Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S967582AbeAORYq (ORCPT + 1 other); Mon, 15 Jan 2018 12:24:46 -0500 Received: from bhuna.collabora.co.uk ([46.235.227.227]:57728 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S966781AbeAORRJ (ORCPT ); Mon, 15 Jan 2018 12:17:09 -0500 From: Thierry Escande To: Archit Taneja , Inki Dae , Thierry Reding , Sandy Huang , Sean Paul , David Airlie Cc: Tomasz Figa , Haixia Shi , =?UTF-8?q?=C3=98rjan=20Eide?= , zain wang , Yakir Yang , Lin Huang , Douglas Anderson , Mark Yao , linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, dri-devel@lists.freedesktop.org Subject: [PATCH 22/40] drm/bridge: analogix_dp: Check dpcd write/read status Date: Mon, 15 Jan 2018 18:15:56 +0100 Message-Id: <20180115171614.14474-23-thierry.escande@collabora.com> X-Mailer: git-send-email 2.14.1 In-Reply-To: <20180115171614.14474-1-thierry.escande@collabora.com> References: <20180115171614.14474-1-thierry.escande@collabora.com> MIME-Version: 1.0 Content-Type: text/plain; charset = "utf-8" Content-Transfert-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: From: Lin Huang We need to check the dpcd write/read return value to see whether the write/read was successful Cc: Kristian H. Kristensen Signed-off-by: Lin Huang Signed-off-by: zain wang Signed-off-by: Douglas Anderson Signed-off-by: Sean Paul Signed-off-by: Thierry Escande Reviewed-by: Andrzej Hajda --- drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 181 +++++++++++++++------ 1 file changed, 132 insertions(+), 49 deletions(-) diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c index 846574d0dcb0..501f7b4a23d6 100644 --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c @@ -160,80 +160,135 @@ int analogix_dp_disable_psr(struct analogix_dp_device *dp) } EXPORT_SYMBOL_GPL(analogix_dp_disable_psr); -static bool analogix_dp_detect_sink_psr(struct analogix_dp_device *dp) +static int analogix_dp_detect_sink_psr(struct analogix_dp_device *dp) { unsigned char psr_version; + int ret; + + ret = drm_dp_dpcd_readb(&dp->aux, DP_PSR_SUPPORT, &psr_version); + if (ret != 1) { + dev_err(dp->dev, "failed to get PSR version, disable it\n"); + return ret; + } - drm_dp_dpcd_readb(&dp->aux, DP_PSR_SUPPORT, &psr_version); dev_dbg(dp->dev, "Panel PSR version : %x\n", psr_version); - return (psr_version & DP_PSR_IS_SUPPORTED) ? true : false; + dp->psr_enable = (psr_version & DP_PSR_IS_SUPPORTED) ? true : false; + + return 0; } -static void analogix_dp_enable_sink_psr(struct analogix_dp_device *dp) +static int analogix_dp_enable_sink_psr(struct analogix_dp_device *dp) { unsigned char psr_en; + int ret; /* Disable psr function */ - drm_dp_dpcd_readb(&dp->aux, DP_PSR_EN_CFG, &psr_en); + ret = drm_dp_dpcd_readb(&dp->aux, DP_PSR_EN_CFG, &psr_en); + if (ret != 1) { + dev_err(dp->dev, "failed to get psr config\n"); + goto end; + } + psr_en &= ~DP_PSR_ENABLE; - drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en); + ret = drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en); + if (ret != 1) { + dev_err(dp->dev, "failed to disable panel psr\n"); + goto end; + } /* Main-Link transmitter remains active during PSR active states */ psr_en = DP_PSR_MAIN_LINK_ACTIVE | DP_PSR_CRC_VERIFICATION; - drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en); + ret = drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en); + if (ret != 1) { + dev_err(dp->dev, "failed to set panel psr\n"); + goto end; + } /* Enable psr function */ psr_en = DP_PSR_ENABLE | DP_PSR_MAIN_LINK_ACTIVE | DP_PSR_CRC_VERIFICATION; - drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en); + ret = drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en); + if (ret != 1) { + dev_err(dp->dev, "failed to set panel psr\n"); + goto end; + } analogix_dp_enable_psr_crc(dp); + + return 0; +end: + dev_err(dp->dev, "enable psr fail, force to disable psr\n"); + dp->psr_enable = false; + + return ret; } -static void +static int analogix_dp_enable_rx_to_enhanced_mode(struct analogix_dp_device *dp, bool enable) { u8 data; + int ret; - drm_dp_dpcd_readb(&dp->aux, DP_LANE_COUNT_SET, &data); + ret = drm_dp_dpcd_readb(&dp->aux, DP_LANE_COUNT_SET, &data); + if (ret < 0) + return ret; if (enable) - drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET, - DP_LANE_COUNT_ENHANCED_FRAME_EN | - DPCD_LANE_COUNT_SET(data)); + ret = drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET, + DP_LANE_COUNT_ENHANCED_FRAME_EN | + DPCD_LANE_COUNT_SET(data)); else - drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET, - DPCD_LANE_COUNT_SET(data)); + ret = drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET, + DPCD_LANE_COUNT_SET(data)); + + return ret < 0 ? ret : 0; } -static int analogix_dp_is_enhanced_mode_available(struct analogix_dp_device *dp) +static int analogix_dp_is_enhanced_mode_available(struct analogix_dp_device *dp, + u8 *enhanced_mode_support) { u8 data; - int retval; + int ret; - drm_dp_dpcd_readb(&dp->aux, DP_MAX_LANE_COUNT, &data); - retval = DPCD_ENHANCED_FRAME_CAP(data); + ret = drm_dp_dpcd_readb(&dp->aux, DP_MAX_LANE_COUNT, &data); + if (ret < 0) + return ret; - return retval; + *enhanced_mode_support = DPCD_ENHANCED_FRAME_CAP(data); + + return 0; } -static void analogix_dp_set_enhanced_mode(struct analogix_dp_device *dp) +static int analogix_dp_set_enhanced_mode(struct analogix_dp_device *dp) { u8 data; + int ret; + + ret = analogix_dp_is_enhanced_mode_available(dp, &data); + if (ret < 0) + return ret; + + ret = analogix_dp_enable_rx_to_enhanced_mode(dp, data); + if (ret < 0) + return ret; - data = analogix_dp_is_enhanced_mode_available(dp); - analogix_dp_enable_rx_to_enhanced_mode(dp, data); analogix_dp_enable_enhanced_mode(dp, data); + + return 0; } -static void analogix_dp_training_pattern_dis(struct analogix_dp_device *dp) +static int analogix_dp_training_pattern_dis(struct analogix_dp_device *dp) { + int retval; + analogix_dp_set_training_pattern(dp, DP_NONE); - drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, - DP_TRAINING_PATTERN_DISABLE); + retval = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, + DP_TRAINING_PATTERN_DISABLE); + + return retval < 0 ? retval : 0; } static void @@ -282,7 +337,11 @@ static int analogix_dp_link_start(struct analogix_dp_device *dp) if (retval < 0) return retval; /* set enhanced mode if available */ - analogix_dp_set_enhanced_mode(dp); + retval = analogix_dp_set_enhanced_mode(dp); + if (retval < 0) { + dev_err(dp->dev, "failed to set enhance mode\n"); + return retval; + } /* Set TX pre-emphasis to minimum */ for (lane = 0; lane < lane_count; lane++) @@ -567,10 +626,11 @@ static int analogix_dp_process_equalizer_training(struct analogix_dp_device *dp) if (!analogix_dp_channel_eq_ok(link_status, link_align, lane_count)) { /* traing pattern Set to Normal */ - analogix_dp_training_pattern_dis(dp); + retval = analogix_dp_training_pattern_dis(dp); + if (retval < 0) + return retval; dev_info(dp->dev, "Link Training success!