[PATCH 8/8] drm/mgag200: Add support for G200 desktop cards
Sam Ravnborg
sam at ravnborg.org
Mon Jul 20 20:16:58 UTC 2020
On Mon, Jul 20, 2020 at 03:18:56PM -0400, Lyude Paul wrote:
> On Mon, 2020-07-20 at 09:04 +0200, Thomas Zimmermann wrote:
> > Hi
> >
> > Am 17.07.20 um 00:43 schrieb Lyude Paul:
> > > On Wed, 2020-07-15 at 16:59 +0200, Thomas Zimmermann wrote:
> > > > This patch adds support for G200 desktop cards. We can reuse the whole
> > > > memory and modesetting code. A few PCI and DAC register values have to
> > > > be updated accordingly.
> > > >
> > > > The most significant change is in the PLL setup. The get the clock
> > > > limits
> > > > and reference clocks, parses the device's BIOS. With no BIOS found, safe
> > > > defaults are being used.
> > > >
> > > > Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
> > > > Co-developed-by: Egbert Eich <eich at suse.com>
> > > > Signed-off-by: Egbert Eich <eich at suse.com>
> > > > Co-developed-by: Takashi Iwai <tiwai at suse.de>
> > > > Signed-off-by: Takashi Iwai <tiwai at suse.de>
> > > > ---
> > > > MAINTAINERS | 2 +-
> > > > drivers/gpu/drm/mgag200/Kconfig | 12 +--
> > > > drivers/gpu/drm/mgag200/mgag200_drv.c | 125 ++++++++++++++++++++++++-
> > > > drivers/gpu/drm/mgag200/mgag200_drv.h | 10 ++
> > > > drivers/gpu/drm/mgag200/mgag200_mode.c | 80 ++++++++++++++++
> > > > 5 files changed, 220 insertions(+), 9 deletions(-)
> > > >
> > > > diff --git a/MAINTAINERS b/MAINTAINERS
> > > > index 415954a98934..4c6f96e2b79b 100644
> > > > --- a/MAINTAINERS
> > > > +++ b/MAINTAINERS
> > > > @@ -5406,7 +5406,7 @@ S: Orphan / Obsolete
> > > > F: drivers/gpu/drm/mga/
> > > > F: include/uapi/drm/mga_drm.h
> > > >
> > > > -DRM DRIVER FOR MGA G200 SERVER GRAPHICS CHIPS
> > > > +DRM DRIVER FOR MGA G200 GRAPHICS CHIPS
> > > > M: Dave Airlie <airlied at redhat.com>
> > > > S: Odd Fixes
> > > > F: drivers/gpu/drm/mgag200/
> > > > diff --git a/drivers/gpu/drm/mgag200/Kconfig
> > > > b/drivers/gpu/drm/mgag200/Kconfig
> > > > index 93be766715c9..eec59658a938 100644
> > > > --- a/drivers/gpu/drm/mgag200/Kconfig
> > > > +++ b/drivers/gpu/drm/mgag200/Kconfig
> > > > @@ -1,13 +1,11 @@
> > > > # SPDX-License-Identifier: GPL-2.0-only
> > > > config DRM_MGAG200
> > > > - tristate "Kernel modesetting driver for MGA G200 server engines"
> > > > + tristate "Matrox G200"
> > > > depends on DRM && PCI && MMU
> > > > select DRM_GEM_SHMEM_HELPER
> > > > select DRM_KMS_HELPER
> > > > help
> > > > - This is a KMS driver for the MGA G200 server chips, it
> > > > - does not support the original MGA G200 or any of the desktop
> > > > - chips. It requires 0.3.0 of the modesetting userspace driver,
> > > > - and a version of mga driver that will fail on KMS enabled
> > > > - devices.
> > > > -
> > > > + This is a KMS driver for Matrox G200 chips. It supports the original
> > > > + MGA G200 desktop chips and the server variants. It requires 0.3.0
> > > > + of the modesetting userspace driver, and a version of mga driver
> > > > + that will fail on KMS enabled devices.
