[PATCH v3 4/7] drm/i2c: adv7511: Create a MIPI DSI device
Archit Taneja
architt at codeaurora.org
Fri Apr 22 05:10:07 UTC 2016
Hi Laurent,
On 04/22/2016 03:59 AM, Laurent Pinchart wrote:
> Hi Archit,
>
> Thank you for the patch.
>
> On Wednesday 09 Mar 2016 16:27:15 Archit Taneja wrote:
>> In order to pass DSI specific parameters to the DSI host, we need the
>> driver to create a mipi_dsi_device DSI device that attaches to the
>> host.
>>
>> Use of_graph helpers to get the DSI host DT node. Create a MIPI DSI
>> device using this host. Finally, attach this device to the DSI host.
>>
>> Populate DT parameters (number of data lanes for now) that are required
>> for DSI RX to work correctly. Hardcode few other parameters (rgb,
>> embedded_sync) for now.
>>
>> Signed-off-by: Archit Taneja <architt at codeaurora.org>
>
> This adds a hard dependency on CONFIG_DRM_MIPI_DSI, otherwise the kernel won't
> link. As the ADV7511 doesn't require DSI, could you make it optional with
> conditional compilation to avoid pulling in dead code ?
You're right. The driver's Kconfig should at least select DRM_MIPI_DSI
in the current state to make sure we don't break build.
Do you suggest we create another config option for ADV7533, which
selects DRM_MIPI_DSI and builds the ADV7533 parts? Or did you mean
something else?
Thanks for the review.
Archit
>
>> ---
>> drivers/gpu/drm/i2c/adv7511.c | 130 ++++++++++++++++++++++++++++++++++++---
>> 1 file changed, 123 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i2c/adv7511.c b/drivers/gpu/drm/i2c/adv7511.c
>> index 75be17c..6c2a89a 100644
>> --- a/drivers/gpu/drm/i2c/adv7511.c
>> +++ b/drivers/gpu/drm/i2c/adv7511.c
>> @@ -11,6 +11,7 @@
>> #include <linux/i2c.h>
>> #include <linux/module.h>
>> #include <linux/of_device.h>
>> +#include <linux/of_graph.h>
>> #include <linux/regmap.h>
>> #include <linux/slab.h>
>>
>> @@ -19,6 +20,7 @@
>> #include <drm/drm_atomic_helper.h>
>> #include <drm/drm_crtc_helper.h>
>> #include <drm/drm_edid.h>
>> +#include <drm/drm_mipi_dsi.h>
>>
>> #include "adv7511.h"
>>
>> @@ -56,6 +58,11 @@ struct adv7511 {
>>
>> struct gpio_desc *gpio_pd;
>>
>> + /* ADV7533 DSI RX related params */
>> + struct device_node *host_node;
>> + struct mipi_dsi_device *dsi;
>> + u8 num_dsi_lanes;
>> +
>> enum adv7511_type type;
>> };
>>
>> @@ -392,8 +399,10 @@ static void adv7511_set_link_config(struct adv7511
>> *adv7511,
>>
>> static void adv7533_dsi_power_on(struct adv7511 *adv)
>> {
>> - /* set number of dsi lanes (hardcoded to 4 for now) */
>> - regmap_write(adv->regmap_cec, 0x1c, 0x4 << 4);
>> + struct mipi_dsi_device *dsi = adv->dsi;
>> +
>> + /* set number of dsi lanes */
>> + regmap_write(adv->regmap_cec, 0x1c, dsi->lanes << 4);
>> /* disable internal timing generator */
>> regmap_write(adv->regmap_cec, 0x27, 0x0b);
>> /* enable hdmi */
>> @@ -889,6 +898,51 @@ static void adv7511_bridge_mode_set(struct drm_bridge
>> *bridge, adv7511_mode_set(adv, mode, adj_mode);
>> }
>>
>> +static int adv7533_attach_dsi(struct adv7511 *adv)
>> +{
>> + struct device *dev = &adv->i2c_main->dev;
>> + struct mipi_dsi_host *host;
>> + struct mipi_dsi_device *dsi;
>> + int ret = 0;
>> + const struct mipi_dsi_device_info info = { .type = "adv7533",
>> + .channel = 0,
>> + .node = NULL,
>> + };
>> +
>> + host = of_find_mipi_dsi_host_by_node(adv->host_node);
>> + if (!host) {
>> + dev_err(dev, "failed to find dsi host\n");
>> + return -EPROBE_DEFER;
>> + }
>> +
>> + dsi = mipi_dsi_device_register_full(host, &info);
>> + if (IS_ERR(dsi)) {
>> + dev_err(dev, "failed to create dsi device\n");
>> + ret = PTR_ERR(dsi);
>> + goto err_dsi_device;
>> + }
>> +
>> + adv->dsi = dsi;
>> +
>> + dsi->lanes = adv->num_dsi_lanes;
>> + dsi->format = MIPI_DSI_FMT_RGB888;
>> + dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
