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Message-ID: <81f04df5-218c-7f1e-98eb-9dad9cdcfa48@st.com>
Date: Wed, 10 Jun 2020 12:21:55 +0000
From: Yannick FERTRE <yannick.fertre@...com>
To: Adrian Ratiu <adrian.ratiu@...labora.com>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-rockchip@...ts.infradead.org"
<linux-rockchip@...ts.infradead.org>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
"Heiko Stuebner" <heiko@...ech.de>,
Philippe CORNU <philippe.cornu@...com>,
"Jernej Skrabec" <jernej.skrabec@...l.net>,
Andrzej Hajda <a.hajda@...sung.com>,
"Jonas Karlman" <jonas@...boo.se>,
"linux-imx@....com" <linux-imx@....com>,
"kernel@...labora.com" <kernel@...labora.com>,
"linux-stm32@...md-mailman.stormreply.com"
<linux-stm32@...md-mailman.stormreply.com>,
Adrian Pop <pop.adrian61@...il.com>,
Arnaud Ferraris <arnaud.ferraris@...labora.com>
Subject: Re: [PATCH v9 09/11] drm: bridge: dw-mipi-dsi: split low power cfg
register into fields
Hi Adrian,
thanks for the pach: tested on stm32mp1.
Tested-by: Yannick Fertré <yannick.fertre@...com>
On 6/9/20 7:49 PM, Adrian Ratiu wrote:
> According to the Host Registers documentation for IMX, STM and RK
> the LP cfg register should not be written entirely in one go because
> some bits are reserved and should be kept to reset values, for eg.
> BIT(15) which is reserved in all versions.
>
> This also cleans up the code by removing the the ugly defines
> and making field ranges & values written more explicit.
>
> Tested-by: Adrian Pop <pop.adrian61@...il.com>
> Tested-by: Arnaud Ferraris <arnaud.ferraris@...labora.com>
> Signed-off-by: Adrian Ratiu <adrian.ratiu@...labora.com>
> ---
> New in v6.
> ---
> drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 105 ++++++------------
> 1 file changed, 33 insertions(+), 72 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> index 70df0578cbe7b..1e47d40b5becb 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> @@ -120,60 +120,6 @@
> #define DSI_TO_CNT_CFG_V101 0x40
> #define DSI_PCKHDL_CFG_V101 0x18
>
> -#define MAX_RD_PKT_SIZE_LP BIT(24)
> -#define DCS_LW_TX_LP BIT(19)
> -#define DCS_SR_0P_TX_LP BIT(18)
> -#define DCS_SW_1P_TX_LP BIT(17)
> -#define DCS_SW_0P_TX_LP BIT(16)
> -#define GEN_LW_TX_LP BIT(14)
> -#define GEN_SR_2P_TX_LP BIT(13)
> -#define GEN_SR_1P_TX_LP BIT(12)
> -#define GEN_SR_0P_TX_LP BIT(11)
> -#define GEN_SW_2P_TX_LP BIT(10)
> -#define GEN_SW_1P_TX_LP BIT(9)
> -#define GEN_SW_0P_TX_LP BIT(8)
> -#define TEAR_FX_EN BIT(0)
> -
> -#define CMD_MODE_ALL_LP (MAX_RD_PKT_SIZE_LP | \
> - DCS_LW_TX_LP | \
> - DCS_SR_0P_TX_LP | \
> - DCS_SW_1P_TX_LP | \
> - DCS_SW_0P_TX_LP | \
> - GEN_LW_TX_LP | \
> - GEN_SR_2P_TX_LP | \
> - GEN_SR_1P_TX_LP | \
> - GEN_SR_0P_TX_LP | \
> - GEN_SW_2P_TX_LP | \