> > > > diff --git a/drivers/gpu/drm/mgag200/mgag200_drv.c
> > > > b/drivers/gpu/drm/mgag200/mgag200_drv.c
> > > > index f7652e16365c..419817d6e2cd 100644
> > > > --- a/drivers/gpu/drm/mgag200/mgag200_drv.c
> > > > +++ b/drivers/gpu/drm/mgag200/mgag200_drv.c
> > > > @@ -64,6 +64,14 @@ static int mgag200_regs_init(struct mga_device *mdev)
> > > > u8 crtcext3;
> > > >
> > > > switch (mdev->type) {
> > > > + case G200_PCI:
> > > > + case G200_AGP:
> > > > + if (mgag200_has_sgram(mdev))
> > > > + option = 0x4049cd21;
> > > > + else
> > > > + option = 0x40499121;
> > > > + option2 = 0x00008000;
> > > > + break;
> > > > case G200_SE_A:
> > > > case G200_SE_B:
> > > > if (mgag200_has_sgram(mdev))
> > > > @@ -115,6 +123,117 @@ static int mgag200_regs_init(struct mga_device
> > > > *mdev)
> > > > return 0;
> > > > }
> > > >
> > > > +static void mgag200_g200_interpret_bios(struct mga_device *mdev,
> > > > + unsigned char __iomem *bios,
> > > > + size_t size)
> > > > +{
> > > > + static const unsigned int expected_length[6] = {
> > > > + 0, 64, 64, 64, 128, 128
> > > > + };
> > > > +
> > > > + struct drm_device *dev = &mdev->base;
> > > > + unsigned char __iomem *pins;
> > >
> > > huh, never realized you could write directly to unsigned char __iomem
> > > pointers!
> >
> > I took the patch as-is, but this probably wouldn't work on all
> > architectures.
>
> Something occurred to me just now - do we actually care? I don't think I've
> ever seen mgag200 on anything other then x86_64 systems
For starters to silence the sparse warnings.
Also other parts of the driver uses the io{read,write} functions
so to be consistent this code shoudl also do it.
And to avoid having bad code floating around.
It is not as it is a big deal to fix it neither does it hurt
performance.
But then it is up to Thomas in the end.
Sam
>
> >
> > > > + unsigned int pins_len, version;
> > > > + int offset;
> > > > + int tmp;
> > > > +
> > > > + if (size < MGA_BIOS_OFFSET + 1)
> > > > + return;
> > > > +
> > > > + if (bios[45] != 'M' || bios[46] != 'A' || bios[47] != 'T' ||
> > > > + bios[48] != 'R' || bios[49] != 'O' || bios[50] != 'X')
> > > > + return;
> > > > +
> > > > + offset = (bios[MGA_BIOS_OFFSET + 1] << 8) | bios[MGA_BIOS_OFFSET];
> > > > +
> > > > + if (offset + 5 > size)
> > > > + return;
> > > > +
> > > > + pins = bios + offset;
> > > > + if (pins[0] == 0x2e && pins[1] == 0x41) {
> > > > + version = pins[5];
> > > > + pins_len = pins[2];
> > > > + } else {
> > > > + version = 1;
> > > > + pins_len = pins[0] + (pins[1] << 8);
> > > > + }
> > > > +
> > > > + if (version < 1 || version > 5) {
> > > > + drm_warn(dev, "Unknown BIOS PInS version: %d\n", version);
> > >
> > > Did you maybe mean pins or PINS here? or is PInS some weird abbreviation
> > > matrox
> > > uses?
> >
> > It's the name of a data structure
> >
> >
> > https://gitlab.freedesktop.org/xorg/driver/xf86-video-mga/-/blob/master/mga_PInS.txt
> >
> > I have no idea what it stands for.