>> + MIPI_DSI_MODE_EOT_PACKET | MIPI_DSI_MODE_VIDEO_HSE;
>> +
>> + ret = mipi_dsi_attach(dsi);
>> + if (ret < 0) {
>> + dev_err(dev, "failed to attach dsi to host\n");
>> + goto err_dsi_attach;
>> + }
>> +
>> + return 0;
>> +
>> +err_dsi_attach:
>> + mipi_dsi_device_unregister(dsi);
>> +err_dsi_device:
>> + return ret;
>> +}
>> +
>> static int adv7511_bridge_attach(struct drm_bridge *bridge)
>> {
>> struct adv7511 *adv = bridge_to_adv7511(bridge);
>> @@ -912,6 +966,9 @@ static int adv7511_bridge_attach(struct drm_bridge
>> *bridge) &adv7511_connector_helper_funcs);
>> drm_mode_connector_attach_encoder(&adv->connector, bridge->encoder);
>>
>> + if (adv->type == ADV7533)
>> + ret = adv7533_attach_dsi(adv);
>> +
>> return ret;
>> }
>>
>> @@ -1009,6 +1066,41 @@ static int adv7511_parse_dt(struct device_node *np,
>> return 0;
>> }
>>
>> +static int adv7533_parse_dt(struct device_node *np, struct adv7511 *adv)
>> +{
>> + u32 num_lanes;
>> + struct device_node *endpoint;
>> +
>> + of_property_read_u32(np, "adi,dsi-lanes", &num_lanes);
>> +
>> + if (num_lanes < 1 || num_lanes > 4)
>> + return -EINVAL;
>> +
>> + adv->num_dsi_lanes = num_lanes;
>> +
>> + endpoint = of_graph_get_next_endpoint(np, NULL);
>> + if (!endpoint) {
>> + DRM_ERROR("ADV7533 DSI input endpoint not found\n");
>> + return -ENODEV;
>> + }
>> +
>> + adv->host_node = of_graph_get_remote_port_parent(endpoint);
>> + if (!adv->host_node) {
>> + DRM_ERROR("DSI host node not found\n");
>> + of_node_put(endpoint);
>> + return -ENODEV;
>> + }
>> +
>> + of_node_put(endpoint);
>> + of_node_put(adv->host_node);
>> +
>> + /* TODO: Check if these need to be parsed by DT or not */
>> + adv->rgb = true;
>> + adv->embedded_sync = false;
>> +
>> + return 0;
>> +}
>> +
>> static const int edid_i2c_addr = 0x7e;
>> static const int packet_i2c_addr = 0x70;
>> static const int cec_i2c_addr = 0x78;
>> @@ -1038,11 +1130,12 @@ static int adv7511_probe(struct i2c_client *i2c,
>> const struct i2c_device_id *id)
>>
>> memset(&link_config, 0, sizeof(link_config));
>>
>> - if (adv7511->type == ADV7511) {
>> + if (adv7511->type == ADV7511)
>> ret = adv7511_parse_dt(dev->of_node, &link_config);
>> - if (ret)
>> - return ret;
>> - }
>> + else
>> + ret = adv7533_parse_dt(dev->of_node, adv7511);
>> + if (ret)
>> + return ret;
>>
>> /*
>> * The power down GPIO is optional. If present, toggle it from active to
>> @@ -1155,6 +1248,11 @@ static int adv7511_remove(struct i2c_client *i2c)
>> {
>> struct adv7511 *adv7511 = i2c_get_clientdata(i2c);
>>
>> + if (adv7511->type == ADV7533) {
>> + mipi_dsi_detach(adv7511->dsi);
>> + mipi_dsi_device_unregister(adv7511->dsi);
>> + }
>> +
>> drm_bridge_remove(&adv7511->bridge);
>>
>> i2c_unregister_device(adv7511->i2c_cec);
>> @@ -1183,6 +1281,10 @@ static const struct of_device_id adv7511_of_ids[] = {
>> };
>> MODULE_DEVICE_TABLE(of, adv7511_of_ids);
>>
>> +static struct mipi_dsi_driver adv7533_dsi_driver = {
>> + .driver.name = "adv7533",
>> +};
>> +
>> static struct i2c_driver adv7511_driver = {
>> .driver = {
>> .name = "adv7511",
>> @@ -1193,7 +1295,21 @@ static struct i2c_driver adv7511_driver = {
>> .remove = adv7511_remove,
>> };
>>
>> -module_i2c_driver(adv7511_driver);
>> +static int __init adv7511_init(void)
>> +{
>> + mipi_dsi_driver_register(&adv7533_dsi_driver);
>> +
>> + return i2c_add_driver(&adv7511_driver);
>> +}
>> +module_init(adv7511_init);
>> +
>> +static void __exit adv7511_exit(void)
>> +{
>> + i2c_del_driver(&adv7511_driver);
>> +
>> + mipi_dsi_driver_unregister(&adv7533_dsi_driver);
>> +}
>> +module_exit(adv7511_exit);
>>
>> MODULE_AUTHOR("Lars-Peter Clausen <lars at metafoo.de>");
>> MODULE_DESCRIPTION("ADV7511 HDMI transmitter driver");
>
--
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