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Mon, 28 Mar 2022 09:46:06 +0800 Received: from mtksdccf07 (172.21.84.99) by mtkcas11.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Mon, 28 Mar 2022 09:46:06 +0800 Message-ID: Subject: Re: [PATCH v9 21/22] drm/mediatek: change the aux retries times when receiving AUX_DEFER From: Rex-BC Chen To: Guillaume Ranquet , , , , , , , , , , , , , , , , , CC: , , , , , , , Date: Mon, 28 Mar 2022 09:46:06 +0800 In-Reply-To: <20220327223927.20848-22-granquet@baylibre.com> References: <20220327223927.20848-1-granquet@baylibre.com> <20220327223927.20848-22-granquet@baylibre.com> X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220327_184840_354196_68A735B9 X-CRM114-Status: GOOD ( 16.59 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, 2022-03-28 at 00:39 +0200, Guillaume Ranquet wrote: > From: Jitao Shi > > DP 1.4a Section 2.8.7.1.5.6.1: > A DP Source device shall retry at least seven times upon receiving > AUX_DEFER before giving up the AUX transaction. > > Aux should retry to send msg whether how many bytes. > > Signed-off-by: Jitao Shi > Signed-off-by: Guillaume Ranquet > --- > drivers/gpu/drm/mediatek/mtk_dp.c | 17 ++++++++++++----- > 1 file changed, 12 insertions(+), 5 deletions(-) > > diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c > b/drivers/gpu/drm/mediatek/mtk_dp.c > index e099491cc6a4..7a197c4a7143 100644 > --- a/drivers/gpu/drm/mediatek/mtk_dp.c > +++ b/drivers/gpu/drm/mediatek/mtk_dp.c > @@ -2016,7 +2016,7 @@ static ssize_t mtk_dp_aux_transfer(struct > drm_dp_aux *mtk_aux, > bool is_read; > u8 request; > size_t accessed_bytes = 0; > - int retry = 3, ret = 0; > + int retry, ret = 0; > > mtk_dp = container_of(mtk_aux, struct mtk_dp, aux); > > @@ -2050,14 +2050,21 @@ static ssize_t mtk_dp_aux_transfer(struct > drm_dp_aux *mtk_aux, > } > > if (msg->size == 0) { > - ret = mtk_dp_aux_do_transfer(mtk_dp, is_read, request, > - msg->address + > accessed_bytes, > - msg->buffer + > accessed_bytes, 0); > + retry = 32; > + while (retry--) { > + ret = mtk_dp_aux_do_transfer(mtk_dp, is_read, > request, > + msg->address + > accessed_bytes, > + msg->buffer + > accessed_bytes, 0); > + if (ret == 0) > + break; > + usleep_range(500, 600); > + } > } else { > while (accessed_bytes < msg->size) { > size_t to_access = > min_t(size_t, DP_AUX_MAX_PAYLOAD_BYTES, > msg->size - accessed_bytes); > + retry = 32; > while (retry--) { > ret = mtk_dp_aux_do_transfer(mtk_dp, > is_read, > request, > @@ -2066,7 +2073,7 @@ static ssize_t mtk_dp_aux_transfer(struct > drm_dp_aux *mtk_aux, > to_access) > ; > if (ret == 0) > break; > - usleep_range(50, 100); > + usleep_range(500, 600); > } > if (!retry || ret) { > drm_info(mtk_dp->drm_dev, Reviewed-by: Rex-BC Chen _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel