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Wed, 26 Aug 2026 07:48:55 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id 5zGeKGeajmoLCwAAD6G6ig (envelope-from ); Wed, 26 Aug 2026 07:48:55 +0000 Message-ID: <0c7199e9-9abc-4b39-8a5c-9c95f0dd0b04@suse.de> Date: Wed, 26 Aug 2026 09:48:55 +0200 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: drm/mgag200: Fix big-endian support To: Christian Zigotzky , rene@exactco.de Cc: linuxppc-dev , Trevor Dickinson , hypexed@yahoo.com.au, mad skateman , Christian Zigotzky References: <4ACA9FCA-683C-44D0-B31F-CE70C40070BB@xenosoft.de> Content-Language: en-US From: Thomas Zimmermann Autocrypt: addr=tzimmermann@suse.de; keydata= xsBNBFs50uABCADEHPidWt974CaxBVbrIBwqcq/WURinJ3+2WlIrKWspiP83vfZKaXhFYsdg XH47fDVbPPj+d6tQrw5lPQCyqjwrCPYnq3WlIBnGPJ4/jreTL6V+qfKRDlGLWFjZcsrPJGE0 BeB5BbqP5erN1qylK9i3gPoQjXGhpBpQYwRrEyQyjuvk+Ev0K1Jc5tVDeJAuau3TGNgah4Yc hdHm3bkPjz9EErV85RwvImQ1dptvx6s7xzwXTgGAsaYZsL8WCwDaTuqFa1d1jjlaxg6+tZsB 9GluwvIhSezPgnEmimZDkGnZRRSFiGP8yjqTjjWuf0bSj5rUnTGiyLyRZRNGcXmu6hjlABEB AAHNJ1Rob21hcyBaaW1tZXJtYW5uIDx0emltbWVybWFubkBzdXNlLmRlPsLAjgQTAQgAOAIb AwULCQgHAgYVCgkICwIEFgIDAQIeAQIXgBYhBHIX+6yM6c9jRKFo5WgNwR1TC3ojBQJftODH AAoJEGgNwR1TC3ojx1wH/0hKGWugiqDgLNXLRD/4TfHBEKmxIrmfu9Z5t7vwUKfwhFL6hqvo lXPJJKQpQ2z8+X2vZm/slsLn7J1yjrOsoJhKABDi+3QWWSGkaGwRJAdPVVyJMfJRNNNIKwVb U6B1BkX2XDKDGffF4TxlOpSQzdtNI/9gleOoUA8+jy8knnDYzjBNOZqLG2FuTdicBXblz0Mf vg41gd9kCwYXDnD91rJU8tzylXv03E75NCaTxTM+FBXPmsAVYQ4GYhhgFt8S2UWMoaaABLDe 7l5FdnLdDEcbmd8uLU2CaG4W2cLrUaI4jz2XbkcPQkqTQ3EB67hYkjiEE6Zy3ggOitiQGcqp j//OwE0EWznS4AEIAMYmP4M/V+T5RY5at/g7rUdNsLhWv1APYrh9RQefODYHrNRHUE9eosYb T6XMryR9hT8XlGOYRwKWwiQBoWSDiTMo/Xi29jUnn4BXfI2px2DTXwc22LKtLAgTRjP+qbU6 3Y0xnQN29UGDbYgyyK51DW3H0If2a3JNsheAAK+Xc9baj0LGIc8T9uiEWHBnCH+RdhgATnWW GKdDegUR5BkDfDg5O/FISymJBHx2Dyoklv5g4BzkgqTqwmaYzsl8UxZKvbaxq0zbehDda8lv hFXodNFMAgTLJlLuDYOGLK2AwbrS3Sp0AEbkpdJBb44qVlGm5bApZouHeJ/+n+7r12+lqdsA EQEAAcLAdgQYAQgAIAIbDBYhBHIX+6yM6c9jRKFo5WgNwR1TC3ojBQJftOH6AAoJEGgNwR1T C3ojVSkIALpAPkIJPQoURPb1VWjh34l0HlglmYHvZszJWTXYwavHR8+k6Baa6H7ufXNQtThR yIxJrQLW6rV5lm7TjhffEhxVCn37+cg0zZ3j7zIsSS0rx/aMwi6VhFJA5hfn3T0TtrijKP4A SAQO9xD1Zk9/61JWk8OysuIh7MXkl0fxbRKWE93XeQBhIJHQfnc+YBLprdnxR446Sh8Wn/2D Ya8cavuWf2zrB6cZurs048xe0UbSW5AOSo4V9M0jzYI4nZqTmPxYyXbm30Kvmz0rYVRaitYJ 4kyYYMhuULvrJDMjZRvaNe52tkKAvMevcGdt38H4KSVXAylqyQOW5zvPc4/sq9c= In-Reply-To: <4ACA9FCA-683C-44D0-B31F-CE70C40070BB@xenosoft.de> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-4.51 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; RCPT_COUNT_SEVEN(0.00)[7]; TO_DN_SOME(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCVD_TLS_ALL(0.00)[]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; MID_RHS_MATCH_FROM(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com,xtra.co.nz,yahoo.com.au]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; FREEMAIL_CC(0.00)[lists.ozlabs.org,xtra.co.nz,yahoo.com.au,gmail.com,xenosoft.de]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:url,bootlin.com:url,imap1.dmz-prg2.suse.org:rdns,imap1.dmz-prg2.suse.org:helo,suse.de:mid,suse.de:dkim]; DNSWL_BLOCKED(0.00)[2a07:de40:b281:104:10:150:64:97:from,2a07:de40:b281:106:10:150:64:167:received]; DKIM_TRACE(0.00)[suse.de:+] X-Rspamd-Queue-Id: D73F4872A4 X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Action: no action Hi Am 02.08.26 um 20:06 schrieb Christian Zigotzky: > Hello René, > > Many thanks for your patch. [1] > > I have bought the PCI graphics card Matrox