> >
> > > > + return;
> > > > + }
> > > > + if (pins_len != expected_length[version]) {
> > > > + drm_warn(dev, "Unexpected BIOS PInS size: %d expeced: %d\n",
> > > > + pins_len, expected_length[version]);
> > > > + return;
> > > > + }
> > > > +
> > > > + if (offset + pins_len > size)
> > > > + return;
> > > > +
> > > > + drm_dbg_kms(dev, "MATROX BIOS PInS version %d size: %d found\n",
> > > > + version, pins_len);
> > > > +
> > > > + switch (version) {
> > > > + case 1:
> > > > + tmp = pins[24] + (pins[25] << 8);
> > > > + if (tmp)
> > > > + mdev->model.g200.pclk_max = tmp * 10;
> > > > + break;
> > > > + case 2:
> > > > + if (pins[41] != 0xff)
> > > > + mdev->model.g200.pclk_max = (pins[41] + 100) * 1000;
> > > > + break;
> > > > + case 3:
> > > > + if (pins[36] != 0xff)
> > > > + mdev->model.g200.pclk_max = (pins[36] + 100) * 1000;
> > > > + if (pins[52] & 0x20)
> > > > + mdev->model.g200.ref_clk = 14318;
> > > > + break;
> > > > + case 4:
> > > > + if (pins[39] != 0xff)
> > > > + mdev->model.g200.pclk_max = pins[39] * 4 * 1000;
> > > > + if (pins[92] & 0x01)
> > > > + mdev->model.g200.ref_clk = 14318;
> > > > + break;
> > > > + case 5:
> > > > + tmp = pins[4] ? 8000 : 6000;
> > > > + if (pins[123] != 0xff)
> > > > + mdev->model.g200.pclk_min = pins[123] * tmp;
> > > > + if (pins[38] != 0xff)
> > > > + mdev->model.g200.pclk_max = pins[38] * tmp;
> > > > + if (pins[110] & 0x01)
> > > > + mdev->model.g200.ref_clk = 14318;
> > > > + break;
> > > > + default:
> > > > + break;
> > > > + }
> > > > +}
> > > > +
> > > > +static void mgag200_g200_init_refclk(struct mga_device *mdev)
> > > > +{
> > > > + struct drm_device *dev = &mdev->base;
> > > > + unsigned char __iomem *bios;
> > > > + size_t size;
> > > > +
> > > > + mdev->model.g200.pclk_min = 50000;
> > > > + mdev->model.g200.pclk_max = 230000;
> > > > + mdev->model.g200.ref_clk = 27050;
> > > > +
> > > > + bios = pci_map_rom(dev->pdev, &size);
> > > > + if (!bios)
> > > > + return;
> > > > +
> > > > + if (size != 0 && bios[0] == 0x55 && bios[1] == 0xaa)
> > > > + mgag200_g200_interpret_bios(mdev, bios, size);
> > > > +
> > > > + pci_unmap_rom(dev->pdev, bios);
> > > > +
> > > > + drm_dbg_kms(dev, "pclk_min: %ld pclk_max: %ld ref_clk: %ld\n",
> > > > + mdev->model.g200.pclk_min, mdev->model.g200.pclk_max,
> > > > + mdev->model.g200.ref_clk);
> > > > +}
> > > > +
> > > > static void mgag200_g200se_init_unique_id(struct mga_device *mdev)
> > > > {
> > > > struct drm_device *dev = &mdev->base;
> > > > @@ -138,7 +257,9 @@ static int mgag200_device_init(struct mga_device
> > > > *mdev,
> > > > unsigned long flags)
> > > > if (ret)
> > > > return ret;
> > > >
> > > > - if (IS_G200_SE(mdev))
> > > > + if (mdev->type == G200_PCI || mdev->type == G200_AGP)
> > > > + mgag200_g200_init_refclk(mdev);
> > > > + else if (IS_G200_SE(mdev))
> > > > mgag200_g200se_init_unique_id(mdev);
> > > >
> > > > ret = mgag200_mm_init(mdev);
