drm/ast: Split ast_set_vbios_mode_info()

The implementation of ast_set_vbios_mode() converts a DRM display mode
and framebuffer into an adjusted mode and stores information for the
video BIOS to several scratch regsiters.

Here we split the function into individual functions that do the
conversion, set the VBIOS mode information and format information.
This makes it compatible with support for primary planes and atomic
modesetting.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191107083404.6852-6-tzimmermann@suse.de

diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
index 5feb687191e047e12cd5b721ec1cac9906018440..c4c9fca0f00cc8a0c905946c3875f6bb13c16003 100644 (file)
--- a/drivers/gpu/drm/ast/ast_mode.c
+++ b/drivers/gpu/drm/ast/ast_mode.c
@@ -82,13 +82,12 @@ static void ast_crtc_load_lut(struct drm_crtc *crtc)
                ast_load_palette_index(ast, i, *r++ >> 8, *g++ >> 8, *b++ >> 8);
 }
 
-static bool ast_get_vbios_mode_info(struct drm_crtc *crtc, struct drm_display_mode *mode,
+static bool ast_get_vbios_mode_info(const struct drm_framebuffer *fb,
+                                   const struct drm_display_mode *mode,
                                    struct drm_display_mode *adjusted_mode,
                                    struct ast_vbios_mode_info *vbios_mode)
 {
-       struct ast_private *ast = crtc->dev->dev_private;
-       const struct drm_framebuffer *fb = crtc->primary->fb;
-       u32 refresh_rate_index = 0, mode_id, color_index, refresh_rate;
+       u32 refresh_rate_index = 0, refresh_rate;
        const struct ast_vbios_enhtable *best = NULL;
        u32 hborder, vborder;
        bool check_sync;
@@ -96,22 +95,19 @@ static bool ast_get_vbios_mode_info(struct drm_crtc *crtc, struct drm_display_mo
        switch (fb->format->cpp[0] * 8) {
        case 8:
                vbios_mode->std_table = &vbios_stdtable[VGAModeIndex];
-               color_index = VGAModeIndex - 1;
                break;
        case 16:
                vbios_mode->std_table = &vbios_stdtable[HiCModeIndex];
-               color_index = HiCModeIndex;
                break;
        case 24:
        case 32:
                vbios_mode->std_table = &vbios_stdtable[TrueCModeIndex];
-               color_index = TrueCModeIndex;
                break;
        default:
                return false;
        }
 
-       switch (crtc->mode.crtc_hdisplay) {
+       switch (mode->crtc_hdisplay) {
        case 640:
                vbios_mode->enh_table = &res_640x480[refresh_rate_index];
                break;
@@ -122,7 +118,7 @@ static bool ast_get_vbios_mode_info(struct drm_crtc *crtc, struct drm_display_mo
                vbios_mode->enh_table = &res_1024x768[refresh_rate_index];
                break;
        case 1280:
-               if (crtc->mode.crtc_vdisplay == 800)
+               if (mode->crtc_vdisplay == 800)
                        vbios_mode->enh_table = &res_1280x800[refresh_rate_index];
                else
                        vbios_mode->enh_table = &res_1280x1024[refresh_rate_index];
@@ -134,7 +130,7 @@ static bool ast_get_vbios_mode_info(struct drm_crtc *crtc, struct drm_display_mo
                vbios_mode->enh_table = &res_1440x900[refresh_rate_index];
                break;
        case 1600:
-               if (crtc->mode.crtc_vdisplay == 900)
+               if (mode->crtc_vdisplay == 900)
                        vbios_mode->enh_table = &res_1600x900[refresh_rate_index];
                else
                        vbios_mode->enh_table = &res_1600x1200[refresh_rate_index];
@@ -143,7 +139,7 @@ static bool ast_get_vbios_mode_info(struct drm_crtc *crtc, struct drm_display_mo
                vbios_mode->enh_table = &res_1680x1050[refresh_rate_index];
                break;
        case 1920:
-               if (crtc->mode.crtc_vdisplay == 1080)
+               if (mode->crtc_vdisplay == 1080)
                        vbios_mode->enh_table = &res_1920x1080[refresh_rate_index];
                else
                        vbios_mode->enh_table = &res_1920x1200[refresh_rate_index];
@@ -154,7 +150,8 @@ static bool ast_get_vbios_mode_info(struct drm_crtc *crtc, struct drm_display_mo
 
        refresh_rate = drm_mode_vrefresh(mode);
        check_sync = vbios_mode->enh_table->flags & WideScreenMode;
-       do {
+
+       while (1) {
                const struct ast_vbios_enhtable *loop = vbios_mode->enh_table;
 
                while (loop->refresh_rate != 0xff) {
@@ -178,7 +175,8 @@ static bool ast_get_vbios_mode_info(struct drm_crtc *crtc, struct drm_display_mo
                if (best || !check_sync)
                        break;
                check_sync = 0;
-       } while (1);
+       }
+
        if (best)
                vbios_mode->enh_table = best;
 
