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authorBhaumik Bhatt <bbhatt@codeaurora.org>2021-04-02 00:16:15 +0300
committerManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>2021-04-07 09:55:42 +0300
commit47705c08465931923e2f2b506986ca0bdf80380d (patch)
tree101c75b3df743191dabc447e60686660c8701fd8 /drivers/bus
parent73b7aebcc8cbc2cddfb34be9840542807ad61044 (diff)
downloadlinux-47705c08465931923e2f2b506986ca0bdf80380d.tar.xz
bus: mhi: core: Clear configuration from channel context during reset
When clearing up the channel context after client drivers are done using channels, the configuration is currently not being reset entirely. Ensure this is done to appropriately handle issues where clients unaware of the context state end up calling functions which expect a context. Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org> Reviewed-by: Hemant Kumar <hemantk@codeaurora.org> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Link: https://lore.kernel.org/r/1617311778-1254-7-git-send-email-bbhatt@codeaurora.org Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Diffstat (limited to 'drivers/bus')
-rw-r--r--drivers/bus/mhi/core/init.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
index 0e54384e9fc5..c81b377fca8f 100644
--- a/drivers/bus/mhi/core/init.c
+++ b/drivers/bus/mhi/core/init.c
@@ -558,6 +558,7 @@ void mhi_deinit_chan_ctxt(struct mhi_controller *mhi_cntrl,
struct mhi_ring *buf_ring;
struct mhi_ring *tre_ring;
struct mhi_chan_ctxt *chan_ctxt;
+ u32 tmp;
buf_ring = &mhi_chan->buf_ring;
tre_ring = &mhi_chan->tre_ring;
@@ -571,7 +572,19 @@ void mhi_deinit_chan_ctxt(struct mhi_controller *mhi_cntrl,
vfree(buf_ring->base);
buf_ring->base = tre_ring->base = NULL;
+ tre_ring->ctxt_wp = NULL;
chan_ctxt->rbase = 0;
+ chan_ctxt->rlen = 0;
+ chan_ctxt->rp = 0;
+ chan_ctxt->wp = 0;
+
+ tmp = chan_ctxt->chcfg;
+ tmp &= ~CHAN_CTX_CHSTATE_MASK;
+ tmp |= (MHI_CH_STATE_DISABLED << CHAN_CTX_CHSTATE_SHIFT);
+ chan_ctxt->chcfg = tmp;
+
+ /* Update to all cores */
+ smp_wmb();
}
int mhi_init_chan_ctxt(struct mhi_controller *mhi_cntrl,