cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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tidss_encoder.c (2375B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com/
      4 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
      5 */
      6
      7#include <linux/export.h>
      8
      9#include <drm/drm_crtc.h>
     10#include <drm/drm_crtc_helper.h>
     11#include <drm/drm_panel.h>
     12#include <drm/drm_of.h>
     13
     14#include "tidss_crtc.h"
     15#include "tidss_drv.h"
     16#include "tidss_encoder.h"
     17
     18static int tidss_encoder_atomic_check(struct drm_encoder *encoder,
     19				      struct drm_crtc_state *crtc_state,
     20				      struct drm_connector_state *conn_state)
     21{
     22	struct drm_device *ddev = encoder->dev;
     23	struct tidss_crtc_state *tcrtc_state = to_tidss_crtc_state(crtc_state);
     24	struct drm_display_info *di = &conn_state->connector->display_info;
     25	struct drm_bridge *bridge;
     26	bool bus_flags_set = false;
     27
     28	dev_dbg(ddev->dev, "%s\n", __func__);
     29
     30	/*
     31	 * Take the bus_flags from the first bridge that defines
     32	 * bridge timings, or from the connector's display_info if no
     33	 * bridge defines the timings.
     34	 */
     35	drm_for_each_bridge_in_chain(encoder, bridge) {
     36		if (!bridge->timings)
     37			continue;
     38
     39		tcrtc_state->bus_flags = bridge->timings->input_bus_flags;
     40		bus_flags_set = true;
     41		break;
     42	}
     43
     44	if (!di->bus_formats || di->num_bus_formats == 0)  {
     45		dev_err(ddev->dev, "%s: No bus_formats in connected display\n",
     46			__func__);
     47		return -EINVAL;
     48	}
     49
     50	// XXX any cleaner way to set bus format and flags?
     51	tcrtc_state->bus_format = di->bus_formats[0];
     52	if (!bus_flags_set)
     53		tcrtc_state->bus_flags = di->bus_flags;
     54
     55	return 0;
     56}
     57
     58static void tidss_encoder_destroy(struct drm_encoder *encoder)
     59{
     60	drm_encoder_cleanup(encoder);
     61	kfree(encoder);
     62}
     63
     64static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
     65	.atomic_check = tidss_encoder_atomic_check,
     66};
     67
     68static const struct drm_encoder_funcs encoder_funcs = {
     69	.destroy = tidss_encoder_destroy,
     70};
     71
     72struct drm_encoder *tidss_encoder_create(struct tidss_device *tidss,
     73					 u32 encoder_type, u32 possible_crtcs)
     74{
     75	struct drm_encoder *enc;
     76	int ret;
     77
     78	enc = kzalloc(sizeof(*enc), GFP_KERNEL);
     79	if (!enc)
     80		return ERR_PTR(-ENOMEM);
     81
     82	enc->possible_crtcs = possible_crtcs;
     83
     84	ret = drm_encoder_init(&tidss->ddev, enc, &encoder_funcs,
     85			       encoder_type, NULL);
     86	if (ret < 0) {
     87		kfree(enc);
     88		return ERR_PTR(ret);
     89	}
     90
     91	drm_encoder_helper_add(enc, &encoder_helper_funcs);
     92
     93	dev_dbg(tidss->dev, "Encoder create done\n");
     94
     95	return enc;
     96}