Re: [PATCH v11 09/12] drm/mediatek: add dsi transfer function

CK Hu
2017-01-18T07:52:04Z

Hi, YT:

On Wed, 2017-01-11 at 14:51 +0800, YT Shen wrote:
> From: shaoming chen <shaoming.chen@mediatek.com>
>
> add dsi read/write commands for transfer function
>
> Signed-off-by: shaoming chen <shaoming.chen@mediatek.com>

Acked-by: CK Hu <ck.hu@mediatek.com>

> ---
> drivers/gpu/drm/mediatek/mtk_dsi.c | 168 ++++++++++++++++++++++++++++++++++++-
> 1 file changed, 166 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index 474861a..b3c7fd8 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -24,6 +24,7 @@
> #include <linux/of_graph.h>
> #include <linux/phy/phy.h>
> #include <linux/platform_device.h>
> +#include <video/mipi_display.h>
> #include <video/videomode.h>
>
> #include "mtk_drm_ddp_comp.h"
> @@ -80,8 +81,16 @@
> #define DSI_HBP_WC 0x54
> #define DSI_HFP_WC 0x58
>
> +#define DSI_CMDQ_SIZE 0x60
> +#define CMDQ_SIZE 0x3f
> +
> #define DSI_HSTX_CKL_WC 0x64
>
> +#define DSI_RX_DATA0 0x74
> +#define DSI_RX_DATA1 0x78
> +#define DSI_RX_DATA2 0x7c
> +#define DSI_RX_DATA3 0x80
> +
> #define DSI_RACK 0x84
> #define RACK BIT(0)
>
> @@ -117,6 +126,15 @@
> #define CLK_HS_POST (0xff << 8)
> #define CLK_HS_EXIT (0xff << 16)
>
> +#define DSI_CMDQ0 0x180
> +#define CONFIG (0xff << 0)
> +#define SHORT_PACKET 0
> +#define LONG_PACKET 2
> +#define BTA BIT(2)
> +#define DATA_ID (0xff << 8)
> +#define DATA_0 (0xff << 16)
> +#define DATA_1 (0xff << 24)
> +
> #define T_LPX 5
> #define T_HS_PREP 6
> #define T_HS_TRAIL 8
> @@ -125,6 +143,12 @@
>
> #define NS_TO_CYCLE(n, c) ((n) / (c) + (((n) % (c)) ? 1 : 0))
>
> +#define MTK_DSI_HOST_IS_READ(type) \
> + ((type == MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM) || \
> + (type == MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM) || \
> + (type == MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM) || \
> + (type == MIPI_DSI_DCS_READ))
> +
> struct phy;
>
> struct mtk_dsi {
> @@ -497,12 +521,12 @@ static void mtk_dsi_irq_data_set(struct mtk_dsi *dsi, u32 irq_bit)
> dsi->irq_data |= irq_bit;
> }
>
> -static __maybe_unused void mtk_dsi_irq_data_clear(struct mtk_dsi *dsi, u32 irq_bit)
> +static void mtk_dsi_irq_data_clear(struct mtk_dsi *dsi, u32 irq_bit)
> {
> dsi->irq_data &= ~irq_bit;
> }
>
> -static __maybe_unused s32 mtk_dsi_wait_for_irq_done(struct mtk_dsi *dsi, u32 irq_flag,
> +static s32 mtk_dsi_wait_for_irq_done(struct mtk_dsi *dsi, u32 irq_flag,
> unsigned int timeout)
> {
> s32 ret = 0;
> @@ -832,9 +856,149 @@ static int mtk_dsi_host_detach(struct mipi_dsi_host *host,
> return 0;
> }
>
> +static void mtk_dsi_wait_for_idle(struct mtk_dsi *dsi)
> +{
> + u32 timeout_ms = 500000; /* total 1s ~ 2s timeout */
> +
> + while (timeout_ms--) {
> + if (!(readl(dsi->regs + DSI_INTSTA) & DSI_BUSY))
> + break;
> +
> + usleep_range(2, 4);
> + }
> +
> + if (timeout_ms == 0) {
> + DRM_WARN("polling dsi wait not busy timeout!\n");
> +
> + mtk_dsi_enable(dsi);
> + mtk_dsi_reset_engine(dsi);
> + }
> +}
> +
> +static u32 mtk_dsi_recv_cnt(u8 type, u8 *read_data)
> +{
> + switch (type) {
> + case MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_1BYTE:
> + case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_1BYTE:
