Re: [PATCH v2 1/3] drm/mgag200: Only set VIDRST bits in CRTC modesetting

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On 10/07/2024 10:42, Thomas Zimmermann wrote:
The VRSTEN and HRSTEN bits control whether a CRTC synchronizes its
display signal with an external source on the VIDRST pin. The G200WB
and G200EW3 models synchronize with a BMC chip, but different external
video encoders, such as the Matrox Maven, can also be attached to the
pin.

Only set VRSTEN and HRSTEN bits in the CRTC mode-setting code, so the
bits are independent from the BMC. Add the field set_vidrst to the CRTC
state for this purpose. Off by default, control the CRTC VIDRST setting
from the CRTC's atomic_check helper.

Thanks, I think this has less chance for regression.

I've only a small nitpick below.

Reviewed-by: Jocelyn Falempe <jfalempe@xxxxxxxxxx>

v2:
- keep logic entirely in CRTC (Jocelyn)

Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
  drivers/gpu/drm/mgag200/mgag200_bmc.c    |  5 -----
  drivers/gpu/drm/mgag200/mgag200_drv.h    |  5 ++++-
  drivers/gpu/drm/mgag200/mgag200_g200er.c |  2 +-
  drivers/gpu/drm/mgag200/mgag200_g200ev.c |  2 +-
  drivers/gpu/drm/mgag200/mgag200_g200se.c |  2 +-
  drivers/gpu/drm/mgag200/mgag200_mode.c   | 14 ++++++++++----
  6 files changed, 17 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/mgag200/mgag200_bmc.c b/drivers/gpu/drm/mgag200/mgag200_bmc.c
index 23ef85aa7e37..1c7aa4f36787 100644
--- a/drivers/gpu/drm/mgag200/mgag200_bmc.c
+++ b/drivers/gpu/drm/mgag200/mgag200_bmc.c
@@ -77,11 +77,6 @@ void mgag200_bmc_enable_vidrst(struct mga_device *mdev)
  {
  	u8 tmp;
- /* Ensure that the vrsten and hrsten are set */
-	WREG8(MGAREG_CRTCEXT_INDEX, 1);
-	tmp = RREG8(MGAREG_CRTCEXT_DATA);
-	WREG8(MGAREG_CRTCEXT_DATA, tmp | 0x88);
-
  	/* Assert rstlvl2 */
  	WREG8(DAC_INDEX, MGA1064_REMHEADCTL2);
  	tmp = RREG8(DAC_DATA);
diff --git a/drivers/gpu/drm/mgag200/mgag200_drv.h b/drivers/gpu/drm/mgag200/mgag200_drv.h
index 7f7dfbd0f013..4b75613de882 100644
--- a/drivers/gpu/drm/mgag200/mgag200_drv.h
+++ b/drivers/gpu/drm/mgag200/mgag200_drv.h
@@ -179,6 +179,8 @@ struct mgag200_crtc_state {
  	const struct drm_format_info *format;
struct mgag200_pll_values pixpllc;
+
+	bool set_vidrst;
  };
static inline struct mgag200_crtc_state *to_mgag200_crtc_state(struct drm_crtc_state *base)
@@ -430,7 +432,8 @@ void mgag200_crtc_atomic_destroy_state(struct drm_crtc *crtc, struct drm_crtc_st
  	.atomic_duplicate_state = mgag200_crtc_atomic_duplicate_state, \
  	.atomic_destroy_state = mgag200_crtc_atomic_destroy_state
-void mgag200_set_mode_regs(struct mga_device *mdev, const struct drm_display_mode *mode);
+void mgag200_set_mode_regs(struct mga_device *mdev, const struct drm_display_mode *mode,
+			   bool set_vidrst);
  void mgag200_set_format_regs(struct mga_device *mdev, const struct drm_format_info *format);
  void mgag200_enable_display(struct mga_device *mdev);
  void mgag200_init_registers(struct mga_device *mdev);
diff --git a/drivers/gpu/drm/mgag200/mgag200_g200er.c b/drivers/gpu/drm/mgag200/mgag200_g200er.c
index 4e8a1756138d..abfbed6ec390 100644
--- a/drivers/gpu/drm/mgag200/mgag200_g200er.c
+++ b/drivers/gpu/drm/mgag200/mgag200_g200er.c
@@ -195,7 +195,7 @@ static void mgag200_g200er_crtc_helper_atomic_enable(struct drm_crtc *crtc,
  		funcs->disable_vidrst(mdev);
mgag200_set_format_regs(mdev, format);
-	mgag200_set_mode_regs(mdev, adjusted_mode);
+	mgag200_set_mode_regs(mdev, adjusted_mode, mgag200_crtc_state->set_vidrst);
if (funcs->pixpllc_atomic_update)
  		funcs->pixpllc_atomic_update(crtc, old_state);
diff --git a/drivers/gpu/drm/mgag200/mgag200_g200ev.c b/drivers/gpu/drm/mgag200/mgag200_g200ev.c
index d884f3cb0ec7..acc99999e2b5 100644
--- a/drivers/gpu/drm/mgag200/mgag200_g200ev.c
+++ b/drivers/gpu/drm/mgag200/mgag200_g200ev.c
@@ -196,7 +196,7 @@ static void mgag200_g200ev_crtc_helper_atomic_enable(struct drm_crtc *crtc,
  		funcs->disable_vidrst(mdev);
mgag200_set_format_regs(mdev, format);
-	mgag200_set_mode_regs(mdev, adjusted_mode);
+	mgag200_set_mode_regs(mdev, adjusted_mode, mgag200_crtc_state->set_vidrst);
if (funcs->pixpllc_atomic_update)
  		funcs->pixpllc_atomic_update(crtc, old_state);
diff --git a/drivers/gpu/drm/mgag200/mgag200_g200se.c b/drivers/gpu/drm/mgag200/mgag200_g200se.c
index a824bb8ad579..be4e124102c6 100644
--- a/drivers/gpu/drm/mgag200/mgag200_g200se.c
+++ b/drivers/gpu/drm/mgag200/mgag200_g200se.c
@@ -327,7 +327,7 @@ static void mgag200_g200se_crtc_helper_atomic_enable(struct drm_crtc *crtc,
  		funcs->disable_vidrst(mdev);
mgag200_set_format_regs(mdev, format);
-	mgag200_set_mode_regs(mdev, adjusted_mode);
+	mgag200_set_mode_regs(mdev, adjusted_mode, mgag200_crtc_state->set_vidrst);
if (funcs->pixpllc_atomic_update)
  		funcs->pixpllc_atomic_update(crtc, old_state);
diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c
index d4550e4b3b01..e746f365fecf 100644
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -201,9 +201,9 @@ void mgag200_init_registers(struct mga_device *mdev)
  	WREG8(MGA_MISC_OUT, misc);
  }
-void mgag200_set_mode_regs(struct mga_device *mdev, const struct drm_display_mode *mode)
+void mgag200_set_mode_regs(struct mga_device *mdev, const struct drm_display_mode *mode,
+			   bool set_vidrst)
  {
-	const struct mgag200_device_info *info = mdev->info;
  	unsigned int hdisplay, hsyncstart, hsyncend, htotal;
  	unsigned int vdisplay, vsyncstart, vsyncend, vtotal;
  	u8 misc, crtcext1, crtcext2, crtcext5;
@@ -238,9 +238,11 @@ void mgag200_set_mode_regs(struct mga_device *mdev, const struct drm_display_mod
  		   ((hdisplay & 0x100) >> 7) |
  		   ((hsyncstart & 0x100) >> 6) |
  		    (htotal & 0x40);
-	if (info->has_vidrst)
+	if (set_vidrst)
  		crtcext1 |= MGAREG_CRTCEXT1_VRSTEN |
  			    MGAREG_CRTCEXT1_HRSTEN;
+	else
+		crtcext1 &= ~(MGAREG_CRTCEXT1_VRSTEN | MGAREG_CRTCEXT1_HRSTEN);

