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The SPI access to s6e63m0 is using the DBI protocol, so switch to using the elaborate DBI protocol implementation in the DRM DBI helper library. Acked-by: Noralf Trønnes <noralf@tronnes.org> Reviewed-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20210614181135.1124445-2-linus.walleij@linaro.org
141 lines
3.2 KiB
C
141 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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return s6e63m0_remove(&dsi->dev);
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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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