[PATCH v3 0/2] drm: aspeed: Support more chip families

[PATCH v3 0/2] drm: aspeed: Support more chip families

[Joel Stanley]

The out of tree vendor driver was recently updated to support the
ast2400 and ast2600. These patches begin to add that support to the
mainline driver.

With these two cleanups it should be easier to support different
families of BMC system on chip with this driver.

I will merge them through drm-misc once they have been reviewed.

v2 fixes review from Jeremy. Thanks!
v3 fixes the dt match table declaration

Joel Stanley (2):
  drm/aspeed: Look up syscon by phandle
  drm/aspeed: Use dt matching for default register values

 drivers/gpu/drm/aspeed/aspeed_gfx.h      |  8 +--
 drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c | 11 ++--
 drivers/gpu/drm/aspeed/aspeed_gfx_drv.c  | 67 ++++++++++++++++++------
 3 files changed, 62 insertions(+), 24 deletions(-)

-- 
2.30.0

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[PATCH v3 1/2] drm/aspeed: Look up syscon by phandle

[Joel Stanley]

This scales better to multiple families of SoC. The lookup by compatible
can be removed in a future change.

The fallback path is for the ast2500 platform only. Other platforms will
be added with the new style, so they won't need fallback paths.

Signed-off-by: Joel Stanley <joel@jms.id.au>
---
v2: Fix fallback path to still find ast2500-scu. Thanks jk for the
review
---
 drivers/gpu/drm/aspeed/aspeed_gfx_drv.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
index 457ec04950f7..54a6bda03c0e 100644
--- a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
+++ b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
@@ -103,6 +103,7 @@ static int aspeed_gfx_load(struct drm_device *drm)
 {
 	struct platform_device *pdev = to_platform_device(drm->dev);
 	struct aspeed_gfx *priv = to_aspeed_gfx(drm);
+	struct device_node *np = pdev->dev.of_node;
 	struct resource *res;
 	int ret;
 
@@ -111,10 +112,13 @@ static int aspeed_gfx_load(struct drm_device *drm)
 	if (IS_ERR(priv->base))
 		return PTR_ERR(priv->base);
 
-	priv->scu = syscon_regmap_lookup_by_compatible("aspeed,ast2500-scu");
+	priv->scu = syscon_regmap_lookup_by_phandle(np, "syscon");
 	if (IS_ERR(priv->scu)) {
-		dev_err(&pdev->dev, "failed to find SCU regmap\n");
-		return PTR_ERR(priv->scu);
+		priv->scu = syscon_regmap_lookup_by_compatible("aspeed,ast2500-scu");
+		if (IS_ERR(priv->scu)) {
+			dev_err(&pdev->dev, "failed to find SCU regmap\n");
+			return PTR_ERR(priv->scu);
+		}
 	}
 
 	ret = of_reserved_mem_device_init(drm->dev);
-- 
2.30.0

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[PATCH v3 2/2] drm/aspeed: Use dt matching for default register values

[Joel Stanley]

There are minor differences in the values for the threshold value and
the scan line size between families of ASPEED SoC. Additionally the SCU
registers for the output control and scratch registers differ between
families.

This adds device tree matching to parameterise these values, allowing us
to add support for the AST2400 now, and in the future the AST2600.

Reviewed-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>
---
v3:
 - Fix match table
v2:
 - Add jk's review
 - Clean up comments and unused define
 - Add VGA password register
---
 drivers/gpu/drm/aspeed/aspeed_gfx.h      |  8 ++--
 drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c | 11 ++---
 drivers/gpu/drm/aspeed/aspeed_gfx_drv.c  | 57 ++++++++++++++++++------
 3 files changed, 55 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx.h b/drivers/gpu/drm/aspeed/aspeed_gfx.h
index f1e7e56abc02..96501152bafa 100644
--- a/drivers/gpu/drm/aspeed/aspeed_gfx.h
+++ b/drivers/gpu/drm/aspeed/aspeed_gfx.h
@@ -11,6 +11,11 @@ struct aspeed_gfx {
 	struct reset_control		*rst;
 	struct regmap			*scu;
 
