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[v2,07/10] interconnect: qcom: qcm2290: Update EBI channel configuration

Message ID 20230726-topic-icc_coeff-v2-7-8c91c6c76076@linaro.org
State Superseded
Headers show
Series Fix up icc clock rate calculation on some platforms | expand

Commit Message

Konrad Dybcio July 31, 2023, 10:52 a.m. UTC 
QCM2290 can support two memory configurations: single-channel, 32-bit
wide LPDDR3 @ up to 933MHz (bus clock) or dual-channel, 16-bit wide
LPDDR4X @ up to 1804 MHz. The interconnect driver in its current form
seems to gravitate towards the first one, however there are no LPDDR3-
equipped boards upstream and we still don't have a great way to discern
the DDR generations on the kernel side.

To make DDR scaling possible on the only currently-supported 2290
board, stick with the LPDDR4X config by default. The side effect on any
potential LPDDR3 board would be that the requested bus clock rate is
too high (but still capped to the firmware-configured FMAX).

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
---
 drivers/interconnect/qcom/qcm2290.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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Patch

diff --git a/drivers/interconnect/qcom/qcm2290.c b/drivers/interconnect/qcom/qcm2290.c
index 42fa01c66e73..3bd7ad67c569 100644
--- a/drivers/interconnect/qcom/qcm2290.c
+++ b/drivers/interconnect/qcom/qcm2290.c
@@ -678,7 +678,8 @@  static struct qcom_icc_node mas_gfx3d = {
 static struct qcom_icc_node slv_ebi1 = {
 	.name = "slv_ebi1",
 	.id = QCM2290_SLAVE_EBI1,
-	.buswidth = 8,
+	.buswidth = 4,
+	.channels = 2,
 	.mas_rpm_id = -1,
 	.slv_rpm_id = 0,
 };