drm/mgag200: Added support for the new device G200eH5

- Added the new device ID
- Added new pll algorithm

Signed-off-by: Gwenael Georgeault <ggeorgea@matrox.com>
Co-authored-by: Mamadou Insa Diop <mdiop@matrox.com>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/alpine.LFD.2.00.2502071401180.14188@pluton.matrox.com

drivers/gpu/drm/mgag200/Makefile

@@ -6,6 +6,7 @@ mgag200-y := \
 	mgag200_g200.o \
 	mgag200_g200eh.o \
 	mgag200_g200eh3.o \
+	mgag200_g200eh5.o \
 	mgag200_g200er.o \
 	mgag200_g200ev.o \
 	mgag200_g200ew3.o \

drivers/gpu/drm/mgag200/mgag200_drv.c

@@ -214,6 +214,7 @@ static const struct pci_device_id mgag200_pciidlist[] = {
 	{ PCI_VENDOR_ID_MATROX, 0x534, PCI_ANY_ID, PCI_ANY_ID, 0, 0, G200_ER },
 	{ PCI_VENDOR_ID_MATROX, 0x536, PCI_ANY_ID, PCI_ANY_ID, 0, 0, G200_EW3 },
 	{ PCI_VENDOR_ID_MATROX, 0x538, PCI_ANY_ID, PCI_ANY_ID, 0, 0, G200_EH3 },
+	{ PCI_VENDOR_ID_MATROX, 0x53a, PCI_ANY_ID, PCI_ANY_ID, 0, 0, G200_EH5 },
 	{0,}
 };
 
@@ -256,6 +257,9 @@ mgag200_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	case G200_EH3:
 		mdev = mgag200_g200eh3_device_create(pdev, &mgag200_driver);
 		break;
+	case G200_EH5:
+		mdev = mgag200_g200eh5_device_create(pdev, &mgag200_driver);
+		break;
 	case G200_ER:
 		mdev = mgag200_g200er_device_create(pdev, &mgag200_driver);
 		break;

drivers/gpu/drm/mgag200/mgag200_drv.h

@@ -196,6 +196,7 @@ enum mga_type {
 	G200_EV,
 	G200_EH,
 	G200_EH3,
+	G200_EH5,
 	G200_ER,
 	G200_EW3,
 };
@@ -334,6 +335,8 @@ struct mga_device *mgag200_g200eh_device_create(struct pci_dev *pdev,
 						const struct drm_driver *drv);
 struct mga_device *mgag200_g200eh3_device_create(struct pci_dev *pdev,
 						 const struct drm_driver *drv);
+struct mga_device *mgag200_g200eh5_device_create(struct pci_dev *pdev,
+						 const struct drm_driver *drv);
 struct mga_device *mgag200_g200er_device_create(struct pci_dev *pdev,
 						const struct drm_driver *drv);
 struct mga_device *mgag200_g200ew3_device_create(struct pci_dev *pdev,