\n"); - analogix_dp_get_link_bandwidth(dp, ®); dp->link_train.link_rate = reg; dev_dbg(dp->dev, "final bandwidth = %.2x\n", @@ -807,7 +867,6 @@ static int analogix_dp_train_link(struct analogix_dp_device *dp) static int analogix_dp_config_video(struct analogix_dp_device *dp) { - int retval = 0; int timeout_loop = 0; int done_count = 0; @@ -825,8 +884,9 @@ static int analogix_dp_config_video(struct analogix_dp_device *dp) if (analogix_dp_is_slave_video_stream_clock_on(dp) == 0) break; if (timeout_loop > DP_TIMEOUT_LOOP_COUNT) { - dev_err(dp->dev, "Timeout of slave video streamclk ok\n"); - return -ETIMEDOUT; + dev_warn(dp->dev, + "Ignoring timeout of slave video streamclk ok\n"); + break; } usleep_range(1000, 1001); } @@ -865,30 +925,38 @@ static int analogix_dp_config_video(struct analogix_dp_device *dp) usleep_range(1000, 1001); } - if (retval != 0) - dev_err(dp->dev, "Video stream is not detected!\n"); - - return retval; + return 0; } -static void analogix_dp_enable_scramble(struct analogix_dp_device *dp, - bool enable) +static int analogix_dp_enable_scramble(struct analogix_dp_device *dp, + bool enable) { u8 data; + int ret; if (enable) { analogix_dp_enable_scrambling(dp); - drm_dp_dpcd_readb(&dp->aux, DP_TRAINING_PATTERN_SET, &data); - drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, + ret = drm_dp_dpcd_readb(&dp->aux, DP_TRAINING_PATTERN_SET, + &data); + if (ret != 1) + return ret; + + ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, (u8)(data & ~DP_LINK_SCRAMBLING_DISABLE)); } else { analogix_dp_disable_scrambling(dp); - drm_dp_dpcd_readb(&dp->aux, DP_TRAINING_PATTERN_SET, &data); - drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, + ret = drm_dp_dpcd_readb(&dp->aux, DP_TRAINING_PATTERN_SET, + &data); + if (ret != 1) + return ret; + + ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, (u8)(data | DP_LINK_SCRAMBLING_DISABLE)); } + + return ret < 0 ? ret : 0; } static irqreturn_t analogix_dp_hardirq(int irq, void *arg) @@ -943,23 +1011,36 @@ static int analogix_dp_commit(struct analogix_dp_device *dp) return ret; } - analogix_dp_enable_scramble(dp, 1); + ret = analogix_dp_enable_scramble(dp, 1); + if (ret < 0) { + dev_err(dp->dev, "can not enable scramble\n"); + return ret; + } analogix_dp_init_video(dp); ret = analogix_dp_config_video(dp); - if (ret) + if (ret) { dev_err(dp->dev, "unable to config video\n"); + return ret; + } /* Safe to enable the panel now */ if (dp->plat_data->panel) { - if (drm_panel_enable(dp->plat_data->panel)) + ret = drm_panel_enable(dp->plat_data->panel); + if (ret) { DRM_ERROR("failed to enable the panel\n"); + return ret; + } } - dp->psr_enable = analogix_dp_detect_sink_psr(dp); + ret = analogix_dp_detect_sink_psr(dp); + if (ret) + return ret; + if (dp->psr_enable) - analogix_dp_enable_sink_psr(dp); - return 0; + ret = analogix_dp_enable_sink_psr(dp); + + return ret; } /* @@ -1186,8 +1267,10 @@ static int analogix_dp_set_bridge(struct analogix_dp_device *dp) } ret = analogix_dp_commit(dp); - if (ret) + if (ret) { + DRM_ERROR("dp commit error, ret = %d\n", ret); goto out_dp_init; + } enable_irq(dp->irq); return 0; -- 2.14.1