> - GEN_SW_1P_TX_LP | \
> - GEN_SW_0P_TX_LP)
> -
> -#define EN_TEAR_FX_V101 BIT(14)
> -#define DCS_LW_TX_LP_V101 BIT(12)
> -#define GEN_LW_TX_LP_V101 BIT(11)
> -#define MAX_RD_PKT_SIZE_LP_V101 BIT(10)
> -#define DCS_SW_2P_TX_LP_V101 BIT(9)
> -#define DCS_SW_1P_TX_LP_V101 BIT(8)
> -#define DCS_SW_0P_TX_LP_V101 BIT(7)
> -#define GEN_SR_2P_TX_LP_V101 BIT(6)
> -#define GEN_SR_1P_TX_LP_V101 BIT(5)
> -#define GEN_SR_0P_TX_LP_V101 BIT(4)
> -#define GEN_SW_2P_TX_LP_V101 BIT(3)
> -#define GEN_SW_1P_TX_LP_V101 BIT(2)
> -#define GEN_SW_0P_TX_LP_V101 BIT(1)
> -
> -#define CMD_MODE_ALL_LP_V101 (DCS_LW_TX_LP_V101 | \
> - GEN_LW_TX_LP_V101 | \
> - MAX_RD_PKT_SIZE_LP_V101 | \
> - DCS_SW_2P_TX_LP_V101 | \
> - DCS_SW_1P_TX_LP_V101 | \
> - DCS_SW_0P_TX_LP_V101 | \
> - GEN_SR_2P_TX_LP_V101 | \
> - GEN_SR_1P_TX_LP_V101 | \
> - GEN_SR_0P_TX_LP_V101 | \
> - GEN_SW_2P_TX_LP_V101 | \
> - GEN_SW_1P_TX_LP_V101 | \
> - GEN_SW_0P_TX_LP_V101)
> -
> #define DSI_GEN_HDR 0x6c
> #define DSI_GEN_PLD_DATA 0x70
>
> @@ -257,7 +203,11 @@ struct dw_mipi_dsi {
> struct regmap_field *field_dpi_vsync_active_low;
> struct regmap_field *field_dpi_hsync_active_low;
> struct regmap_field *field_cmd_mode_ack_rqst_en;
> - struct regmap_field *field_cmd_mode_all_lp_en;
> + struct regmap_field *field_cmd_mode_gen_sw_sr_en;
> + struct regmap_field *field_cmd_mode_dcs_sw_sr_en;
> + struct regmap_field *field_cmd_mode_gen_lw_en;
> + struct regmap_field *field_cmd_mode_dcs_lw_en;
> + struct regmap_field *field_cmd_mode_max_rd_pkt_size;
> struct regmap_field *field_cmd_mode_en;
> struct regmap_field *field_cmd_pkt_status;
> struct regmap_field *field_vid_mode_en;
> @@ -315,7 +265,11 @@ struct dw_mipi_dsi_variant {
> struct reg_field cfg_dpi_hsync_active_low;
> struct reg_field cfg_cmd_mode_en;
> struct reg_field cfg_cmd_mode_ack_rqst_en;
> - struct reg_field cfg_cmd_mode_all_lp_en;
> + struct reg_field cfg_cmd_mode_gen_sw_sr_en;
> + struct reg_field cfg_cmd_mode_dcs_sw_sr_en;
> + struct reg_field cfg_cmd_mode_gen_lw_en;
> + struct reg_field cfg_cmd_mode_dcs_lw_en;
> + struct reg_field cfg_cmd_mode_max_rd_pkt_size;
> struct reg_field cfg_cmd_pkt_status;
> struct reg_field cfg_vid_mode_en;
> struct reg_field cfg_vid_mode_type;
> @@ -366,7 +320,11 @@ static const struct dw_mipi_dsi_variant dw_mipi_dsi_v130_v131_layout = {
> .cfg_dpi_vsync_active_low = REG_FIELD(DSI_DPI_CFG_POL, 1, 1),
> .cfg_dpi_hsync_active_low = REG_FIELD(DSI_DPI_CFG_POL, 2, 2),
> .cfg_cmd_mode_ack_rqst_en = REG_FIELD(DSI_CMD_MODE_CFG, 1, 1),
> - .cfg_cmd_mode_all_lp_en = REG_FIELD(DSI_CMD_MODE_CFG, 8, 24),
> + .cfg_cmd_mode_gen_sw_sr_en = REG_FIELD(DSI_CMD_MODE_CFG, 8, 13),
> + .cfg_cmd_mode_gen_lw_en = REG_FIELD(DSI_CMD_MODE_CFG, 14, 14),
> + .cfg_cmd_mode_dcs_sw_sr_en = REG_FIELD(DSI_CMD_MODE_CFG, 16, 18),
