drm/ast: Distinguish among chip generations

ASpeed distinguishes among various generations of the AST graphics
chipset with various models. [1] The most-recent model AST 2600 is
of the 7th generation, the AST 2500 is of the 6th generation, and so
on.

The ast driver simply picks one of the models as representative for
the whole generation. In several places, individual models of the
same generation need to be handled differently, which then requires
additional code for detecting the model.

Introduce different generations of the Aspeed chipset. In the source
code, refer to the generation instead of the representation model where
possible. The few places that require per-model handling are now clearly
marked.

In the enum ast_chip, we arrange each model's value such that it
encodes the generation. This allows for an easy test. The actual values
are ordered, but not of interest to the driver.

v2:
	* use __ast_gen_is_eq() (Jingfeng)
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://web.archive.org/web/20141007093258/http://www.aspeedtech.com/products.php?fPath=20 # 1
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Tested-by: Jocelyn Falempe <jfalempe@redhat.com> # AST2600
Reviewed-by: Sui Jingfeng <suijingfeng@loongson.cn>
Link: https://patchwork.freedesktop.org/patch/msgid/20230621130032.3568-10-tzimmermann@suse.de

drivers/gpu/drm/ast/ast_dp501.c

@@ -350,7 +350,7 @@ static bool ast_init_dvo(struct drm_device *dev)
 		data |= 0x00000500;
 		ast_write32(ast, 0x12008, data);
 
-		if (ast->chip == AST2300) {
+		if (IS_AST_GEN4(ast)) {
 			data = ast_read32(ast, 0x12084);
 			/* multi-pins for DVO single-edge */
 			data |= 0xfffe0000;
@@ -366,7 +366,7 @@ static bool ast_init_dvo(struct drm_device *dev)
 			data &= 0xffffffcf;
 			data |= 0x00000020;
 			ast_write32(ast, 0x12090, data);
-		} else { /* AST2400 */
+		} else { /* AST GEN5+ */
 			data = ast_read32(ast, 0x12088);
 			/* multi-pins for DVO single-edge */
 			data |= 0x30000000;
@@ -437,7 +437,7 @@ void ast_init_3rdtx(struct drm_device *dev)
 	struct ast_device *ast = to_ast_device(dev);
 	u8 jreg;
 
-	if (ast->chip == AST2300 || ast->chip == AST2400) {
+	if (IS_AST_GEN4(ast) || IS_AST_GEN5(ast)) {
 		jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd1, 0xff);
 		switch (jreg & 0x0e) {
 		case 0x04:

drivers/gpu/drm/ast/ast_drv.h

@@ -52,18 +52,38 @@
 #define PCI_CHIP_AST2000 0x2000
 #define PCI_CHIP_AST2100 0x2010
 
+#define __AST_CHIP(__gen, __index)	((__gen) << 16 | (__index))
+
 enum ast_chip {
-	AST2000,
-	AST2100,
-	AST1100,
-	AST2200,
-	AST2150,
-	AST2300,
-	AST2400,
-	AST2500,
-	AST2600,
+	/* 1st gen */
+	AST1000 = __AST_CHIP(1, 0), // unused
+	AST2000 = __AST_CHIP(1, 1),
+	/* 2nd gen */
+	AST1100 = __AST_CHIP(2, 0),
+	AST2100 = __AST_CHIP(2, 1),
+	AST2050 = __AST_CHIP(2, 2), // unused
+	/* 3rd gen */
+	AST2200 = __AST_CHIP(3, 0),
+	AST2150 = __AST_CHIP(3, 1),
+	/* 4th gen */
+	AST2300 = __AST_CHIP(4, 0),
+	AST1300 = __AST_CHIP(4, 1), // unused
+	AST1050 = __AST_CHIP(4, 2), // unused
+	/* 5th gen */
+	AST2400 = __AST_CHIP(5, 0),
+	AST1400 = __AST_CHIP(5, 1), // unused
+	AST1250 = __AST_CHIP(5, 2), // unused
+	/* 6th gen */
+	AST2500 = __AST_CHIP(6, 0),
+	AST2510 = __AST_CHIP(6, 1), // unused
+	AST2520 = __AST_CHIP(6, 2), // unused
+	/* 7th gen */
+	AST2600 = __AST_CHIP(7, 0),
+	AST2620 = __AST_CHIP(7, 1), // unused
 };
 
+#define __AST_CHIP_GEN(__chip)	(((unsigned long)(__chip)) >> 16)
+
 enum ast_tx_chip {
 	AST_TX_NONE,
 	AST_TX_SIL164,
@@ -217,6 +237,24 @@ struct ast_device *ast_device_create(const struct drm_driver *drv,
 				     struct pci_dev *pdev,
 				     unsigned long flags);
 
