mirrors/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-02-26 12:16:05 -05:00
Code Issues Packages Projects Releases Wiki Activity

drm: zynqmp_dp: Use AUX IRQs instead of polling

Browse Source 
Instead of polling the status register for the AUX status, just enable
the IRQs and signal a completion.

Signed-off-by: Sean Anderson <sean.anderson@linux.dev>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240809193600.3360015-6-sean.anderson@linux.dev
This commit is contained in:
Sean Anderson
2024-08-09 15:35:57 -04:00
committed by Tomi Valkeinen
parent 948a944ea7
commit 2425dee876
1 changed files with 25 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
drivers/gpu/drm/xlnx/zynqmp_dp.c
View File

@@ -286,6 +286,7 @@ struct zynqmp_dp_config {
* @next_bridge: The downstream bridge
* @config: IP core configuration from DTS
* @aux: aux channel
* @aux_done: Completed when we get an AUX reply or timeout
* @phy: PHY handles for DP lanes
* @num_lanes: number of enabled phy lanes
* @hpd_work: hot plug detection worker
@@ -306,6 +307,7 @@ struct zynqmp_dp {
struct drm_bridge bridge;
struct work_struct hpd_work;
struct work_struct hpd_irq_work;
struct completion aux_done;
struct mutex lock;
struct drm_bridge *next_bridge;
@@ -942,12 +944,15 @@ static int zynqmp_dp_aux_cmd_submit(struct zynqmp_dp *dp, u32 cmd, u16 addr,
u8 *buf, u8 bytes, u8 *reply)
{
bool is_read = (cmd & AUX_READ_BIT) ? true : false;
unsigned long time_left;
u32 reg, i;
reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE);
if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REQUEST)
return -EBUSY;
reinit_completion(&dp->aux_done);
zynqmp_dp_write(dp, ZYNQMP_DP_AUX_ADDRESS, addr);
if (!is_read)
for (i = 0; i < bytes; i++)
@@ -962,17 +967,14 @@ static int zynqmp_dp_aux_cmd_submit(struct zynqmp_dp *dp, u32 cmd, u16 addr,
zynqmp_dp_write(dp, ZYNQMP_DP_AUX_COMMAND, reg);
/* Wait for reply to be delivered upto 2ms */
for (i = 0; ; i++) {
reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE);
if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY)
break;
time_left = wait_for_completion_timeout(&dp->aux_done,
msecs_to_jiffies(2));
if (!time_left)
return -ETIMEDOUT;
if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT ||
i == 2)
return -ETIMEDOUT;
usleep_range(1000, 1100);
}
reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE);
if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT)
return -ETIMEDOUT;
reg = zynqmp_dp_read(dp, ZYNQMP_DP_AUX_REPLY_CODE);
if (reply)
@@ -1056,6 +1058,9 @@ static int zynqmp_dp_aux_init(struct zynqmp_dp *dp)
(w << ZYNQMP_DP_AUX_CLK_DIVIDER_AUX_FILTER_SHIFT) |
(rate / (1000 * 1000)));
zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_REPLY_RECEIVED |
ZYNQMP_DP_INT_REPLY_TIMEOUT);
dp->aux.name = "ZynqMP DP AUX";
dp->aux.dev = dp->dev;
dp->aux.drm_dev = dp->bridge.dev;
@@ -1073,6 +1078,9 @@ static int zynqmp_dp_aux_init(struct zynqmp_dp *dp)
static void zynqmp_dp_aux_cleanup(struct zynqmp_dp *dp)
{
drm_dp_aux_unregister(&dp->aux);
zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_REPLY_RECEIVED |
ZYNQMP_DP_INT_REPLY_TIMEOUT);
}
/* -----------------------------------------------------------------------------
@@ -1730,6 +1738,12 @@ static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data)
if (status & ZYNQMP_DP_INT_HPD_IRQ)
schedule_work(&dp->hpd_irq_work);
if (status & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY)
complete(&dp->aux_done);
if (status & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT)
complete(&dp->aux_done);
return IRQ_HANDLED;
}
@@ -1753,6 +1767,7 @@ int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub)
dp->dpsub = dpsub;
dp->status = connector_status_disconnected;
mutex_init(&dp->lock);
init_completion(&dp->aux_done);
INIT_WORK(&dp->hpd_work, zynqmp_dp_hpd_work_func);
INIT_WORK(&dp->hpd_irq_work, zynqmp_dp_hpd_irq_work_func);