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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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df99dd9202
We were previously selecting 1024x768 and 32BPP as the default set-up for the PL111 consumers. This does not work on elder systems: the device tree bindings support a property "max-memory-bandwidth" in bytes/second that states that if you exceed this the memory bus will saturate. The result is flickering and unstable images. Parse the "max-memory-bandwidth" and respect it when intializing the driver. On the RealView PB11MP, Versatile and Integrator/CP we get a nice console as default with this code. Reviewed-by: Eric Anholt <eric@anholt.net> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20180307215819.15814-1-linus.walleij@linaro.org
89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/*
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*
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* (C) COPYRIGHT 2012-2013 ARM Limited. All rights reserved.
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*
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*
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* Parts of this file were based on sources as follows:
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*
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* Copyright (c) 2006-2008 Intel Corporation
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* Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
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* Copyright (C) 2011 Texas Instruments
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*
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* This program is free software and is provided to you under the terms of the
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* GNU General Public License version 2 as published by the Free Software
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* Foundation, and any use by you of this program is subject to the terms of
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* such GNU licence.
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*
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*/
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#ifndef _PL111_DRM_H_
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#define _PL111_DRM_H_
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#include <drm/drm_gem.h>
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#include <drm/drm_simple_kms_helper.h>
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#include <drm/drm_connector.h>
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#include <drm/drm_encoder.h>
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#include <drm/drm_panel.h>
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#include <drm/drm_bridge.h>
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#include <linux/clk-provider.h>
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#include <linux/interrupt.h>
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#define CLCD_IRQ_NEXTBASE_UPDATE BIT(2)
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struct drm_minor;
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/**
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* struct pl111_variant_data - encodes IP differences
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* @name: the name of this variant
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* @is_pl110: this is the early PL110 variant
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* @external_bgr: this is the Versatile Pl110 variant with external
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* BGR/RGB routing
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* @broken_clockdivider: the clock divider is broken and we need to
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* use the supplied clock directly
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* @broken_vblank: the vblank IRQ is broken on this variant
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* @formats: array of supported pixel formats on this variant
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* @nformats: the length of the array of supported pixel formats
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* @fb_bpp: desired bits per pixel on the default framebuffer
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*/
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struct pl111_variant_data {
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const char *name;
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bool is_pl110;
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bool external_bgr;
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bool broken_clockdivider;
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bool broken_vblank;
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const u32 *formats;
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unsigned int nformats;
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unsigned int fb_bpp;
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};
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struct pl111_drm_dev_private {
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struct drm_device *drm;
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struct drm_connector *connector;
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struct drm_panel *panel;
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struct drm_bridge *bridge;
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struct drm_simple_display_pipe pipe;
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void *regs;
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u32 memory_bw;
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u32 ienb;
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u32 ctrl;
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/* The pixel clock (a reference to our clock divider off of CLCDCLK). */
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struct clk *clk;
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/* pl111's internal clock divider. */
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struct clk_hw clk_div;
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/* Lock to sync access to CLCD_TIM2 between the common clock
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* subsystem and pl111_display_enable().
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*/
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spinlock_t tim2_lock;
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const struct pl111_variant_data *variant;
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void (*variant_display_enable) (struct drm_device *drm, u32 format);
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void (*variant_display_disable) (struct drm_device *drm);
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};
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int pl111_display_init(struct drm_device *dev);
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irqreturn_t pl111_irq(int irq, void *data);
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int pl111_debugfs_init(struct drm_minor *minor);
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#endif /* _PL111_DRM_H_ */
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