If AMD decided to simply leave their driver as closed-source blob, they would not have this problem. But all the Linux fanboys that they want AMD to open source their graphics drivers. Just to state one thing clear: AMD already released specifications beforehand such that the kernel developers could have developed an independent graphics driver if they wanted. But it is better to shitstorm companies not to develop a driver than to sully one's hands.
AMD was nice and did its job. But instead of being satisfied with the result they now want AMD to start playing the political game with them (for the protocol: IMHO the correct thing to do would be to bring the driver to the staging area and now it's part of the kernel developers to sully their hands to bring the part up to the standards they want).
NVidia simply refuses to open source their drivers and does not get into this kind of trouble. Lesson learned: Never negotiate with terrorists.