The else case is useless, as crtcext1 has already this bits set to 0 unconditionnaly.

crtcext2 = ((vtotal & 0xc00) >> 10) |
  		   ((vdisplay & 0x400) >> 8) |
@@ -597,6 +599,7 @@ int mgag200_crtc_helper_atomic_check(struct drm_crtc *crtc, struct drm_atomic_st
  	struct mga_device *mdev = to_mga_device(dev);
  	const struct mgag200_device_funcs *funcs = mdev->funcs;
  	struct drm_crtc_state *new_crtc_state = drm_atomic_get_new_crtc_state(new_state, crtc);
+	struct mgag200_crtc_state *new_mgag200_crtc_state = to_mgag200_crtc_state(new_crtc_state);
  	struct drm_property_blob *new_gamma_lut = new_crtc_state->gamma_lut;
  	int ret;
@@ -607,6 +610,8 @@ int mgag200_crtc_helper_atomic_check(struct drm_crtc *crtc, struct drm_atomic_st
  	if (ret)
  		return ret;
+ new_mgag200_crtc_state->set_vidrst = mdev->info->has_vidrst;
+
  	if (new_crtc_state->mode_changed) {
  		if (funcs->pixpllc_atomic_check) {
  			ret = funcs->pixpllc_atomic_check(crtc, new_state);
@@ -656,7 +661,7 @@ void mgag200_crtc_helper_atomic_enable(struct drm_crtc *crtc, struct drm_atomic_
  		funcs->disable_vidrst(mdev);
mgag200_set_format_regs(mdev, format);
-	mgag200_set_mode_regs(mdev, adjusted_mode);
+	mgag200_set_mode_regs(mdev, adjusted_mode, mgag200_crtc_state->set_vidrst);
if (funcs->pixpllc_atomic_update)
  		funcs->pixpllc_atomic_update(crtc, old_state);
@@ -717,6 +722,7 @@ struct drm_crtc_state *mgag200_crtc_atomic_duplicate_state(struct drm_crtc *crtc
  	new_mgag200_crtc_state->format = mgag200_crtc_state->format;
  	memcpy(&new_mgag200_crtc_state->pixpllc, &mgag200_crtc_state->pixpllc,
  	       sizeof(new_mgag200_crtc_state->pixpllc));
+	new_mgag200_crtc_state->set_vidrst = mgag200_crtc_state->set_vidrst;
return &new_mgag200_crtc_state->base;
  }




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