> > > > @@ -182,6 +303,8 @@ mgag200_device_create(struct pci_dev *pdev, unsigned
> > > > long
> > > > flags)
> > > > */
> > > >
> > > > static const struct pci_device_id mgag200_pciidlist[] = {
> > > > + { PCI_VENDOR_ID_MATROX, 0x520, PCI_ANY_ID, PCI_ANY_ID, 0, 0, G200_PCI
> > > > },
> > > > + { PCI_VENDOR_ID_MATROX, 0x521, PCI_ANY_ID, PCI_ANY_ID, 0, 0, G200_AGP
> > > > },
> > > > { PCI_VENDOR_ID_MATROX, 0x522, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
> > > > G200_SE_A | MGAG200_FLAG_HW_BUG_NO_STARTADD},
> > > > { PCI_VENDOR_ID_MATROX, 0x524, PCI_ANY_ID, PCI_ANY_ID, 0, 0, G200_SE_B
> > > > },
> > > > diff --git a/drivers/gpu/drm/mgag200/mgag200_drv.h
> > > > b/drivers/gpu/drm/mgag200/mgag200_drv.h
> > > > index 048efe635aff..54061a61e9ca 100644
> > > > --- a/drivers/gpu/drm/mgag200/mgag200_drv.h
> > > > +++ b/drivers/gpu/drm/mgag200/mgag200_drv.h
> > > > @@ -38,6 +38,8 @@
> > > > #define RREG32(reg) ioread32(((void __iomem *)mdev->rmmio) + (reg))
> > > > #define WREG32(reg, v) iowrite32(v, ((void __iomem *)mdev->rmmio) +
> > > > (reg))
> > > >
> > > > +#define MGA_BIOS_OFFSET 0x7ffc
> > > > +
> > > > #define ATTR_INDEX 0x1fc0
> > > > #define ATTR_DATA 0x1fc1
> > > >
> > > > @@ -129,6 +131,8 @@ struct mga_mc {
> > > > };
> > > >
> > > > enum mga_type {
> > > > + G200_PCI,
> > > > + G200_AGP,
> > > > G200_SE_A,
> > > > G200_SE_B,
> > > > G200_WB,
> > > > @@ -167,12 +171,18 @@ struct mga_device {
> > > > int fb_mtrr;
> > > >
> > > > union {
> > > > + struct {
> > > > + long ref_clk;
> > > > + long pclk_min;
> > > > + long pclk_max;
> > > > + } g200;
> > > > struct {
> > > > /* SE model number stored in reg 0x1e24 */
> > > > u32 unique_rev_id;
> > > > } g200se;
> > > > } model;
> > > >
> > > > +
> > > > struct mga_connector connector;
> > > > struct drm_simple_display_pipe display_pipe;
> > > > };
> > > > diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c
> > > > b/drivers/gpu/drm/mgag200/mgag200_mode.c
> > > > index 752409c7f326..bc11552415f5 100644
> > > > --- a/drivers/gpu/drm/mgag200/mgag200_mode.c
> > > > +++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
> > > > @@ -108,6 +108,77 @@ static inline void mga_wait_busy(struct mga_device
> > > > *mdev)
> > > > } while ((status & 0x01) && time_before(jiffies, timeout));
> > > > }
> > > >
> > > > +/*
> > > > + * PLL setup
> > > > + */
> > > > +
> > > > +static int mgag200_g200_set_plls(struct mga_device *mdev, long clock)
> > > > +{
> > > > + struct drm_device *dev = &mdev->base;
> > > > + const int post_div_max = 7;
> > > > + const int in_div_min = 1;
> > > > + const int in_div_max = 6;
> > > > + const int feed_div_min = 7;
> > > > + const int feed_div_max = 127;
> > > > + u8 testm, testn;
> > > > + u8 n = 0, m = 0, p, s;
> > > > + long f_vco;
> > > > + long computed;
> > > > + long delta, tmp_delta;
> > > > + long ref_clk = mdev->model.g200.ref_clk;
> > > > + long p_clk_min = mdev->model.g200.pclk_min;
> > > > + long p_clk_max = mdev->model.g200.pclk_max;
> > > > +