+static inline unsigned long __ast_gen(struct ast_device *ast)
+{
+	return __AST_CHIP_GEN(ast->chip);
+}
+#define AST_GEN(__ast)	__ast_gen(__ast)
+
+static inline bool __ast_gen_is_eq(struct ast_device *ast, unsigned long gen)
+{
+	return __ast_gen(ast) == gen;
+}
+#define IS_AST_GEN1(__ast)	__ast_gen_is_eq(__ast, 1)
+#define IS_AST_GEN2(__ast)	__ast_gen_is_eq(__ast, 2)
+#define IS_AST_GEN3(__ast)	__ast_gen_is_eq(__ast, 3)
+#define IS_AST_GEN4(__ast)	__ast_gen_is_eq(__ast, 4)
+#define IS_AST_GEN5(__ast)	__ast_gen_is_eq(__ast, 5)
+#define IS_AST_GEN6(__ast)	__ast_gen_is_eq(__ast, 6)
+#define IS_AST_GEN7(__ast)	__ast_gen_is_eq(__ast, 7)
+
 #define AST_IO_AR_PORT_WRITE		(0x40)
 #define AST_IO_MISC_PORT_WRITE		(0x42)
 #define AST_IO_VGA_ENABLE_PORT		(0x43)

drivers/gpu/drm/ast/ast_main.c

@@ -127,7 +127,7 @@ static void ast_detect_config_mode(struct drm_device *dev, u32 *scu_rev)
 	jregd0 = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd0, 0xff);
 	jregd1 = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd1, 0xff);
 	if (!(jregd0 & 0x80) || !(jregd1 & 0x10)) {
-		/* Patch AST2500 */
+		/* Patch GEN6 */
 		if (((pdev->revision & 0xF0) == 0x40)
 			&& ((jregd0 & AST_VRAM_INIT_STATUS_MASK) == 0))
 			ast_patch_ahb_2500(ast);
@@ -196,8 +196,8 @@ static int ast_detect_chip(struct drm_device *dev, bool need_post, u32 scu_rev)
 	}
 
 	/* Check if we support wide screen */
-	switch (ast->chip) {
-	case AST2000:
+	switch (AST_GEN(ast)) {
+	case 1:
 		ast->support_wide_screen = false;
 		break;
 	default:
@@ -217,7 +217,7 @@ static int ast_detect_chip(struct drm_device *dev, bool need_post, u32 scu_rev)
 			if (ast->chip == AST2500 &&
 			    scu_rev == 0x100)           /* ast2510 */
 				ast->support_wide_screen = true;
-			if (ast->chip == AST2600)		/* ast2600 */
+			if (IS_AST_GEN7(ast))
 				ast->support_wide_screen = true;
 		}
 		break;
@@ -240,9 +240,9 @@ static int ast_detect_chip(struct drm_device *dev, bool need_post, u32 scu_rev)
 			ast->tx_chip_types = AST_TX_SIL164_BIT;
 	}
 
-	if ((ast->chip == AST2300) || (ast->chip == AST2400) || (ast->chip == AST2500)) {
+	if (IS_AST_GEN4(ast) || IS_AST_GEN5(ast) || IS_AST_GEN6(ast)) {
 		/*
-		 * On AST2300 and 2400, look the configuration set by the SoC in
+		 * On AST GEN4+, look the configuration set by the SoC in
 		 * the SOC scratch register #1 bits 11:8 (interestingly marked
 		 * as "reserved" in the spec)
 		 */
@@ -264,7 +264,7 @@ static int ast_detect_chip(struct drm_device *dev, bool need_post, u32 scu_rev)
 		case 0x0c:
 			ast->tx_chip_types = AST_TX_DP501_BIT;
 		}
-	} else if (ast->chip == AST2600) {
+	} else if (IS_AST_GEN7(ast)) {
 		if (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xD1, TX_TYPE_MASK) ==
 		    ASTDP_DPMCU_TX) {
 			ast->tx_chip_types = AST_TX_ASTDP_BIT;
@@ -296,7 +296,7 @@ static int ast_get_dram_info(struct drm_device *dev)
 	case ast_use_dt:
 		/*
 		 * If some properties are missing, use reasonable
-		 * defaults for AST2400
+		 * defaults for GEN5
 		 */
 		if (of_property_read_u32(np, "aspeed,mcr-configuration",
 					 &mcr_cfg))
@@ -319,7 +319,7 @@ static int ast_get_dram_info(struct drm_device *dev)
 	default:
 		ast->dram_bus_width = 16;
 		ast->dram_type = AST_DRAM_1Gx16;
-		if (ast->chip == AST2500)
+		if (IS_AST_GEN6(ast))
 			ast->mclk = 800;
 		else
 			ast->mclk = 396;
@@ -331,7 +331,7 @@ static int ast_get_dram_info(struct drm_device *dev)
 	else
 		ast->dram_bus_width = 32;
 
