msleep(100); @@ -1888,9 +1889,28 @@ static irqreturn_t mtk_dp_hpd_event_thread(int hpd, void *dev) memset(&mtk_dp->info.audio_cur_cfg, 0, sizeof(mtk_dp->info.audio_cur_cfg)); + mtk_dp->enabled = false; + /* power off aux */ + mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE, + DP_PWR_STATE_BANDGAP_TPLL, + DP_PWR_STATE_MASK); + mtk_dp->need_debounce = false; mod_timer(&mtk_dp->debounce_timer, jiffies + msecs_to_jiffies(100) - 1); + } else { + mtk_dp_aux_panel_poweron(mtk_dp, true); + + ret = mtk_dp_parse_capabilities(mtk_dp); + if (ret) + drm_err(mtk_dp->drm_dev, "Can't parse capabilities\n"); + + /* Training */ + ret = mtk_dp_training(mtk_dp); + if (ret) + drm_err(mtk_dp->drm_dev, "Training failed, %d\n", ret); + + mtk_dp->enabled = true; } } @@ -2057,16 +2077,6 @@ static struct edid *mtk_dp_get_edid(struct drm_bridge *bridge, new_edid = drm_get_edid(connector, &mtk_dp->aux.ddc); - /* - * Parse capability here to let atomic_get_input_bus_fmts and - * mode_valid use the capability to calculate sink bitrates. - */ - if (mtk_dp_parse_capabilities(mtk_dp)) { - drm_err(mtk_dp->drm_dev, "Can't parse capabilities\n"); - kfree(new_edid); - new_edid = NULL; - } - if (new_edid) { struct cea_sad *sads; @@ -2243,14 +2253,10 @@ static void mtk_dp_bridge_atomic_enable(struct drm_bridge *bridge, return; } - mtk_dp_aux_panel_poweron(mtk_dp, true); - - /* Training */ - ret = mtk_dp_training(mtk_dp); - if (ret) { - drm_err(mtk_dp->drm_dev, "Training failed, %d\n", ret); - goto power_off_aux; - } + /* power on aux */ + mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE, + DP_PWR_STATE_BANDGAP_TPLL_LANE, + DP_PWR_STATE_MASK); ret = mtk_dp_video_config(mtk_dp); if (ret) @@ -2269,7 +2275,6 @@ static void mtk_dp_bridge_atomic_enable(struct drm_bridge *bridge, sizeof(mtk_dp->info.audio_cur_cfg)); } - mtk_dp->enabled = true; mtk_dp_update_plugged_status(mtk_dp); return; @@ -2284,16 +2289,10 @@ static void mtk_dp_bridge_atomic_disable(struct drm_bridge *bridge, { struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge); - mtk_dp->enabled = false; mtk_dp_update_plugged_status(mtk_dp); mtk_dp_video_enable(mtk_dp, false); mtk_dp_audio_mute(mtk_dp, true); - if (mtk_dp->train_info.cable_plugged_in) { - drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D3); - usleep_range(2000, 3000); - } - /* power off aux */ mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE, DP_PWR_STATE_BANDGAP_TPLL, @@ -2310,10 +2309,10 @@ mtk_dp_bridge_mode_valid(struct drm_bridge *bridge, { struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge); u32 bpp = info->color_formats & DRM_COLOR_FORMAT_YCBCR422 ? 16 : 24; - u32 rate = min_t(u32, drm_dp_max_link_rate(mtk_dp->rx_cap) * - drm_dp_max_lane_count(mtk_dp->rx_cap), - drm_dp_bw_code_to_link_rate(mtk_dp->max_linkrate) * - mtk_dp->max_lanes); + + u32 lane_count_min = mtk_dp->train_info.lane_count; + u32 rate = drm_dp_bw_code_to_link_rate(mtk_dp->train_info.link_rate) * + lane_count_min; if (rate < mode->clock * bpp / 8) return MODE_CLOCK_HIGH;