[PATCH 8/8] drm/mgag200: Add support for G200 desktop cards

Sam Ravnborg sam at ravnborg.org
Fri Jul 17 05:45:03 UTC 2020


Hi Lyude.

On Thu, Jul 16, 2020 at 06:43:40PM -0400, Lyude Paul wrote:
> 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!
You cannot :-)

It works for some architectures but not for all.
On sparc64, for instance, this will fail.
The right thing is to use the accessors in io.h

sparse will help you finding such illegal uses of __iomem *.
The good thing is that the pointers are annotated __iomem here.

Thomas:
Please run sparse and fix the warnings using the right accessors
for this patch.

	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?
> 
> > +		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>
> 
> > +			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;


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