+	u32				dac_reg;
+	u32				vga_scratch_reg;
+	u32				throd_val;
+	u32				scan_line_max;
+
 	struct drm_simple_display_pipe	pipe;
 	struct drm_connector		connector;
 };
@@ -100,6 +105,3 @@ int aspeed_gfx_create_output(struct drm_device *drm);
 /* CRT_THROD */
 #define CRT_THROD_LOW(x)		(x)
 #define CRT_THROD_HIGH(x)		((x) << 8)
-
-/* Default Threshold Seting */
-#define G5_CRT_THROD_VAL	(CRT_THROD_LOW(0x24) | CRT_THROD_HIGH(0x3C))
diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c b/drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c
index e54686c31a90..20c2197b270f 100644
--- a/drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c
+++ b/drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c
@@ -59,8 +59,8 @@ static void aspeed_gfx_enable_controller(struct aspeed_gfx *priv)
 	u32 ctrl1 = readl(priv->base + CRT_CTRL1);
 	u32 ctrl2 = readl(priv->base + CRT_CTRL2);
 
-	/* SCU2C: set DAC source for display output to Graphics CRT (GFX) */
-	regmap_update_bits(priv->scu, 0x2c, BIT(16), BIT(16));
+	/* Set DAC source for display output to Graphics CRT (GFX) */
+	regmap_update_bits(priv->scu, priv->dac_reg, BIT(16), BIT(16));
 
 	writel(ctrl1 | CRT_CTRL_EN, priv->base + CRT_CTRL1);
 	writel(ctrl2 | CRT_CTRL_DAC_EN, priv->base + CRT_CTRL2);
@@ -74,7 +74,7 @@ static void aspeed_gfx_disable_controller(struct aspeed_gfx *priv)
 	writel(ctrl1 & ~CRT_CTRL_EN, priv->base + CRT_CTRL1);
 	writel(ctrl2 & ~CRT_CTRL_DAC_EN, priv->base + CRT_CTRL2);
 
-	regmap_update_bits(priv->scu, 0x2c, BIT(16), 0);
+	regmap_update_bits(priv->scu, priv->dac_reg, BIT(16), 0);
 }
 
 static void aspeed_gfx_crtc_mode_set_nofb(struct aspeed_gfx *priv)
@@ -127,7 +127,8 @@ static void aspeed_gfx_crtc_mode_set_nofb(struct aspeed_gfx *priv)
 	 * Terminal Count: memory size of one scan line
 	 */
 	d_offset = m->hdisplay * bpp / 8;
-	t_count = (m->hdisplay * bpp + 127) / 128;
+	t_count = DIV_ROUND_UP(m->hdisplay * bpp, priv->scan_line_max);
+
 	writel(CRT_DISP_OFFSET(d_offset) | CRT_TERM_COUNT(t_count),
 			priv->base + CRT_OFFSET);
 
@@ -135,7 +136,7 @@ static void aspeed_gfx_crtc_mode_set_nofb(struct aspeed_gfx *priv)
 	 * Threshold: FIFO thresholds of refill and stop (16 byte chunks
 	 * per line, rounded up)
 	 */
-	writel(G5_CRT_THROD_VAL, priv->base + CRT_THROD);
+	writel(priv->throd_val, priv->base + CRT_THROD);
 }
 
 static void aspeed_gfx_pipe_enable(struct drm_simple_display_pipe *pipe,
diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
index 54a6bda03c0e..6b3a01ba3e0d 100644
--- a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
+++ b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
@@ -7,6 +7,7 @@
 #include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/of_reserved_mem.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
@@ -57,6 +58,34 @@
  * which is available under NDA from ASPEED.
  */
 
+struct aspeed_gfx_config {
+	u32 dac_reg;		/* DAC register in SCU */
+	u32 vga_scratch_reg;	/* VGA scratch register in SCU */
+	u32 throd_val;		/* Default Threshold Seting */
+	u32 scan_line_max;	/* Max memory size of one scan line */
+};
+
+static const struct aspeed_gfx_config ast2400_config = {
+	.dac_reg = 0x2c,
+	.vga_scratch_reg = 0x50,
+	.throd_val = CRT_THROD_LOW(0x1e) | CRT_THROD_HIGH(0x12),
+	.scan_line_max = 64,
+};
+
+static const struct aspeed_gfx_config ast2500_config = {
+	.dac_reg = 0x2c,
+	.vga_scratch_reg = 0x50,
+	.throd_val = CRT_THROD_LOW(0x24) | CRT_THROD_HIGH(0x3c),
+	.scan_line_max = 128,
+};
+
+static const struct of_device_id aspeed_gfx_match[] = {
+	{ .compatible = "aspeed,ast2400-gfx", .data = &ast2400_config },
+	{ .compatible = "aspeed,ast2500-gfx", .data = &ast2500_config },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, aspeed_gfx_match);
+
 static const struct drm_mode_config_funcs aspeed_gfx_mode_config_funcs = {
 	.fb_create		= drm_gem_fb_create,
 	.atomic_check		= drm_atomic_helper_check,
@@ -97,13 +126,13 @@ static irqreturn_t aspeed_gfx_irq_handler(int irq, void *data)
 	return IRQ_NONE;
 }
 
