From: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
To: Julien STEPHAN <jstephan@baylibre.com>
Cc: Mattijs Korpershoek <mkorpershoek@baylibre.com>,
Chun-Kuang Hu <chunkuang.hu@kernel.org>,
Philipp Zabel <p.zabel@pengutronix.de>,
David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
Matthias Brugger <matthias.bgg@gmail.com>,
"open list:DRM DRIVERS FOR MEDIATEK"
<dri-devel@lists.freedesktop.org>,
"moderated list:DRM DRIVERS FOR MEDIATEK"
<linux-mediatek@lists.infradead.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-arm-kernel@lists.infradead.org>,
open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v4] drm/mediatek: allow commands to be sent during video mode
Date: Mon, 14 Feb 2022 10:43:13 +0100 [thread overview]
Message-ID: <0a331caa-7578-60f5-cbd8-f6c8c29a629f@collabora.com> (raw)
In-Reply-To: <20220214092742.3461587-1-jstephan@baylibre.com>
Il 14/02/22 10:27, 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@baylibre.com>
> Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Please, next time, don't drop the tags that reviewers are giving to you, unless
the patch changes radically.
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> ---
> Changes in v4:
> - fix missing space: "ret : recv_cnt;"
> 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..abdd9cdebd86 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;
> }
>
> static const struct mipi_dsi_host_ops mtk_dsi_ops = {
> --
> 2.35.1
>
next prev parent reply other threads:[~2022-02-14 9:56 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-14 9:27 [PATCH v4] drm/mediatek: allow commands to be sent during video mode Julien STEPHAN
2022-02-14 9:43 ` AngeloGioacchino Del Regno [this message]
2022-02-17 15:15 ` Chun-Kuang Hu
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