[PATCH v3] drm/amd/display: Fix AppleDongle can't be detected

2019-12-10 Thread Louis Li
[Why] External monitor cannot be displayed consistently, if connecting via this Apple dongle (A1621, USB Type-C to HDMI). Experiments prove that the dongle needs 200ms at least to be ready for communication, after it drives HPDsignal high, and DPCD cannot be read correctly during the period, even r

Re: [PATCH v3] drm/amd/display: Fix AppleDongle can't be detected

2019-12-17 Thread Harry Wentland
On 2019-12-11 2:33 a.m., Louis Li wrote: > [Why] > External monitor cannot be displayed consistently, if connecting > via this Apple dongle (A1621, USB Type-C to HDMI). > Experiments prove that the dongle needs 200ms at least to be ready > for communication, after it drives HPDsignal high, and DPCD

Re: [PATCH v3] drm/amd/display: Fix AppleDongle can't be detected

2019-12-18 Thread Louis Li
On Tue, Dec 17, 2019 at 10:57:11AM -0500, Harry Wentland wrote: > On 2019-12-11 2:33 a.m., Louis Li wrote: > > [Why] > > External monitor cannot be displayed consistently, if connecting > > via this Apple dongle (A1621, USB Type-C to HDMI). > > Experiments prove that the dongle needs 200ms at least

Re: [PATCH v3] drm/amd/display: Fix AppleDongle can't be detected

2019-12-23 Thread Louis Li
On Tue, Dec 17, 2019 at 10:57:11AM -0500, Harry Wentland wrote: > On 2019-12-11 2:33 a.m., Louis Li wrote: > > [Why] > > External monitor cannot be displayed consistently, if connecting > > via this Apple dongle (A1621, USB Type-C to HDMI). > > Experiments prove that the dongle needs 200ms at least