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Message-ID: <20250620093104.2016196-7-shiyongbang@huawei.com>
Date: Fri, 20 Jun 2025 17:31:00 +0800
From: Yongbang Shi <shiyongbang@...wei.com>
To: <xinliang.liu@...aro.org>, <tiantao6@...ilicon.com>,
<maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
<tzimmermann@...e.de>, <airlied@...il.com>, <daniel@...ll.ch>,
<kong.kongxinwei@...ilicon.com>, <dmitry.baryshkov@....qualcomm.com>
CC: <liangjian010@...wei.com>, <chenjianmin@...wei.com>,
<lidongming5@...wei.com>, <shiyongbang@...wei.com>, <libaihan@...wei.com>,
<shenjian15@...wei.com>, <shaojijie@...wei.com>,
<jani.nikula@...ux.intel.com>, <dri-devel@...ts.freedesktop.org>,
<linux-kernel@...r.kernel.org>
Subject: [PATCH v2 drm-dp 06/10] drm/hisilicon/hibmc: add dp mode valid check
From: Baihan Li <libaihan@...wei.com>
If DP is connected, add mode check and BW check in mode_valid_ctx() to
ensure DP's cfg is usable.
Fixes: f9698f802e50 ("drm/hisilicon/hibmc: Restructuring the header dp_reg.h")
Signed-off-by: Baihan Li <libaihan@...wei.com>
Signed-off-by: Yongbang Shi <shiyongbang@...wei.com>
---
ChangeLog:
v1 -> v2:
- delete if (!dp->is_connected) in hibmc_dp_mode_valid(), suggested by Dmitry Baryshkov.
---
drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c | 10 ++++
drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.h | 6 +++
.../gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c | 51 +++++++++++++++++++
3 files changed, 67 insertions(+)
diff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c
index 98cc534ba794..5b1f943b601c 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c
@@ -273,6 +273,16 @@ void hibmc_dp_reset_link(struct hibmc_dp *dp)
dp->dp_dev->link.status.channel_equalized = false;
}
+u8 hibmc_dp_get_link_rate(struct hibmc_dp *dp)
+{
+ return dp->dp_dev->link.cap.link_rate;
+}
+
+u8 hibmc_dp_get_lanes(struct hibmc_dp *dp)
+{
+ return dp->dp_dev->link.cap.lanes;
+}
+
static const struct hibmc_dp_color_raw g_rgb_raw[] = {
{CBAR_COLOR_BAR, 0x000, 0x000, 0x000},
{CBAR_WHITE, 0xfff, 0xfff, 0xfff},
diff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.h b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.h
index 9b45e88e47e4..0059a2648a38 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.h
+++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.h
@@ -12,6 +12,10 @@
#include <drm/drm_print.h>
#include <drm/display/drm_dp_helper.h>
+/* 27 * 10000000 * 80% = 216000000 */
+#define DP_MODE_VALI_CAL 216000000
+#define BPP_24 24
+
struct hibmc_dp_dev;
enum hibmc_dp_cbar_pattern {
@@ -62,5 +66,7 @@ void hibmc_dp_reset_link(struct hibmc_dp *dp);
void hibmc_dp_hpd_cfg(struct hibmc_dp *dp);
void hibmc_dp_enable_int(struct hibmc_dp *dp);
void hibmc_dp_disable_int(struct hibmc_dp *dp);
+u8 hibmc_dp_get_link_rate(struct hibmc_dp *dp);
+u8 hibmc_dp_get_lanes(struct hibmc_dp *dp);
#endif
diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c
index c0de796225b7..40f95880b278 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c
@@ -15,6 +15,28 @@
#define DP_MASKED_SINK_HPD_PLUG_INT BIT(2)
+struct hibmc_dp_disp_clk {
+ u16 hdisplay;
+ u16 vdisplay;
+ u32 clock;
+};
+
+static const struct hibmc_dp_disp_clk hibmc_dp_clk_table[] = {
+ {640, 480, 25175}, /* 25175 khz */
+ {800, 600, 40000}, /* 40000 khz */
+ {1024, 768, 65000}, /* 65000 khz */
+ {1152, 864, 80000}, /* 80000 khz */
+ {1280, 768, 79500}, /* 79500 khz */
+ {1280, 720, 74250}, /* 74250 khz */
+ {1280, 960, 108000}, /* 108000 khz */
+ {1280, 1024, 108000}, /* 108000 khz */
+ {1440, 900, 106500}, /* 106500 khz */
+ {1600, 900, 108000}, /* 108000 khz */
+ {1600, 1200, 162000}, /* 162000 khz */
+ {1920, 1080, 148500}, /* 148500 khz */
+ {1920, 1200, 193250}, /* 193250 khz */
+};
+
static int hibmc_dp_connector_get_modes(struct drm_connector *connector)
{
const struct drm_edid *drm_edid;
@@ -49,9 +71,38 @@ static int hibmc_dp_detect(struct drm_connector *connector,
return connector_status_disconnected;
}
+static int hibmc_dp_mode_valid(struct drm_connector *connector,
+ const struct drm_display_mode *mode,
+ struct drm_modeset_acquire_ctx *ctx,
+ enum drm_mode_status *status)
+{
+ struct hibmc_dp *dp = to_hibmc_dp(connector);
+ u64 cur_val, max_val;
+
+ /* check DP link BW */
+ cur_val = (u64)mode->htotal * mode->vtotal * drm_mode_vrefresh(mode) * BPP_24;
+ max_val = (u64)hibmc_dp_get_link_rate(dp) * DP_MODE_VALI_CAL * hibmc_dp_get_lanes(dp);
+
+ *status = cur_val > max_val ? MODE_CLOCK_HIGH : MODE_OK;
+
+ /* check the clock */
+ for (size_t i = 0; i < ARRAY_SIZE(hibmc_dp_clk_table); i++) {
+ if (hibmc_dp_clk_table[i].hdisplay == mode->hdisplay &&
+ hibmc_dp_clk_table[i].vdisplay == mode->vdisplay) {
+ if (hibmc_dp_clk_table[i].clock != mode->clock) {
+ *status = MODE_CLOCK_RANGE;
+ return 0;
+ }
+ }
+ }
+
+ return 0;
+}
+
static const struct drm_connector_helper_funcs hibmc_dp_conn_helper_funcs = {
.get_modes = hibmc_dp_connector_get_modes,
.detect_ctx = hibmc_dp_detect,
+ .mode_valid_ctx = hibmc_dp_mode_valid,
};
static int hibmc_dp_late_register(struct drm_connector *connector)
--
2.33.0
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