From 7581beb6853f0050b55e2af34a59d01da077e570 Mon Sep 17 00:00:00 2001
From: Luben Tuikov <luben.tuikov@amd.com>
Date: Thu, 3 Jun 2021 23:58:19 -0400
Subject: drm/amdgpu: Use a single loop
Git-commit: e2e04041a25feff31faf5768caca2fef120209cb
Patch-mainline: v5.15-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
In smu_v11_0_i2c_transmit() use a single loop to
transmit bytes, instead of two nested loops.
Cc: Alexander Deucher <Alexander.Deucher@amd.com>
Cc: Andrey Grodzovsky <Andrey.Grodzovsky@amd.com>
Signed-off-by: Luben Tuikov <luben.tuikov@amd.com>
Reviewed-by: Alexander Deucher <Alexander.Deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c | 72 ++++++++++------------
1 file changed, 34 insertions(+), 38 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c b/drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c
index 7f48ee020bc0..751ea2517c43 100644
--- a/drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c
+++ b/drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c
@@ -243,49 +243,45 @@ static uint32_t smu_v11_0_i2c_transmit(struct i2c_adapter *control,
/* Clear status bits */
smu_v11_0_i2c_clear_status(control);
-
timeout_counter = jiffies + msecs_to_jiffies(20);
while (numbytes > 0) {
reg = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_STATUS);
- if (REG_GET_FIELD(reg, CKSVII2C_IC_STATUS, TFNF)) {
- do {
- reg = REG_SET_FIELD(reg, CKSVII2C_IC_DATA_CMD, DAT, data[bytes_sent]);
-
- /* Final message, final byte, must
- * generate a STOP, to release the
- * bus, i.e. don't hold SCL low.
- */
- if (numbytes == 1 && i2c_flag & I2C_M_STOP)
- reg = REG_SET_FIELD(reg,
- CKSVII2C_IC_DATA_CMD,
- STOP, 1);
-
- if (bytes_sent == 0 && i2c_flag & I2C_X_RESTART)
- reg = REG_SET_FIELD(reg,
- CKSVII2C_IC_DATA_CMD,
- RESTART, 1);
-
- /* Write */
- reg = REG_SET_FIELD(reg, CKSVII2C_IC_DATA_CMD, CMD, 0);
- WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_DATA_CMD, reg);
-
- /* Record that the bytes were transmitted */
- bytes_sent++;
- numbytes--;
-
- reg = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_STATUS);
-
- } while (numbytes && REG_GET_FIELD(reg, CKSVII2C_IC_STATUS, TFNF));
- }
+ if (!REG_GET_FIELD(reg, CKSVII2C_IC_STATUS, TFNF)) {
+ /*
+ * We waited for too long for the transmission
+ * FIFO to become not-full. Exit the loop
+ * with error.
+ */
+ if (time_after(jiffies, timeout_counter)) {
+ ret |= I2C_SW_TIMEOUT;
+ goto Err;
+ }
+ } else {
+ reg = REG_SET_FIELD(reg, CKSVII2C_IC_DATA_CMD, DAT,
+ data[bytes_sent]);
- /*
- * We waited too long for the transmission FIFO to become not-full.
- * Exit the loop with error.
- */
- if (time_after(jiffies, timeout_counter)) {
- ret |= I2C_SW_TIMEOUT;
- goto Err;
+ /* Final message, final byte, must generate a
+ * STOP to release the bus, i.e. don't hold
+ * SCL low.
+ */
+ if (numbytes == 1 && i2c_flag & I2C_M_STOP)
+ reg = REG_SET_FIELD(reg,
+ CKSVII2C_IC_DATA_CMD,
+ STOP, 1);
+
+ if (bytes_sent == 0 && i2c_flag & I2C_X_RESTART)
+ reg = REG_SET_FIELD(reg,
+ CKSVII2C_IC_DATA_CMD,
+ RESTART, 1);
+
+ /* Write */
+ reg = REG_SET_FIELD(reg, CKSVII2C_IC_DATA_CMD, CMD, 0);
+ WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_DATA_CMD, reg);
+
+ /* Record that the bytes were transmitted */
+ bytes_sent++;
+ numbytes--;
}
}
--
2.38.1