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90c45fc15a
Up to now s6e63m0_remove() returns zero unconditionally. Make it return void instead which makes it easier to see in the callers that there is no error to handle. Also the return value of spi remove callbacks is ignored anyway. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Link: https://patchwork.freedesktop.org/patch/msgid/20211011132754.2479853-2-u.kleine-koenig@pengutronix.de
142 lines
3.2 KiB
C
142 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* DSI interface to the Samsung S6E63M0 panel.
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* (C) 2019 Linus Walleij
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*/
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/of_device.h>
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#include <drm/drm_mipi_dsi.h>
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#include <drm/drm_print.h>
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#include "panel-samsung-s6e63m0.h"
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#define MCS_GLOBAL_PARAM 0xb0
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#define S6E63M0_DSI_MAX_CHUNK 15 /* CMD + 15 bytes max */
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static int s6e63m0_dsi_dcs_read(struct device *dev, void *trsp,
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const u8 cmd, u8 *data)
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{
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struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
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int ret;
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ret = mipi_dsi_dcs_read(dsi, cmd, data, 1);
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if (ret < 0) {
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dev_err(dev, "could not read DCS CMD %02x\n", cmd);
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return ret;
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}
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dev_dbg(dev, "DSI read CMD %02x = %02x\n", cmd, *data);
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return 0;
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}
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static int s6e63m0_dsi_dcs_write(struct device *dev, void *trsp,
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const u8 *data, size_t len)
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{
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struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
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const u8 *seqp = data;
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u8 cmd;
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u8 cmdwritten;
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int remain;
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int chunk;
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int ret;
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dev_dbg(dev, "DSI writing dcs seq: %*ph\n", (int)len, data);
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/* Pick out and skip past the DCS command */
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cmd = *seqp;
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seqp++;
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cmdwritten = 0;
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remain = len - 1;
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chunk = remain;
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/* Send max S6E63M0_DSI_MAX_CHUNK bytes at a time */
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if (chunk > S6E63M0_DSI_MAX_CHUNK)
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chunk = S6E63M0_DSI_MAX_CHUNK;
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ret = mipi_dsi_dcs_write(dsi, cmd, seqp, chunk);
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if (ret < 0) {
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dev_err(dev, "error sending DCS command seq cmd %02x\n", cmd);
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return ret;
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}
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cmdwritten += chunk;
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seqp += chunk;
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while (cmdwritten < remain) {
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chunk = remain - cmdwritten;
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if (chunk > S6E63M0_DSI_MAX_CHUNK)
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chunk = S6E63M0_DSI_MAX_CHUNK;
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ret = mipi_dsi_dcs_write(dsi, MCS_GLOBAL_PARAM, &cmdwritten, 1);
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if (ret < 0) {
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dev_err(dev, "error sending CMD %02x global param %02x\n",
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cmd, cmdwritten);
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return ret;
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}
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ret = mipi_dsi_dcs_write(dsi, cmd, seqp, chunk);
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if (ret < 0) {
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dev_err(dev, "error sending CMD %02x chunk\n", cmd);
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return ret;
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}
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cmdwritten += chunk;
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seqp += chunk;
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}
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dev_dbg(dev, "sent command %02x %02x bytes\n", cmd, cmdwritten);
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usleep_range(8000, 9000);
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return 0;
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}
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static int s6e63m0_dsi_probe(struct mipi_dsi_device *dsi)
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{
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struct device *dev = &dsi->dev;
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int ret;
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dsi->lanes = 2;
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dsi->format = MIPI_DSI_FMT_RGB888;
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dsi->hs_rate = 349440000;
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dsi->lp_rate = 9600000;
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dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
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MIPI_DSI_MODE_VIDEO_BURST;
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ret = s6e63m0_probe(dev, NULL, s6e63m0_dsi_dcs_read,
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s6e63m0_dsi_dcs_write, true);
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if (ret)
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return ret;
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ret = mipi_dsi_attach(dsi);
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if (ret < 0)
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s6e63m0_remove(dev);
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return ret;
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}
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static int s6e63m0_dsi_remove(struct mipi_dsi_device *dsi)
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{
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mipi_dsi_detach(dsi);
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s6e63m0_remove(&dsi->dev);
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return 0;
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}
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static const struct of_device_id s6e63m0_dsi_of_match[] = {
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{ .compatible = "samsung,s6e63m0" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, s6e63m0_dsi_of_match);
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static struct mipi_dsi_driver s6e63m0_dsi_driver = {
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.probe = s6e63m0_dsi_probe,
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.remove = s6e63m0_dsi_remove,
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.driver = {
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.name = "panel-samsung-s6e63m0",
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.of_match_table = s6e63m0_dsi_of_match,
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},
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};
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module_mipi_dsi_driver(s6e63m0_dsi_driver);
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MODULE_AUTHOR("Linus Walleij <linusw@kernel.org>");
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MODULE_DESCRIPTION("s6e63m0 LCD DSI Driver");
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MODULE_LICENSE("GPL v2");
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