Kernel/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-01-09 06:43:09 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

interconnect: qcom: qcm2290: Update EBI channel configuration

Browse Source 
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>
Link: https://lore.kernel.org/r/20230726-topic-icc_coeff-v4-7-c04b60caa467@linaro.org
Signed-off-by: Georgi Djakov <djakov@kernel.org>
This commit is contained in:
Konrad Dybcio 2023-08-25 17:38:29 +02:00 committed by Georgi Djakov
parent 8657ed4711
commit 550064a85b
1 changed files with 2 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/interconnect/qcom/qcm2290.c
View File

@ -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,
};