drivers/gpu/drm/mgag200/mgag200_g200eh5.c

@@ -0,0 +1,204 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/limits.h>
+#include <linux/pci.h>
+#include <linux/units.h>
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_probe_helper.h>
+
+#include "mgag200_drv.h"
+
+/*
+ * PIXPLLC
+ */
+
+static int mgag200_g200eh5_pixpllc_atomic_check(struct drm_crtc *crtc,
+						struct drm_atomic_state *new_state)
+{
+	const unsigned long long VCO_MAX = 10 * GIGA; // Hz
+	const unsigned long long VCO_MIN = 2500 * MEGA; // Hz
+	const unsigned long long PLL_FREQ_REF = 25 * MEGA; // Hz
+
+	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);
+	long clock = new_crtc_state->mode.clock;
+	struct mgag200_pll_values *pixpllc = &new_mgag200_crtc_state->pixpllc;
+
+	unsigned long long fdelta = ULLONG_MAX;
+
+	u16 mult_max = (u16)(VCO_MAX / PLL_FREQ_REF); // 400 (0x190)
+	u16 mult_min = (u16)(VCO_MIN / PLL_FREQ_REF); // 100 (0x64)
+
+	u64 ftmp_delta;
+	u64 computed_fo;
+
+	u16 test_m;
+	u8 test_div_a;
+	u8 test_div_b;
+	u64 fo_hz;
+
+	u8 uc_m = 0;
+	u8 uc_n = 0;
+	u8 uc_p = 0;
+
+	fo_hz = (u64)clock * HZ_PER_KHZ;
+
+	for (test_m = mult_min; test_m <= mult_max; test_m++) { // This gives 100 <= M <= 400
+		for (test_div_a = 8; test_div_a > 0; test_div_a--) { // This gives 1 <= A <= 8
+			for (test_div_b = 1; test_div_b <= test_div_a; test_div_b++) {
+				// This gives 1 <= B <= A
+				computed_fo = (PLL_FREQ_REF * test_m) /
+					(4 * test_div_a * test_div_b);
+
+				if (computed_fo > fo_hz)
+					ftmp_delta = computed_fo - fo_hz;
+				else
+					ftmp_delta = fo_hz - computed_fo;
+
+				if (ftmp_delta < fdelta) {
+					fdelta = ftmp_delta;
+					uc_m = (u8)(0xFF & test_m);
+					uc_n = (u8)((0x7 & (test_div_a - 1))
+						| (0x70 & (0x7 & (test_div_b - 1)) << 4));
+					uc_p = (u8)(1 & (test_m >> 8));
+				}
+				if (fdelta == 0)
+					break;
+			}
+			if (fdelta == 0)
+				break;
+		}
+		if (fdelta == 0)
+			break;
+	}
+
+	pixpllc->m = uc_m + 1;
+	pixpllc->n = uc_n + 1;
+	pixpllc->p = uc_p + 1;
+	pixpllc->s = 0;
+
+	return 0;
+	}
+
+/*
+ * Mode-setting pipeline
+ */
+
+static const struct drm_plane_helper_funcs mgag200_g200eh5_primary_plane_helper_funcs = {
+	MGAG200_PRIMARY_PLANE_HELPER_FUNCS,
+};
+
+static const struct drm_plane_funcs mgag200_g200eh5_primary_plane_funcs = {
+	MGAG200_PRIMARY_PLANE_FUNCS,
+};
+
+static const struct drm_crtc_helper_funcs mgag200_g200eh5_crtc_helper_funcs = {
+	MGAG200_CRTC_HELPER_FUNCS,
+};
+
+static const struct drm_crtc_funcs mgag200_g200eh5_crtc_funcs = {
+	MGAG200_CRTC_FUNCS,
+};
+
+static int mgag200_g200eh5_pipeline_init(struct mga_device *mdev)
+{
+	struct drm_device *dev = &mdev->base;
+	struct drm_plane *primary_plane = &mdev->primary_plane;
+	struct drm_crtc *crtc = &mdev->crtc;
+	int ret;
+
+	ret = drm_universal_plane_init(dev, primary_plane, 0,
+				       &mgag200_g200eh5_primary_plane_funcs,
+				       mgag200_primary_plane_formats,
+				       mgag200_primary_plane_formats_size,
+				       mgag200_primary_plane_fmtmods,
+				       DRM_PLANE_TYPE_PRIMARY, NULL);
+	if (ret) {
+		drm_err(dev, "drm_universal_plane_init() failed: %d\n", ret);
+		return ret;
+	}
+	drm_plane_helper_add(primary_plane, &mgag200_g200eh5_primary_plane_helper_funcs);
+	drm_plane_enable_fb_damage_clips(primary_plane);
+
+	ret = drm_crtc_init_with_planes(dev, crtc, primary_plane, NULL,
+					&mgag200_g200eh5_crtc_funcs, NULL);
+	if (ret) {
+		drm_err(dev, "drm_crtc_init_with_planes() failed: %d\n", ret);
+		return ret;
+	}
+
+	drm_crtc_helper_add(crtc, &mgag200_g200eh5_crtc_helper_funcs);
+
+	/* FIXME: legacy gamma tables, but atomic gamma doesn't work without */
+	drm_mode_crtc_set_gamma_size(crtc, MGAG200_LUT_SIZE);
+	drm_crtc_enable_color_mgmt(crtc, 0, false, MGAG200_LUT_SIZE);
+	ret = mgag200_vga_bmc_output_init(mdev);
+
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+/*
+ * DRM device
+ */
+
+static const struct mgag200_device_info mgag200_g200eh5_device_info =
+	MGAG200_DEVICE_INFO_INIT(2048, 2048, 0, false, 1, 0, false);
+
+static const struct mgag200_device_funcs mgag200_g200eh5_device_funcs = {
+	.pixpllc_atomic_check = mgag200_g200eh5_pixpllc_atomic_check,
+	.pixpllc_atomic_update = mgag200_g200eh_pixpllc_atomic_update, // same as G200EH
+};
+
+struct mga_device *mgag200_g200eh5_device_create(struct pci_dev *pdev,
+						 const struct drm_driver *drv)
+{
+	struct mga_device *mdev;
+	struct drm_device *dev;
+	resource_size_t vram_available;
+	int ret;
+
+	mdev = devm_drm_dev_alloc(&pdev->dev, drv, struct mga_device, base);
+
+	if (IS_ERR(mdev))
+		return mdev;
+	dev = &mdev->base;
+
+	pci_set_drvdata(pdev, dev);
+
+	ret = mgag200_init_pci_options(pdev, 0x00000120, 0x0000b000);
+	if (ret)
+		return ERR_PTR(ret);
+
+	ret = mgag200_device_preinit(mdev);
+	if (ret)
+		return ERR_PTR(ret);
+
+	ret = mgag200_device_init(mdev, &mgag200_g200eh5_device_info,
+				  &mgag200_g200eh5_device_funcs);
+
+	if (ret)
+		return ERR_PTR(ret);
+
+	mgag200_g200eh_init_registers(mdev); // same as G200EH
+	vram_available = mgag200_device_probe_vram(mdev);
+
+	ret = mgag200_mode_config_init(mdev, vram_available);
+	if (ret)
+		return ERR_PTR(ret);
+
+	ret = mgag200_g200eh5_pipeline_init(mdev);
+	if (ret)
+		return ERR_PTR(ret);
+
+	drm_mode_config_reset(dev);
+	drm_kms_helper_poll_init(dev);
+
+	return mdev;
+}