Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755000AbbLGGlo (ORCPT ); Mon, 7 Dec 2015 01:41:44 -0500 Received: from lucky1.263xmail.com ([211.157.147.132]:44083 "EHLO lucky1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754935AbbLGGll (ORCPT ); Mon, 7 Dec 2015 01:41:41 -0500 X-263anti-spam: KSV:0; X-MAIL-GRAY: 1 X-MAIL-DELIVERY: 0 X-KSVirus-check: 0 X-ABS-CHECKED: 4 X-ADDR-CHECKED: 0 X-RL-SENDER: ykk@rock-chips.com X-FST-TO: inki.dae@samsung.com X-SENDER-IP: 103.29.142.67 X-LOGIN-NAME: ykk@rock-chips.com X-UNIQUE-TAG: X-ATTACHMENT-NUM: 0 X-DNS-TYPE: 0 From: Yakir Yang To: Inki Dae , Mark Yao , Jingoo Han , Heiko Stuebner Cc: Thierry Reding , Krzysztof Kozlowski , Rob Herring , Andrzej Hajda , Joonyoung Shim , Seung-Woo Kim , Kyungmin Park , Russell King , emil.l.velikov@gmail.com, Gustavo Padovan , Kishon Vijay Abraham I , ajaynumb@gmail.com, javier@osg.samsung.com, Andy Yan , Yakir Yang , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v10 17/17] drm: bridge: analogix/dp: expand the look time for waiting AUX CH reply Date: Mon, 7 Dec 2015 14:41:06 +0800 Message-Id: <1449470466-31649-1-git-send-email-ykk@rock-chips.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1449470239-30667-1-git-send-email-ykk@rock-chips.com> References: <1449470239-30667-1-git-send-email-ykk@rock-chips.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1949 Lines: 52 After test on rockchiop platform, i found sometims driver would failed at reading EDID message. After debugging more, i found that it's okay to read_a byte from i2c, but it would failed at AUX transcation if we try to ready multi-bytes from i2c. Driver just can't received the AUX CH reply command, even no AUX error code. I may guess that the AUX wait time is not enough, so I try to expand the AUX wait time, and i do see this could fix the EDID read failed at rockchip platform. And I thought that expand the wait time won't hurt Exynos platform too much, cause Exynos didn't have this problem, then driver would received the reply command very soon, so no more additional wait time would bring to Exynos platform. Signed-off-by: Yakir Yang --- Changes in v10: None Changes in v9: None Changes in v8: None Changes in v7: None Changes in v6: None Changes in v5: None Changes in v4: None Changes in v3: None Changes in v2: None drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c index c7e2959..dc376bd 100644 --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c @@ -482,7 +482,7 @@ int analogix_dp_start_aux_transaction(struct analogix_dp_device *dp) reg = readl(dp->reg_base + ANALOGIX_DP_INT_STA); while (!(reg & RPLY_RECEIV)) { timeout_loop++; - if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) { + if (DP_TIMEOUT_LOOP_COUNT * 10 < timeout_loop) { dev_err(dp->dev, "AUX CH command reply failed!\n"); return -ETIMEDOUT; } -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/