| Message ID | 20220327223927.20848-22-granquet@baylibre.com (mailing list archive) |
|---|---|
| State | Handled Elsewhere |
| Headers | show |
| Series | drm/mediatek: Add mt8195 DisplayPort driver | expand |
On Mon, 2022-03-28 at 00:39 +0200, Guillaume Ranquet wrote: > From: Jitao Shi <jitao.shi@mediatek.com> > > 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 <jitao.shi@mediatek.com> > Signed-off-by: Guillaume Ranquet <granquet@baylibre.com> > --- > 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 <rex-bc.chen@mediatek.com>
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,