-	if (ast->chip == AST2500) {
+	if (IS_AST_GEN6(ast)) {
 		switch (mcr_cfg & 0x03) {
 		case 0:
 			ast->dram_type = AST_DRAM_1Gx16;
@@ -347,7 +347,7 @@ static int ast_get_dram_info(struct drm_device *dev)
 			ast->dram_type = AST_DRAM_8Gx16;
 			break;
 		}
-	} else if (ast->chip == AST2300 || ast->chip == AST2400) {
+	} else if (IS_AST_GEN4(ast) || IS_AST_GEN5(ast)) {
 		switch (mcr_cfg & 0x03) {
 		case 0:
 			ast->dram_type = AST_DRAM_512Mx16;

drivers/gpu/drm/ast/ast_mode.c

@@ -342,7 +342,7 @@ static void ast_set_crtc_reg(struct ast_device *ast,
 	u8 jreg05 = 0, jreg07 = 0, jreg09 = 0, jregAC = 0, jregAD = 0, jregAE = 0;
 	u16 temp, precache = 0;
 
-	if ((ast->chip == AST2500 || ast->chip == AST2600) &&
+	if ((IS_AST_GEN6(ast) || IS_AST_GEN7(ast)) &&
 	    (vbios_mode->enh_table->flags & AST2500PreCatchCRT))
 		precache = 40;
 
@@ -384,7 +384,7 @@ static void ast_set_crtc_reg(struct ast_device *ast,
 	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xAD, 0x00, jregAD);
 
 	// Workaround for HSync Time non octave pixels (1920x1080@60Hz HSync 44 pixels);
-	if ((ast->chip == AST2600) && (mode->crtc_vdisplay == 1080))
+	if (IS_AST_GEN7(ast) && (mode->crtc_vdisplay == 1080))
 		ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xFC, 0xFD, 0x02);
 	else
 		ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xFC, 0xFD, 0x00);
@@ -466,7 +466,7 @@ static void ast_set_dclk_reg(struct ast_device *ast,
 {
 	const struct ast_vbios_dclk_info *clk_info;
 
-	if ((ast->chip == AST2500) || (ast->chip == AST2600))
+	if (IS_AST_GEN6(ast) || IS_AST_GEN7(ast))
 		clk_info = &dclk_table_ast2500[vbios_mode->enh_table->dclk_index];
 	else
 		clk_info = &dclk_table[vbios_mode->enh_table->dclk_index];
@@ -510,17 +510,13 @@ static void ast_set_color_reg(struct ast_device *ast,
 static void ast_set_crtthd_reg(struct ast_device *ast)
 {
 	/* Set Threshold */
-	if (ast->chip == AST2600) {
+	if (IS_AST_GEN7(ast)) {
 		ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa7, 0xe0);
 		ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa6, 0xa0);
-	} else if (ast->chip == AST2300 || ast->chip == AST2400 ||
-	    ast->chip == AST2500) {
+	} else if (IS_AST_GEN6(ast) || IS_AST_GEN5(ast) || IS_AST_GEN4(ast)) {
 		ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa7, 0x78);
 		ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa6, 0x60);
-	} else if (ast->chip == AST2100 ||
-		   ast->chip == AST1100 ||
-		   ast->chip == AST2200 ||
-		   ast->chip == AST2150) {
+	} else if (IS_AST_GEN3(ast) || IS_AST_GEN2(ast)) {
 		ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa7, 0x3f);
 		ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa6, 0x2f);
 	} else {
@@ -1082,9 +1078,10 @@ ast_crtc_helper_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode
 		if ((mode->hdisplay == 1152) && (mode->vdisplay == 864))
 			return MODE_OK;
 
-		if ((ast->chip == AST2100) || (ast->chip == AST2200) ||
-		    (ast->chip == AST2300) || (ast->chip == AST2400) ||
-		    (ast->chip == AST2500) || (ast->chip == AST2600)) {
+		if ((ast->chip == AST2100) || // GEN2, but not AST1100 (?)
+		    (ast->chip == AST2200) || // GEN3, but not AST2150 (?)
+		    IS_AST_GEN4(ast) || IS_AST_GEN5(ast) ||
+		    IS_AST_GEN6(ast) || IS_AST_GEN7(ast)) {
 			if ((mode->hdisplay == 1920) && (mode->vdisplay == 1080))
 				return MODE_OK;
 
@@ -1800,12 +1797,12 @@ int ast_mode_config_init(struct ast_device *ast)
 	dev->mode_config.min_height = 0;
 	dev->mode_config.preferred_depth = 24;
 
-	if (ast->chip == AST2100 ||
-	    ast->chip == AST2200 ||
-	    ast->chip == AST2300 ||
-	    ast->chip == AST2400 ||
-	    ast->chip == AST2500 ||
-	    ast->chip == AST2600) {
+	if (ast->chip == AST2100 || // GEN2, but not AST1100 (?)
+	    ast->chip == AST2200 || // GEN3, but not AST2150 (?)
+	    IS_AST_GEN7(ast) ||
+	    IS_AST_GEN6(ast) ||
+	    IS_AST_GEN5(ast) ||
+	    IS_AST_GEN4(ast)) {
 		dev->mode_config.max_width = 1920;
 		dev->mode_config.max_height = 2048;
 	} else {

drivers/gpu/drm/ast/ast_post.c

@@ -51,7 +51,7 @@ ast_set_def_ext_reg(struct drm_device *dev)
 	for (i = 0x81; i <= 0x9f; i++)
 		ast_set_index_reg(ast, AST_IO_CRTC_PORT, i, 0x00);
 
-	if (ast->chip == AST2300 || ast->chip == AST2400 || ast->chip == AST2500)
+	if (IS_AST_GEN4(ast) || IS_AST_GEN5(ast) || IS_AST_GEN6(ast))
 		ext_reg_info = extreginfo_ast2300;
 	else
 		ext_reg_info = extreginfo;
@@ -72,8 +72,7 @@ ast_set_def_ext_reg(struct drm_device *dev)
 
 	/* Enable RAMDAC for A1 */
 	reg = 0x04;
-	if (ast->chip == AST2300 || ast->chip == AST2400 ||
-	    ast->chip == AST2500)
+	if (IS_AST_GEN4(ast) || IS_AST_GEN5(ast) || IS_AST_GEN6(ast))
 		reg |= 0x20;
 	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb6, 0xff, reg);
 }
@@ -249,7 +248,7 @@ static void ast_init_dram_reg(struct drm_device *dev)
 	j = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd0, 0xff);
 
 	if ((j & 0x80) == 0) { /* VGA only */
-		if (ast->chip == AST2000) {
+		if (IS_AST_GEN1(ast)) {
 			dram_reg_info = ast2000_dram_table_data;
 			ast_write32(ast, 0xf004, 0x1e6e0000);
 			ast_write32(ast, 0xf000, 0x1);
@@ -258,7 +257,7 @@ static void ast_init_dram_reg(struct drm_device *dev)
 			do {
 				;
 			} while (ast_read32(ast, 0x10100) != 0xa8);
-		} else {/* AST2100/1100 */
+		} else { /* GEN2/GEN3 */
 			if (ast->chip == AST2100 || ast->chip == AST2200)
 				dram_reg_info = ast2100_dram_table_data;
 			else
@@ -281,7 +280,7 @@ static void ast_init_dram_reg(struct drm_device *dev)
 			if (dram_reg_info->index == 0xff00) {/* delay fn */
 				for (i = 0; i < 15; i++)
 					udelay(dram_reg_info->data);
-			} else if (dram_reg_info->index == 0x4 && ast->chip != AST2000) {
+			} else if (dram_reg_info->index == 0x4 && !IS_AST_GEN1(ast)) {
 				data = dram_reg_info->data;
 				if (ast->dram_type == AST_DRAM_1Gx16)
 					data = 0x00000d89;
@@ -307,15 +306,13 @@ static void ast_init_dram_reg(struct drm_device *dev)
 				cbrdlli_ast2150(ast, 32); /* 32 bits */
 		}
 
-		switch (ast->chip) {
-		case AST2000:
+		switch (AST_GEN(ast)) {
+		case 1:
 			temp = ast_read32(ast, 0x10140);
 			ast_write32(ast, 0x10140, temp | 0x40);
 			break;
-		case AST1100:
-		case AST2100:
-		case AST2200:
-		case AST2150:
+		case 2:
+		case 3:
 			temp = ast_read32(ast, 0x1200c);
 			ast_write32(ast, 0x1200c, temp & 0xfffffffd);
 			temp = ast_read32(ast, 0x12040);
@@ -338,13 +335,13 @@ void ast_post_gpu(struct drm_device *dev)
 
 	ast_set_def_ext_reg(dev);
 
-	if (ast->chip == AST2600) {
+	if (IS_AST_GEN7(ast)) {
 		if (ast->tx_chip_types & AST_TX_ASTDP_BIT)
 			ast_dp_launch(dev);
 	} else if (ast->config_mode == ast_use_p2a) {
-		if (ast->chip == AST2500)
+		if (IS_AST_GEN6(ast))
 			ast_post_chip_2500(dev);
-		else if (ast->chip == AST2300 || ast->chip == AST2400)
+		else if (IS_AST_GEN5(ast) || IS_AST_GEN4(ast))
 			ast_post_chip_2300(dev);
 		else
 			ast_init_dram_reg(dev);