<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW --- - Radeon: evergreen Atombios in loop during initialization on ppc64" href="https://bugs.freedesktop.org/show_bug.cgi?id=59982#c12">Comment # 12</a> on <a class="bz_bug_link bz_status_NEW " title="NEW --- - Radeon: evergreen Atombios in loop during initialization on ppc64" href="https://bugs.freedesktop.org/show_bug.cgi?id=59982">bug 59982</a> from <a class="email" href="mailto:agd5f@yahoo.com" title="Alex Deucher <agd5f@yahoo.com>"> Alex Deucher</a> <pre>UpdateCRTC_DoubleBufferRegisters takes the crtc hardware lock so that updates happen atomically rather than double buffered updates during the vupdate period. You pass parameters to the atom table via a struct, in this case, ENABLE_CRTC_PS_ALLOCATION. args.ucCRTC = radeon_crtc->crtc_id; args.ucEnable = lock; 0006: 370000 SET_ATI_PORT 0000 (INDIRECT_IO_MM) Select the mmio register aperture. 0009: 5214 CALL_TABLE 14 (ASIC_StaticPwrMgtStatusChange/SetUniphyInstance) SetUniphyInstance updates the offset for the selected crtc based on args.ucCRTC parameter. 000b: 0765b61bfe AND reg[1bb6] [..X.] <- fe This enables enables double buffering. 0010: 3d650001 COMP param[00] [..X.] <- 01 This checks the params to see is we are enabling the lock (args.ucEnable = ATOM_ENABLE) or disabling the lock (args.ucEnable = ATOM_DISABLE). 0014: 443b00 JUMP_Equal 003b If args.ucEnable == ATOM_ENABLE, jump to table offset 0x003b. Drop the lock (args.ucEnable = ATOM_DISABLE). 0017: 5430761a CLEAR reg[1a76] [.X..] 001b: 54306e1a CLEAR reg[1a6e] [.X..] 001f: 5430271a CLEAR reg[1a27] [.X..] 0023: 5430111a CLEAR reg[1a11] [.X..] 0027: 5420b51b CLEAR reg[1bb5] [...X] 002b: 5420bd1b CLEAR reg[1bbd] [...X] 002f: 4a25b61b01 TEST reg[1bb6] [...X] <- 01 This tests the CRTC_DOUBLE_BUFFER_CONTROL.CRTC_UPDATE_PENDING bit. 0034: 492f00 JUMP_NotEqual 002f If the bit is high, we jump back to 0x002f. If the bit is low, we're done. 0037: 3a0000 SET_REG_BLOCK 0000 003a: 5b EOT Take the lock (args.ucEnable = ATOM_ENABLE). 003b: 0d25bd1b01 OR reg[1bbd] [...X] <- 01 0040: 54009e1b CLEAR reg[1b9e] [XXXX] 0044: 3a0000 SET_REG_BLOCK 0000 0047: 5b EOT Just like in the other table, for some reason, the bit never goes low.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>