> > > > + if (clock > p_clk_max) {
> > > > + drm_err(dev, "Pixel Clock %ld too high\n", clock);
> > > > + return 1;
> > > > + }
> > > > +
> > > > + if (clock < p_clk_min >> 3)
> > >
> > > Looks like there's a stray space after the <. You could also just use
> > > max()
> > > here, but I'll leave that up to you
> > >
> > > > + clock = p_clk_min >> 3;
> > > > +
> > > > + f_vco = clock;
> > > > + for (p = 0;
> > > > + p <= post_div_max && f_vco < p_clk_min;
> > > > + p = (p << 1) + 1, f_vco <<= 1)
> > > > + ;
> > > > +
> > > > + delta = clock;
> > > > +
> > > > + for (testm = in_div_min; testm <= in_div_max; testm++) {
> > > > + for (testn = feed_div_min; testn <= feed_div_max; testn++) {
> > > > + computed = ref_clk * (testn + 1) / (testm + 1);
> > > > + if (computed < f_vco)
> > > > + tmp_delta = f_vco - computed;
> > > > + else
> > > > + tmp_delta = computed - f_vco;
> > >
> > > Another stray space before the =
> > >
> > > With those nitpicks addressed, this series is:
> > >
> > > Reviewed-by: Lyude Paul <lyude at redhat.com>
> >
> > Thanks a lot.
> >
> > The other patches are probably uncontoversial. Let's see what happens to
> > this one. :)
> >
> > Best regards
> > Thomas
> >
> > > > + if (tmp_delta < delta) {
> > > > + delta = tmp_delta;
> > > > + m = testm;
> > > > + n = testn;
> > > > + }
> > > > + }
> > > > + }
> > > > + f_vco = ref_clk * (n + 1) / (m + 1);
> > > > + if (f_vco < 100000)
> > > > + s = 0;
> > > > + else if (f_vco < 140000)
> > > > + s = 1;
> > > > + else if (f_vco < 180000)
> > > > + s = 2;
> > > > + else
> > > > + s = 3;
> > > > +
> > > > + drm_dbg_kms(dev, "clock: %ld vco: %ld m: %d n: %d p: %d s: %d\n",
> > > > + clock, f_vco, m, n, p, s);
> > > > +
> > > > + WREG_DAC(MGA1064_PIX_PLLC_M, m);
> > > > + WREG_DAC(MGA1064_PIX_PLLC_N, n);
> > > > + WREG_DAC(MGA1064_PIX_PLLC_P, (p | (s << 3)));
> > > > +
> > > > + return 0;
> > > > +}
> > > > +
> > > > #define P_ARRAY_SIZE 9
> > > >
> > > > static int mga_g200se_set_plls(struct mga_device *mdev, long clock)
> > > > @@ -717,6 +788,9 @@ static int mgag200_crtc_set_plls(struct mga_device
> > > > *mdev,
> > > > long clock)
> > > > u8 misc;
> > > >
> > > > switch(mdev->type) {
> > > > + case G200_PCI:
> > > > + case G200_AGP:
> > > > + return mgag200_g200_set_plls(mdev, clock);
> > > > case G200_SE_A:
> > > > case G200_SE_B:
> > > > return mga_g200se_set_plls(mdev, clock);
> > > > @@ -894,6 +968,12 @@ static void mgag200_set_dac_regs(struct mga_device
> > > > *mdev)
> > > > };
> > > >
> > > > switch (mdev->type) {
> > > > + case G200_PCI:
> > > > + case G200_AGP:
> > > > + dacvalue[MGA1064_SYS_PLL_M] = 0x04;
> > > > + dacvalue[MGA1064_SYS_PLL_N] = 0x2D;
> > > > + dacvalue[MGA1064_SYS_PLL_P] = 0x19;
> > > > + break;
> > > > case G200_SE_A:
> > > > case G200_SE_B:
> > > > dacvalue[MGA1064_VREF_CTL] = 0x03;
> --
> Cheers,
> Lyude Paul (she/her)
> Associate Software Engineer at Red Hat
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