G200 G2+/QUADP-PL/7 32MB with 4x DVI. It is an AGP card connected via PCI. > > We use the new DRM driver MGAG200 since the kernel 7.2.0-rc4 and the old DRM legacy driver for Matrox g200/g400 graphics cards since the stable long-term kernel 5.10.260. > > I tested it with the RC5 of kernel 7.2 in my PowerPC machine (e5500) today. Unfortunately, the DRM driver mgag200 can't read the PCI ROM. Maybe only an x86 ROM? This comment in the rsp fbdev driver might explain what's happening here: https://elixir.bootlin.com/linux/v7.2/source/drivers/video/fbdev/matrox/matroxfb_misc.c#L501 > > xrandr detects the ports but reports that they are not connected, even though the cables are plugged in. > > I also tested it with the stable long-term kernel 5.10.261 with the old legacy DRM drivers for Matrox graphics cards. > I installed the Xorg MGA server xf86-video-mga-2.0.0_3 for the old legacy DRM driver but unfortunately I get only a black screen. > > Is it possible to use this card with PPC Linux? Doing ROM-parsing as the same as old driver does could possibly resolve the issue.  If nothing else shows up, I'll take a look at it. Best regards Thomas > > More information: > > lspci -vvv > > 0001:05:00.0 VGA compatible controller: Matrox Electronics Systems Ltd. MGA G200 AGP (rev 03) (prog-if 00 [VGA controller]) > Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor > Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- > Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- SERR- Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes > Interrupt: pin A routed to IRQ 18 > Region 0: Memory at c20000000 (32-bit, prefetchable) [size=16M] > Region 1: Memory at c21000000 (32-bit, non-prefetchable) [size=16K] > Region 2: Memory at c21800000 (32-bit, non-prefetchable) [size=8M] > Expansion ROM at c21010000 [disabled] [size=64K] > Capabilities: [dc] Power Management version 1 > Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) > Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME- > Capabilities: [f0] AGP version 1.0 > Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2 > Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate= > Kernel driver in use: mgag200 > > 0001:05:04.0 Display controller: Matrox Electronics Systems Ltd. MGA G200 AGP (rev 03) > Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor > Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- > Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- SERR- Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes > Interrupt: pin A routed to IRQ 18 > Region 0: Memory at c22000000 (32-bit, prefetchable) [size=16M] > Region 1: Memory at c23000000 (32-bit, non-prefetchable) [size=16K] > Region 2: Memory at c23800000 (32-bit, non-prefetchable) [size=8M] > Expansion ROM at c21020000 [disabled] [size=64K] > Capabilities: [dc] Power Management version 1 > Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) > Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME- > Capabilities: [f0] AGP version 1.0 > Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2 > Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate= > Kernel driver in use: mgag200 > > 0001:05:08.0 Display controller: Matrox Electronics Systems Ltd. MGA G200 AGP (rev 03) > Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor > Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- > Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- SERR- Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes > Interrupt: pin A routed to IRQ 18 > Region 0: Memory at c24000000 (32-bit, prefetchable) [size=16M] > Region 1: Memory at c25000000 (32-bit, non-prefetchable) [size=16K] > Region 2: Memory at c25800000 (32-bit, non-prefetchable) [size=8M] > Expansion ROM at c21030000 [disabled] [size=64K] > Capabilities: [dc] Power Management version 1 > Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) > Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME- > Capabilities: [f0] AGP version 1.0 > Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2 > Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate= > Kernel driver in use: mgag200 > > 0001:05:0c.0 Display controller: Matrox Electronics Systems Ltd. MGA G200 AGP (rev 03) > Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor > Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- > Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- SERR- Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes > Interrupt: pin A routed to IRQ 18 > Region 0: Memory at c26000000 (32-bit, prefetchable) [size=16M] > Region 1: Memory at c27000000 (32-bit, non-prefetchable) [size=16K] > Region 2: Memory at c27800000 (32-bit, non-prefetchable) [size=8M] > Expansion ROM at c21040000 [disabled] [size=64K] > Capabilities: [dc] Power Management version 1 > Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) > Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME- > Capabilities: [f0] AGP version 1.0 > Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2 > Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate= > Kernel driver in use: mgag200 > > > dmesg | grep -i mga > > [ 2.302206] [drm] Initialized mgag200 1.0.0 for 0001:05:00.0 on minor 1 > [ 2.303761] mgag200 0001:05:00.0: [drm] Cannot find any crtc or sizes > [ 2.304697] mgag200 0001:05:04.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0xffff > [ 2.305792] [drm] Initialized mgag200 1.0.0 for 0001:05:04.0 on minor 2 > [ 2.308281] mgag200 0001:05:04.0: [drm] Cannot find any crtc or sizes > [ 2.308802] mgag200 0001:05:08.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0xffff > [ 2.309319] [drm] Initialized mgag200 1.0.0 for 0001:05:08.0 on minor 3 > [ 2.309785] mgag200 0001:05:00.0: [drm] Cannot find any crtc or sizes > [ 2.310900] mgag200 0001:05:08.0: [drm] Cannot find any crtc or sizes > [ 2.311895] mgag200 0001:05:0c.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0xffff > [ 2.312633] [drm] Initialized mgag200 1.0.0 for 0001:05:0c.0 on minor 4 > [ 2.312844] mgag200 0001:05:04.0: [drm] Cannot find any crtc or sizes > [ 2.315512] mgag200 0001:05:0c.0: [drm] Cannot find any crtc or sizes > [ 2.317178] mgag200 0001:05:08.0: [drm] Cannot find any crtc or sizes > [ 2.323318] mgag200 0001:05:0c.0: [drm] Cannot find any crtc or sizes > > xrandr > > … > > VGA-4-4 disconnected (normal left inverted right x axis y axis) > VGA-3-3 disconnected (normal left inverted right x axis y axis) > VGA-2-2 disconnected (normal left inverted right x axis y axis) > VGA-1-1 disconnected (normal left inverted right x axis y axis) > > … > > lspci -nnk | grep VGA > > 0001:05:00.0 VGA compatible controller [0300]: Matrox Electronics Systems Ltd. MGA G200 AGP [102b:0521] (rev 03) > > Thanks, > Christian > > [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/gpu/drm/mgag200/mgag200_mode.c?id=6cb31fba137d45e682ce455b8ea364f44d5d4f98 -- -- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com GF: Jochen Jaser, Andrew McDonald, (HRB 36809, AG Nürnberg)