Hi Guenter
On 06/24/2016 10:10 AM, Guenter Roeck wrote:
Hi Chris,
On Thu, Jun 23, 2016 at 5:34 PM, Chris Zhong <z...@rock-chips.com> wrote:
Hi Guenter
On 06/24/2016 05:47 AM, Guenter Roeck wrote:
Hi Chris,
On Thu, Jun 23, 2016 at 5:51 AM, Chris Zhong <z...@rock-chips.com> wrote:
Add a PHY provider driver for the rk3399 SoC Type-c PHY. The USB
Type-C PHY is designed to support the USB3 and DP applications. The
PHY basically has two main components: USB3 and DisplyPort. USB3
operates in SuperSpeed mode and the DP can operate at RBR, HBR and
HBR2 data rates.
Signed-off-by: Chris Zhong <z...@rock-chips.com>
Signed-off-by: Kever Yang <kever.y...@rock-chips.com>
[ ... ]
+
+static void tcphy_get_state(struct rockchip_typec_phy *tcphy,
+ struct extcon_dev *edev)
+{
+ int mode;
+ bool plugged, flip, pin_assign, dfp, ufp, dp;
+
+ ufp = extcon_get_cable_state_(edev, EXTCON_USB);
+ dfp = extcon_get_cable_state_(edev, EXTCON_USB_HOST);
+ dp = extcon_get_cable_state_(edev, EXTCON_DISP_DP);
+ flip = extcon_get_cable_state_(edev, EXTCON_TYPEC_POLARITY);
+ pin_assign = extcon_get_cable_state_(edev,
EXTCON_TYPEC_PIN_ASSIGN);
+
+ plugged = ufp | dfp | dp;
+ tcphy->flip = flip;
+
+ if (plugged) {
+ if (ufp) {
+ mode = MODE_UFP_USB;
+ } else if (dfp && !dp) {
+ mode = MODE_DFP_USB;
+ } else if (dfp && dp) {
+ mode = MODE_DFP_USB | MODE_DFP_DP;
+ tcphy->pin_assign = pin_assign ? PIN_MAP_D :
PIN_MAP_B;
+ } else {
+ mode = MODE_DFP_DP;
+ tcphy->pin_assign = pin_assign ? PIN_MAP_C :
PIN_MAP_A;
I am having trouble extracting pin_assign from our code. What
determines if map A or C should be selected ?
Thanks,
Guenter
Oh, forgot rename the macro:
PIN_MAP_ should be PIN_ASSIGN_
IF EXTCON_TYPEC_PIN_ASSIGN is attached, Type-C get
Pin_Assignment_C(for DP only mode) or Pin_Assignment_D(for DP alt mode),
if detached, it get the default Assignment: A(for DP only mode) or B(for
DP alt mode),.
So we are really talking about DP only vs. DP Alt mode ? If so, do we
even need PIN_ASSIGN ? Why not just use EXTCON_DISP_DP_ALT directly ?
Also, I'll have to get a better understanding what "DP only mode" and
"DP Alt mode" actually means. DisplayPort is already a Type-C
alternate mode, so the terminology is a bit confusing. Do you happen
to have a description somewhere, by any chance ?
Thanks,
Guenter
The Pin Assignments is come from:
VESA DisplayPort Alt Mode on USB Type-C Standard
There are 2 mode for DP: DP only mode, and DP+USB3 mode(EXTCON_DISP_DP_ALT )
At DP only mode, DP has 4 lanes of Type-C;
At DP+USB3 mode, DP has 2 lanes, and USB3 has the other 2 lanes.
For DP only mode, there are 3 kind of pin assignments: A, C, E.
For DP + USB3 mode, there are 3 kind of pin assignments: B, D, F.
Pin Assignments C and D use the same assignments as Pin Assignments E and F.
Thence, we just need to distinguish A and C for DP only mode.
and distinguish B and D for DP + USB3 mode.
That why the phy need a PIN_ASSIGN cable.
The name of "DP Alt mode", it is DP+USB3 mode, actually.
I think if the name makes anyone confused, it can be changed to DP_USB3 mode:
The cable list could be:
EXTCON_DISP_DP
EXTCON_DISP_DP_USB3
I am going to add a comment for describe which PIN_ASSIGN_ should be
selected
in next version, if no one disagrees the usage of cable