@@ -203,34 +201,65 @@ static bool ast_get_vbios_mode_info(struct drm_crtc *crtc, struct drm_display_mo
                                         vbios_mode->enh_table->vfp +
                                         vbios_mode->enh_table->vsync);
 
-       refresh_rate_index = vbios_mode->enh_table->refresh_rate_index;
-       mode_id = vbios_mode->enh_table->mode_id;
+       return true;
+}
 
-       if (ast->chip == AST1180) {
-               /* TODO 1180 */
-       } else {
-               ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x8c, (u8)((color_index & 0xf) << 4));
-               ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x8d, refresh_rate_index & 0xff);
-               ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x8e, mode_id & 0xff);
-
-               ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x91, 0x00);
-               if (vbios_mode->enh_table->flags & NewModeInfo) {
-                       ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x91, 0xa8);
-                       ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x92,
-                                         fb->format->cpp[0] * 8);
-                       ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x93, adjusted_mode->clock / 1000);
-                       ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x94, adjusted_mode->crtc_hdisplay);
-                       ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x95, adjusted_mode->crtc_hdisplay >> 8);
-
-                       ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x96, adjusted_mode->crtc_vdisplay);
-                       ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x97, adjusted_mode->crtc_vdisplay >> 8);
-               }
+static void ast_set_vbios_color_reg(struct drm_crtc *crtc,
+                                   const struct drm_framebuffer *fb,
+                                   const struct ast_vbios_mode_info *vbios_mode)
+{
+       struct ast_private *ast = crtc->dev->dev_private;
+       u32 color_index;
+
+       switch (fb->format->cpp[0]) {
+       case 1:
+               color_index = VGAModeIndex - 1;
+               break;
+       case 2:
+               color_index = HiCModeIndex;
+               break;
+       case 3:
+       case 4:
+               color_index = TrueCModeIndex;
+       default:
+               return;
        }
 
-       return true;
+       ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x8c, (u8)((color_index & 0x0f) << 4));
+
+       ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x91, 0x00);
+
+       if (vbios_mode->enh_table->flags & NewModeInfo) {
+               ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x91, 0xa8);
+               ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x92, fb->format->cpp[0] * 8);
+       }
+}
+
+static void ast_set_vbios_mode_reg(struct drm_crtc *crtc,
+                                  const struct drm_display_mode *adjusted_mode,
+                                  const struct ast_vbios_mode_info *vbios_mode)
+{
+       struct ast_private *ast = crtc->dev->dev_private;
+       u32 refresh_rate_index, mode_id;
+
+       refresh_rate_index = vbios_mode->enh_table->refresh_rate_index;
+       mode_id = vbios_mode->enh_table->mode_id;
+
+       ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x8d, refresh_rate_index & 0xff);
+       ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x8e, mode_id & 0xff);
 
+       ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x91, 0x00);
 
+       if (vbios_mode->enh_table->flags & NewModeInfo) {
+               ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x91, 0xa8);
+               ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x93, adjusted_mode->clock / 1000);
+               ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x94, adjusted_mode->crtc_hdisplay);
+               ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x95, adjusted_mode->crtc_hdisplay >> 8);
+               ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x96, adjusted_mode->crtc_vdisplay);
+               ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x97, adjusted_mode->crtc_vdisplay >> 8);
+       }
 }
+
 static void ast_set_std_reg(struct drm_crtc *crtc, struct drm_display_mode *mode,
                            struct ast_vbios_mode_info *vbios_mode)
 {
@@ -581,20 +610,24 @@ static int ast_crtc_mode_set(struct drm_crtc *crtc,
 {
        struct drm_device *dev = crtc->dev;
        struct ast_private *ast = crtc->dev->dev_private;
+       const struct drm_framebuffer *fb = crtc->primary->fb;
        struct ast_vbios_mode_info vbios_mode;
-       bool ret;
+       bool succ;
+
        if (ast->chip == AST1180) {
                DRM_ERROR("AST 1180 modesetting not supported\n");
                return -EINVAL;
        }
 
-       ret = ast_get_vbios_mode_info(crtc, mode, adjusted_mode, &vbios_mode);
-       if (ret == false)
+       succ = ast_get_vbios_mode_info(fb, mode, adjusted_mode, &vbios_mode);
+       if (!succ)
                return -EINVAL;
+
        ast_open_key(ast);
 
+       ast_set_vbios_color_reg(crtc, fb, &vbios_mode);
+       ast_set_vbios_mode_reg(crtc, adjusted_mode, &vbios_mode);
        ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa1, 0x06);
-
        ast_set_std_reg(crtc, adjusted_mode, &vbios_mode);
        ast_set_crtc_reg(crtc, adjusted_mode, &vbios_mode);
        ast_set_offset_reg(crtc);