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140 lines
4.7 KiB
Diff
140 lines
4.7 KiB
Diff
From b2cd1b1c95adc11e78a8d688a196c2f7786c1682 Mon Sep 17 00:00:00 2001
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From: Raptor Engineering Development Team <support@raptorengineering.com>
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Date: Tue, 18 Feb 2020 16:24:55 -0600
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Subject: [PATCH] drm/ast: Add option to initialize palette on driver load
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Non-x86 systems, such as OpenPOWER and ARM machines, do not execute the ASPEED-
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provided option ROM on system start. As a result, the VGA palette registers
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remain uninitialized, leading to odd colors and generally hard to read output
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on the VGA port.
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Add a new module option, ast_resetpalette, to enable loading a linear greyscale
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palette into the VGA RAMDAC. This option is intended for use by the first Linux
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kernel to load after initial power on, such as the skiroot kernel on OpenPOWER
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systems.
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Signed-off-by: Timothy Pearson <tpearson@raptorengineering.com>
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---
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drivers/gpu/drm/ast/ast_drv.c | 4 ++++
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drivers/gpu/drm/ast/ast_drv.h | 14 ++++++++++++++
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drivers/gpu/drm/ast/ast_main.c | 8 ++++++++
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drivers/gpu/drm/ast/ast_mode.c | 14 --------------
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4 files changed, 26 insertions(+), 14 deletions(-)
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diff --git a/drivers/gpu/drm/ast/ast_drv.c b/drivers/gpu/drm/ast/ast_drv.c
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index 1f17794..0b9ffee 100644
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--- a/drivers/gpu/drm/ast/ast_drv.c
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+++ b/drivers/gpu/drm/ast/ast_drv.c
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@@ -1,5 +1,6 @@
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/*
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* Copyright 2012 Red Hat Inc.
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+ * Copyright 2018 - 2020 Raptor Engineering, LLC.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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@@ -39,9 +40,12 @@
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#include "ast_drv.h"
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int ast_modeset = -1;
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+int ast_resetpalette = -1;
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MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
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+MODULE_PARM_DESC(resetpalette, "Disable/Enable palette reset on load");
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module_param_named(modeset, ast_modeset, int, 0400);
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+module_param_named(resetpalette, ast_resetpalette, int, 0400);
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#define PCI_VENDOR_ASPEED 0x1a03
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diff --git a/drivers/gpu/drm/ast/ast_drv.h b/drivers/gpu/drm/ast/ast_drv.h
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index ff161bd..bd30b0a 100644
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--- a/drivers/gpu/drm/ast/ast_drv.h
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+++ b/drivers/gpu/drm/ast/ast_drv.h
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@@ -283,6 +283,20 @@ struct ast_vbios_mode_info {
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extern int ast_mode_init(struct drm_device *dev);
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extern void ast_mode_fini(struct drm_device *dev);
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+static inline void ast_load_palette_index(struct ast_private *ast,
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+ u8 index, u8 red, u8 green,
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+ u8 blue)
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+{
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+ ast_io_write8(ast, AST_IO_DAC_INDEX_WRITE, index);
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+ ast_io_read8(ast, AST_IO_SEQ_PORT);
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+ ast_io_write8(ast, AST_IO_DAC_DATA, red);
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+ ast_io_read8(ast, AST_IO_SEQ_PORT);
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+ ast_io_write8(ast, AST_IO_DAC_DATA, green);
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+ ast_io_read8(ast, AST_IO_SEQ_PORT);
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+ ast_io_write8(ast, AST_IO_DAC_DATA, blue);
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+ ast_io_read8(ast, AST_IO_SEQ_PORT);
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+}
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+
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#define AST_MM_ALIGN_SHIFT 4
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#define AST_MM_ALIGN_MASK ((1 << AST_MM_ALIGN_SHIFT) - 1)
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diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c
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index 21715d6..8590118 100644
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--- a/drivers/gpu/drm/ast/ast_main.c
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+++ b/drivers/gpu/drm/ast/ast_main.c
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@@ -1,5 +1,6 @@
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/*
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* Copyright 2012 Red Hat Inc.
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+ * Copyright 2018 - 2020 Raptor Engineering, LLC.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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@@ -36,6 +37,8 @@
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#include "ast_drv.h"
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+extern int ast_resetpalette;
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+
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void ast_set_index_reg_mask(struct ast_private *ast,
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uint32_t base, uint8_t index,
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uint8_t mask, uint8_t val)
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@@ -428,6 +431,7 @@ int ast_driver_load(struct drm_device *dev, unsigned long flags)
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struct ast_private *ast;
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bool need_post;
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int ret = 0;
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+ int index = 0;
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ast = kzalloc(sizeof(struct ast_private), GFP_KERNEL);
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if (!ast)
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@@ -510,6 +514,10 @@ int ast_driver_load(struct drm_device *dev, unsigned long flags)
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if (ret)
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goto out_free;
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+ if (ast_resetpalette == 1)
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+ for (index = 0x00; index < 0x100; index++)
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+ ast_load_palette_index(ast, index, index, index, index);
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+
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return 0;
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out_free:
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kfree(ast);
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diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
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index b13eaa2..c8fa9f4 100644
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--- a/drivers/gpu/drm/ast/ast_mode.c
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+++ b/drivers/gpu/drm/ast/ast_mode.c
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@@ -51,20 +51,6 @@ static int ast_cursor_set(struct drm_crtc *crtc,
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static int ast_cursor_move(struct drm_crtc *crtc,
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int x, int y);
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-static inline void ast_load_palette_index(struct ast_private *ast,
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- u8 index, u8 red, u8 green,
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- u8 blue)
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-{
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- ast_io_write8(ast, AST_IO_DAC_INDEX_WRITE, index);
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- ast_io_read8(ast, AST_IO_SEQ_PORT);
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- ast_io_write8(ast, AST_IO_DAC_DATA, red);
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- ast_io_read8(ast, AST_IO_SEQ_PORT);
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- ast_io_write8(ast, AST_IO_DAC_DATA, green);
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- ast_io_read8(ast, AST_IO_SEQ_PORT);
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- ast_io_write8(ast, AST_IO_DAC_DATA, blue);
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- ast_io_read8(ast, AST_IO_SEQ_PORT);
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-}
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-
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static void ast_crtc_load_lut(struct drm_crtc *crtc)
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{
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struct ast_private *ast = crtc->dev->dev_private;
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--
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1.9.1
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