[PATCH 6/7] nouveau/dispnv50: program pixel clocks above 2.147GHz on GB20x

The HEAD_SET_PIXEL_CLOCK_FREQUENCY(_MAX) methods carry only 31 HERTZ
bits. Starting with C97D the upper bits live in separate
HEAD_SET_PIXEL_CLOCK_FREQUENCY_HI(_MAX) methods, which nouveau never
programmed and headca7d_mode() computed m->clock * 1000 into the 31-bit
field. NVVAL's mask then silently truncates anything past 2^31 Hz, which
means that every mode scanned out at pclk modulo 2^31.

No mode nouveau can currently commit crosses the boundary (an
uncompressed HDMI FRL mode tops out around 1.78GHz at 8bpc), but this is
a prerequisite for the upcoming DSC work, which makes 2.147GHz+ modes
reachable.

Program the full value split across the low and HI methods, exactly
as OpenRM's EvoSetRasterParams9() does (nvkms-evo4.c, 31-bit low word
plus the 4 HI HERTZ bits, giving 35 bits of range).

Signed-off-by: Mohamed Ahmed <[email protected]>
---
 drivers/gpu/drm/nouveau/dispnv50/headca7d.c   | 21 ++++++++++++++++---
 .../drm/nouveau/include/nvhw/class/clca7d.h   |  4 ++++
 2 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/dispnv50/headca7d.c b/drivers/gpu/drm/nouveau/dispnv50/headca7d.c
index eeaeb15aa664..2046e38a4d79 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/headca7d.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/headca7d.c
@@ -219,10 +219,11 @@ headca7d_mode(struct nv50_head *head, struct nv50_head_atom *asyh)
 {
 	struct nvif_push *push = &head->disp->core->chan.push;
 	struct nv50_head_mode *m = &asyh->mode;
+	const u64 hz = (u64)m->clock * 1000;
 	const int i = head->base.index;
 	int ret;
 
-	ret = PUSH_WAIT(push, 11);
+	ret = PUSH_WAIT(push, 15);
 	if (ret)
 		return ret;
 
@@ -245,11 +246,25 @@ headca7d_mode(struct nv50_head *head, struct nv50_head_atom *asyh)
 	PUSH_MTHD(push, NVCA7D, HEAD_SET_CONTROL(i),
 		  NVDEF(NVCA7D, HEAD_SET_CONTROL, STRUCTURE, PROGRESSIVE));
 
+	/* The FREQUENCY methods carry only 31 HERTZ bits; the upper bits
+	 * of anything past 2.147GHz live in the HI methods
+	 * (EvoSetRasterParams9()). Truncation here scans out at pclk modulo 2^31.
+	 */
 	PUSH_MTHD(push, NVCA7D, HEAD_SET_PIXEL_CLOCK_FREQUENCY(i),
-		  NVVAL(NVCA7D, HEAD_SET_PIXEL_CLOCK_FREQUENCY, HERTZ, m->clock * 1000));
+		  NVVAL(NVCA7D, HEAD_SET_PIXEL_CLOCK_FREQUENCY, HERTZ,
+			(u32)(hz & 0x7fffffff)));
 
 	PUSH_MTHD(push, NVCA7D, HEAD_SET_PIXEL_CLOCK_FREQUENCY_MAX(i),
-		  NVVAL(NVCA7D, HEAD_SET_PIXEL_CLOCK_FREQUENCY_MAX, HERTZ, m->clock * 1000));
+		  NVVAL(NVCA7D, HEAD_SET_PIXEL_CLOCK_FREQUENCY_MAX, HERTZ,
+			(u32)(hz & 0x7fffffff)));
+
+	PUSH_MTHD(push, NVCA7D, HEAD_SET_PIXEL_CLOCK_FREQUENCY_HI(i),
+		  NVVAL(NVCA7D, HEAD_SET_PIXEL_CLOCK_FREQUENCY_HI, HERTZ,
+			(u32)(hz >> 31)));
+
+	PUSH_MTHD(push, NVCA7D, HEAD_SET_PIXEL_CLOCK_FREQUENCY_HI_MAX(i),
+		  NVVAL(NVCA7D, HEAD_SET_PIXEL_CLOCK_FREQUENCY_HI_MAX, HERTZ,
+			(u32)(hz >> 31)));
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/nouveau/include/nvhw/class/clca7d.h b/drivers/gpu/drm/nouveau/include/nvhw/class/clca7d.h
index 0fec6fc21d44..1ab12d91c9d9 100644
--- a/drivers/gpu/drm/nouveau/include/nvhw/class/clca7d.h
+++ b/drivers/gpu/drm/nouveau/include/nvhw/class/clca7d.h
@@ -653,6 +653,10 @@
 #define NVCA7D_HEAD_SET_PIXEL_CLOCK_FREQUENCY_MAX_ADJ1000DIV1001                31:31
 #define NVCA7D_HEAD_SET_PIXEL_CLOCK_FREQUENCY_MAX_ADJ1000DIV1001_FALSE          (0x00000000)
 #define NVCA7D_HEAD_SET_PIXEL_CLOCK_FREQUENCY_MAX_ADJ1000DIV1001_TRUE           (0x00000001)
+#define NVCA7D_HEAD_SET_PIXEL_CLOCK_FREQUENCY_HI(a)                             (0x000020C0 + (a)*0x00000800)
+#define NVCA7D_HEAD_SET_PIXEL_CLOCK_FREQUENCY_HI_HERTZ                          3:0
+#define NVCA7D_HEAD_SET_PIXEL_CLOCK_FREQUENCY_HI_MAX(a)                         (0x000020C4 + (a)*0x00000800)
+#define NVCA7D_HEAD_SET_PIXEL_CLOCK_FREQUENCY_HI_MAX_HERTZ                      3:0
 #define NVCA7D_HEAD_SET_HEAD_USAGE_BOUNDS(a)                                    (0x00002030 + (a)*0x00000800)
 #define NVCA7D_HEAD_SET_HEAD_USAGE_BOUNDS_CURSOR                                2:0
 #define NVCA7D_HEAD_SET_HEAD_USAGE_BOUNDS_CURSOR_USAGE_NONE                     (0x00000000)
-- 
2.55.0