-
-
 static int aspeed_gfx_load(struct drm_device *drm)
 {
 	struct platform_device *pdev = to_platform_device(drm->dev);
 	struct aspeed_gfx *priv = to_aspeed_gfx(drm);
 	struct device_node *np = pdev->dev.of_node;
+	const struct aspeed_gfx_config *config;
+	const struct of_device_id *match;
 	struct resource *res;
 	int ret;
 
@@ -112,6 +141,16 @@ static int aspeed_gfx_load(struct drm_device *drm)
 	if (IS_ERR(priv->base))
 		return PTR_ERR(priv->base);
 
+	match = of_match_device(aspeed_gfx_match, &pdev->dev);
+	if (!match)
+		return -EINVAL;
+	config = match->data;
+
+	priv->dac_reg = config->dac_reg;
+	priv->vga_scratch_reg = config->vga_scratch_reg;
+	priv->throd_val = config->throd_val;
+	priv->scan_line_max = config->scan_line_max;
+
 	priv->scu = syscon_regmap_lookup_by_phandle(np, "syscon");
 	if (IS_ERR(priv->scu)) {
 		priv->scu = syscon_regmap_lookup_by_compatible("aspeed,ast2500-scu");
@@ -206,14 +245,6 @@ static const struct drm_driver aspeed_gfx_driver = {
 	.minor = 0,
 };
 
-static const struct of_device_id aspeed_gfx_match[] = {
-	{ .compatible = "aspeed,ast2500-gfx" },
-	{ }
-};
-
-#define ASPEED_SCU_VGA0		0x50
-#define ASPEED_SCU_MISC_CTRL	0x2c
-
 static ssize_t dac_mux_store(struct device *dev, struct device_attribute *attr,
 			     const char *buf, size_t count)
 {
@@ -228,7 +259,7 @@ static ssize_t dac_mux_store(struct device *dev, struct device_attribute *attr,
 	if (val > 3)
 		return -EINVAL;
 
-	rc = regmap_update_bits(priv->scu, ASPEED_SCU_MISC_CTRL, 0x30000, val << 16);
+	rc = regmap_update_bits(priv->scu, priv->dac_reg, 0x30000, val << 16);
 	if (rc < 0)
 		return 0;
 
@@ -241,7 +272,7 @@ static ssize_t dac_mux_show(struct device *dev, struct device_attribute *attr, c
 	u32 reg;
 	int rc;
 
-	rc = regmap_read(priv->scu, ASPEED_SCU_MISC_CTRL, &reg);
+	rc = regmap_read(priv->scu, priv->dac_reg, &reg);
 	if (rc)
 		return rc;
 
@@ -256,7 +287,7 @@ vga_pw_show(struct device *dev, struct device_attribute *attr, char *buf)
 	u32 reg;
 	int rc;
 
-	rc = regmap_read(priv->scu, ASPEED_SCU_VGA0, &reg);
+	rc = regmap_read(priv->scu, priv->vga_scratch_reg, &reg);
 	if (rc)
 		return rc;
 
-- 
2.30.0

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Re: [PATCH v3 1/2] drm/aspeed: Look up syscon by phandle

[Andrew Jeffery]

On Tue, 9 Feb 2021, at 23:07, Joel Stanley wrote:
> This scales better to multiple families of SoC. The lookup by compatible
> can be removed in a future change.
> 
> The fallback path is for the ast2500 platform only. Other platforms will
> be added with the new style, so they won't need fallback paths.
> 
> Signed-off-by: Joel Stanley <joel@jms.id.au>

Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
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