> + return 1;
> + case MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_2BYTE:
> + case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_2BYTE:
> + return 2;
> + case MIPI_DSI_RX_GENERIC_LONG_READ_RESPONSE:
> + case MIPI_DSI_RX_DCS_LONG_READ_RESPONSE:
> + return read_data[1] + read_data[2] * 16;
> + case MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT:
> + DRM_INFO("type is 0x02, try again\n");
> + break;
> + default:
> + DRM_INFO("type(0x%x) cannot be non-recognite\n", type);
> + break;
> + }
> +
> + return 0;
> +}
> +
> +static void mtk_dsi_cmdq(struct mtk_dsi *dsi, const struct mipi_dsi_msg *msg)
> +{
> + const char *tx_buf = msg->tx_buf;
> + u8 config, cmdq_size, cmdq_off, type = msg->type;
> + u32 reg_val, cmdq_mask, i;
> +
> + if (MTK_DSI_HOST_IS_READ(type))
> + config = BTA;
> + else
> + config = (msg->tx_len > 2) ? LONG_PACKET : SHORT_PACKET;
> +
> + if (msg->tx_len > 2) {
> + cmdq_size = 1 + (msg->tx_len + 3) / 4;
> + cmdq_off = 4;
> + cmdq_mask = CONFIG | DATA_ID | DATA_0 | DATA_1;
> + reg_val = (msg->tx_len << 16) | (type << 8) | config;
> + } else {
> + cmdq_size = 1;
> + cmdq_off = 2;
> + cmdq_mask = CONFIG | DATA_ID;
> + reg_val = (type << 8) | config;
> + }
> +
> + for (i = 0; i < msg->tx_len; i++)
> + writeb(tx_buf[i], dsi->regs + DSI_CMDQ0 + cmdq_off + i);
> +
> + mtk_dsi_mask(dsi, DSI_CMDQ0, cmdq_mask, reg_val);
> + mtk_dsi_mask(dsi, DSI_CMDQ_SIZE, CMDQ_SIZE, cmdq_size);
> +}
> +
> +static ssize_t mtk_dsi_host_send_cmd(struct mtk_dsi *dsi,
> + const struct mipi_dsi_msg *msg, u8 flag)
> +{
> + mtk_dsi_wait_for_idle(dsi);
> + mtk_dsi_irq_data_clear(dsi, flag);
> + mtk_dsi_cmdq(dsi, msg);
> + mtk_dsi_start(dsi);
> +
> + if (!mtk_dsi_wait_for_irq_done(dsi, flag, 2000))
> + return -ETIME;
> + else
> + return 0;
> +}
> +
> +static ssize_t mtk_dsi_host_transfer(struct mipi_dsi_host *host,
> + const struct mipi_dsi_msg *msg)
> +{
> + struct mtk_dsi *dsi = host_to_dsi(host);
> + u32 recv_cnt, i;
> + u8 read_data[16];
> + void *src_addr;
> + u8 irq_flag = CMD_DONE_INT_FLAG;
> +
> + if (readl(dsi->regs + DSI_MODE_CTRL) & MODE) {
> + DRM_ERROR("dsi engine is not command mode\n");
> + return -EINVAL;
> + }
> +
> + 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;
> +
> + if (!MTK_DSI_HOST_IS_READ(msg->type))
> + return 0;
> +
> + if (!msg->rx_buf) {
> + DRM_ERROR("dsi receive buffer size may be NULL\n");
> + return -EINVAL;
> + }
> +
> + for (i = 0; i < 16; i++)
> + *(read_data + i) = readb(dsi->regs + DSI_RX_DATA0 + i);
> +
> + recv_cnt = mtk_dsi_recv_cnt(read_data[0], read_data);
> +
> + if (recv_cnt > 2)
> + src_addr = &read_data[4];
> + else
> + src_addr = &read_data[1];
> +
> + if (recv_cnt > 10)
> + recv_cnt = 10;
> +
> + if (recv_cnt > msg->rx_len)
> + recv_cnt = msg->rx_len;
> +
> + if (recv_cnt)
> + memcpy(msg->rx_buf, src_addr, recv_cnt);
> +
> + DRM_INFO("dsi get %d byte data from the panel address(0x%x)\n",
> + recv_cnt, *((u8 *)(msg->tx_buf)));
> +
> + return recv_cnt;
> +}
> +
> static const struct mipi_dsi_host_ops mtk_dsi_ops = {
> .attach = mtk_dsi_host_attach,
> .detach = mtk_dsi_host_detach,
> + .transfer = mtk_dsi_host_transfer,
> };
>
> static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)