[PATCH v8 18/19] drm/mediatek: change the aux retries times when receiving AUX_DEFER
From: Guillaume Ranquet <hidden>
Date: 2022-02-18 14:58:12
Also in:
dri-devel, linux-devicetree, linux-fbdev, linux-mediatek, linux-phy, lkml
Subsystem:
drm drivers, drm drivers for mediatek, the rest · Maintainers:
David Airlie, Simona Vetter, Chun-Kuang Hu, Philipp Zabel, Linus Torvalds
From: Jitao Shi <redacted> 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 <redacted> Signed-off-by: Guillaume Ranquet <redacted> --- drivers/gpu/drm/mediatek/mtk_dp.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c
index fe91ab8b2fd89..4e880d8a8a186 100644
--- a/drivers/gpu/drm/mediatek/mtk_dp.c
+++ b/drivers/gpu/drm/mediatek/mtk_dp.c@@ -1879,7 +1879,7 @@ 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);
@@ -1913,15 +1913,21 @@ 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 = 7; + 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; + msleep(50); } } else { while (accessed_bytes < msg->size) { size_t to_access = min_t(size_t, DP_AUX_MAX_PAYLOAD_BYTES, msg->size - accessed_bytes); + retry = 7; while (retry--) { ret = mtk_dp_aux_do_transfer(mtk_dp, is_read, request,
--
2.34.1
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