Hi Am 29.09.22 um 15:20 schrieb Jocelyn Falempe:
The current ast driver only supports legacy gamma interface.
This also fixes a Gnome3/Wayland error which incorrectly adds
gamma to atomic commit:
"Page flip discarded: CRTC property (GAMMA_LUT) not found"
I only tested remotely, so I wasn't able to check that it had
an effect on the VGA output. But when activating "Night Light"
in Gnome, ast_crtc_load_lut() is called.
v2: use the same functions as mgag200.
handle 16bits color mode.
Signed-off-by: Jocelyn Falempe <jfalempe@xxxxxxxxxx>
That works well on my AST2300 test system. The one thing missing is the CRTC's atomic_check code. See
https://cgit.freedesktop.org/drm/drm-tip/tree/drivers/gpu/drm/mgag200/mgag200_mode.c#n597 for what to do. With this test implemented, you can add Tested-by: Thomas Zimmermann <tzimmermann@xxxxxxx> Reviewed-by: Thomas Zimmermann <tzimmermann@xxxxxxx> to the patch. Best regards Thomas
--- drivers/gpu/drm/ast/ast_mode.c | 94 ++++++++++++++++++++++++++++------ 1 file changed, 77 insertions(+), 17 deletions(-) diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c index 214b10178454..06ea13c3a9b4 100644 --- a/drivers/gpu/drm/ast/ast_mode.c +++ b/drivers/gpu/drm/ast/ast_mode.c @@ -49,6 +49,8 @@ #include "ast_drv.h" #include "ast_tables.h"+#define AST_LUT_SIZE 256+ static inline void ast_load_palette_index(struct ast_private *ast, u8 index, u8 red, u8 green, u8 blue) @@ -63,20 +65,71 @@ static inline void ast_load_palette_index(struct ast_private *ast, ast_io_read8(ast, AST_IO_SEQ_PORT); }-static void ast_crtc_load_lut(struct ast_private *ast, struct drm_crtc *crtc)+static void ast_crtc_set_gamma_linear(struct ast_private *ast, + const struct drm_format_info *format) { - u16 *r, *g, *b; int i;- if (!crtc->enabled)- return; + switch (format->format) { + case DRM_FORMAT_RGB565: + /* Use better interpolation, to take 32 values from 0 to 255 */ + for (i = 0; i < AST_LUT_SIZE / 8; i++) + ast_load_palette_index(ast, + i, + i * 8 + i / 4, + i * 4 + i / 16, + i * 8 + i / 4); + /* Green has one more bit, so add padding with 0 for red and blue. */ + for (i = AST_LUT_SIZE / 8; i < AST_LUT_SIZE / 4; i++) + ast_load_palette_index(ast, i, 0, i * 4 + i / 16, 0); + break; + case DRM_FORMAT_C8: /* In this case, gamma table is used as color palette */ + case DRM_FORMAT_RGB888: + case DRM_FORMAT_XRGB8888: + for (i = 0; i < AST_LUT_SIZE; i++) + ast_load_palette_index(ast, i, i, i, i); + break; + default: + drm_warn_once(&ast->base, "Unsupported format %p4cc for gamma correction\n", + &format->format); + break; + } +}- r = crtc->gamma_store;- g = r + crtc->gamma_size; - b = g + crtc->gamma_size; +static void ast_crtc_set_gamma(struct ast_private *ast, + const struct drm_format_info *format, + struct drm_color_lut *lut) +{ + int i;- for (i = 0; i < 256; i++)- ast_load_palette_index(ast, i, *r++ >> 8, *g++ >> 8, *b++ >> 8); + switch (format->format) { + case DRM_FORMAT_RGB565: + /* Use better interpolation, to take 32 values from lut[0] to lut[255] */ + for (i = 0; i < AST_LUT_SIZE / 8; i++) + ast_load_palette_index(ast, + i, + lut[i * 8 + i / 4].red >> 8, + lut[i * 4 + i / 16].green >> 8, + lut[i * 8 + i / 4].blue >> 8); + /* Green has one more bit, so add padding with 0 for red and blue. */ + for (i = AST_LUT_SIZE / 8; i < AST_LUT_SIZE / 4; i++) + ast_load_palette_index(ast, i, 0, lut[i * 4 + i / 16].green >> 8, 0); + break; + case DRM_FORMAT_C8: /* In this case, gamma table is used as color palette */ + case DRM_FORMAT_RGB888: + case DRM_FORMAT_XRGB8888: + for (i = 0; i < AST_LUT_SIZE; i++) + ast_load_palette_index(ast, + i, + lut[i].red >> 8, + lut[i].green >> 8, + lut[i].blue >> 8); + break; + default: + drm_warn_once(&ast->base, "Unsupported format %p4cc for gamma correction\n", + &format->format); + break; + } }static bool ast_get_vbios_mode_info(const struct drm_format_info *format,@@ -1018,9 +1071,11 @@ static void ast_crtc_dpms(struct drm_crtc *crtc, int mode)ast_set_color_reg(ast, format);ast_set_vbios_color_reg(ast, format, vbios_mode_info); + if (crtc->state->gamma_lut) + ast_crtc_set_gamma(ast, format, crtc->state->gamma_lut->data); + else + ast_crtc_set_gamma_linear(ast, format); } - - ast_crtc_load_lut(ast, crtc); break; case DRM_MODE_DPMS_STANDBY: case DRM_MODE_DPMS_SUSPEND: @@ -1158,20 +1213,23 @@ ast_crtc_helper_atomic_flush(struct drm_crtc *crtc, { struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc); - struct drm_crtc_state *old_crtc_state = drm_atomic_get_old_crtc_state(state, - crtc); struct drm_device *dev = crtc->dev; struct ast_private *ast = to_ast_private(dev); struct ast_crtc_state *ast_crtc_state = to_ast_crtc_state(crtc_state); - struct ast_crtc_state *old_ast_crtc_state = to_ast_crtc_state(old_crtc_state); struct ast_vbios_mode_info *vbios_mode_info = &ast_crtc_state->vbios_mode_info;/** The gamma LUT has to be reloaded after changing the primary * plane's color format. */ - if (old_ast_crtc_state->format != ast_crtc_state->format) - ast_crtc_load_lut(ast, crtc); + if (crtc_state->enable && crtc_state->color_mgmt_changed) { + if (crtc_state->gamma_lut) + ast_crtc_set_gamma(ast, + ast_crtc_state->format, + crtc_state->gamma_lut->data); + else + ast_crtc_set_gamma_linear(ast, ast_crtc_state->format); + }//Set Aspeed Display-Portif (ast->tx_chip_types & AST_TX_ASTDP_BIT) @@ -1309,7 +1367,9 @@ static int ast_crtc_init(struct drm_device *dev) if (ret) return ret;- drm_mode_crtc_set_gamma_size(crtc, 256);+ drm_mode_crtc_set_gamma_size(crtc, AST_LUT_SIZE); + drm_crtc_enable_color_mgmt(crtc, 0, false, AST_LUT_SIZE); + drm_crtc_helper_add(crtc, &ast_crtc_helper_funcs);return 0;
-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 Nürnberg, Germany (HRB 36809, AG Nürnberg) Geschäftsführer: Ivo Totev
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