> + .cfg_cmd_mode_dcs_lw_en = REG_FIELD(DSI_CMD_MODE_CFG, 19, 19),
> + .cfg_cmd_mode_max_rd_pkt_size = REG_FIELD(DSI_CMD_MODE_CFG, 24, 24),
> .cfg_cmd_mode_en = REG_FIELD(DSI_MODE_CFG, 0, 31),
> .cfg_cmd_pkt_status = REG_FIELD(DSI_CMD_PKT_STATUS, 0, 31),
> .cfg_vid_mode_en = REG_FIELD(DSI_MODE_CFG, 0, 31),
> @@ -418,7 +376,11 @@ static const struct dw_mipi_dsi_variant dw_mipi_dsi_v101_layout = {
> .cfg_dpi_vsync_active_low = REG_FIELD(DSI_DPI_CFG, 6, 6),
> .cfg_dpi_hsync_active_low = REG_FIELD(DSI_DPI_CFG, 7, 7),
> .cfg_cmd_mode_en = REG_FIELD(DSI_CMD_MODE_CFG_V101, 0, 0),
> - .cfg_cmd_mode_all_lp_en = REG_FIELD(DSI_CMD_MODE_CFG_V101, 1, 12),
> + .cfg_cmd_mode_gen_sw_sr_en = REG_FIELD(DSI_CMD_MODE_CFG, 1, 6),
> + .cfg_cmd_mode_dcs_sw_sr_en = REG_FIELD(DSI_CMD_MODE_CFG, 7, 9),
> + .cfg_cmd_mode_max_rd_pkt_size = REG_FIELD(DSI_CMD_MODE_CFG, 10, 10),
> + .cfg_cmd_mode_gen_lw_en = REG_FIELD(DSI_CMD_MODE_CFG, 11, 11),
> + .cfg_cmd_mode_dcs_lw_en = REG_FIELD(DSI_CMD_MODE_CFG, 12, 12),
> .cfg_cmd_mode_ack_rqst_en = REG_FIELD(DSI_CMD_MODE_CFG_V101, 13, 13),
> .cfg_cmd_pkt_status = REG_FIELD(DSI_CMD_PKT_STATUS_V101, 0, 14),
> .cfg_vid_mode_en = REG_FIELD(DSI_VID_MODE_CFG_V101, 0, 0),
> @@ -554,23 +516,18 @@ static void dw_mipi_message_config(struct dw_mipi_dsi *dsi,
> const struct mipi_dsi_msg *msg)
> {
> bool lpm = msg->flags & MIPI_DSI_MSG_USE_LPM;
> - u32 cmd_mode_lp = 0;
> -
> - switch (dsi->hw_version) {
> - case HWVER_130:
> - case HWVER_131:
> - cmd_mode_lp = CMD_MODE_ALL_LP;
> - break;
> - case HWVER_101:
> - cmd_mode_lp = CMD_MODE_ALL_LP_V101;
> - break;
> - }
>
> if (msg->flags & MIPI_DSI_MSG_REQ_ACK)
> regmap_field_write(dsi->field_cmd_mode_ack_rqst_en, 1);
>
> - if (lpm)
> - regmap_field_write(dsi->field_cmd_mode_all_lp_en, cmd_mode_lp);
> + if (lpm) {
> + regmap_field_write(dsi->field_cmd_mode_gen_sw_sr_en,
> + ENABLE_LOW_POWER);
> + regmap_field_write(dsi->field_cmd_mode_dcs_sw_sr_en, 7);
> + regmap_field_write(dsi->field_cmd_mode_gen_lw_en, 1);
> + regmap_field_write(dsi->field_cmd_mode_dcs_lw_en, 1);
> + regmap_field_write(dsi->field_cmd_mode_max_rd_pkt_size, 1);
> + }
>
> regmap_field_write(dsi->field_phy_txrequestclkhs, lpm ? 0 : 1);
> }
> @@ -1256,7 +1213,11 @@ static int dw_mipi_dsi_regmap_fields_init(struct dw_mipi_dsi *dsi)
> INIT_FIELD(dpi_vsync_active_low);
> INIT_FIELD(dpi_hsync_active_low);
> INIT_FIELD(cmd_mode_ack_rqst_en);
> - INIT_FIELD(cmd_mode_all_lp_en);
> + INIT_FIELD(cmd_mode_gen_sw_sr_en);
> + INIT_FIELD(cmd_mode_dcs_sw_sr_en);
> + INIT_FIELD(cmd_mode_gen_lw_en);
> + INIT_FIELD(cmd_mode_dcs_lw_en);
> + INIT_FIELD(cmd_mode_max_rd_pkt_size);
> INIT_FIELD(cmd_mode_en);
> INIT_FIELD(cmd_pkt_status);
> INIT_FIELD(vid_mode_en);
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