[PATCH v3] drm/mediatek: allow commands to be sent during video mode
AngeloGioacchino Del Regno
angelogioacchino.delregno at collabora.com
Mon Feb 14 01:15:21 PST 2022
Il 14/02/22 09:47, Julien STEPHAN ha scritto:
> Mipi dsi panel drivers can use mipi_dsi_dcs_{set,get}_display_brightness()
> to request backlight changes.
>
> This can be done during panel initialization (dsi is in command mode)
> or afterwards (dsi is in Video Mode).
>
> When the DSI is in Video Mode, all commands are rejected.
>
> Detect current DSI mode in mtk_dsi_host_transfer() and switch modes
> temporarily to allow commands to be sent.
>
> Signed-off-by: Julien STEPHAN <jstephan at baylibre.com>
> Signed-off-by: Mattijs Korpershoek <mkorpershoek at baylibre.com>
> ---
> Changes in v3:
> - increase readability of code and use correct return variable (see
> comment https://lore.kernel.org/linux-mediatek/4907bdc1-b4a6-e9ad-5cfa-266fc20c0bec@collabora.com/)
>
> Changes in v2:
> - update commit message to be more descriptive
>
>
> drivers/gpu/drm/mediatek/mtk_dsi.c | 33 ++++++++++++++++++++++--------
> 1 file changed, 24 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index 5d90d2eb0019..7f1b2b7ed3fd 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -891,24 +891,33 @@ static ssize_t mtk_dsi_host_transfer(struct mipi_dsi_host *host,
> u8 read_data[16];
> void *src_addr;
> u8 irq_flag = CMD_DONE_INT_FLAG;
> + u32 dsi_mode;
> + int ret;
>
> - if (readl(dsi->regs + DSI_MODE_CTRL) & MODE) {
> - DRM_ERROR("dsi engine is not command mode\n");
> - return -EINVAL;
> + dsi_mode = readl(dsi->regs + DSI_MODE_CTRL);
> + if (dsi_mode & MODE) {
> + mtk_dsi_stop(dsi);
> + ret = mtk_dsi_switch_to_cmd_mode(dsi, VM_DONE_INT_FLAG, 500);
> + if (ret)
> + goto restore_dsi_mode;
> }
>
> if (MTK_DSI_HOST_IS_READ(msg->type))
> irq_flag |= LPRX_RD_RDY_INT_FLAG;
>
> - if (mtk_dsi_host_send_cmd(dsi, msg, irq_flag) < 0)
> - return -ETIME;
> + ret = mtk_dsi_host_send_cmd(dsi, msg, irq_flag);
> + if (ret)
> + goto restore_dsi_mode;
>
> - if (!MTK_DSI_HOST_IS_READ(msg->type))
> - return 0;
> + if (!MTK_DSI_HOST_IS_READ(msg->type)) {
> + recv_cnt = 0;
> + goto restore_dsi_mode;
> + }
>
> if (!msg->rx_buf) {
> DRM_ERROR("dsi receive buffer size may be NULL\n");
> - return -EINVAL;
> + ret = -EINVAL;
> + goto restore_dsi_mode;
> }
>
> for (i = 0; i < 16; i++)
> @@ -933,7 +942,13 @@ static ssize_t mtk_dsi_host_transfer(struct mipi_dsi_host *host,
> DRM_INFO("dsi get %d byte data from the panel address(0x%x)\n",
> recv_cnt, *((u8 *)(msg->tx_buf)));
>
> - return recv_cnt;
> +restore_dsi_mode:
> + if (dsi_mode & MODE) {
> + mtk_dsi_set_mode(dsi);
> + mtk_dsi_start(dsi);
> + }
> +
> + return ret < 0 ? ret: recv_cnt;
Nitpick: you've missed a space ... ret : recv_cnt;
With that fixed,
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
> }
>
> static const struct mipi_dsi_host_ops mtk_dsi_ops = {
> --
> 2.35.1
>
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